Turbo question

[Guest TurboSedan]

So if the T25 has NO LAG, and falls of after 5,000rpm, why would you go smaller? The thing is already making boost right off idle, there is no reason to go smaller, unless you like the idea of a brick wall at 4,000rpm.

 

go with a smaller turbo? i believe i mentioned using a Garrett T3, which is bigger than the TGP T-25.

 

Yes the TGP part can all be used, btu that doesn't mean its easy. You will need to find every single piece, exhaust manis, downpipes, charge pipes, I'C, I/C charge pipes, etc.

 

i'm under the impression that Jay bought a complete Turbo 3.1 engine (?) nevertheless, the TGP turbo specific engine parts can be found; been there done that (and then after i collected every single piece i found a complete LG5 engine in the local salvage yard )

[88Regal Limited]

oh trust me i know, thats what i meant about it being from a 4 cyl

 

Turbo Iron Duke.

 

[Canada]

It's not like it's that hard to "study" compressor maps.

 

It takes like 5 minutes to learn to do the calculations, and then, once you have the numbers you just use Excel and plot shit out........easy.

 

 

 

 

SO *I* actually agree with Aaron for once.......... :shock:

[Aaron]

Yah compressor maps aren't that bad. Just learn what everything means, and learn how to do each calculation to figure out where your motor will be, and plot it. I studied like 20 maps when looking for the right blower for my car, for M62, M90, M112, Whipple 2300AX, 3300AX, Vortech units, Paxtons, and a few Kenne Bells. It wasn't that bad once I knew what I was doing.

[Guest TurboSedan]

definately something i need to start figuring out....

[timg]

My guess is:

3.1= low redline

Saab= higher redline

 

It may not be as bad as you think using a Saab turbo on a 3.1. On a 3.4 it would be WAY too small due to a higher redline. I would guess that the turbo would peak out at 4500-5000 rpm and boost quite quickly. The redline is also one of the reasons why a 3.4 will use the same size turbo as a 3.8.

 

Tim

[Aaron]

My guess is:

3.1= low redline

Saab= higher redline

 

It may not be as bad as you think using a Saab turbo on a 3.1. On a 3.4 it would be WAY too small due to a higher redline. I would guess that the turbo would peak out at 4500-5000 rpm and boost quite quickly. The redline is also one of the reasons why a 3.4 will use the same size turbo as a 3.8.

 

Tim

 

I doubt the redline of the Saab is higher than 6500rpm, depending on the motor of course, but even GMs new 4 cyls only redline at 6200rpm, with the autos shifting out at 5800.