STILLEN Exhaust & Gen 3 Intake Dynos - 18hp Each!

nismoflip6

^^^Ditto

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-Mike-
2007 San Marino Blue 350Z

370ZDreamer

Still no air fuels?

alan93rsa

I would expect the A/F, air fuel ratio, to be about the same as stock. As long as the ECU is not modified and you aren't in the outer limits of the injector duty cycle the AF should remain about the same as stock in a closed loop system.

RCZ

Can we pictures of the intake installed? I'm very curious as to where it sits.

LiquidZ

Come on Stillen! Don't leave us hanging.

Denny McLain

Guys

New to the 370 list as I just purchased a new 370Z the end of last week. However, pretty darn salty at hot rodding cars being a former dyno shop sponced racer currently owning the highest hp N/A street driven C4 on the Vetter forum. This particular car has had over 1000 dyno pulls and there is literally nothing stock in the engine. 12.5 to 1 398ci trying 3 different of heads and a dozen different cams to get the combo worked out. Time for a new challenge.

With that said.........In a new learning curve and I'm looking for effective mods and objective independent dyno restults to back up their effectiveness. And.......no, I don't trust any of the shops and yes.....I know the dyno tricks.

I have some issues with this Stillen post. First, they are an old reputible shop and posting individual results from an intake and exhaust is nice; but why isn't the results of both posted?? Something doesn't appear exactly right to me.

Already tried to purchase (if the frickin shop will call or e-mail me back) a set of high flow cat as that makes sense. Will have the car dynoed bone stock for a rwhp and fuel/air baseline. Will install the cats and will post the results.

In looking at the exhaust, I see quite a bit of room for improvement but the stock intake doesn't appear all that bad. So exactly where is the restriction that causes the 18 hp loss??

The stock intake is cold air with twin filters which appear to be more than sufficantly large enough to support 300rwhp plus. After trying three different intake systems on my Vette I went back to a modified stock setup with a K+N filter. The car currently makes over 470 rwhp and has made as high as 480+ with the same modified stock intake.

So where is the objective independent results?? I'm a buyer!! But, ya got to prove it to me.

Josh@STILLEN

Hi Denny! Thanks for taking the time to post. As stated before, we had limited time with the vehicle from Nissan, and with the R&D and testing, we were only able to get individual dynos literally before the car was returned same day.

We have since taken both the intake and exhaust into production, which if anyone is familiar with producing products of these nature means the prototypes are destroyed to create the jigs for producing exacting production parts. This is currently where the part production is at, and we anticipate production parts in 3-4 weeks.

Once we have parts again in hand, we can get them back onto the 370Z and get combination numbers, and your other requests.

We also realize that in this day and age, with some manufacturers taking advantage of posting dynos in their favor, regardless of actual results, that our dyno results on our dyno will inevitably be considered tainted, and look forward to independent dynos to back our claims, just as we had to with the G37.

With all due respect, the differences between a C4 and a 370Z are so numerous, anything but extremely generic points on general automotive theory would apply. We've gone through over 50 variations of this intake on the G37 to produce the gains that the 370Z is also benefiting from. Tube lengths, filter sizes, steps in pipe sizing, all of these variables play into the gains, and have effect on the performance.

We look forward to your, and others independent testing and reviews when these items are released, I'm confident you won't be disappointed.

RCZ

I will gladly do independent testing for you if you send me a set or at least give a discount to offset the price of the dyno runs I promise back to back runs without taking the car off the dyno with video to prove it.

Denny McLain

Hi Josh and your welcome for the post. Watch what ya ask for regarding independent testing.

The car goes on the dyno tomorrow for baseline testing with 150 miles on the car. High flow cats, Y pipe and high flow intake filters have already been ordered and dyno time scheduled for Saturday to see how they work. Each will be tested individually and as a combo. Consistent cool down, consistent water/oil temps, etc. etc.

Trying to figure out the tuning as it is different, but next step will be tuning software/more dyno time to optimize the system. The majority of people leave a lot on the table due to lack of optimization of what they already have.

Maybe headers, full exhaust after that to see if there is any additional gains to be had. Intake?? We'll see how the mop flops, but I've owned three turbo cars and for sure, that works.

