turbo update finally

[addo]

That looks great! I reckon the louvres will come in handy to let that BOV ring loud and clear.

Hey, Car Craft, where are you?

 

[69Falcon]

Nice pics! Have you considered replacing the elbow between the carb bonnet and the turbo with an air/liquid intercooler?

 

[hasa68mustang]

very nice, I also need to make a heat shield and clean up the compartment a bit...

 

[Twinscrew]

Kirk- That is one sweet engine compartment ya got there. Very clean install. I noticed the O2 sensor. Is that a wide band? Do you have it hooked up? If so what kind of readings are you seeing?

 

[kirkallen143]

Nice pics! Have you considered replacing the elbow between the carb bonnet and the turbo with an air/liquid intercooler?

Thank you! No sir, not going to run an intercooler. This bronco still see mud and rocks...big rocks. If you tune it right, no intercooler, some have seen 19 psi, Probably not for long though. Later.

Kirk

 

[Anonymous]

I have seen a lot of guys run a side-mount with an electric fan, some even with water spray nozzles. No one says you HAVE to have it in front.

Boost switch turns fan/water on.

 

[kirkallen143]

Kirk- That is one sweet engine compartment ya got there. Very clean install. I noticed the O2 sensor. Is that a wide band? Do you have it hooked up? If so what kind of readings are you seeing?

Sorry about the late reply, got caught up at work. Thank you for the kudos, and naw it is just a regular old cheapy Bosch single wire from AutoZoo, I think $7.00. Got an Auto Meter A/F ratio gauge to hook it to, right next too the vacuum/boost gauge. Have not hooked it up yet, though...that's coming and I'll keep y'all posted. Later

Kirk

 

[Anonymous]

A narrow band O2 isn't useful as a tuning aid, because they just don't read very far away from 14.7:1 (stoichiometric)

It'll very likely just stay on "rich" the entire time you are driving.

 

[Anonymous]

Hi - nice looking setup! I was curious to what carb/hat combo and what turbo you're using. Thanks!

 

[kirkallen143]

A narrow band O2 isn't useful as a tuning aid, because they just don't read very far away from 14.7:1 (stoichiometric)

It'll very likely just stay on "rich" the entire time you are driving.

I know, but it looks good under the dash..."presentation is everything."

Kirk
ps. reading plugs is the best way to go.

 

[kirkallen143]

Hi - nice looking setup! I was curious to what carb/hat combo and what turbo you're using. Thanks!

Thanks again, the hat is off of a '98 jeep cherokee limited w/ a V8 and underneath is a holley 4412 500cfm. All blown thru by a garrett t3 "super 60" w/ a .48 turbine housing. Later.

Kirk

 

[kirkallen143]

Well, upped the timing to 10-11 degrees initial, discarded the vacuum advance line, run the retard line off of the port side of vacuum under the carb and took it from there (although it sure did run good at 20 degrees initial). The vacuum at 10* read @ 16 Hg and at 20* initial is was up to 19 Hg. Trying to tune the carb burned my eyes and the plugs were pretty much black. I got a backfire/pop or two out of the exhuast side this time and now there's more of a hesitation/miss when I first hit the throttle. No noticeable carb pop/backfire right now after timing change, so I blipped the throttle again and this time it just died on me and that's where I stand (battery needed charge so could not start back up).
I plan on taking the jets down to 66 or 65 and going to try to up the pump nozzle to a .031 (to help the off line hesitation) and I plan on limiting the centrifical adv to half, to get more adv initial timing.
I want to run a pcv, too much oil vapors coming out of breather caps. I plan on using a pcv off of a turbo coupe, or turbo supra, inline with a one-way check valve for now. I've heard complications on this subject about pressure in crankcase, but aren't those engines running high boost levels? We will see...that all for now, adios.

Kirk

 

[Anonymous]

1) I plan on limiting the centrifical adv to half, to get more adv initial timing.

2) I plan on using a pcv off of a turbo coupe, ..I've heard complications on this subject about pressure in crankcase, but aren't those engines running high boost levels?

I just took the one stiffest spring off (there were two styles) and that worked great.

I did a test on these with a rubber tipped blow gun. I tested eight different ones, The one I use seals perfectly, no check valve needed.

 

[kirkallen143]

1) I plan on limiting the centrifical adv to half, to get more adv initial timing.

2) I plan on using a pcv off of a turbo coupe, ..I've heard complications on this subject about pressure in crankcase, but aren't those engines running high boost levels?

