Stillen or gtm supercharger?

Mike@GTM

Considering that the Stillen Kit does not come with the 928 Impeller or a T-Trim it's comparing apples to oranges.

I was specifically addressing the comment regarding the base Vortech blower in the Stillen kit being bigger than the base C38-91 Rotrex blower in our Stage 2 kit.

In fact, my comparison of the Vortech T-trim we did in this thread: GT Motorsports: 500rwhp/455rwtq Vortech T-Trim, FCon VPro, GTM Built Engine - Page 2 - MY350Z.COM Forums is apples to oranges as well. The main point of me mentioning that particular build was to illustrate that the Vortech simply cannot handle spinning that high for very long. Remember, that car ended up going through 3 blower failures.

As far as the 928 impeller being better, that is an additional cost to the base Stillen kit and causes you to lose the warranty that Stillen offers. Even with the 928 impeller, the graphs speak for themselves:

GTM Stage 2 Supercharger Kit


Here's your graph from your thread.


Please don't take this the wrong way as I really commend you for pushing the envelope with the Stillen setup. Since you are the only person with the 928 impeller on a 370Z, I have couple questions.

1) Do you think it was worth going this route? Would you recommend it to other guys with the Stillen kit?

2) Are you maxed out with your setup or do you think there's more in it? The reason I ask, is I don't know what your impeller speed is at redline. How much more can you spin that blower?

Mr.Squeeze

Ok to answer your questions

1.I dont think it was worth it because the piston in cylinder #2 took a dump on me I am building my motor now. All other were fine showed no signs of detonation in any other cylinder. Also the price and out the box performance is another reason, my kit was used thats the only reason I have it now.

2.No I am not maxed out my impeller speed is 56000 rpms at red line. I can go to 60k with the impeller, the ABEC 7 bearings in the unit are rated to 59k. What may limit me is the design like it did on my first set up.

My first set up had issue's my MAF's maxed out way before red line 6700 rpm's. My boost was all over the place I know this killed my power.

Take a look at the boost log from my dyno graph as a example. As you can see it's up and down,had it been leiner without dips and maxed out maf's. I have no doubt that it would have made way more power.









The reason I made my first post in response to what you said about the blower.




For another apples to oranges comparison here is a Gintani the S65 engine has a very high volumetric efficiency.This proves that you can make power on a engine with high VE,what is holding th Stillen kit back is design.

Vortech. Gintani Stage 2+ "New" Dyno Results... - BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3)

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