1.06 Vs 0.82 Gt35 On Rb26 .

[discopotato03]

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 .

[The Dan]

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]

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]

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.

[Super Drager]

The GT3582R in my dads old R33 had a 1.06 rear and was on full boost by 4500rpm, can't for the life of me remember how much boost but i think it was in the 21-23psi range

[DRIFTER]

single on a rb26 is a dirty word around here.

[n1k00]

single on a rb26 is a dirty word around here.

not just here in general why not go with two decent sized bb twins to make the same horsepower only quicker

[discopotato03]

That particular VLT was bought as is not built . All I know about the thing is its been rebuilt with better rods/pistons . Standard cams and head work not sure . Fab'd ext gate manifold .

A .

[DRIFTER]

not just here in general why not go with two decent sized bb twins to make the same horsepower only quicker

i'm sorry but that statement just isn't true.

[PM-R33]

Here we go again lol.