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Which GT35 Turbine Housing. 0.82 or 1.06a/r for RB26

Shaun

By Shaun,
in Engines & Forced Induction

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Shaun Mentor

Shaun

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GDay,

im putting a single Garrett GT35 turbo on my RB26 and was after peoples experiences with boost threshold for different turbine housings. Im tossing up between the 0.82A/R and the 1.06A/R turbine housing on the GT35. Does anyone have first hand experience of when i can expect boost with either of these housings?

The engine has forged internals, no head work, and standard cams for the time being.

I suspect it'll be the 0.86A/R because i want response for street driving, but i just thought i'd ask as the difference between the two housings is 100hp i think.

Thanks,

Shaun.

Butters Experienced

Butters

Posted
Posted

Depending where you look, it varies between 20 hp difference and 100 hp. I did find an 80 hp variance in one place.

Gotta love acurate net info ...

Everyone seems to rate the 1.06 rear one as 700hp.

The .86 rear seems to vary between 620hp and 680hp ......

actaully just found a site that rates the .86 rear as 700 hp too

Be really nice to know exactly what the .86 rear one is rated at if anyone knows for sure ??

The Garret Catalog rates the .82 and 1.06 from 400 - 600 hp ....

BezerkR32 Veteran

BezerkR32

Posted
Posted
GDay,

im putting a single Garrett GT35 turbo on my RB26 and was after peoples experiences with boost threshold for different turbine housings. Im tossing up between the 0.82A/R and the 1.06A/R turbine housing on the GT35. Does anyone have first hand experience of when i can expect boost with either of these housings?

The engine has forged internals, no head work, and standard cams for the time being.

I suspect it'll be the 0.86A/R because i want response for street driving, but i just thought i'd ask as the difference between the two housings is 100hp i think.

Thanks,

Sha

un.

.82 housing will be better for street use as 1.06 is better suited for bigger capacity engines, dont get me wrong, it will work, but at about 3800-4000rpm

Shaun Mentor

Shaun

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Thanks guys. I know its a bit of a touchy subject (Re: single or twin turbos for street use), but im going to try to get the best of both worlds and go for street friendly response with a single high mount turbo. Ive had a mismatched turbo before (GT30 0.86a/r on RB20) and the boost threshold was way too high for my liking. It came on full at about 4200rpm. Id like boost by 3300 or so with my RB26 package, however, i dont want it to die off too much in the top end either. I dont know if im kidding myself though.

Any other thoughts/experiences would be appreciated.

Shaun.

RS500 Experienced

RS500

Posted
Posted
Thanks guys. I know its a bit of a touchy subject (Re: single or twin turbos for street use), but im going to try to get the best of both worlds and go for street friendly response with a single high mount turbo. Ive had a mismatched turbo before (GT30 0.86a/r on RB20) and the boost threshold was way too high for my liking. It came on full at about 4200rpm. Id like boost by 3300 or so with my RB26 package, however, i dont want it to die off too much in the top end either. I dont know if im kidding myself though.

Any other thoughts/experiences would be appreciated.

Shaun.

what boost level are you planning on running with this setup?

what kind of power are you really after?

i don't know about the other guys, but i don't think you'll see fullboost (i.e., ~15psi +) at 3300rpm with your RB26/GT35 (A/R .82).

if you're after fullboost at that kind of rpm and you want it to be streetable with plenty of poke, i'd recommend you go for a Garrett GT30R with A/R .82 exhuast housing.

it will be very streetable and still make a peak power of 300rwkw with ease, with a very good average power in the usable rpm range.

Shaun Mentor

Shaun

Posted
  • Author
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Id probably run up to 1.5 Bar. I definately want over 300rwkw; Id be stoked to get 350, but thats pushing it a bit seeing as though i want low down response too. The engine is going in my gtst, so its a two wheel drive format.

Whats the difference between a GT30R and a GT35?

Also, all the highmount manifolds around are only available in T4 flange. Does anyone know if you can get Garrett turbos with a T4 flange? Theres one advertised in the For Sale section but i didnt know if it was a typo because i thought all Garretts came in T3 only.

Shaun.

Shaun Mentor

Shaun

Posted
  • Author
Posted

Thanks Bezerkley; the problem with GCG is that they dont have highmount manifolds for the RB26 yet; ive been waiting for about 6months for them to come in. Are you talking about putting 30/40bb turbos on RB20/25 GCG manifolds? Because they have those in stock.

I can get the manifold in a T4 flange so maybe instead of modifying the manifold ill look at getting the turbo in T4 flange.

Anyone know of any other places that offer highmount RB26 manifolds with a T3 flange.

GCG Hi mount manifold has T3 Flange. We have fitted 30/40bb turbos on these manifolds.

You can get exhaust housing in T4 flange if you need it.

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