I am having TEC here in Golden, CO, build a turbo for me. They are thinking that a T04S04 will be big able to produce 450 RWHP at ~1.2 bar on a street-ported engine. Now they won't release the exact compressor and turbine housing sizes yetr, but they say "...they are on the large side." I am assuning somewhere along the lines of a .84 comp. and 1.32 ex.

Any one have any thought on this?

There are a couple of other options that I am going to be talking to them about also.

Thanks,
Jeremy

 

Wow! that's a big exhaust a/r! I hope they have a really aggressive wheel. Correct me if i'm wrong about the a/r size.....isn't the T88 a 1.15?

 

94 silver r2: I can't believe that i didn't notice your screen name! How cool is that? how many miles does yours have? i've got 7500 on mine.....hardly driven i know but that'll change here soon

 

physical size has nothing to do with the A/R size,

you could have a TD04 with a 1.5A/R exhuast housing and it'll only flow 1/4 the exhuast gas of a T04 0.8A/R exhuast housing.

now if i recall correctly the T88 uses an exhuast housing slightly larger than a normal T04. and guys out there are using 1.32A/R exhuast housings on T04 - To very good effect (590HP @ 19psi)

exhuast A/R signifies total flow capacity and spool up times when comparing one exhuast housing to another PROVIDED it is in the same family of housings

 

Thanks HWO! I'm still learning about the details of turbo's....i've always left it up to the turbo "specialist" and never really got to deap. I've just always heard that the a/r effects spool up and total flow but didn't realize that the numbers were different between the makers.....seems like it would be a standard thing.....learn something new everyday

 

A/R ratio is just one factor... comparing one turbo to a different type of turbo based solely on A/R would be like trying to judge the speed to two different cars based on how big the throttle bodies are.

 

If they told you it's a T04S04, then your compressor wheel is set.&nbsp You already know the turbine A/R.&nbsp It's just a matter of finding out what your turbine wheel size is - it's most likely a O-Trim or a P-Trim, possible clipped.



-Ted

 

thats close to what i have from my turbo i got from turbopnetics.