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Any proven turbo combinations out their for the 300?

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clintonvillian
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Any proven turbo combinations out their for the 300?

Post #1 by clintonvillian » Sun Feb 15, 2015 3:31 pm

Hoping to get some feedback on the guys actually running theirs. We all can play on calculators, but I'd like to hear more from the guys running them.

Specifically, make, model, configuration, and any performance issues, or recommendations you would have (internal vs external waste gate, A/R ratios, intercoolers, etc).




I am getting ready to get into the meat of my build, mounting the supercharger. I have done some price checking, and for the cost of a rebuild and port and polish job I can buy a new name brand turbo. So it is making me question the feasibility of the supercharger, I don't see any advantage to it over a turbo. I am not killing it yet, but definitely looking at options. That price is not including a custom crank pulley, idler pulley, and cost in fabbing up the mounts. It is a 1500.00 swing......

Sick6Turbo
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Re: Any proven turbo combinations out their for the 300?

Post #2 by Sick6Turbo » Mon Dec 21, 2015 2:01 pm

Here is my rolling test bed for a turbocharged 300...http://www.ford-trucks.com/forums/13936 ... st15578945

Joined this forum a few days ago, looks like a ton of 300 knowledge here.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

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bubba22349
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Re: Any proven turbo combinations out their for the 300?

Post #3 by bubba22349 » Tue Dec 22, 2015 12:14 am

:beer: wow that's a nice pickup!
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

Sick6Turbo
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Re: Any proven turbo combinations out their for the 300?

Post #4 by Sick6Turbo » Tue Dec 22, 2015 9:09 am

Thanks bubba22349! The pics help the looks a little...

Lots of info in there, 3 different cams, 2 different turbos, with all the details along the way.

Here is a shortcut to all the videos in the thread: https://www.youtube.com/channel/UCh21RL ... _as=public

I wanted to start my build thread here, but had issues trying to register, I think on my end. Would like to start a condensed/up to date thread here. Which area would be the best?
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

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bubba22349
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Re: Any proven turbo combinations out their for the 300?

Post #5 by bubba22349 » Tue Dec 22, 2015 12:54 pm

Well you could post it in the Turbo section or the 240 / 300 big six forum or even both. The big six section would likely get more views, but there is a very dedicated 300 six group also in the turbo section. Good luck :nod:
A bad day Drag Racing is still better than a good day at work!

I am still hunting for a project car to build but with my current low budget it's not looking so good. My Ex- Fleet of Sixes these are all long gone! :bang: 1954 Customline 223 3 speed with O/D, 1963 Fairlane project drag car with BB6, 1977 Maverick 250 with C4, 1994 F-150 a 300 with 5 speed.

Sick6Turbo
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Re: Any proven turbo combinations out their for the 300?

Post #6 by Sick6Turbo » Tue Dec 22, 2015 2:57 pm

Thank you, I posted here in the turbo section.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

MECH_E
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Re: Any proven turbo combinations out their for the 300?

Post #7 by MECH_E » Mon Dec 28, 2015 12:00 pm

While I've not played with cams yet, my Holset HX35 is doing well for my needs, which is a used turbo off a mid to late 90's Dodge Cummins. They are very affordable and can be easily rebuilt with new bearings and seals for under $50. Depending on your boost goals, the "Chinacharger" Ebay turbos are actually not terrible. As long as you dont plan over 20psi of boost, they last long enough and are dirt cheap. Thats all in what you like though, I completely understand if you just don't want to mess around with cheap parts.

My completely stock 95 motor spools around 2500 rpm with an exhaust leak at the flange.

Sick6Turbo
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Re: Any proven turbo combinations out their for the 300?

Post #8 by Sick6Turbo » Thu Dec 31, 2015 10:39 am

:nod: Stock 300+hx35= 2500 rpm spool, 3000 rpm grinometer pegged.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

mekta3
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Re: Any proven turbo combinations out their for the 300?

Post #9 by mekta3 » Mon Jan 04, 2016 12:26 am

Hey sick6turbo, what did exact Holley did you use? Was it modified? I don't understand the tuning that goes into turbo carbs. Would a high volume electric feed too a single feed 600cfm accomodate a lower psi like 15?

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Re: Any proven turbo combinations out their for the 300?

