evil 944t

I agree with Wayne, the cam could be changed and .82 would be good but you may find a slightly larger housing will control wheel spin a bit.. depending on the output of course.

special tool

Mikeroz - be careful when selecting turbine housings.
Even more "experienced" mechanics may forget that the GT35R comes with a T3 based housing NOT a T4.
Since you are using a T4, best to stick to .68 or under.

The difference is huge.

evil 944t

Si.

JET951

besides the flange being different, what are the other differences? which housing do we have on our car? t3 or T4

special tool

T3.
T4 is much bigger.
Do not confuse ratio (.58, .68, etc.) with overall volume.
The .68 T3 and T4 have the same area/radius ratio, but the T4 needs much more energy to drive its turbine (whatever turbine is in there) at the same speed.
The GT35R comes with a .83A/R T3 based turbine housing.
This is a fine match (IMO) for the 951, a little laggy for a short road course, but a good match.

HOWEVER, you will NEVER open your wastegate with a 2.5 951 if you tried to use a T4 .83... Unless the boost was set to 2psi or you rev to 11,000.

I have used a T4 .68 with P trim on my car, it came off fast.
It was too big even for me, and even the most obtuse dudes here know what I am all about.
Well, I shouldn't say that....Anders44 STILL thinks I am trying to run road courses.

gt37vgt

i have a couple of oem ones but they are 3571 and gt3576 from chevy / Isuzu dura max they are cheap and i gues the gt3576 is an ok option if you already had a big kkk hotside to put it in .
mine ends up as a gt3576vgt it is a 400 dollar turbo but i will have run only e85 to keep the egts low also it has taken me forever to mount it and plumb it up as the hottside is massive on the outside .
the other issue is you have to kind of guesstimate the maps for the oems ones as they are kind of specific to the application .
the fact that these turbos are made in bigger numbers and are plain bearing mean that turbo seller may be able to supply them cheaper but as they are not quite right they need to be under 600 $ to justify the comprimise .
as you will soon spend several hundred trying to get them right

Mikes3.0cabturbo

seems the OEM version GT35R for Ford XR6 is internally gated - one here for A$900 on ebay

http://cgi.ebay.com.au/BA-BF-XR6-GT3...QQcmdZViewItem

333pg333

So is the ratio determined by the wheel over or divided by the size of the internal compressor housing?

333pg333

So when building a motor you have to match the cam, turbo, VE and characteristics, pipe size, exhaust size, c/r, ignition curve etc, er is that all. Jeez you guys make it sound difficult.
So what comes first the chicken or egg syndrome? In other words in what order would you specify those components bearing in mind you are building it to suit a pre-specified outcome?

gt37vgt

you could do alot worse . i think you'll find that turbo is spot on .pretty sure they are getting 370 odd kw atw with that huffer

gt37vgt

http://www.airpowersystems.com/falcon/drags/1163.htm
385kwatw through at crappy auto that adds up to over 600hp

333pg333

That car would make a nice taxi. lol

Mikes3.0cabturbo

Here;s an interesting update from the Guys at ATP, I was talking to them about their GT35R with a K26 turbine inlet bolt pattern and also the option of an E housing vs S housing. I have copied my questions & the replies...

> >> On the GT35R if I change the compressor housing to the optional 3"
> >> inlet 2" outlet, will this change the compressor map? If so what
> >> general impact?
> >
> > For sure, it will change the compressor map. As far as to what extent,
we
> > do
> > not know since the wheel has never been flow mapped on the alternate
> > compressor housing. What we do know is it has no problem realizing the
> > full
> > power of the compressor wheel.
> >
> >>
> >> If I order with the K26/24 hotside is this just the stock hotside
> >> with a KKK flange or is the hotside a different casting shape
> >> alltogether, then on this same hotside can I order a V band outlet
> >> instead of the 4 bolt style.
> >
> > It's a different Garrett casting altogether and not a modified KKK
> > housing.
> >
> > We can accomodate a request for V-band outlet, possibly.

A.Wayne

LOL,

Jim i was not aware gt35 r comes with a t4 flange , i have never seen that , everyone we have ever used have a T3 flange. so i assumed we where talking T3 flanges.
Anyway checked with Garrett , my supplier does not have one with a t4 flange , but if we did use one they recommend a .96 t4 to replace the 1.08 t3 flange , if you error on the small side say .86 . it does seem that a .68 would be too small for a 3.1L engine ...

Duke

There is no GT35xxR-turbo with T4.
All dual ball bearing variants come with T3.