Even though there is a big difference between a small block Chevy and a Nissan motor, the same basics apply. Air in - air out - optimal fuel ratio - optimal timing = Horsepower. The good ol boy school of hot rodding still applies and dynos don't lie......Operators of the dyno do. It's a science and sound clips/butt dyno's don't work. Don't tell me it "feels faster", measure it under controlled condition and tell me then.

I have zero financial nor special interest in anything, just a passion for fast cars and what really works. Don't mind spending a few bucks nor letting others know.

Josh@STILLEN

Denny,

Glad to see you're putting in the dyno time and willing to release results for the benefit of the group here. Information from an independent sources is what they want to see, and we at STILLEN are excited when that takes place, because every part we build is tested and performs, so there isn't a concern when someone is taking the part to the dyno, we know what to expect.

I just wish the exhaust was available now as you're obviously in full mod mode.

HFC's of the parts you list should give you the largest gains. These cars react well to them.

If you're looking for a strong tuner, I would recommend COBB, the only problem is they haven't released their tuning software to tuning shops just yet, they are still working on it, but they are spot on with their abilities and control of the Nissan ECU.

Good luck with your results, we hope you'll give the Gen 3 Intake a consideration upon it's release.

Denny McLain

Josh

And I thank you.

It's a clean sheet of paper comming into this and if it works......it works! As they say in the car business, "I ain't married to any of them" and if your intake/exhaust can work to optimise a setup.....hey, great. It's just in the literally years and years, and car after car of doing this, typically the bark is worse than the bite when it comes to aftermarket claims. Learned through the school of hard knocks to be skeptical until proven different. Wish that wasn't true, believe me.

Thanks foe the heads up on the tuning software. Cobb evidently is located close to me and I may drop by for a chat but you're the second person to recommend them.

Man.......I just love this stuff, sure puts a grin on my face.

Scribe

I've dealt with Stillen products before during my decade long love affair with DSMs. They produce good quality products and are sincere about their efforts.

Josh, the best way to overcome the skeptics is to be as thorough in what you post when you guys get your dyno time (obviously you know this). I'd hate to have to wait for more results after your product goes on sale AND someone buys AND they get to a dyno. Here's what I think would satisfy the community:

Not all of us are like Denny, looking for a single high point to justify our purchases. Those of us looking for maximum area under the curve want a better ability to evaluate your product. So, for the rest of us, a full dyno pull readout, from 0-redline would be fantastic. This will help those that are looking for the kinds of results I am to really assess your intake and whether it meets our specific needs. Being a long tube style, I expect that the ability of the tubes to breathe at higher rpms may cost a little down low whereas a shorter, ram style intake may sacrifice high rpm gains for more area under the curve elsewhere.

I think the A/F is key as well. Therefore, I would greatly apprecieate the A/F readings for all pulls.

Thanks. I'm looking forward to the results.

LiquidZ

Well said.

Minicobra1

I'll be paying attention to this thread I almost bought the JWT pop charger Intake this weekend, but they are only claiming a 6-10hp gain,
which sounds about right for an intake.
Interested to see what Stillen can do with their intake.

I've go the Nismo exhaust installed and will be looking to do an intake and some HFC's next.

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Denny McLain

If you read Lingenfilters book, he emphases maximizing horsepower within the intended rpm range in which the car will be utilized. That said, have a spreadsheet that I plug the dyno numbers into that replicates a quarter mile run. I get both average hp within each gear and an average hp over what the entire quarter mile run would be.

Then shame on me.....back it up at the track typically looking at the mph vs time taking in consideration the weather conditions. Don't have a true weather station, but sure do look at the barometric pressure, humidity, temp and 60' time for track prep.

Peak hp or peak gains are nice, but it's the average hp gain that wins races. Again, new to this list, not new to doing mods.

In 100% agreement about preproduction dyno numbers vs real word user numbers. Was the first person to purchase and paid $2k for a set of stepped headers with merge pipe that were hyped to produce a 25 hp gain over my Hookers. Would have been happy with a 5-8 hp gain.

They didn't fit, leaked, rusted and after a year and dozens of dyno runs to make then work, I sent them back. The gains were ZERO on the dyno vs a set of conventional headers. I then called Larry Meaux who writes racing software and whose cars have over 40 NHRA records. Larry said in his experience, this particular type of header at best would produce a 1% gain. Sometimes none. My experience was none.

So much with premarket hype......this is where any BS ends.