Thread: Wastegates...

Okay, I know most say that you run small gates with big boost, and big gates with small boost, that much I'm sure of...

The question I have, though, is what defines "big boost", or "small boost"?

For instance, what is considered "small boost" on a GT3076R, with an .82 A/R? Stock boost is 15psi, IIRC, correct?

So, if you're running this GT3076R .82 A/R at 15~20psi, then is it safe to say that a 44mm wastegate is appropriate?

Thanks for any information you can provide. I did a forum search and didn't come up with much on this particular subject.

im just subscribing to this gonna run the same setup have the same question on my mind

Reason I'm asking:

Order contents: (Top Mount turbine setup)
Protech Equal Length Stainless manifold, Stainless
Recirculated dumptube, Stainless
Protech Midpipe and Downpipe, Stainless, V-flanges
Garrett GT3076R .82 A/R w/ V-clamp housing
44mm TiAL wastegate
HKS v2.0 SS blowoff valve

Just placed the order with Bruce over at Protech. Said it'll take about 6 weeks from start to finish.

So excited!

Future setup:
SR20DE (USDM 120K clean) P11 5spd Tranny
Brian crower STG 2 Cams
ACT XTPP with 6 puck sprung disc
740cc Nismo Injectors at 4bar
Z32 MAF
Calum Realtime ECU
The above mentioned order ^^^
VRS 3" Stainless cat-back exhaust

Anything else I should be looking for, regarding this build? Recommendations to motor internals? Should I drop the C/R down with a thicker head gasket? Looking for stock boost on the 3076R until I get more acquainted with this new setup...

A bigger gate gives you better flexibilty on boost levels withoutworring about creep. The closer you are to the turbo's limit the smaller gate you can run and not have creep issues. If you wanted absolute max boost you'd run no gate right? So from that perspective the closer you are to the turbo's limit the less critical gate flow becomes. A 44 will work fine for your setup. To be honest, I've run a number of t3-4 setups with 38mm gates on sr's and I've never experienced any creep whatso ever. These wre mostly 350hp setups as well running anywheres from 15-20 psi, not something I would consider near the flow limit of a 57trim stage3 wheel.

I am going to be running the same turbo and I just orderd the tial 44mm on monday I figured to just buy the bigger one now instead of buying another one later

im going to be using a similar set up to you and im also thinking about what size gate to run, i think im going to go for the 44mm tial, although the 44mm is a v-band flange yes, i want to use a protech top mount log manifold but these are only flanged for the 38mm and 40mm wastegates yes? what can i do to overcome this?

sorry to hijack a little :o

No worries, you weren't hijacking.

Bruce at Protech can flange the wastegate for whatever size wastegate you prefer to use. In my e-mail traffic with him, he told me he can do from 38mm wastegates to 48mm wastegates. This of course was on the Equal length manifold though, not the log style manifold. Your best bet it to just e-mail him with your questions.

[EMAIL="Mike@protech-fabrication.com"]Mike@protech-fabrication.com[/EMAIL] His name is Bruce Collins.

Oh, and to re-address my second question...

What are everyone's thoughts on going with a thicker head gasket? Would it be more benificial for me to go with a thicker style head gasket? Or would running the motor as is be fine? I'm not looking for crazy boost, as previously mentioned. Just from 15~20psi or a little more.

I would say run the cosworth 1.5mm HG. 15-20psi from a 3076r is a lot of boost for 9.5:1 cr.

I do not know the stock thickness of the VE HG, but there is nothing wrong with fine tuning the CR with a different size HG, that is what they are made for.

17-18psi is the max on pump gas with many hours of tuning from a 3076r. My bud has managed 400.2rwhp off a 3076r and haltech on 18psi and 91oct.

Even nissan uses HG thickness to fine tune CR. They use a .9 on DE and 1.1 on det. Thats just retarded to say only change pistons and don't use anything other then stock thickness gasket.

Thanks for the input. I see what you're saying.

Anyone else have experience with a DE on a 3076?