Kool

After doing the research that I should have done prior to buying my current turbo.

Below is the graph the pink line is 18 psi at 3250 rpm and 6500 rpm. The yellow is 15 psi at 3250 and 6500 rpm. Both intersections at 3250 rpm are to the left of the surge line.

Now what is this telling me. That my turbo cannot make 15 or 18 psi of boost at 3250 rpm safely? Or it can but will be at risk of surging?

I listed the figures I used below.

ltr disp. 2.5
VE 85
Boost 18
Pr 2.224489796
RPM
CFM@3250 271.4290221
CFM@6500 542.8580443

lb/min @ 3250 19.0209546
lb/min @ 6500 38.0419092





I know there is way more knowledge on Renny with this stuff then I have.

Kool

Here is a much better looking map 62-1 t04B.

blown 944

here is what I came up with a t 300 hp ~15 psi this turbo is really good fro 300 but not spooled until ~ 3400. Of course the hotside plays a huge part.
http://www.squirrelpf.com/turbocalc/...&product_id=66

blown 944

my favorite at 300 hp 57 trim HERE

blown 944

18 psi

blown 944

or better yet my typical setup look at the efficiency numbers

porschefig

Sid, what's your favorite for 400 hp?

blown 944

Garrett 3076

Holset hx 35

Duke

Kool what turbo have you got? Never heard of a V2 trim kompressor.
Also! Remember to add the IC pressure drop to the PR. So add around 0.2 of pr to your desired boost numbers.

Kool

Duke

To the best that I can tell my turbo is a T04B housing with a Super V compressor

Inducer 2.18 Exducer of 3.00

The hotside is a KKK #8.

I have extrapolated all of this by measuring and looking up trim and what not. I bought the turbo completely unaware of what I needed as a Stage 1 from SFR.

My goal is to run a 18 psi but based on the maps i believe my turbo is too small.

blown 944

Duke

The Vtrim is an old garrett design. diesel mostly.

and yes I have ran one . Actually I have ran about all the to4b and to4e compressors. That is the benefit of knowing a turbo rebuilder . Try it..... pull it...... try another.

blown 944

Kool that is not a v trim it is a 54 trim

the v trim uses a 2.75 exducer

sorry if I didn't see that earlier

Kool

I am guessing it is a V based on measurements I took of the compressor wheel. I cannot be sure. Just to be clear.

Kool

OK then where is the for that?

Glad I posted. I was feeling a little lost.

blown 944

15 psi ~300 hp

18 psi