JohnChan

I have a graph on my hand now. My first run has 317hp and the third has 345hp. My air/fuel ratio is kind of lean. Averaging close to 13.7. At Vtech, it is 14.3, 14.2 at 7500rpm and 13.5 at 9000rpm. Also, my car can pick up boost before Vtech and the max boost is about 7.5 psi. My turner said my supercharger is making more boost than the other s2000's for some reason. They monitor my fuel pressure and it is working fine (75 psi) rising with boost. They will contact Vortech to find out next week. Or they can rise up my fuel pressure. My car is save to drive on the street but will not last long on track with this setup.
Is the wide band O2 sensor before the cad or after it making the a/f ratio different?
What is going on??? Too much power is not good in my case. I just want to play it save. Do you guys have the same experience?

MacGyver

Still running with the stock injectors?

JohnChan

My car is 2002 (same ecu as 2003???) but they did not send me replacment injector???

kane.s2k

you're pretty much maxing out the injectors.

mayhan1980

Do you mind posting your dyno print? or post a link to it. I'm curious how it looks like.
Matt.

JohnChan

I don't have a scaner but i will make a plot every 500 rpm.

MacGyver

You have a tuner that doesn't know why your supercharger is making more boost than other S2000s, he can't diagnose your stock injectors running out of steam when they're pushing 75% more hp than a stock system, and he said it's OK to drive it on the street under the lean condition...time to find a new tuner

Road Rage

...or you will be finding a new long or short block. When I beefed up my Cobra, i went to one of the best tuners in the Mustang world, and checked him out with others. My car makes great, RELIABLE power, lean but not to the point of dangerously lean, and allowing for the fact that cars tend to get leaner over time.

P.S. You are at the limits of your injectors as others have said.

JohnChan

I am just driving easy for a day on the street! So, should be ok!
My graph looks like the following: hp, a/f, rpm
120,13.75,4000-----125,14,4500-----140,13.4,5000
160,13.25,5500-----195,13.15,6000-----230,14.25,6350
250,14.0,7000-----275,14.1,7500-----305,13.8,8000
320,13.7,8500-----335,13.5,8800
we did not max it because it is lean!
Can some one plot it for me! Thanks
Question: why vortech provide injectors to 2003 model instead of 2002, but 2002 and 2003 are using the same engine and ecu spec.
Also, how can they control a higher flow injectors without changing the timing box or the map box??? Will it be different mapping??? If they have two timing boxs, maybe i got a wrong one????
Please correct me!

AusS2000

The Vortech set up doesn't control the injectors at all. The FPR controls the fuel pressure but that's it.

If you install bigger injectors alone they will have the bandwidth to support your high end but will run richer in the low end. You could probably tune for this with a VAFC but I would recommend an E-manage to properly compensate for the injectors through out the range and give you all the tuning you nedd up top.