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

bullitt5897 · 10-06-2009, 09:23 AM

Quote:

Originally Posted by DeadZero

Here is my Very First post to the forum. And this is a question that has not been asked about your twin turbo kit so far... i did search threw all the pages and didn't find this answer.

Sam, is it possible with the twin turbo kit to be able to have 2 different size turbo's? One for the quick spool and low-mid range power and a larger turbo for mid-high range power?

Kinda like a gt28 and a gt35r set-up??

i'm not a noob with turbo's, i've met you a few times with 2c. I also used to have a boosted s2000, but unfortunately it was totaled in a horrible accident and i am going to be salvaging all my parts to buy a 370z within the next month or 2. and the first order of business i'll be having with you is to install this kit.

But for the time being, i'm curious what the options are, if it is possible 2 different size turbo's are available, if not. what stage would you consider to be if i requested Twin Gt30's

Thank you

- Chris

Chris,

Just so you know a Twin turbo kit like the one GTM is offering needs equal sized turbos. Here is one of the many reasons why: Each turbo powers one side of the block i.e. turbo A runs off the right bank of engine exhaust gases and Turbo B runs off the left bank of exhaust gases. Having a staggered setup like you suggested would end up with one side of the engine fully exhausted while the other side would not be fully utilized. So in Lamens terms turbo A would be at full boost while Turbo B would not causing the right bank of the engine and turbo parts to receive much more wear and tear than the left. Not to mention that this would negatively affect any power you make as well as be a complete B*tch to tune!

Like I said there are TONS of reasons why this would not be a good idea... And many on here could correct me and elaborate further on the subject.

As far as your GT30 question goes I would say a stage 3 or 4 should do the trick! but remember you have to be able to feed this puppy too! so their stage 4 or 5 fuel system would probably be your best bet!

Good Luck

G37Sam · 10-06-2009, 10:16 AM

Quote:

Originally Posted by bullitt5897

Chris,

Just so you know a Twin turbo kit like the one GTM is offering needs equal sized turbos. Here is one of the many reasons why: Each turbo powers one side of the block i.e. turbo A runs off the right bank of engine exhaust gases and Turbo B runs off the left bank of exhaust gases. Having a staggered setup like you suggested would end up with one side of the engine fully exhausted while the other side would not be fully utilized. So in Lamens terms turbo A would be at full boost while Turbo B would not causing the right bank of the engine and turbo parts to receive much more wear and tear than the left. Not to mention that this would negatively affect any power you make as well as be a complete B*tch to tune!

Like I said there are TONS of reasons why this would not be a good idea... And many on here could correct me and elaborate further on the subject.

As far as your GT30 question goes I would say a stage 3 or 4 should do the trick! but remember you have to be able to feed this puppy too! so their stage 4 or 5 fuel system would probably be your best bet!

Good Luck

I wouldn't totally agree on that, as the intake manifold (plenum) does not have any sort of separation and basically boost coming from both throttle bodies mixes in there

Equinox · 10-06-2009, 12:19 PM

how would you have two seperate MAFs and TBs but the intake manifold plenum is not seperate?

LiquidZ · 10-06-2009, 12:39 PM

Quote:

Originally Posted by Equinox

how would you have two seperate MAFs and TBs but the intake manifold plenum is not seperate?

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.

G37Sam · 10-06-2009, 12:39 PM

Yes, but there is no seperation in the plenum in order to equalize air flow entering both banks in order not to hurt the engine

Equinox · 10-06-2009, 12:52 PM

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?

LiquidZ · 10-06-2009, 01:03 PM

Quote:

Originally Posted by 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?

Maybe this design allows for a greater plenum volume?

G37Sam · 10-06-2009, 01:19 PM

Quote:

Originally Posted by 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?

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

GingaBreadMan · 10-06-2009, 09:32 PM

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.

TARDCORE · 10-06-2009, 09:58 PM

Quote:

Originally Posted by 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.

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.

B1nks · 10-07-2009, 08:09 AM

Quote:

Originally Posted by 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.

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 !

DeadZero · 10-06-2009, 01:06 PM

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

1slow370 · 10-09-2009, 07:43 AM

Quote:

Originally Posted by 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

Also it's called any supercharger that isn't centrifugal(boost ramp) or hey just a bigger motor your looking for postive displacement.

zman1910 · 10-06-2009, 10:03 PM

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 · 10-06-2009, 10:08 PM

Quote:

Originally Posted by 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

lol doesnt mean people still dont make it an excuse.

10-06-2009, 12:19 PM	#3 (permalink)
Equinox Track Member Join Date: Jul 2009 Location: Beaumont, TX Posts: 685 Drives: 06 Porsche Carrera S Rep Power: 18	how would you have two seperate MAFs and TBs but the intake manifold plenum is not seperate? __________________ Check out my Albums '13 Subaru WRX STi \| '06 Porsche 911 Carrera S (SOLD) \| '96 Mazda RX-7 6.0L V8 RHD (SOLD) \| '09 Nissan Nismo #0058 (SOLD)

10-06-2009, 12:39 PM	#5 (permalink)
G37Sam A True Z Fanatic Join Date: Dec 2008 Location: Dubai, UAE Posts: 1,507 Drives: RB'd G37 Rep Power: 21	Yes, but there is no seperation in the plenum in order to equalize air flow entering both banks in order not to hurt the engine __________________ '14 Viper GTS '08 RB'd G37S - Sold

10-06-2009, 12:52 PM	#6 (permalink)
Equinox Track Member Join Date: Jul 2009 Location: Beaumont, TX Posts: 685 Drives: 06 Porsche Carrera S Rep Power: 18	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? __________________ Check out my Albums '13 Subaru WRX STi \| '06 Porsche 911 Carrera S (SOLD) \| '96 Mazda RX-7 6.0L V8 RHD (SOLD) \| '09 Nissan Nismo #0058 (SOLD)

10-06-2009, 09:32 PM	#9 (permalink)
GingaBreadMan Enthusiast Member Join Date: Jun 2009 Location: New York Posts: 313 Drives: 09 370z Sport 6spd Rep Power: 16	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. __________________ ClearBra/Debadging/Tinted Head & Taillights Coming Soon:180° Customs Headlights/ISS Forged Spyder 19" 265*305/Swift Springs/STS Rear Mount Turbo

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10-06-2009, 01:06 PM	#12 (permalink)
DeadZero Base Member Join Date: Sep 2009 Location: Huntington beach Posts: 20 Drives: Currently a Mirage Rep Power: 16	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

10-06-2009, 10:03 PM	#14 (permalink)
zman1910 Enthusiast Member Join Date: Nov 2008 Location: FL Posts: 361 Drives: 2011 Audi S4 Rep Power: 429	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

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