GT Motorsports: 370Z Supercharger system development

stormcrow

As theDreamer mentioned, the trade down was due to the desire to build a car as a project. But, as far as expense goes, building/modifying the GT-R wasn't really an issue...the issue lay in the fact that most vendors were charging astronomical amounts for aftermarket parts that were either slightly superior to OEM or, even at times, inferior. GT-R owners term it the "GT-R tax." Couple that with the fact that the GT-R is extremely bleeding edge as far as technology goes and typical power adders do not work, it will be a while before tuners and developers can catch up and provide a solid foundation on which to build the platform. I didn't feel like being a pioneer or guinea pig.


How dare you harass the superior my350z.com mods?! Some of those boys are rather touchy. You should be able to read the links without having a membership or the ability to log in, though.

1slow370

as for rcz being a stillen fanboy.... Maybe you don't know this stormcrow but stillen has the most underdriven pulley, the second best gains in a catback exhaust, the only headers on the market for our cars, the cheapest oil cooler kit that cools oil, and THE BEST cold air intake for our cars. THis has all been proven multiple times by multiple people. Basically he is one of the few pwople on here that actually has a clue about what they are doing and try not to start fights in GTM's thread but keep in mind the new stillen kit is VERY different than the old one which had an undersized blower.

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stormcrow

We should start a new thread to debate Stillen products versus the world. This is not the place. I can tell you, though, that there is nothing new about the Stillen SC kit for the 370Z except for the fact that they ditched the Eaton roots blowers and went Vortech centrifugal.

The design, layout, and routing of multiple unnecessary water lines is still the same. The moving of key wiring harnesses and parts is still the same. The gawdy and poorly placed coolant resevoir for pre-cooler is still the same. The necessity of wiring and relays for the ECM and pre-cooler coolant pump is still the same. It's a mess. Honestly, every Stillen kit I have seen looks like it was R&D'ed in someone's backyard.

I have zero against Stillen. I have had plenty of their products. From camber/toe arms to front bumpers to sway bars to full bolt on supercharger kits. Some had issues, others did not.

But, let me point out that we are talking about the supercharger kit. None of their other products. The Stillen products that you mentioned above are more for N/A cars than F/I cars...especially underdrive pulleys and headers. Again, Stillen makes some fine products. But, given the choice of the GTM SC kit or the Stillen SC kit, those of us with experience in the F/I arena would choose the GTM kit hands down.

travisjb

to your credit, this is definitely more specific and our posts crossed paths... I agree on a different thread - or just go to the stillen thread and post your thoughts directly there...

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2009 370Z #104
*For Sale*

Z eliminator

So how many of you guys are actually going to buy the GTM kit?
Yes i had a stillen on my 350, You would not believe what broke on it.
Yes i hurt my motor with it. In defence of stillen they did send me all the parts to fix it and yes they paid me for the labour that the dealer charged me to fix it.. I think thats its a great daily driver SC at 10 lbs boost on my ported M-62 blower, What broke on it . intercooler cooling pump, the pulley assembly drive shaft between the blower and the crank pulley. It only made 303 rwhp.
I have bought tons of parts from Sam at GTM ( 4.2 stroker) and when we spoke about the SC , i decided to by it because it looked like a 400 hp kit and thats all i need. 417 rwhp or more is a lot of power in a 370. Now add 2 more lbs of boost and you may get 446,
Do you guys know how much rwhp a stock GTR has. ( 417 rwhp).
Now we have car which is aprox 700 lbs lighter with the same rwhp, It will be handful to drive,
I call my GTM SC a poor mans GTR,
Its going to be a great drag race in the 1/4 mile.

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12.343 @114.14 . 4.5 stroker motor is now being built. Dec 1 2015.

shumby

Waiting with bated breath for the prtess release

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Originally Posted by SAM@GTM
Engine detonation is not normal and it should never never happen, and whoever told that need to do something else for living .
Sam

Buddy Revell

In case people somehow miss the press release thread, lol:
GTM Performance Engineering 370Z SUPERCHARGER KIT PRESS RELEASE

Phimosis

I'm in awe of the dyno numbers. That far exceeds my expectations for a s/c kit, especially with regards to low rpm performance of the centrifugal design charger.

The part that I am confused about is how do they get more power from a smaller displacment engine than the VR38DETT with less boost and using a supercharger vs turbo? At 420 rwhp that is roughly 500 hp at engine with 8psi boost, where the VR38DETT is 480 hp with 10.5 psi boost.

racerxj17

post up the compression ratio of the two engines....

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2009 PW Sport/Touring/Nav M6
Stillen Gen 3 Intake/CBE/Berk HFC/BC BR Coil over/Phillips 6500k/Hotchkis Sways/Stillen oil cooler/B&M SS

jmlenz

I believe the VR38 has been vastly under rated from the factory as well. Thought I read somewhere the true bhp, based on AWD dyno pulls is in the 550 range?

stormcrow

Actually, the VR38DETT was rated properly from the factory. Depending upon what day/dyno you are on, you will net anywhere from 390 to 420awhp. Given the fact that drive-train loss is not a singlular calculable number, there is no real way to measure flywheel hp without an engine dyno. But, best guess numbers were around 480-490 crank horsepower.

The tune and restrictive stock exhaust is what caused the differences in power. Keep in mind that the GT-R has four cats. Two as "down-pipes" and two in the mid-pipe. Very restrictive. Timing in the factory tune was pansy, as well. Merely adding a mid-pipe sans cats and changing the timing would net 30-40awhp. Up the boost three psi and you were looking at nearly +80.

Gmendez

Sam, I have not seen anyone ask about the clutch/PP holding up to the various stages. In your opinion, is there any need to upgrade for any of the stages?

Also, what do you anticipate (from a hardware perspective) the changes to be from stage to stage?

Thanks!

NYBladeZ

way to bring back a dead thread. You're going to want to upgrade your clutch/flywheel however I'd wait, reports are coming in that the weak point is the master clutch cylinder and no one has released an aftermarket one just yet.

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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
2008 Lotus Exige S Club Racer aka Bella, always leaves me smiling

LateralG'z

See the latest one from Bee, he will hopefully post some photos of the damage

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2010 Mag Black, 6MT,

elperuano