fifai

This is a garrett one, with BB bearing




Another pics :

http://924cup.fr/doc/turbo/turbo1.JPG

http://924cup.fr/doc/turbo/turbo3.JPG

http://924cup.fr/doc/turbo/turbo4.JPG

http://924cup.fr/doc/turbo/turbo5.JPG

http://924cup.fr/doc/turbo/turbo6.JPG

As the compressor housing is 0.5AR it can be a GT3071R ?

Darwantae951

Your best bet would be to pull the housings and measure the wheels.

Scott H

Without precise measurements all we can do is guess. You need to remove the compressor housing and measure the minor and major diameters of the compressor wheel.

fifai

ok i will get the turbo this week and i will do measures !

What is disappointed to me is that the seller told me that it's a GT3076R ... so there is no anti surge system ... and all '76 I've seen on the net has 0.6 ou 0.7 AR on compressor.


I've another question about turbo calculation, i wish know what flow go thru the turbine.

How can you determine EMP (exhaust manifold pressure) ?

Darwantae951

If you take measurements and determine what turbine wheel is installed, then there should be a plethora of charts giving you all the information you need.

blown 944

It has a t4 turbine flange so not a bolt on.

Too hard to guess the wheel sizes but looking at the compressor inlet slope, it looks like possibly a 50-57 trim and the turbine wheel looks like a stg 5 size.


You may be able to pull something up for the turbine housing as it looks like it is an ATP casting.

kev951

looks like a gt30r 3076 or 3071 judging by the cold side housing. take the serial number and call ATPturbo and they will tell you which turbo it is via serial number. That's as close as you will get. You wont get any specs. just a model .

333pg333

I have a 76 with a .50a/r sitting on the shelf. Great street/track turbo for a 2.5L car if you can get it to fit.

kev951

thats what I'm using in my car, (see avatar)

fifai

Well,

I'v got the turbo into hands, I will do measures this evenig, but a piece of strong paper of +/-57mm goes in the compressor inducer

so it seems to be a "76" one

and 55 mm for the turbine exducer so GT30 ...

the serial number is 700382-5012 it confim that it's a GT3076R !

Thanks for informations !


So the GT3076R exist with no anti surge compressor housing .50a/r ?
Compresor effective outlet is about 43mm and inlet is +/-66 mm


Acording to the seller (who was right) the turbine housing is .82 a/r
So on a stock 2.5 L (with only a NA cam 9R) can it be ok ? What about lag ?

In another hand, I'm able to buy a GT30 K26 housing .62a/r is it worth to buy it ?

( This turbo is for a 924s with 951 engine )

fifai

I have new informations :

Compressor trim is 56 (57 mm inducer diameter)
.50A/R (no significant impact ?)
Turbine trim is 84 (55 mm exducer diameter)
.82A/R

-The flow map show a max of +/- 53 lb/min is it equivalent to a LR53 ? a few bigger ?
-Hot side A/R is equivalent to a 11# or 11 cm². Right ?
-Stage V (five) is equal to a +/- 80 or 84 trim ?

Maybe too much questions but it's first time that i discover turbo technology !

blown 944

Good pickup. It'll privacy spool 15 psi at 3300-3500 rpm. Good for a wide open track for sure.

333pg333

Your power to weight ratio should help with lag too.

kev951

little high A/R for my taste.

fifai

Ok i will see to buy another turbo (old) with a K26 turbine housing with .63a/r it will be easier to install.

But is .82a/r may be good with a 9R camshaft ? to my mind this cam improve exhaust after 4000 rpm !