Stamina

Probably not due to the large differences.

The GT2871 already maxed out the stock K04 compressor housing, requiring a different one be used. Not sure if there's any room left to machine the exhaust side to fit.

Contact him and find out.

SKY888

this pump....

thats my upgraded 255lph pump. Might not be necessary for everybody, but I did it since I rather have more than less..........especially on my current build. Plus I might end up using that fuel line to feed Port Injection on the manifold, if I need more fuel

Iam Broke

iTrader: (10)

^^^Thanks for the info

Grave

iTrader: (7)

Is that the universal one with 5/16'' inlet and outlet?

SKY888

I believe its the universal pump. One shop modified it for me. They already done several for sky/solstice crowd.

let me know if you're interested, I'll provide you with name and contact info. They also do "core" exchange program

Grave

iTrader: (7)

Thanks, I sent you a pm.

Turbo'dSS

iTrader: (2)

Well I thought btf was using an actual gt30r but modified it to bolt up to our stock stuff.

slowbalt84

I have said this plenty of times before and i will say it again. DO NOT use a large single scroll turbo on the stock manifold. It doesn't work. Something about the twin scroll dividers in the stock manifold makes the turbo VERY laggy. If you dont believe me then have fun not seeing boost until 5000 rpms.

Turbo'dSS

iTrader: (2)

Yeah i knew that the GT30 was laggy when btf made the kit. i wasnt sure if the GTX series wheels would help with that issue or not? Ill prolly end up getting the BNR stage 2 once i see the numbers. it will prolly have a way better spool time also. I was just curious about it thats all.

slowbalt84

oh im sure the GTX wheel will help SOME, but its a waste of money on the stock manifold. For $325 you can get a custom exhaust manifold from vulcan turbo and call it a day. I really don't know why more people havent done more custom turbo kits on their ss/tc. I have about $900 into my turbo kit which is precision 5457 turbo, O2 housing, custom exhaust manifold, and oil/coolant lines. These BNR turbos do sound pretty interesting tho and Im positive they will be great, i just dont want spool up so fast. Plus i want well over 400whp

SKY888

I'm not sure about that.....


I am using the stock exhaust manifold with BTF's GT3582r and full boost (28psi) at 4400rpm....which is not bad for a 2 liter engine

SKY888

I spoke to the garrett techs at SEMA....and they told me that the GTX will not spool any faster compared to the GT-R series.

The advantage of the GTX turbos is basically higher top end power (10% more) compared to GTR.

So basically, a GTX3071R turbo will spool like a regular GT3071R turbo...........but the top end power will be similar to a GT3076R turbo.


on the other hand, the Borg Warner EFR turbo's due to their "gamma ti" turbine wheels which are 50% lighter compared to a regular turbine wheel....results to a 1:1 turbine/compressor weight ratio......which makes that turbo have a faster response compared to BB turbo. A regular BB turbo is around 2.4:1 weight ratio.

Terminator2

This is very true. The stock manifold with its divider is designed for swin scroll turbos only. The split manifold increases exhaust gas velocity over the turbine when used on a twin scroll turbo. When you use a split manifold on a regular single scroll turbo the exhaust gases are essentially doing work on opposing areas of the turbine which leads to lag, surge, and lack of power because a GT35R at 26 psi should make ~500 whp on pump gas on our motors.

turbo_chevy_cobalt

That to high of an rpm for me lol. I thought u would make more power at 28 psi and having a bigger turbo then i did with a 2871 at 26psi. With the old 2871 i hit full psi around 3600 to 3800 rpm.

SKY888

SHOULD is the word.

Unfortunately, HPT doesn't have the tables needed to get things right

I think, if I go with HPT-trifecta combo, 500 whp will be achievable.

really no need to go 500whp, on a stock block since I'll just ruin stuff.


Plus a RWD car (SKY) gets more drivetrain loss compared to FWD cobalts.


I'll do everything right this time around on my current build. Use Trifecta-HPT combo, and add Port Injector/secondary fuel rail/4 - 60s injectors. Hopefully that will be enough fuel delivery..... but we'll see. We're all playing on unchartered territories

Lots of things to discover, and see what are the limiting factors......

SKY888

I was hoping for more whp too, trust me! lol!

BYT*SS*TURBO

iTrader: (6)

E in full effect, car is loving it compared to the 91. Picked up almost a full second 60-100 with a couple revisions. Getting close

Terminator2

Stock mani will limit power as well on that type of application.

Terminator2

What was the 60-100 time before and now?

SKY888

Im really hoping that an aftermarket exhaust mani is one of those limitations.


although he's not manual, "project scarab" has a solstice gxp with an aftermarket tubular exhaust manifold, bigger turbo, GM race block, headwork, valves, water/meth, etc...........even at 28-29psi.....is struggling to get 450whp. I think he's around 400whp, right now.

They have been tuning it, but the bullseye turbo, broke.

I'm surprised that the aftermarket tubular mani he has....didn't really give him the power I was expecting.

Although, they're not FINISHED with dyno-tuning.........

I'm still hoping that he gets 500whp tho......

SKY888

have you dynoed your car yet?


this Ethanol thing...is very interesting!

BYT*SS*TURBO

iTrader: (6)

Just over 5 secs on pump (this is including some spool up time tho, still stabbing at 58ish and takes a second to pick up). And just over 4 with the last revision. If he did a pull from just under 55 and I took the measurements at 60-100 it would be more impressive but we call that "cheating" so Im keeping consistent!

I could only run like 13 or 13.5* peak on 23psi with the 91 octane. We're over 20 now but Im taking it a bit easy moving it up and keeping an eye on things

BYT*SS*TURBO

iTrader: (6)

We're still dialing in the car on the E. This is like the 3rd or 4th revision and its coming along nicely, quickly.

If he's down to dyno I will block some time off to sit by the PC and send updates

tglems

iTrader: (3)

Yeah, I looked at the last log and it looked like I went WOT right at 60mph, so it took a little while to spool up. I may have to do one from 55 just for the fun of posting that time, heh.

BYT*SS*TURBO

iTrader: (6)

Its gotta be feeling good compared to before, def looking very strong!