Post #10 by MECH_E » Mon Jan 04, 2016 9:07 am

Sick6Turbo wrote::nod: Stock 300+hx35= 2500 rpm spool, 3000 rpm grinometer pegged.


^Exactly, now I just need more boost and posi.

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Re: Any proven turbo combinations out their for the 300?

Post #11 by Sick6Turbo » Mon Jan 04, 2016 9:42 am

mekta3 wrote:Hey sick6turbo, what did exact Holley did you use? Was it modified? I don't understand the tuning that goes into turbo carbs. Would a high volume electric feed too a single feed 600cfm accomodate a lower psi like 15?


Holley 4776

Mods: Machine all surfaces. Holleys are very crooked. Don't worry about the fuel bowl sealing bead, machine it/them flat.

Solids floats,(e85 metering blocks, not necessary with gas), external power valve control using the Cure.

Tune idle and main jets same as n.a., and tune pvrc (power valve restrictor channels) during boost.

Good links to cover the basics: http://members.tccoa.com/392bird/tuning.htm

http://members.tccoa.com/392bird/carbtech.htm

High pressure such as efi fuel pumps with return style regulators such as Mallory 4309 is the best way. Some lower boost applications (typically 10 psi and lower)can get away with boost referencing the stock mechanical fuel pump, to increase fuel pressure 1:1 with boost.

Ran a stock 300-6/hx35 turbo with a holley 350 2v, solid float, pvrc drilled out one step at a time as needed, and referenced the stock mechanical fuel pump= (pressure line from the hat to the fuel pump vent, plugging the other fuel pump vent to seal.) "8.5" power valve. Ran 13 psi on that for a long time. Sometimes when shifting into 4th gear, when the rpms and flow were low and hat pressure was high, it would partially shut the power valve and go lean while boosted. A higher number power valve such as a "10.5" with a stronger spring would have helped, but possibly dump fuel too soon for n.a. driving. So, the Cure was developed to tune the carb for good n.a. driving, and guarantee the power valve would stay wide open while boosted.

viewtopic.php?f=22&t=74210 (I'm sure you have read this already)
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

gassercoupe
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Re: Any proven turbo combinations out their for the 300?

Post #12 by gassercoupe » Thu Jan 07, 2016 1:42 pm

Hey Sick6turbo,

At what rpm are you starting to get boost at and then at what rpm are you at max boost.

Thanks

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Re: Any proven turbo combinations out their for the 300?

Post #13 by Sick6Turbo » Thu Jan 07, 2016 5:40 pm

With the gt45 turbo and Crower 284, on the transbrake, I had 1psi@3100, 2psi@3200, 3psi@3300 ect... It's a 3000-3100 stall and as boost rose, increasing tq, the stall rose with it. The turbo spools or really takes off at 3800. There is so much tq that the rpms and boost shoot up to 5000 and 20psi respectfully right now as seen in the vids. I would guess 4500-4700 full boost. With the big turbine housing is has a wide range. With the t72 turbo, it started making boost at 2800 and full boost at 3200 when I had the other converter in there.

Now with the Lunati 277 and gt45, It spools a bit quicker and a little lower rpm. When the converter is warm and on the transbrake, boost and rpm come up fast enough that I can't pinpoint when it spools. Will have to get a video camera mounted in there.

In a nutshell:
1psi@3100
spools@3800
full boost@4500-4700
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

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Re: Any proven turbo combinations out their for the 300?

Post #14 by gassercoupe » Thu Jan 07, 2016 6:24 pm

Your installation is so befitting a truck that it has me thinking about doing the same.
Mine is stock except for intake and headers and I was thinking of using a Holset HX35Y turbo.
I have a water injection system that I got on trade so I'll be using it also in an under the carb plate.

All just stuff to think about for now, since I really need to put a new floor in my boat for spring Tarpon season.

Thanks

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Re: Any proven turbo combinations out their for the 300?

Post #15 by Sick6Turbo » Thu Jan 07, 2016 6:44 pm

You bet! Hx35 and stock 300 seem to be a good fit, with the turbo being relatively transparent in normal driving until called upon. :thumbup:

I should also add, that going from the t72 to the bigger gt45 honestly only increased power by 5-10hp. Nothing to write home about. The engine did feel much smoother and more free however.

