GMT stage 1 or 2

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.

Z eliminator

So if ran a stage ! on my car and shifted at 6500 rpm my feeling is that it would beat the stage 2 in the 1/4 mile.
Look at the diference in torque and rwhp. it huge up to 6500 rpm.
we are just going to have to wait to see what my stage 2 will do in the 1/4 mile with the 4.08 gears.
What would it make with a meth kit (stage 1) ? i guess would be 450 rwhp
Z

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travisjb

^ from 5k to 6.5k rpm, it looks like an avg ~15 whp difference favoring the st1 over st2 for this particular configuration on these cars at the times they were run. of course the st2 will be tunable to higher #s... and the st2 is on average ~15 whp higher than the st1 from 6.5k to 7.5k... my guess is it would be roughly a wash with these two cars as they are set up, assuming they both shift at redline

in addition, i like the very linear acceleration that is likely to result from the st2, all the way to redline it should pull like a bmw

only downside for me with the st2 is power/weight classing based upon peak power! I think I may put a rev limit in of 7k in order to meet my target

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Nixlimited

Oh man, if there really was a stage 1.5, that would make my choice way more interesting...

Looking at those dynos though, Mike, would you say that the current stage 1 compressor side is maxed out? It really falls flat after 6500 RPMs.

Man, this reminds me a lot of choosing a turbo for my STi ... big versus little.

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sojirovskensi

there is such a thing for s/c 1.5, i talked with Mike about it

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prescott3656

I'd like to see the difference on the stage 1 after the stage 2 compressor housing upgrade...

m4a1mustang

Great post wind.zero

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Streetlife

I agree, his post was as informative as it can get for those thinking about FI.

roplusbee

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GUTCH

Here's a question some of you might hate but it means the world to me:

0-62mph & 62-95mph

Stage I or Stage II?

Oh and if the result it that one kit is better for one of the above speed ranges than the other, I'm going to bang my head against a wall until it bleeds.

GUTCH

So let me clarify the above question by saying that all other variables such as traction, driver, etc are constant.

Now what do you all think?

weiboy718

Agree! Someone should sticky that post before it gets buried.

sojirovskensi

I was lucky that I had a chance to get a ride with wind.zero's car about 2-3 weeks ago.
Once the car launched, first 1 second it goes like my z (310whp), but I could feel a great torque kicking in around 3.5~4k rpm. He did a couple of 40mph starting, and this time it was a totally different feeling from the beginning since he could launch from above 3500 rpm.
Throughout the first and second gear, I could hear somewhat unpleasant sound of S/C, but it was not that bad. I am sure that I will get used to it just like road noise from the stock 370z. Breathing sounds are awesome. I personally like it more than bov.

It seems very fun to drive as well as fun to ride in the passenger seat.
We were literally laughing all the time during the drive.
For those who may think S/C don't have enough torque to put you deep in the seat, but it was not true. It was as fun as a turbocharged car to me (like stock Evo/sti)

Overall, it was a great experience for me to decide to go with S/C stage 1 later on. I was debating between S/C and TT both stage 1, and I was very concerned of torque rather than horsepower. For me, who don't really go to track, S/C stage 1 will give me enough power to put a smile on my face.

It is very true that you will get used to the power within 2-3 weeks anyway.
For instance, I have a friend who used to have R35 HKS 600 kit with 650 awhp, and recently he is done with HKS 800 with 4.2L engine upgrade which now makes 960 awhp.
After 10 days of driving, he is thirsty of more power.

The point here is that, you will feel like wanting more power anyway.
Think of what you need your car for, but personally, s/c stage 1 sounds enough for me as a DD.

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