GT Motorsports: 370Z Supercharger system development

nixxer

Assuming 8 psi is a safe boost level, long tubes and catback may produce more power than some people are figuring. At 5~psi on stock cats and exhaust those are nice gains. I would immagine a full exhaust would get close to 400 whp at 5~ psi. Looking foreward to more updates and results. Also, is it a recirc or open setup? My guess is recirc.

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SAM@GTM

8 psi is a safe boost level even 9 is not a problem, we have been running our turbo system up to 10 and 11 psi without any issues. the system runs a recirc set up but it was open on this dyno run

Sam

tcarretti

Sam,

Is that a base model on the dyno? I am really interested in the SC kit as well, but didn't know if the stock open diff would or could handle it. I'd like to switch out the diff at some point after some solid choices come out that are verified fits.

Thanks,
Tony

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simota1

i think i jus drooled a lil!!!! haha this is awesome update

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NYBladeZ

9-11lbs plus a full 2.5 exhaust will hopefully put the Z around 450ish if not more with a pulley. If that's the case and it was that much low end torque I'd be inclined to say that a stage 1 SC> stage 1 TT.

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2009 Carbon Fiber/Red 370z aka Trish: Sports Package, Meisterschaft full catback, Fast Intentions Longtube Headers, Injen Long Tube Intakes, UpRev Tune: Sold
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LiquidZ

The torque curve looks great.

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kdoske

This is why I love super chargers. Everyone wants a turbo with 500+ power. Thats great and all but unless your a track junkie all that highend HP is wasted and not utilized. These power curves will create a more fun daily driver then any high HP turbo setup.

Buddy Revell

Then again, check out the torque curve of Greddy's 370Z TT kit at less than 6.5 psi.
Welcome to the official GReddy USA blog: 450whp Tuner Turbo Kit for 370Z coming soon!

RCZ

344 @ 5psi in the charts.
400 @ 4.5psi in the video.




If its flowing higher, that just means it doesnt need to spin as fast to produce the same boost. Just because a turbo is bigger, doesnt mean theres more air in 5psi than there would be with a small turbo. Less stress on the turbo yes, more psi in the psi, no.

So "obviously" that's not why. I think the numbers that were throw out there by Z eliminator are pure speculation. I dont think it made GTM look good either. Stage 3 @ 10psi only making low 400 when their actual stage 1 kit is already making 350 @ 5psi.

Wtf is going on here folks? I'm not hating here, but these things aren't making GTM look good for me. I know they are a good company, this isn't necessary or needed.

CBRich

Just guessing here but if you look at the baseline dyno and take the drivetrain loss of that times 400 you get exactly 344.

Buddy Revell

400 to the flywheel is about 344 to the rear wheels.

rackley

I don't really know anyone who quotes flywheel HP except perhaps the manufacturer... It's rather misleading.

But yes you're right. Thanks for the "flowing" debunk. Assuming you don't have a closed throttle plate in one of the I/C tubes and you're pumping into the same engine, 5psi is 5psi is 5psi. It's putting the same number of oxygen molecules into the chamber.

With regards to sizing, a smaller SC or turbo has to work harder (spin faster) to make it, which would cause more parasitic losses, but the same amount of air is going past the intake valves into the combustion chamber. The whole "flowing more" is really misleading because the air isn't "flowing" any faster or harder.

Silo

No, it's NOT dude... 5 psi might be harder to imagine, so lets go to 20 psi. A GT25 at 20 psi is far less "efficient" then a GT35 at the same psi. Efficient means, that on the same engine the GT25 has too spin a lot faster then the GT35 to produce 20psi of pressure causing the compressed air produced by the GT25 to be much hotter compared to that of the GT35, which in turn means that there will NOT be the same number of oxygen molecules in that chamber!

rackley

Yes, temperature is a factor too, but I was assuming a system with an adequately sized intercooler and boost measured post-IC, which is usually is, as it is in the GTM system.

Exactly (with the exception that we're not talking about turbos or backpressure here). Volumetric efficiency of the compressor wheel. More efficient = less energy wasted = more power for the whole system. That much is very obvious. But it's not what I was talking about. I was talking about the amount of air entering through the throttle body into the combustion chamber at 5psi (at a fixed temperature). Small picture, not big picture.

Buddy Revell

If I'm not mistaken, all of Vortech's hp figures for their sc kits on their website are at the flywheel.