There is a guy that dyno tested different turbine a/r housings on the same turbo, same car. From a housing that choked the engine at 6000 (.68)to a housing that let it make power to 6800 rpm (.96), it gained only 16 rwhp. Tq numbers were higher on the smaller a/r, and he said it was a lot more fun on the street.

I have been seeking the lowest back pressure I can with the limited stock 300 head, it does make a little more power, less heat, more possibilities of exhaust scavenging and camshafts with more overlap @.050.

However, there is also a guy with built 363 sbf with 25psi boost making 1100hp (dyno) with a turbine housing and wheel smaller than the gt45 but more effecient (Precision 76/75). The class he races limits him to that size turbo, single turbo only. It takes 1.15 seconds from fast idle to make 25psi! Serious back pressure and I bet his .680 lift solid roller has plenty of overlap @.050 even with a wide lsa.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

pmuller9
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Re: Any proven turbo combinations out their for the 300?

Post #16 by pmuller9 » Thu Jan 07, 2016 10:54 pm

Sick6Turbo wrote:You bet! Hx35 and stock 300 seem to be a good fit, with the turbo being relatively transparent in normal driving until called upon. :thumbup:

I should also add, that going from the t72 to the bigger gt45 honestly only increased power by 5-10hp. Nothing to write home about. The engine did feel much smoother and more free however.

There is a guy that dyno tested different turbine a/r housings on the same turbo, same car. From a housing that choked the engine at 6000 (.68)to a housing that let it make power to 6800 rpm (.96), it gained only 16 rwhp. Tq numbers were higher on the smaller a/r, and he said it was a lot more fun on the street.

I have been seeking the lowest back pressure I can with the limited stock 300 head, it does make a little more power, less heat, more possibilities of exhaust scavenging and camshafts with more overlap @.050.

However, there is also a guy with built 363 sbf with 25psi boost making 1100hp (dyno) with a turbine housing and wheel smaller than the gt45 but more effecient (Precision 76/75). The class he races limits him to that size turbo, single turbo only. It takes 1.15 seconds from fast idle to make 25psi! Serious back pressure and I bet his .680 lift solid roller has plenty of overlap @.050 even with a wide lsa.


On a log exhaust manifold the exhaust strokes are 120 degrees apart. Instead of scavenging, you have exhaust pressure pulses pressurizing the next cylinder in the firing order before the exhaust valve closes.
The front 3 cylinders need to be isolated from the back 3 cylinders giving 240 degrees separation between exhaust pressure pulses in the manifold. Far less cylinder to cylinder interaction.

We made 2000+ hp with a 430 SBF with twin precision 88s at 8000 rpm. 25 lbs of boost
Cam .050" durations in the 260s with lifts over .900". Lots of overlap by virtue of the lobe duration needed to get the rpm, not by choice.
A/R over 1.0. Average exhaust pressure the same as boost pressure.
2 seconds from fast idle to the foot break limiter coming into the lights and another 2 seconds on transbrake to launch boost.
Last edited by pmuller9 on Fri Jan 08, 2016 6:35 pm, edited 2 times in total.

deere114
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Re: Any proven turbo combinations out their for the 300?

Post #17 by deere114 » Fri Jan 08, 2016 7:29 am

I've wondered how the stock efi exhausts manifolds with dual 2" pipe all the way back to a divided entry turbo would perform compared to the 6-1 log and single 2.5" pipe. I was going to built a tubular split scroll turbo header for the tp38 front mount I'm building. But after realizing it's the front 3 and back 3 cylinders I have to pair, it's going to be way easier for me and cheaper to keep my efi manifolds and run to short 2" up pipes to a t4 flange for my turbo. Still technically twin scroll though not come rely tubular. We'll see how it works out for me I'm trying to get the quickest spool out of that big exhaust wheel. Already purchased a .84 ar housing which is the smallest available

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Re: Any proven turbo combinations out their for the 300?

Post #18 by gassercoupe » Fri Jan 08, 2016 4:32 pm

Well I'm keeping my headers only because they were such a pain to put on in the first place.
Need 6 arms for some jobs and I'm a little short.

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Re: Any proven turbo combinations out their for the 300?

