Hi guys has anyone fitted a garrett gt32 turbo to a 4x4 saff cossie, if so i was thinking of fitting one and wondered if i need any other parts to fit it and would it be a good choice of turbo to use ?

 

how much bhp r u aiming for???

 

Probaly about 350 bhp mate

 

go for a t34 with .48 ex housing tried and tested

 

 

turbos have evolved a LOT since t34.... never the less Dave Henshall has a point!

investigate garret GT28R turbo... think it would be more apropriet for 350bhp...

good luck!

 

GT3271 is far better in every way than a T34, with a 0.48 or 0.63 housing.. and cheaper new than Ive seen most T34's second hand...

I don't know why you lot still hang on to them so much, it is so old hat...

 

you would need a remap though i would think when its installed as it will flow differently than a T34,

how much are you looking at for a brand spanking GT3271...? does it fit direct or do you need to start butchering...?

 

Interested too

 

T34, tried & tested, performs faultlessly, is ideal for 350bhp.. bolts straight in!!

Please explain how a GT turbo is superior.. and please don't come out with any 'faster spool' crap..

 

Tried and tested?? Compared to what..?

The GT32 has a wider range, slightly larger compressor side than the step down TO4B based comp wheel in the T34. The turbine wheel is slightly larger, and has two options of turbine a/r, 0.69 or .78, and the output flange flange can be opened up from 2.5" to 2.8" if nesseccary. It has a standard T3 manifold flange.

Then there is the off the shelf option of having the GT 76mm compressor wheel fitted to the same housing, with potential for 520bhp and all cheaper brand new than the cost you see most T34's second hand..

 

Dave,

I don't see anything there that makes it a better turbo for 350bhp. By "wider range" are you referring to on average better efficiency across the map?

 

Who said anything about 350bhp..?

Not only will it flow better than 350bhp, but the efficiency map starts earlier than what the T34 can supply. Hence, wider range.

 

Here are the two comp wheels (71 and 76mm) available - Even the 76mm comp wheel is damn good compared to the 71, hardly any difference at the left of the map, yet it will flow a good 12lbs more a minute if nesseccary..

 

About Ł400-Ł450 shipped..

 

is the gt roller bearing

 

Nope, journal.

Only turbos with an R after the number are RB..

 

Dave.. the original poster said 350bhp..

Why don't you compare the T34 compressor map to the GT35 ones you display above.. ?

Also, you must take into consideration the fact that you're not going to be achieving 350bhp @ 1 bar to stay in the peak efficiency area of the GT35 map.. Once you actually pipe up to the 1.6 bar (or thereabouts) that you need (at a reasonable efficiency) then you're starting to wander a little bit..

Sure, the GT35 looks like a nice compressor.. the smaller trim is more suited to 350bhp.. not sure how that indentation in the surge line will actually affect things IN the car.. ya never know until you try..

 

 

Pardon myawful photchopping...



My dodgy red line reflects a fairly typical flow characteristic of a cossie.. As you can see, both the GT35 and the T04b/S-3 compressor is 'too big' for the amount of boost a 2 litre engine needs to flow enough air.. The question is, how does the GT35 deal with the surge? Every turbo behaves differently.

What actually happens in reality is the T34 surges, but you don't hear it, feel it, and it doesn't break anything.. but the GT35's can't run full boost until they get to about 30lb/min of air flow.. otherwise they surge themselves to pieces..

The GT range are great.. but something like a 35 really belongs on an engine with much more flow at lower pressure ratios (like a big v8) where you're nowhere near the deadly surge line..

I'm just talking from experience here..

 

Ill go and tell Garrett to throw away all their new comp wheels and stick with the 30 year old designs then!

Your T34 only hits a max of 73% effciency, and loses this at any thing over a bar, where as the GT32 holds 78% right up to 1.8bar, and can pull more peak boost over a wider range with better efficiency..

If you look at the GT32 map, the least efficient range shown is 65%, on the T34 map, they plot right down to 50, so ignore those lines and look how narrow the efficiency range is if you stop at 65%..

And were not talking about GT35's here (as a whole turbo), were talking about GT32s..

 

Here's a better plot of all three..

As you can see the T34 is quite close to the GT3271, but not quite. Remember also, the T34 uses a bigger a/r comp housing, which in the real world affects spoolup.

 

What you have to weigh up also, is for the cost of rebuilding a T34, and getting back a used, but reconditioned and sandblasted unit, for a little bit more you could buy a brand new turbo each time...

 

I agree that on paper the GT compressor looks nicer.. but as I said above, it's how it behaves in the car that makes the difference..

 

Exactly, but if everyone keeps harping on about how great T34s are an you don't need nothing else, no one is going to find out!

 

where do you get your turbo's from then.....

 

atpturbo.com

 

and i have to look for a turbo with a t3 flange...(does a t4 have also a t3 flange?)

why the hell are turbo's that cheap over there..and expensive here..

 

Universal Turbos or CR Engineering.. T34 comes in at around Ł650 (non-exchange)..

 

i put a gt30 roller bearin on mine and im on boost 2k earlier and makin more power than a t34 thats good enough for me

 

...mines comes on boost @3000...so that would be 1000..

or do you have a 1600cvh?

 

Is this one suitable for a stage 3 Cossy set up ? I can't see a GT3271 model on ATP.

http://www.atpturbo.com/Merchant2/me...egory_Code=BCS

 

Or this one ?

http://cgi.ebay.com/ebaymotors/Garre...ayphotohosting

 

They are both GT3271...

But, always get the full part number before ordering. The GT32 is also made in a 3267 type with a 67mm comp wheel, so ask to be 100% sure what you are getting.

Only Precision Turbo offer the GT32 in the GT3276 version which is the 500hp compressor wheel.

 

So do i need an internal or external wastegate? Does it matter ?

 

Internal would be far easier, otherwise you need to mod your manifold, buy an ext.wg, fabricate dump pipe etc...

 

Cheers Dave i've e mailed them for a price shipped over inc flange, also asked for full part number and explained for what car etc, altho they probz never heard of em lol...Thanks for your assistance.

 

1600 cvh

 

im on internal and im havin a problem with the waste gate blowin open at high boost

 

I thought the wastegate is meant to open at high boost!..

Or do you mean opening early...?