GT Motorsports: 370Z Stock block testing, and turbo system development

LiquidZ

If I understand what you are asking, I think the reason is quite simple. Air is coming from two different locations through two ITB's and into a common plenum. In order for the ECU to know precisely how much air is flowing into the plenum and into the combustion chambers, the airflow needs to be measured through the two points of entry via two MAF sensors.

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Equinox

then what is the point of twin TBs and MAF's? Wouldn't they just do like a vette motor and just go big single?

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LiquidZ

Maybe this design allows for a greater plenum volume?

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DeadZero

Good question huh??? hahah it would have been an interesting project if it were possible. To have the perfect power-band..making power all over the place. thank you for the responses guys. I am doing this research the right way to do this project right way the first time.

-Chris

G37Sam

Would you rather have one big single turbo or two small twins?

I'm guessing twin TBs and MAFs allow for better air flow and response

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GingaBreadMan

At what rpm do the turbos kick in? And would I be able to program them to kick in at rpm's that I desire? For example one at 2k rpm and the other at 4k rpm. I'm looking for power thru the entire power band.
Pardon me if the questions are dumb.

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TARDCORE

you wouldnt want that. You would want them to kick in ASAP and achieve full boost asap. You ever hear people complain/make excuses (lol) about turbo lag? thats why.

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zman1910

Lag is a problem of the past......the newest turbochargers are ridiculously efficient, especially with the VQ engine. I would expect to be at full boost under 3500rpm's

TARDCORE

lol doesnt mean people still dont make it an excuse.

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DeadZero

what i'm really curious about is whats the limit on these motors. I'd like a safe 400 low boost setting and possible a mid 500hp high boost setting. Safely on a stock block.


Has it been discussed about lowering the compressions on these motors to 9:1???

B1nks

Yeah but if you lowered the compression then you'd have to up the PSI which would equate no differently on the stress put on the motor to achieve the same horsepower. 400 is easily done on stock block but mid 500 you probably would want to start to secure your investment more.

B1nks

Yeah on the GTM TT kit I wanna say the graph I saw(if i remember all this correctly) showed the turbos going strong at 3-3500..which is good enough for me !

LiquidZ

If I had the money, I would maintain the stock compression with a forged roatating assembly and stick about 10 psi into the combustion chambers.

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Zguy

I think what he was trying to say with the unequal sized turboes is running the 2 exhausts into a Y pipe that would feed into the smaller turbo to spool up a larger turbo that would in turn be fed to a one inlet 2 outlet IC and on to the TB's and plenum...... I have always wanted to try it because in theory it would work but as far as if it would be cost efficient that is what I dont know. Having a small turbo that spools quickly would still push boost into the plenum then once there was enough pressure the large turbo would spool I guess theoretically you might be able to have boost through out more of the power band. Who knows lol

LiquidZ

GTM, have you guys conducted any testing to see how the turbo impacts oil temperature?

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