Post #19 by sthorvictor » Fri Jan 15, 2016 1:39 pm

just came across your thread sorry its a bit late. efi manifolds with a merging y pipe, ran a gt35 (ebay turbo) t4 .68ar housing 3"vband, positive pressure around 1800rpm all in 15psi+ 22-2500 rpm pending on load, found the turbine to be too small for highway cruising awesome towing and torque for 4x4, too much backpressure pipes start glowing at 115-120kph, with that same turbo i was going to run a .81/.82 ar turbine housing.. however i went to a larger turbo and housing for kicks recently, t76 t4 .96ar turbine 3"vband, positive pressure around 2000 rpm, full 15lbs 2800rpm-3000rpm, smooth transition, makes nearly the same bottom end as the old turbo just a bit slower/smoother coming on, as far as street ability i like it better even though it spools later. also find the top end has picked up drastically. hoping with a cam swap to utilize the head work, should make this think work better down low, was going to go to a .82 ar on the new turbo but im really starting to like how it comes on, you dont realize how much its pulling until you let off, also quieter and more discreet on the compressor side. the gt35 would constantly have a turbo wine if your into that sort of thing, also spooled violently quick down low, top end choke out/stop pulling hard around 4000-4500rpm but would carry on to 5k if you held it.
Best of luck,

Seth

turbocharged maf 300 f150

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Re: Any proven turbo combinations out their for the 300?

Post #20 by FuzzySix » Thu Jan 28, 2016 7:45 pm

Sick6Turbo wrote: :nod: Stock 300+hx35= 2500 rpm spool, 3000 rpm grinometer pegged.


I'm interested in a stock 300-turbo build. Any more info on your setup? How much boost do you get? How does it perform at interstate speeds (60-70mph)? And what else did you put in with it (injectors, blow off, intercooler, etc.)
95 F150 4.9 l6 EFI

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Re: Any proven turbo combinations out their for the 300?

Post #21 by sthorvictor » Sat Feb 13, 2016 2:10 pm

FuzzySix wrote:
Sick6Turbo wrote: :nod: Stock 300+hx35= 2500 rpm spool, 3000 rpm grinometer pegged.


I'm interested in a stock 300-turbo build. Any more info on your setup? How much boost do you get? How does it perform at interstate speeds (60-70mph)? And what else did you put in with it (injectors, blow off, intercooler, etc.)


think Sick6Turbo took a break from the forums,
Best of luck,

Seth

turbocharged maf 300 f150

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Re: Any proven turbo combinations out their for the 300?

Post #22 by Sick6Turbo » Tue Feb 16, 2016 4:12 pm

pmuller9: I agree, the log is doing zip for scavenging. The long 2.5" pipe downstream is the real aid, not sure if a 2.5" pipe that is shorter (ie front mount) would have as good of velocity, may have to be tapered down to a smaller pipe. I would like your thoughts on header size and length, and feed tube size for a front mount deal with 100% isolation. Front 3 cylinders and back 3 cylinders with individual pipes feeding into a twin scroll turbine with single isolated wastegate. (divider up against the wastegate valve head)

The previous examples of the 363 sbf etc. were just to show that things that people say will not work, can and do work. Optimum? No way. I am content doing this "junkyard" style to see what works, and how things respond. I'm leaving at least 10hp on the table in trade for great spool right now and some hp in other areas. I'm hoping to take my junkyard dog to the track this spring and run 11's at 475+hp. Then get a little fancy after that.

deere114: I have wondered the same thing as dual 2" would be the next step up vs single 2.5". A single (probably shorter) 2.5" pipe is said to support 900-1000hp with a big turbo tho. I know of a 6.0 ls with a 2" crossover well north of 700hp. Small pipes big turbo.

With the 2100 stall Edge converter, 268 comp cam, half of the t72 exhaust scroll blocked with a plate,(3/4" hole drilled in the blocked side) I was able to get 10 psi of boost at 2100 rpm. Let off the transbrake and boy what a dog. Had to lay into it very slow to avoid backfires through the carb. As soon as the tach hit 2400, SEE YA! That's the rpm the H.D. log and a 2.5" x 13'+ pipe works on a 300. Any of the 3 cams I tried made no difference. Even tho I switched to the 3100 stall converter after the Crower, there is a rpm hesitation at 2400 rpm always. Perhaps the efi mani's or headers would provide the lower rpm scavenging to get over the hump...when exhaust pressure is much higher than the boost. The reason my system doesn't work below 2400 is because at the 10psi@2100 senario, the exhaust pressure was 24psi, and the boost 10 psi and no scavenging is happening...reversion. Above 2400, good to go. Maybe a single 2" or 2.25" feed pipe would work with the log and rear mount at a lower rpm.