I just took the one stiffest spring off (there were two styles) and that worked great.

I did a test on these with a rubber tipped blow gun. I tested eight different ones, The one I use seals perfectly, no check valve needed.

Yes sir, already took off the one stiff spring and put a lighter one in it's place, so now have two different tension springs. On the pcv, found one for a turbo supra I am going to use and if it needs it later on, I will add a inline check-valve from W.W. Grainger (3-450 psi, @ $15.00). Later.

Kirk

 

[kirkallen143]

Ok, after some ignition issues I have been going thru (points arm kept grinding itself down due to rust, acting like an abrasive, on the upper dist. cam. Took two sets of points to find this one out.) I have put in the 66 jets from the 68 jets (which in real sizes are 0.069 down to 0.066). Still a little on the rich side, have not checked plugs yet, but I'll keep those jets to be on the safe side. The timing is set at 15* BTDC and running alot smoother. I still have that hesitation when you first blip the throttle, and have not changed out the squirter from 0.028 to the larger 0.031 to see if it will solve the problem.
On another note, IS THERE ONLY V8 TRANS. IN THE JUNKYARDS NOWADAYS???????????!!!!!!!!!!!!!!!!!! And they want an arm and both your legs for the thing. Thanks for the vent.
I'll keep y'all updated. Later.

Kirk
ps. sure do like that whine of the turbo.

 

[Anonymous]

Running 2.5" into a three chambered muffler w/ dual 2.5" out

any sound clips?

 

[kirkallen143]

Running 2.5" into a three chambered muffler w/ dual 2.5" out

any sound clips?

I am working on the exhaust as we speak, right now it is just the downpipe (not too loud in my opinion), and don't forget about my cross-over after the muffler...AGGIE, God help...I mean, love us. Running up to Brownwood Sat. to get a trans, sure hope it is worth the $75.00, better than around here (Houston).
Was @ 40 degrees F. last night, gassed the throttle twice and the motor fired right up, cold. A little rough at first with no choke, but after a couple of minutes it was good to go.
Later.

Kirk
ps. still working on the slight hesitation at first throttle, more timing, more fuel?

 

[Anonymous]

I am working on the exhaust as we speak, right now it is just the downpipe (not too loud in my opinion),

Oh, I see. The muffler will remove all turbo sounds.

ps. still working on the slight hesitation at first throttle, more timing, more fuel?

Little more fiddling of each? Really, the timing can be in a lot of places and still have no stumble...look to see if the parts of the accelerator pump are bad, not just shooter size.

 

[kirkallen143]

I am working on the exhaust as we speak, right now it is just the downpipe (not too loud in my opinion),

Oh, I see. The muffler will remove all turbo sounds.

ps. still working on the slight hesitation at first throttle, more timing, more fuel?

Little more fiddling of each? Really, the timing can be in a lot of places and still have no stumble...look to see if the parts of the accelerator pump are bad, not just shooter size.

Believe me, I can still hear that turbo whine and BOV let loose. At least it sounds better now than the "sick cummins diesel" like it used to.

I checked adjustment b/tw pump arm and spring-loaded actuator to 0.015 at WOT w/ pump arm pressed down, and diaphram is new. I installed the larger 0.031 squirter and bumped up timing to 15 BTDC w/ 0.066 jets and this took alot of the hesitation out, but there is still some. So I fabbed fitted the exhaust w/ muffler, nice low rumble and not too loud, kind of quiet actually in upper rpms, and reved it a couple of times. Nice smooth idle. The back pressure on the turbo, what was there from the muffler, seem to help again w/ the off throttle hesitation. So now I decided to change jets down to the 0.064's, just for the hell of it, and I like it there! Nice exhaust smell, not too rich like with the 0.068's, just right. Cleaned #1 plug and checked after idleing for @ 5 minutes w/ this setup and it came out clean, no tan or black or white. Do I need to idle longer or actually get it out on the road (Yeah, that would be nice)? Now some of the hesitation is back w/ the smaller jets. I am going to try larger squirters, somewhere in the range of 0.034 and another at 0.037 and see if there is some sort of balance. I will keep the timing at 15 BTDC, it's nice and smooth..."purrs like a kitten." I'll keep ya updated. Later.

Kirk

 

[Anonymous]

Trying to read plugs after the engine is idling really won't work. And, many people make the mistake of looking at the white porcelain part, to read a plug right you have to look way down inside the shell.

Also, the only way to read a plug is to install a brand new one, do a full throttle run and then shut the car off at the end of the run (very bad for a turbo!!)