GMT stage 1 or 2

m4a1mustang

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Kirkster

Have 12 K on mine since I installed the GTM kit. Still running strong, only issue I have had is a boost leak that turned out to be a coupler that was loose. 10 minutes and fixed.

Mine is a DD of 100 miles +

K

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Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

Footloose301

How much boost are you running? I plan to do 7-8psi daily....

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2010 40th Anniversary 370Z

Mkai0

Kirkster,

how much boost did you lose when you had the leak?

tomnavone

If I could do it over again I would go stg2. Even tho the press release for stg1 says power expansion is a simple 20 minute pulley change, I was informed by sam this isn't true and stg1 kit is already maxed out. 400hp is fun but I'm sure 500hp is a lot more fun

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Mike@GTM

To say that the Stage 1 Kit is maxed out isn’t exactly true.

We designed the Stage 1 kit with certain goals and it is exactly what we wanted it to be. We wanted a responsive system that has a clean under-hood appearance and we built the system around the car.

The thing that people often forget is that engineering is the art of balancing science with practicality and cost.

Practically, it is not possible to make a supercharger kit look as clean as ours and not modify the car in some way to achieve maximum power (other than adding brackets of course). The Stage 2 Supercharger Kit has that ability because it requires the use of polyurethane motor mounts specifically designed to give enough clearance to have an intake system that optimizes airflow into the supercharger.

The Stage 1 on the other hand had a parameter that had to be accounted for: have as little impact on the car as possible. That meant that there were some compromises we had to make and there were actually some advantages that came from those compromises. The Stage 1 is very responsive because the intake is not as optimized as the Stage 2 and must be spun to high rpm to make our power goal for the kit.

There is a brand new Nismo that we just got here in the shop that is getting our Stage 1 Supercharger kit with the Stage 2 compressor housing and intake. We’ll just call it Stage 1.5 for now. The results will show that the C38-81 supercharger unit is NOT maxed out in terms of horsepower.

It is true that our Supercharger kit allows the pulley to be changed easily. I did notice that the original wording in our press release might be interpreted as the Stage 1 supercharger having more power potential than supplied with a simple pulley swap. Well, with everyone and their brother wanting eleventy billion horsepower for $5 we eventually caved and put the smallest pulley on there that could be run safely. That said, I’ll edit the website and press release to make it less confusing.

Ultimately, however, the Stage 1 has a lot of area under the curve...even if it doesn't make as much power as the Stage 2.

Kirkster

I am running 8.5psi in the summer and 9.8psi (10.3 max psi that I have seen) since the temps dropped below 55°

My boost would not go above 5.5psi with the coupler slipping partway off of the intercooler input. So roughly 3psi

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Powertrain Warranty voided on 5/14/2011
Mod List:GTM Supercharger,SmartTop module, Oil Cooler, GT-R Start button, Nismo Exhaust, BC Racing ER Coilovers, Backup Camara
For eastwest:

weiboy718

^ how the hell do you make 9-10psi on the stage 1 kit? The most I made was 8.4 and sometimes it won't even get to 8psi.

travisjb

Mike or someone, please throw a link up here where the dyno plots for the S1 and S2 are posted... for those too lazy to search thx!

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2009 370Z #104
*For Sale*

Nixlimited

Speaking of which, it would be great to have a posted STG 1 v STG 2 dyno plot to assess differences in area under the curve!

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Car Sold! Pleasure being a part of the Z community.
New ride: 2015 GT-R - 647 WHP / 641 WTQ (e85) & 543 WHP / 519 WTQ (91)

travisjb

^gee, good idea! :P

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2009 370Z #104
*For Sale*

shumby

i CAN GET 7.7 OUT OF MY 6.5 PULLY IN THE WINTER

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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

Mkai0

Interesting, the most I've seen on my HR motor is 9.5 lbs with the smallest pulley GTM has available for stage 1(84mm).

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Mike@GTM

Ok. Let me first preface this with something EXTREMELY IMPORTANT. You cannot simply grab a dyno graph of two different cars and expect to get 100% meaningful results. Here's why: EVERY CAR IS DIFFERENT. Some cars, even with the same exact setup simply perform better than others. These two cars in this graph are what we consider "strong cars". If they were on a bell curve, they'd be one to two standard deviations to the right of the mean.

Manufacturing tolerances allow for a variance in manufactured components. Some cars take more timing than others. Therefore, you can't assume that your car will make exactly the same amount of power. Environmental factors and fuel quality also play a huge role in horsepower production.

All that said, onto the graphs. You can see here that the Stage 1 makes more area under the curve than the Stage 2. The Stage 2 will smoke the Stage 1 on the track, but the Stage 1 will feel better on the street due to all the midrange torque it makes. The Stage 2 will benefit greatly from more displacement/built motor/higher octane fuel because you will be able to decrease the pulley size and flow more air/make more boost.



Again, if you are looking for eleventy billion horsepower, go TT and don't look back. The supercharger kit is designed for the person looking to make decent power on a daily driven/weekend track car on a budget.

Notsud 13

in for the eleventy billion horsepower.