FuzzySix: Ran 13psi non intercooled 14* total timing 87 octane dual port intake open spacer Holley 350 2 barrel ebay wastegate. Only abused, never cruised. He pinged it plenty shifting into 4th and boosting with big tires on it, that's why I developed the Cure to hold the power valve open during low cfm/rpm, high boost senarios. Beat the heck out of it tuning on my back road, then he beat up stock mustangs and camaros in town stop light to stop light (4wd). From there he tried to kill it just doing mud bogs (floating the valves for a rev limiter), and blew up a clutch and snapped axle shafts/joints. No injectors or anything fancy, stock mechanical fuel pump boost referenced. Had a broken piston skirt when I installed the turbo, and ran fine when he went 460.

sthorvictor: Glad to see your build coming along nicely. I have been laying low, just too much time on the puter being on 4 forums ect. I have being getting alot more things done vs talking about them lol. I will chime in from time to time, the next action will likely be on my youtube channel.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

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Re: Any proven turbo combinations out their for the 300?

Post #23 by deere114 » Tue Feb 16, 2016 10:10 pm

I just finished my megasquirt tonight and bought a 95 powerstroke f250 to drive daily. So I'll be starting a build thread very shortly. I think since downtime isn't an issue now I'm going to try to fabricate a tubular header out of stainless weld els going to the twin scroll turbine housing in using. Exactly as you posted single tial 38mm with its feed pipe divided up to it. I'm thinking 1 5/8 tubes. Mainly cause that what seems to work for an n/a header. Goal is to light that tp38 and quickly and efficiently as possible. Looking forward to a new video!

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Re: Any proven turbo combinations out their for the 300?

Post #24 by pmuller9 » Wed Feb 17, 2016 1:17 am

Sick6Turbo wrote:pmuller9: I agree, the log is doing zip for scavenging. The long 2.5" pipe downstream is the real aid, not sure if a 2.5" pipe that is shorter (ie front mount) would have as good of velocity, may have to be tapered down to a smaller pipe. I would like your thoughts on header size and length, and feed tube size for a front mount deal with 100% isolation. Front 3 cylinders and back 3 cylinders with individual pipes feeding into a twin scroll turbine with single isolated wastegate. (divider up against the wastegate valve head)

The previous examples of the 363 sbf etc. were just to show that things that people say will not work, can and do work. Optimum? No way. I am content doing this "junkyard" style to see what works, and how things respond. I'm leaving at least 10hp on the table in trade for great spool right now and some hp in other areas. I'm hoping to take my junkyard dog to the track this spring and run 11's at 475+hp. Then get a little fancy after that.

Glad to see you back!
I would use 1 5/8" primary tubes.
The exhaust ports on a CNC ported head I have here measure 1.70" by 1.25" with a rounded 1.82" diagonal.

Each port on a divided T4 flange is about 2" by 1.5". I'm thinking one end of a 2.5" round can be shaped into a rectangle to fit those dimensions.
Have each set of three primary tubes collected with a 2.5" round then reshaped for the divided T4 flange.

Primary tube length will probably be determined more by turbocharger location.
If the turbo is below the intake manifold then it would be a straight shot from the exhaust ports to the T4 flange.

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Re: Any proven turbo combinations out their for the 300?

Post #25 by Sick6Turbo » Wed Feb 17, 2016 2:53 pm

FuzzySix: On the mud bogger 300 we ran 11.0-11.2 afr's. When he would shift into 4th it would lean to 12.0+ afr's and ping(no Cure). The extra fuel is how we got away with 87 octane and no inter cooler. The extra fuel does hurt power however, but more boost is the frosting on the cake.

I have pushed things a bit last fall after installing the Lunati 277. Been running 87 octane and 17psi, with 15gph 80meth/20water mix spraying pre turbo...no issues. From my experience, I should safely be able to run 24psi with 91 octane and Torco. The 277 makes more power per pound of boost than the other cams, so I start low and work back up with each change. "Hooks on the street leaving at 12 psi" is going to be a tall order now with the 277.

deere114: Awesome! Should work well! 8)

pmuller9: Good to converse again Paul. Thank you for the insight. :thumbup:
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

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Re: Any proven turbo combinations out their for the 300?

