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Xr6 Gt35r

Bl4cK32

By Bl4cK32,
in Engines & Forced Induction

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Bl4cK32 Grand Master

Bl4cK32

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Below is two pics of the GT35r (GT35/40R) turbos.

The one on the left has the .5 front cover as it came off the ford xr6 turbo.

The one on the right has a .7 front cover supplied aftermarket.

The turbo on the left (.5 ar front ) has a hose going from the actuator to a bung on the compressor cover, where the 0.7 cover one on the left doesnt have this at all.

Where do you need to attatch the hose coming off the actuator if you have the 0.7 front cover?? Somewhere after the outlet of the turbo on the pipework?

Thanks :)

post-3692-1128825810.jpg

post-3692-1128826268.jpeg

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Bl4cK32 Grand Master

Bl4cK32

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cool. Now for another question :O

Is it just a simple job of swapping the 0.5 cover for a 0.7 cover between the two turbos?

Ive heard so many people say they are different specs, but are they different, or the same? ie, if i bought the one on the left, could i unbolt the front cover and swap it for a 0.7 ar front?

Thanks :)

Edited by Bl4cK32
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discopotato03 Grand Master

discopotato03

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No , the .50 cover is T04E series where the .70 is T04S series . You would need to change the back plate/adapter ring as well . These butt up to the flange on the comp side of the cartridges bearing housing , are sealed with an O ring and held in place by a large circlip .

Try to buy it as you want it because the bits are not always cheap , when I inquired through GCG Brett said he could supply any of the three .50/.60/.70 "E" covers or the .70 S cover for the same price .

Cheers A .

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Bl4cK32 Grand Master

Bl4cK32

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Ok, now ive got a good question disco (or anyone else) :

what is the difference between the T04E and the T04S covers...and when comparing same size covers - 0.5 T04E vs T04S?

(Also disco, what would you say would be the best on my motor, the 0.5, 0.6 or the 0.7?

What would be the difference in power spread over the 3 covers?

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Dobz Experienced

Dobz

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If you're looking to make fairly big power figures i.e. 300kw plus then you'd want to keep the .7 cover for the simple fact that it efficiently flows more air which is whats needed for big power and turbo reliability.

Anything under 300kw the .5 cover would be fine but thats pushing it.

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Cubes Grand Master

Cubes

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hrmmm .6 you say disco.

I would still prefer the .5, you will need all the response you can get with the 1.06.

The XR6 boys don't seem to have trouble cracking 320-340rwkw on the .5 comp cover. More than enough for the stock rod rb30. :)

Then again... The .7 comp gt35r 1.06 turbine will still have better response and spool time than an rb20det with a highflow or 2530 on it. :blink:

Edited by Cubes
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Bl4cK32 Grand Master

Bl4cK32

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If you're looking to make fairly big power figures i.e. 300kw plus then you'd want to keep the .7 cover for the simple fact that it efficiently flows more air which is whats needed for big power and turbo reliability.

Anything under 300kw the .5 cover would be fine but thats pushing it.

Well i guess you should talk to GCG then, as they think differently. I emailed them and they said :

Thanks for the enquiry. For an RB30, I would suggest using the 0.60a/r Compressor Cover for your application. The difference between the 0.5a/r covers throughout the the T04 Range is the inlet and outlet sizes, and designs of the covers. They would all work in the same way, and produce similar, if not the same figures. We have had good success with people keeping the standard 0.70 T04S Compressor Cover, but you can drop to the 0.60 for better response

This is on a street driven car.

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Col-GTSX Grand Master

Col-GTSX

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I would use it as is....

I mean try and if no good then swap em over....

There is just too much hear say on these topics....

I was told a standard r33 turbo on an rb20 would not produce a cent over 180rwkw and i got it too 230rwkw.... So who know's????

I would take Bretts advice as a starting point but if your un happy with the results you can always change it....

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Cubes Grand Master

Cubes

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Fatz made 270rwkw on 14psi with an untouched rb26

ecu running 10:1 afrs.

If the motor has forged rods then I would say the .6-.7 a/r cover would be worth while.

Remember with the .5 on the 3ltr its not going to really start going until 3800-4000. Is it worth making it even laggier and less responsive?

Edited by Cubes
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Bl4cK32 Grand Master

Bl4cK32

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I'll trust fact that GCG know what they are talking about. Ford used the 0.5 front as it was a low boost application to keep the power down. (am i right...lol?) I think the slighlty bigger compressor (0.6 front) will be a bit better for a little more (14 to 19 psi) boost than Ford was running. If i wanted more boost again (ie 20+ psi) id go for the 0.7 front....thats my theory anyway, and im sticking to it :P

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Cubes Grand Master

Cubes

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The reason Ford used the .5 comp cover is for response, nothing to do with keeping the power down or because it is a low boost application.

There is no doubt the larger comp cover will be more efficient and make the power easier but not that much.

As a bodgy comparison...

Consider the GCG highflows, the stock rb comp cover makes say 245rwkw odd. Slap on a .7 and it makes 260rwkw.

Thats 15rwkw.

Then consider dropping on a larger turbine housing, 245rwkw or so jumps to 277rwkw.

What I'm getting at is the biggest gains are to be had from the turbine side, not the compressor cover.

From what I've been reading up on, the larger .7 comp cover only offers 3-4% increase in power.

I really think your better off spending the $$ on a nice set of cams and springs that will need doing and pick your self up a second hand $1400 XR6 turbo.

Cams with the large turbine housing will work very well.

I think from more of a performance to $$ point of view.

Edited by Cubes
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