For the most part I have a big grin on my face. I have a slight question though. I have a whirring noise just in front of the rear wheels. I hear it in the inside and it seems more prominant in the right rear of the car. Do other APS owners hear this? It sounds like a turbocharged computer case fan. The car runs fine. Gotta figure out what that noise is and then get a baseline dyno # on Thursday unless work gets in the way. Thanks.

 

It could be the fuel pump. Congrats man

Az

 

Please give us (future APS disciples), more details on the performance. How does it feel? Are you at stock boost? Who did your install? Internals?

 

con grats!

 

Its the fuel pump... mine does that too. Congrats!!

 

So that whirring noise is normal? Cool. Ooooooh s@#t!!! A big thank you to Evolution Autosports in Chantilly, VA for doing the install. The techs there do great work and the owners do their best to keep you informed while also giving you honest unbiased advice. I'm still on stock internals. Exhaust is fujitsubo legalis with JIC y-pipe.
As far as performance goes I haven't really ramped on it yet. I'm running the 91 octane program for now but it feels real, real strong. It feels like stock until you put your foot into it. I don't feel any lag like I do in my A4. The car starts accelerating and then you hear the intakes start sucking in air and turbos start spooling and you shoot off like the starship enterprise. The bov isn't obnoxious like I hear on some cars. I really didn't notice it that much. The quality of the kit is top notch just like everyone else says. There are some really tight clearances in some instances though. I still have to do some more evaluating. I'm going to let someone else take a spin in it who has better descriptive writing skills and then give you an update.

 

The whirring sound is known but should be able to be fixed. The install on my APS was done with a few things in mind to enhance or improve the kit. They put some material around the pump to make it fit more snug so it doesn't move around to make that noise.

 

Out of three runs the first was the highest at 364whp/330tq. It was boosting @ 0.7bar. Still on the base map and I forgot to add on the last post that I have indivia test pipes. I'll try to post the dyno graph later. It was a dynojet.

 

In my calculations, 0.7bar is a little more than 10psi.. isn't that a little high? Are you sure it was exactly 0.7bar?

 

At last...a dynojet dyno! Get thing things posted up if you get a chance.

And congrats on the install.

Also, regarding the fuel pump. When I installed mine, it was a really tight fit. I know some guys installed theirs wihtout the rubber grommet cushion thingy, and it whirred like crazy. Might wanna have the shop double check that. My Walbro 255 is barely noticable over the stock sound of the old fuel pump. Maybe 10% louder.

 

The APS 91 octane base map should be closer to .5bar , not .7bar

 

Huh. Zippycar on 350zmotoring.com dyno'd over 440whp @ 8lbs & conservative tuning. Why such a difference?

 

Becuase they likely used an inertial based dyno..such as dynapack or dyno dynamics...etc. The numbers can vary wildly based on how the dyno is setup.

That is why a dynojet is better for car to car comparisons. You are just spinning a known mass, which never changes...and there is nothing to really calibrate. Load based dynos are better for tuning, however.

 

Thanks for the explanation gq. I just can't believe the difference in numbers. That is a wide variation! I'm not sure what dyno Tuan @GRD in Illinois uses. They did the install.

 

Another thing to consider is he stated that he is running the base map which is set at 7 - 7.5 psi (I think he errored when he said .7 BAR). The 91 octane base map out of the box is of course pig rich.
ZippyCar made mention of "conservative tuning" with leads me to believe that he leaned his A / F ratios up some instead of leaving them ultra-rich out of the box. ZippyCar also has his APS free flowing exhaust complemented by the APS Test Pipes. This guy mentioned only test pipes. All of those things might explain some of the differances as well.

 

I agree and thanks for elaborating, but 80hp?

 

A dyno dynamics graph could be anywhere from 10 to 15% different from a dynojet!!! Crazy but very true.

To give you an example: An stock STI dynoes at around 210whp on a DD dyno, whereas they dyno closer to 240whp on Dynojet.

 

I think with GQ explanation and the points I offered the discrepancy in numbers are plausibly explained. Free flowing exhaust makes a big differance with turbo applications. Of course the room to gain power by leaning out the A / F ratio would be where I'd expect more of a differance. Remember these kit come very very rich out of the box leaving much room for power gains with experienced tuning. Last but not least differant dyno types alone can offer so many figures I'm learning. Differant dynos for differant purposes. So I can see an 80 rwhp differance with all these things considered.

 

I follow but that's if he used an inertial based dyno as gq suggested.

 

Hey gq_626,

Dyno pack and dyno dynamics are load based not inertia type dynos.

Peter