Gt30 Turbine Housing Options

[harks]

Hey guys,

firstly, i've researched alot and this is more for second opinion.

I'm moving to a signle turbo high mount set-up, i looked into GT3582R, 5858, 6262, and GTX3076. My mechanic reckons 3082's the way to go, but im of the mind that a GTX3076 is what im looking for, im aiming for a responsive 320-340awkw on 98. my plan is T3 6boost mani, into GTX3076r .82 A/R into 3.5"dump back exhaust. It just seems that the 82 housing is too large on a GT30, plus garret doesnt advertise them so custom match nowadays?

From what ive plotted on the compressor map i believe the GTX3076 is what im looking for. My question, is it worth going T3 split pulse and twin scroll, will it actually affect response? or just go single scroll T3? or would going the 3082 with twinscroll T4 be on the money?

Additionally will going to the 1.06 A/R be noticably laggier given the relatively small/light compressor housing? worth looking into to meet my power/response goal. The car is my daily but will be seing track work.

cheers in advance

Dan

PS please dont say go -9s

[Dale FZ1]

Assuming you're running the R32 V Spec in your sig.

GTX3576 with 0.82 T4 split pulse should be close to the mark.

I'm not entirely sold on the GTX3076 combination, but a single scroll T3 1.06 housing should give some good turbine flow capacity for high rpm breathing efficiency. I'd think a 0.82 housing would restrict the usable rev range - not what I'd want from a RB26.

RB26 won't pull too hard under 3500 anyway, but either of the suggested combinations should do a fair job between 4000 and 8000rpm plus.

[scotty nm35]

There is probably 200 rpm difference between the .82 and 1.06 from my experience. The larger housing will feel much punchier when it comes on as it will improve top end torque.

Why 98? A GTX3071 would do that power if you went ethanol, with much better response.

[harks]

Thanks for the feedback.

Dale good point, i having been studying the compressor maps, and it seems to point that the GTX3576 is at higher efficiency at fractionally lower airflow, but overall slightly less responsive, although twinscroll .82 i thionk would be a pretty nice steup.

Scotty - im planning on 98 since ill be posting to Wagga Wagga next year for 12 months and will not have access to ethenol fuel. i anticipate once i move back to Brissy on moving to an e-flex setup.

i was unable to find a Garret T4 divided housing option for the GTX30/35's though, is that an ATP rear housing option or something?

Cheers

Dan

[discopotato03]

The proper twin scroll Garrett housings have the same sized volute passages but they increase in area before the inlet ports on T4 flanged ones .

A bit more exotic but have you considered the HTA variants like the 3582HTA or even a 3076HTA ?

A .

[GTScotT]

I am surprised I am the first to suggest this, however a FP 3582HTA with a garden variety T3 housing would likely be a much better thing all over.

In a previous results thread it was back to backed on some form of Audi, showcasing that the 3582HTA spooled closer to a GT3076 but was roughly on par for power with a GT3582.

Now I don't want to the one to flog a dead horse, though the 76mm GTX wheel hasn't really had any big wins with anything we've seen so far. Certainly not like we have seen from the GTX3071 nor GTX3582. I believe even the GTX3576 result on this forum wasn't overly 'wow', either.

Just going to drop this here:

http://store.forcedperformance.net/merchant2/merchant.mvc?Screen=PROD&Store_Code=FP&Product_Code=NTGT3582HTA&Category_Code=Turbo-FP

[scotty nm35]

I fit my old GTX3076 into a customers 34 the other week, using a Kando rear housing, it made 380kw with a built auto at 25% slip. It maxed Trent's hub dyno putting it into emergency shutdown due to the massive torque it produced. I think people are giving the 76 the raw end of the stick personally.

[harks]

damn, thats pretty nice Scotty. im guessing ujsing an ethanol based fuel?

i Looked at the HTAs, the 3582 is bigger then what im looking for; this is a DD with a little trackwork but the daily part really is the considering factor, but the HTA3076 looks like its a nice peice of kit. Does anyone have any experience dealing directly with FP? i;ve heard people say they can take weeks and weeks to "prepare and deliver" products, i understand theyre overseas, but... i dont want to wait a month after order. plus im not sure if the extra $$ will be justified vs a GTX, there surely cant be THAT much difference between them (yes they are different compressor specs)

it has gotten me thinking though.

[scotty nm35]

damn, thats pretty nice Scotty. im guessing ujsing an ethanol based fuel?

Is there any other fuel to use?