Post #26 by sthorvictor » Fri Feb 19, 2016 4:12 pm

Finally Blew mine up was pulling hard 20psi @4k no issues, 94 octane with 10% ethanol. Wastegate line blew off spiked 25lbs and detonated/kicked once think she leaned out soo fast and my timing wasn't forgiving enough for that, took the ring lands out on cyl 4 and 5 I'm thinking.
Best of luck,

Seth

turbocharged maf 300 f150

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Re: Any proven turbo combinations out their for the 300?

Post #27 by RustyRedTurbo » Sun Mar 27, 2016 8:12 pm

sick6turbo,

Those are some pretty sweet boost numbers I just killed my 300 yesterday I have a draw through turbo set up on mine. I popped a ring land in cylinder four. I was reading your post a little ways back you say your running Torco and 80/20 water meth. I was running 91 pump and 30/70 water meth and 15 psi when I killed mine. So what's the secret potion of Torco and pump gas your running? What are your AFR without the meth/ and water? I would love to get some more power out of mine if I could stop blowing it up :bang:

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Re: Any proven turbo combinations out their for the 300?

Post #28 by Sick6Turbo » Fri Apr 22, 2016 10:23 pm

When the turbo is cool, the boost only comes up to about 14psi with the current boost controller setting. It dawned on me about 2 months ago that the meth switch is set at 15psi, so I was actually running 87 octane and 14psi a few times last fall...no issues, I've pulled the 300 apart since then. When warm it boosts to 17psi with meth coming in at 15psi, which is ok since 10psi to 17psi is milliseconds.

Anyway...I use 3.2oz/gallon of gas. With 91 it's supposed to be 101 octane. I was able to gain 6psi on a 2.3 ford turbo 4 cylinder with no other changes with this mix. Here's a rundown of detail that will keep you safe...I hope!!!

Top ring gap= .028" minimum (my stock 300 had about .031" when I pulled it apart)
Second gap= jury still out on this some say .002 more than top to eliminate ring flutter, some say a few thousands less. I just pulled apart a stock supercoupe 3.8 v6 and the top rings were around .034" and the second rings were .021", 100,xxx miles. Smaller bore and 11psi for the factory. Those are hyper's and sometimes require more top ring gap as well. I'm putting hypers in my engine now and will gap .028 top, .024 second. I will be putting some easy miles on it for a while tho, and slowly increasing boost over time.

14* max timing boosted. I know I will be running 20psi+ so I don't horse around with more timing. Set it at 14* and if issues arise along the way, no problem....hopefully.

AFR's stick around 11.5 ratio. Mine is rich at low boost because I over jet for high boost. Around 15 psi and above most carbs need more fuel. Instead of going crazy rich at low boost, I have the meth come in at 15psi to bridge the gap. It all about what the combo will tolerate as far as spooling vs max boost. I am high 10's afr first spooling and stays low 11's til around 15psi and starts to lean so that's when I bring in 15gph of 80 meth 20 water. I run the carb as rich as possible while in boost to become less dependent on the meth. When 20 psi and on meth, if I see a 12.0 afr, it's time to add more fuel. I feel 12.0 afr is quite risky however I have not had any issues with my combo.

I get away with a lot more than most 300 builds because of a bigger cam(lower dynamic compression) and loose converter that doesn't load the engine at peak torque. Peak tq is likely 3200-3500 rpm? and I don't make serious boost til 3800 rpm. It's neat that the more radical you get with bigger cam, bigger turbo, more meth, the safer you are, to some degree.

I would guess that the ring gap was too tight popping your land off, or lean detonation that can crack and break cast pistons without any damage to the top of the piston or spark plug.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

Sick6Turbo
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Posts: 78
Joined: Sat Dec 19, 2015 12:53 pm
Location: Almond, Wi.

Re: Any proven turbo combinations out their for the 300?

Post #29 by Sick6Turbo » Fri Apr 22, 2016 10:30 pm

Also, I am not familiar with higher boost draw through setups and issues they may or may not have.
Dale
79 F-100 turbocharged 300 rear mount 20 psi
Stock EFI bottom end, mild port carb head
12.44@106 1/4 mile in 2015

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