STILLEN 370Z Supercharger System - Announcement!!!

Originally Posted by shumby

No problems he told anyone about. Funny his is the only stillen SC that was 100% perfect out of the box with no issues.

Originally Posted by shumby

No problems he told anyone about. Funny his is the only stillen SC that was 100% perfect out of the box with no issues.

Originally Posted by Phimosis

Stillen had problems with their tuning in the beginning, but those issues have been resolved and you see people posting, saying their their cars are running great now.

Originally Posted by Phimosis

RCZ got his tuned by an independent tuner that got it right the first time. Everyone else, except Lateral G'z, has used Stillen's tuning. Stillen had problems with their tuning in the beginning, but those issues have been resolved and you see people posting, saying their their cars are running great now.

So, what I'm predicting is that all the people that get their superchargers from Stillen from this point forward are going to have 100% perfect out of the box performance.

Originally Posted by Zsteve

So Stillens tuners arent as good as the independent ones out there? Kinda wierd. I would think Stillen could replicate an independent tune easy, so does that mean they are still trying things the independent ones arent?

Originally Posted by Phimosis

. And they did..... if you call 4 weeks 'pronto'. :-)

Originally Posted by Phimosis

The version of the Uprev software they are using is different than what Uprev sells to the public. It's a locked down version that prevents the user from changing any parameters.

It's set up so Stillen can change anything they want, send you the tune, then prevent you changing settings, burning your engine up and then blaming them.

What I was told is that Uprev designed the software a few years ago, but then never brought it to market because the demand wasn't there. So, it had never been widescale tested in a public release. When Stillen implemented it, there were some factory settings that they weren't able to over-ride, like injector dwell time on hot start. Then add larger injectors with stock dwell time and your mix is way to rich at start up, causing the hot start difficulty. So Stillen's engineers were trying to work around road blocks in a product that is different than the user-tuneable Uprev, which is why Uprev sent a programmer and a tuner to Stillen for a week, to fix the problems that Stillen couldn't.

Regardless, the issues are fixed. Taking jabs at Stillen's abilities isn't really fair, when the finished product works well. Everyone's beta version of any product has problems. Yes, they did release it to the public before it was ready, but there is a benefit to that too: Widescale implementation increases the number of people that report problems to you, rather than just a few engineers. In turn, that accelerates your product delevopment. Having people like me on the forum bitching about how their supercharger didn't work right lit a fire under them to get it fixed, pronto. And they did..... if you call 4 weeks 'pronto'. :-)

Originally Posted by Zsteve

so all kits are fine now that were tuned by Stillen??

Originally Posted by Osiris

No.



Planning on going to dyno once they finally fix mine....who knows when that will be.

Originally Posted by tomnavone

Im finally getting my car back with the new tune today standby for the results.

Originally Posted by tomnavone

Im finally getting my car back with the new tune today standby for the results.

Originally Posted by Phimosis

My only criticism of the setup is not with the performance, the workmanship or the customer service. The issue is that my car doesn't perform as well as Stillen's press release car. I'm running headers, hi-flow cats, exhaust, 9 pounds of boost (what I was told, but haven't seen the actual number) and using a 1:3 mix of race fuel and premiun unleaded, yet my car doesn't reach the hp or torque numbers that Stillen advertises on their car running 91 octane with 7.9 psi of boost and all stock, except cat-back exhaust.

If they had a press release and advertised 400 hp and 310 lb/ft of torque, I would have still bought the Stillen kit over the GTM because of Stillen's reputation, racing history and number of vehicles they have modified. I would have still went the supercharger route over turbos because of the lower cost, the simpler conversion back to stock (if needed) and lower risk for engine failure. I say lower risk of failure not because of facts, but from anecdotal stories about catastrophic engine failures on after market turbo cars in general, and that whenever you go to higher hp numbers, you have a higher risk for failure just from internal stresses. Then, after modding my car and getting higher hp and tq numbers than their press release, I would have been ecstatic. But.... Since they advertised these higher numbers, I have been disappointed every step of the way when my car comes up short.

After reviewing the performance of other Stillen customers car, GTM's customer's performance and through analysis and introspection, I've concluded that that problem is not with my car; the problem is with Stillen's press release.

Am I saying that Stillen made the numbers up and that the dyno run is not real? No. They could tune my car to squeeze more power out of it by advancing the timing and leaning it out a little. I'm guessing that their press release was a leaner, more aggressively timed tune, but not a tune they would feel comfortable giving to the public because of the sheer numbers of failures that would inevitabley occur due to the corresponding increase in cylinder temperatures from the lean mix and the material fatigue/cracking that would occur with detonation from the advanced timing. It's no big deal to run your test mule like that for a few weeks of dyno testing, but it is a big deal to give that tune to the public, where some people will be tracking their car, doing top speed runs and other stunts that puts the engine in the upper rpm range under full boost for long periods. A lean/aggressively timed tune under those conditions will eat holes in pistons, crack piston skirts, break wrist pins, spin con rod or main bearings, etc.

The details that I am skeptical of are 1) their car made those numbers with only 7.9 psi of boost and 2) That they intended the tune that developed 438 whp to be distributed to the public and sent for CARB certification.

I want to apologize to Kyle in advance, for posting this. I like you and I don't want to hurt your business. All the people at Stillen have have been nothing less than excellent in how they treated me. And, both the workmanship and installation are excellent. But, I feel obligated and somewhat honored to report the truth to the best of my ability and knowledge to the readers of this forum so they can make educated choices.

With all of that said, I am resigned to believing that no one is going to be able to hit numbers they posted in their press release, unless they do a custom tune with risky parameters.

Regardless, I am still happy with performance and the refined, stock-like manners of the car.

One last point to add is not related to Stillen, but centrifugal superchargers in general: I have never owned one, so this was new territory for me. Because the boost comes late, ie. upper rpm range, you only get those massive gains for half of the time that you are on the throttle. At the redline, the engine is going nuts. After the gear change and boost is down again, the performance is far inferior to a positive displacment supercharger. The result is that even though my car makes 422 whp (roughly 500 at the engine), it is not Z06 Corvette fast or GTR fast. It is more like base model Corvette fast. I had a Kenne Bell supercharged mustang cobra that made 375 whp and it felt just as fast as my 370z. It's a little disappointing because with 500 hp, I was expecting to be driving godzilla's little brother, but it just isn't. The solution would be to run the supercharger with an even smaller pulley and use an 8 pound waste gate so that boost comes on early, hits 8 psi early and stays at safe levels to the redline. I talked to Kyle about this and he said they've kicked the idea around many times over the years and even tested an older car with the centrifugal supercharger/waste gate design, but nothing has ever come to fruition because of cost and emissions regulations. So maybe as a stage II custom tune this could be accomplished with a $300 wastegate and a little machine work to make the port and mounting pad in the air intake?