Preparation for the STILLEN supercharger

cotizi

"Obviously it's above 4 pounds and below 10" (4+10) /2 = 7 psi. Done!

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Past - 2009 Silver 6MT Sport 370Z
Current - 2012 VW GTI 6-Speed

kdoske

PSI averages, awesome!

stormcrow

Kyle, as much as I appreciate your candor, I still cannot grasp the reasoning behind not stating the actual PSI used to reach 422whp. I, as probably does everyone else reading this thread, understand that the boost level used to reach this number may change with the release of the kit. Whether it goes up or down in the production kit isn't as important to me as knowing what PSI was utilized to create the dyno posted in this thread. Again, I cannot fathom any legitimate reason (but, I can certainly think of plenty of illegitimate ones) why this number has not been posted. It truly does leave those of us (well, at least myself...I hate to speak for others) on the fence about which kit to utilize wondering what Stillen has to hide.

If you can give me a logical reason for waiting for the press release to state PSI after having posted a dyno chart, I will be satiated. Until then, I will probably continue to pose the same question over and over again.

And I understand this is a Stillen kit. But, you quoted another member here on their reasoning behind why 10psi would not = CARB legal. I see this as you insinuating that this is the reason why 10psi or better was not used to reach the horsepower shown in the posted dyno. I am not comparing your kit to the Vortech kit. I am merely stating that 10psi can pass CARB and I honestly do not buy that your dyno pull posted was done on anything less. It it was less, it was certainly more than 8psi.

The reason I am so verbose in my questioning is due to having been promised the world by Stillen salesmen when I researched and purchased one of your SC kits for my now sold Pathfinder. What I was sold and what I received were two completely separate items. Not physically, but in quality and performance. Having been in this game for quite some time, I am looking for complete transparency from vendors.

Speaking of tranparency, keep in mind that whatever PSI is posted in the 'Press Release' will have to reproduce 422whp all day long or people will feel duped.

Kyle@STILLEN

There are a few reasons why we have not released what PSI that test was at. The primary reason for releasing the dyno without boost numbers to follow was simply to show the capabilities of this kit without even pushing it hard. I assure you, that dyno was performed at less than 10 psi.

The main reason we do not want to release a horsepower figure in relation to a boost level is because the car we were testing on (G37 auto trans. with large 20" show wheels) was less than ideal. We are currently in the process of switching the kit to the manual gearbox 370Z with stock wheels which should be improved due to its more efficient drivetrain. It is very possible that running less boost on our Z will produce the same numbers that we saw on the G and people would say but wait...the horsepower is the same but your boost is lower...So, rather than having any confusion at all, we are switching to the more efficient car and from here on out will stay with the Z.

Also, that was a prototype run...Look at the date on the dyno, that was back on the 19th. Since then we've changed our prototype charge pipe and a few other pieces.

All we wanted to do was show the early development of the supercharger to show that it has more potential than the VQ35 supercharger did. Again, we were running less than 10 psi, and we are doing all of our tuning on 91 octane pump gas.

When we have our finished production kit we will have a finalized dyno showing the horsepower of the kit and of course we will list what psi we are running. Right now, it's too early to confuse everything until the kit is completed.

In regards to running 10 psi on other Vortech kits. I don't know why Vortech chooses to run 10 psi. I assume it's because they feel that the engines can handle it pretty safely. Perhaps it's because the compression ratio on the Mustang GT is only 9.8:1 which is significantly lower than the compression ratio of the VQ37 at 11:1

I agree with you completely. The percentage gain between the base test and the final test after installation of a supercharger should be the same as the manufacturer's after taking everything into consideration. To say that the final rear wheel number should be at least identical I can't really agree with because there are a lot of things that need to be considered such as elevation, air temperature, transmission, wheels...But yes, the percentage of horsepower gain between baselines should be relatively similar.

stormcrow

Understood. But, again, stating what PSI you used on the test G37 to ascertain the dyno posted should not be an issue. I don't see that this will confuse anyone nor do I see that it is relevant to the 370Z kit that is yet to be installed/tuned/tested. (Granted they are the same kit with exceptions being different fuel delivery and possibly the loss of the strut bar.) I honestly would just like to know what PSI is required to achieve 420+ at the wheel with 20" wheels. A lot of people have these on the 370Z, as well.

Also, as a potential repeat client, I would love to see transparency when you post dynos. Witholding key information as to how the quoted power was obtained is not transparent.

And don't mistake my meaning - I don't mean that wheel horse power numbers should be identical...but, more of what you stated of the percentages you purport in your advertisements (threads) should be reproducable by most, if not all, who purchase the kit. This wasn't the case for me in my last experience with a Stillen produced SC kit. Even when running 93 octane and not the piss-water you Cali guys call fuel.

But, I digress. Hopefully we will see some honest and complete posts about the previous testing and any future testing. :cheers:

Buddy Revell

Is it cool if you post the psi on the G37 forums, since quite a few of the guys over there run on 20s and have auto trannies? Could be useful info for those guys.

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'08 IP G37S/GTM Supercharger/20" DPE SP-5 Wheels/ARK GRIP Exhaust

kdoske

lol, guess Stillen should of released nothing. Sounds like they would have been better off.

Xan

Yes, you'd think people give them credit for sharing information all together.

Instead they focus on the information they don't have, think of dubious reasons why they don't have the info.

In the end this is information they will have before they can actually buy the product anyways....So why make such a point that you don't have the info today.... I don't get it....

Patience is a virtue...

RCZ

^ no one gets it. Kyle has a LOT more patience than I do. I would've told him to f off a long time ago.

NYBladeZ

Keep up the good work guys, we're looking forward to the S/C battle, I know a longer wait on our behalf is needed to ensure the quality and reliability of a product.

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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

Red370

People, be patient, Stillen is working with some great stuff here, wait for the press release, stop the speculation and let them finalize everything! Damn!

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2011 Mustang 5.0 | 3.55's | Lethal Performance off road H-Pipe | Magnaflow Muffler Delete | JLT CAI/Bama tuned 417whp/ 404 ft/lbs

Brazilbro

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Juke AWD/240Z SR20
08 Evo 10(Stage 2) SOLD
Fastest Sport 6spd 370Z 11.8 @126.5SOLD

rcm2525

And stop the trolling. I for one am sick of the BIRD crap. Let's wait and see. But I guess some here just need to believe in conspiracies.

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"To live outside the law you must be honest" - B.D.

shumby

the problem is tyhat stillen has their sales men on here selling there SC and not the guys that are developing it. So really what do we expect.

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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

G37Sam

Even though he might seem like he's trolling he does make quite some valid points.

What are we 5th graders with low IQs to get "confused". I feel offended lol

I still can't find a reason why the boost pressure was omitted honestly, reminds me of the days back in primary school when I gave in my report card with a few grades scribbled out, and it sure wasn't because my old man was going to get confused lol

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