Contact Sbastian at Specialty Z in Chatsworth in Ca
Stillen claimed my car was at 419 but also like you my car felt flat
after Seb did a custom Air 2 air set up and ECUTek tune the car feels good

Uprev pulls AFR but I remember a forum member stating it was not 100% representative of what the actual AFR is, it is close but the best way to know your AFR is to run directly to it.

yes, a pre install dyno was done on same machin with same operator. Three pulls averaged to 290 HP on my stock nismo. So my post install gave me a delta of ~47 HP. I plan on doing dyno after each upgrade.

The statements about hearing and feeling a boost leak is incorrect. I couldnt hear or feel a thing when I was installing my kit but knew something was off. I pressurized my system and found a bad leak at only 3psi from the MAF sensor, the gasket was crimped.

As others have said, its that garbage stillen tune. This is their ultra safe tune that they use for warranty purposes. Getting a custom tune will make the car a whole lot better (pending no boost leak).

Have you confirmed the water system is operating properly? There are numerous guys here that have had the pump not hooked up or something and then you are basically blowing such hot air that it is robbing you of a lot of power. Just something else to consider.

When you get that all figured out and make some decent power...let me know when you are ready to make some big power and Ill get you the Air to Air. It will also help with that "throw back" feeling as it increasing responsiveness 10 fold.

Do you have any of the graphs available that you can post so we can see how far he took the car each time?
With the Stillen being centrifugal it does not make max boost until redline (7500), and I have seen even with my own car they did not take it to redline and it looked off until I realized they only went to 6800-7200.

@topgunz...thanks for the info about not hearing leaks! As far as the water system, I believe it is working properly. We had a little trouble getting the pump started as it was air locked, but was quickly corrected (with a little bit of a mess). The whole install took a while as we worked on it sporadically over time when we both could get together. Took so long the battery died and we had to jump the car for it's first fire up after the install (first turn after install and it doesn't turn over scared the crap out of me...in the back of my head I heard my wife telling me I wasted my...our...money). So when we jumped the car it blew the 4A fuse of the pump. Mechanic noticed it wasn't running so we shut it down and found the blown fuse.
I now periodically check the reservoir. The reservoir has quite the turbulence and I often listen for pump running prior to starting the car.
I will look you up for the A2A!

@dreamer...tonight I will try to get you the data. I will chop out the parts that are just leading up to the pulls and the parts that are after throttle is let out. I do a quick check and you are right about the MAP...at 2500RPM is is at 3.02 and when WOT start and RPMs start to ramp up it slowly starts increasing and by around 3500 it is at 4.88 and stays there up through 6800 RPM and doens't go any higher...Im guess it is at the max voltage by then and goes with what your saying that I need an after market sensor that has a higher dynamic range. I assume previously it only needed to measure "negative" pressure and now it needs to measure both "negative" and "positive" pressures.

I do have a boost sensor but I didn't log that data as the gauge supposedly does the logging and didnt figure out how to do that. Just getting the Cypher to log was my main task while dyno'ing. Didn't want to hold up the operator to figure out how to log using the gauge (PLX).

I think these guys are onto something ...

:rolleyes: I think you have just experienced exactly how 'good' the Stillen canned tune is :ugh2:

Seb with Specialty Z gets rave reviews for remote tuning - he's an extremely experienced tuner with excellent customer service and response time :twocents:

I don't have any personal experience with the stillen kit - but something is definitely wrong here outside of the poor stillen tune solution. He really should be making a lot more than +50whp.

There very well could be something wrong, but he wouldn't be the first guy to make far less than stillen claims for power. The really sad thing is, even though the tune is conservative and makes no power, it's still not particularly safe when compared to a custom tune.

I know one guy here in Texas who got a 62 hp increase at the dyno over stock using the canned Stillen tune. Custom tune was more than double that. FWIW.

From all that I've read and heard, the Stillen canned tune is barely sufficient to drive to a nearby tuner for a custom tune :eekdance:

But hey - it's CARB legal =)

AND you get a 36K warranty...but at cheap breathing mod power levels.

With Stillen tune my car did 320 , after Seb im at 420 at the wheels