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1.06 Vs 0.82 Gt35 On Rb26 .

discopotato03

By discopotato03,
in Engines & Forced Induction

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discopotato03 Grand Master

discopotato03

Posted
Posted

Hi all , someone I know has the 1.06 non gated turbine housing on a VL with an RB26 in it . He'd like to know what difference it would make having the mid sized or 0.82 A/R housing instead .

I believe ATM it makes full boost (~ 22) at a tad over 5000 revs and he would like that to ideally be 1000 lower .

Anyone been there with both these turbine housings on a GT3582R and an RB26 ?

Cheers A .

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The Dan Grand Master

The Dan

Posted
Posted

There is something wrong if he makes only 22psi at just over 5000rpm.

Noel's 33 (RB25DET) makes 26psi at 3800-4000 and 400rpm later on the 1.06.

Tuning, cam timing, the rest of the setup, will all determine how efficiently it will run.

Don Dada Mentor

Don Dada

Posted
Posted

I'm no turbo expert but why the hell ppl go for the largest turbine Garrett has to offer if they dont intend on using the turbo to its absolute limit?!?

The way i see it is that u choose the a/r of the turbine housing in relation to what average power u intend to make so say if the 1.06 puts the turbo in the 600hp range and u only want 550hp then go for the smaller back end with the advantage of improved response

Which brings me to a question....The hp rating garrett state on their site, is this when using the largest 1.06 housing?

So i guess it might be a question of if your mate wouldn't mind loosing some power if any at all to get improved response because i'm sure there will be noticeable difference between the 1.06 and the .82

The Dan Grand Master

The Dan

Posted
Posted
I'm no turbo expert but why the hell ppl go for the largest turbine Garrett has to offer if they dont intend on using the turbo to its absolute limit?!?

The way i see it is that u choose the a/r of the turbine housing in relation to what average power u intend to make so say if the 1.06 puts the turbo in the 600hp range and u only want 550hp then go for the smaller back end with the advantage of improved response

Which brings me to a question....The hp rating garrett state on their site, is this when using the largest 1.06 housing?

So i guess it might be a question of if your mate wouldn't mind loosing some power if any at all to get improved response because i'm sure there will be noticeable difference between the 1.06 and the .82

You are almost right.

All of the GT3582's are rated to the same hp. The compressor determines air flow = determines hp output.

The turbine's are all the same size and the blade angles are all the same so there is no differences there.

The A/R of the turbine only changes shaft speed vs exhaust flow.

They rate their turbos based on the compressor maps which has nothing to do with turbine size. However, if you pick the smallest ratio, you will have a hard time getting it to flow the numbers later in the rev range because it moves out of its efficiency range.

eg. They will all flow exactly the same air from the compressor at a shaft speed of 120,000 rpm. The A/R or the turbine housing determines when the shaft speed will get to that point.

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