PSD turbo?

[Anonymous]

A guy i know just totaled his Super Duty about a week ago. I was thinking about putting the turbo on my 95 f150. I was wanting to know if this turbo is too big, and if anyone's done this before. If they have, can they give me a few pointers on how to get this thing put on?
Matt

 

[StrangeRanger]

The "quick and dirty" way to check compatibility of a turbo for a different engine is to look at:

displacement x RPM for peak HP x (15 +boost pressure)

The value should be approximately the same on the new engine as on the old. Even this does not guarantee that the turbo will work well in its new home. If it's too large, you get into the wastegate too often and too quickly. If it's too small you get turbo lag.

Looking at your application:

For the PSD:

444 x 3000 x (15 + 16) = 41,292,000

For a 300 assuming 10 PSI and 4000 RPM peak:

300 x 4000 x (15 + 10) = 30,000,000

So unless you're willing to boost your 300 by a lot more and/or spin it way faster, the PSD turbo seems too big. It might work, but not very well. There is also the fact that it is non-wastegated, which could be a problem on a somewhat more fragile gasoline engine.

 

[Anonymous]

ok, thanks for the reply. I've never worked with turbo's before, but i've seen a couple trucks and cars with then on this forum. I'd like to get alot of power out of my 300. Do you think if I built the motor some it will work? I'm planning on having it rebuilt, and i was going to put it on after the rebuild.
oh yeah, i forgot...why did you put 15 in with the boost?

 

[StrangeRanger]

You have to use absolute pressure or PSIA (i.e. pressure above absolute vacuum), not gauge pressure or PSIG, when you're looking at compressor capacity. Atmospheric air at 0 PSIG has an absolute pressure of 14.7 PSIA, close enough to 15 for a ballpark estimate.

I really don't think the PSD turbo is going to work. It will make boost but it is so big it's going to have lots of turbo lag and won't really give any significant boost until you're at the top of your RPM range. Your best bet is to get a compressor map for the PSD turbo (it's a Garrett TP-38) and plot the 300 on it to see where it fits. Even without looking, I'd just about bet the farm that you cannot get it into the sweet spot of the boost map.
Even if the compressor can be made to work, the turbine is guaranteed to be too big. You really need to read Maximum Boost by Corky Bell and Turbochargers by Hugh MacInnes before tackling a turbo project.

 

[Anonymous]

ok, thanks for the replies strangeranger. Where can i find those books? I guess i really need to learn more before i go sticking a turbo on my motor, huh? What kind of turbo do you think i should be looking for then? I'd like to get a turbo put on this thing, but i don't want to just stick on anything i can find. I thought the PSD turbo would work because it is a diesel and it doesn't rev high, so i would have more low end torque.

 

[StrangeRanger]

www.motorbooks.com

For a 300 where you want a performance buildup a small-trimmed T04 series will work nicely; if you simply want more torque in the stock RPM range a large-trimmed T03 will do the job.

 

[StrangeRanger]

I found a map for a TP38 on-line.
The PSD version has a 1.1 A/R turbine. That thing will never spool up.

http://turbosaturns.net/forum/viewtopic ... fba428930a

You'll need to run a LOT of boost to get into the working area of that turbo

 

[Anonymous]

lol, i was getting ready to ask if you could put a smaller pulley on it. What if i put more exhaust into it? would it put more boost in the low RPM's? That chart looks like scribble marks to me, I definatly need to read that book.

 

[StrangeRanger]

The smaller the turbine A/R, the quicker the unit will spool up.
The larger the compressor, the more boost it will make but large compressors take more time to spool up.

What you want is a quick spool up time and a fairly flat boost curve which cuts across the fattest part of the efficiency "island" on the map without bumping into the wastegate or popoff setting.

On the strip with an automatic tranny, a big turbine is no problem because you can spool the turbo up by loading it against the torque converter. Pop the transbrake and you launch at full boost, stall the converter and disappear over the horizon

You can't do that as well with a manual tranny because you cannot put the turbo under load and you rather obviously cannot do it at all on the street. Turbo lag will take all the fun out of a street-driven turbo, You're way better off settling for a smaller unit that makes boost early and runs out of steam before it overboosts things. The "bragging numbers" on a dyno may not be as high, but it will be quicker in anything short of an all-our race and be much more pleasant to drive.

 

[Anonymous]

ok, i get what your saying. So should i look for a smaller turbo that will pump out alot of air in the low RPM's? I'll check out the "yards" to see if i can find anything off a v6 or something.

 

[66Sprint6]

Its a Holset turbo right? If so...its too big and you need to send it to me in exchange for my T3/04B Hybrid that Im runnin on my SVO
Matt

 

[StrangeRanger]

It's a Garrett TP-38 and it's WAY too big for your SVO

But the T03/04 might work on his 300. For that matter, the stock turbo off a ny ford 2.3 turbo motor might be pretty close. What kind of boost do the 2.3 turbos run at?

 

[Anonymous]

The problem with the garrett TP38 is not the compressor side (actually a good match for your 300) , it is the huge turbine side.

These are weird turbos. they spin in the opposite direction of regular Garrett turbos. Parts don't interchange. Nobody sells smaller turbine housings to help it spool up sooner.

If you put one on your 300 it would make a good pulling rig, but acceleration wouldn't be ideal.

You could sell it on ebay to finance a better choice.

 

[Anonymous]

the Holset of an 94-98 Dodge Cummins is almost Ideal for a 5-10psi setup on a 300-6. I believe they are an H35 or HY35 partnumber.

 

[Anonymous]

It's a Garrett TP-38 and it's WAY too big for your SVO

But the T03/04 might work on his 300. For that matter, the stock turbo off a ny ford 2.3 turbo motor might be pretty close. What kind of boost do the 2.3 turbos run at?

Late, late post I know, but I haven't dropped in lately and since no one else has I thought I'd answer the question.

It depends on which 2.3T your talking about? The early Ford Thunderbird TurboCoupes used a non-intercooled water/oil cooled IHI unit while the '87-'88 T-Coupes used an intercooled, oil-cooled Garret T3. IIRC, the IHI maxed 12-15, with the T3 maxing 15-18. Idk about the SVOs/Merkurs.

 

[Anonymous]

IHI unit while the '87-'88 T-Coupes used an intercooled, oil-cooled Garret T3. IIRC, the IHI maxed 12-15, with the T3 maxing 15-18. Idk about the SVOs/Merkurs.

You got it backwards....the good turbos are the earlier ones, which were garretts and flow about 25-28 lbs of air per minute. The worse ones were the IHI, which were smaller (better spool up) but ran out of air flow much more quickly.

The 2.3 liter experts reside here: http://www.turboford.net/index.shtml