In-House GTM Stage 2 SC Install\Tune
 

We had the opportunity to get our hands on the new GTM Stage 2 SC Kit. The great thing about the kit is that its very quiet not like your typical Vortech units and the way Sam@GTM has designed the kit you can't even see the blower with the hood open. Making it a much slicker and sleeper look. We suggested a larger pulley to keep boost down to a very safe level. However Kevin's already thinking about having us install a smaller pulley to make 9-10 psi! While we were at it we also added GTM's AT Trans Cooler and Engine Oil Cooler to work with the SC kit.

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We installed the kit on Kevin's 2010 G37S Coupe AT. Kevin already had an Invidia catback to add to the mix of mods. We added a set of Fast Intentions HFCs since his ART pipes wouldn't clear the new larger tranny cooler fittings and lines.

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Nissan\Infiniti has made it hard(er) to service their automatic transmissions. I can see how this would prevent the regular guy from using the wrong fluid and protecting the trans. This is where you fill and check the fluid. No dipsticks here! Sorry Jimmy.

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power looks nice and smooth!

Nice. What fuel upgrades come with this kit?

I love everything about this kit but the air filter location. I really like were the air filters are located on their TT kit.

I should probably do this since everyone at the track always assumes I am FI already.

This is an Auto G37 correct?





DAN

Walbro 255 lph Fuel Pump

Dedicated Fuel Pump Relay

650cc Fuel Injectors

Very simple and clean.

Yes sir, a 7AT.

looks great!
am I the only one who thinks torque is little bit low relative to power?

Final numbers with 463 whp , 335 tq and I'll let Seb explain the tq

It's proportional to other cars for example:
http://i313.photobucket.com/albums/l...Graph1copy.jpg

Over 40 more whp and it makes 35 more torque.

hmm, from the sticky (FI built) I see many members made 400/340 ratio with SC stage 1
Do G37 make less torque than Z?
Or is it because 7AT?
No offense but just curious :)

The Stage 2 blower makes less torque than the Stage 1 units. Somewhat of the same principle of comparing a small turbocharger to a larger one. Sam was kind enough to let me drive a Stage 1 370Z and is definitely more responsive and torquier.

Take a look at Sam's Stage 2 press release and you'll see the torque differences.

I really appreciate your kind explanation!
I will take a look at it again. I remember seeing it but did not really pay attention to the torque.

No problem!

If anyone is on the fence about the GTM SCs they are fantastic high quality kits that deliver on every aspect of how a proper F.I. kit should be. Quality, performance, and reliability.

Nice #'s, your only running 8.5 lbs of boost?
im hoping to run mine at 10 .
Thank you for posting a 7 AT, dyno

Z

So if the Stage I SC has more torque than the Stage II SC, does anyone care to have an educated guess as to which would be quicker from 0 to 62mph?

Why 62?

0-62 is the standard 0-60 test. All the articles in magazines and shows on TV just say 0-60 because it sounds better than 0-62.

Found this on the interwebs, http://en.wikipedia.org/wiki/0_to_60_mph

"The time it takes to accelerate from 0 to 60 mph (0 to 97 km/h or 0 to 27 m/s) is a commonly used performance measure for automotive acceleration in the United States and the United Kingdom. In the rest of the world 0 to 100 km/h (0 to 62 mph) is used. Present performance cars are capable of going from 0 to 60 mph in under 6 seconds, while exotic cars can do 0 to 60 mph in between 3 and 4 seconds, whereas motorcycles have been able to achieve these figures with sub-500cc engine for more than 20 years. The Bugatti Veyron Super Sport is currently the fastest production street legal car to reach 60 mph from a stop, reaching the speed in 2.46 seconds."

OOooooK...:tiphat:

Faster lap times for yea.

I wonder if I can get over 400lbs or torque..

That would be nice. Even 385 would be a blessing

Any ideas on how to get a larger torque number?

So my question above kinda got swallowed up in that 0-60 Vs 0-62 explanation. Anyone care to take a stab at it? :ugh2:

It runs anywhere from 7.5 to 8.5 psi on the average. It's impressive how responsive these engines are to small increases of boost. Good luck with your project.

Im guessing its partially to the high compression ratio?

Higher compression can help get response up but the main reason for the responsiveness to boost is the engine design such as the heads (port size\flow), cams, VVEL.

I'm surprised that your setup and GTM's setup are looking at a 40whp difference considering you guys also use a dyno jet? Is it because you guys didn't push more than 8.5psi? Did you guys not feel comfortable pushing it to 10psi? Considering that UpRev allows for multiple maps why not set one map as the safer daily use and one aggressive map pushing to 10psi? The user could switch whenever he wanted.

SC boost levels aren't easily switched like that, it requires physically changing the pulley on the SC assembly.

I have the larger pulley installed, once I go to 9+ psi we should se a dif.

7.5 - 8.5 made 35+ whp.

Great! I know its been mentioned by GTM that swapping out pulleys is a pretty simple task. Do you find that to be true? If their SC kit can get 500whp that would be amazing.

Yes, swapping pulleys is straightforward. Making more power isn't the issue (with the right pulley). It's the life of the stock 7AT that starts becoming an issue at level near and past 500whp.

The gtm kit can make 500whp. There's a few out there. Only one auto barely pushing 500whp

Any additional benefits to be had by going with a more intense fuel system and running e85?

You can run higher boost 11+ psi and timing with E85 since it's a higher octane fuel. You will need to supply the engine with 30-40% more fueling so you will need two Walbro fuel pumps and close to 800-1000 cc fuel injectors.

Yeah I discussed the pros and cons with another member on here. Phunk is running e85 on his Greddy TT setup. Even if e85 was used, wouldn't 11+ psi go above and beyond current stock internal capabilities?

Yes, it's possible. Here's a graph of the Stage 2 with a smaller diameter pulley making 400wtq. Notice that the pull ends at 6200rpm because we stopped the pull...we were making 14psi of boost which was more than we wanted to make. The stage 2 is a real powerhouse once you start spinning it up.

Normally, we ship the Stage 2 with a 92mm pulley that is good for 500whp on 93 octane gas. Kosstick wanted less power and got the 96mm pulley instead.

http://i313.photobucket.com/albums/l...no27000011.jpg

^ Noice

wow. Just what I want.