tuning questions...

[gixxer750]

Ok, I went an had my car dynoed a while back. Little did I realize, I had an exhaust leak. This matters because they were using a probe at the end of the exhaust. Car was tuned to 11.9:1 throughout the boost area.

I installed my wideband and bung today(AEM UEGO) and have found that that between 3.5k(full boost) and 5500 my car register's 10.0-10.5's....

I'm fairly sure thats accurate. I always wondered why I had black smoke at what the car was supposed to be tuned to. Seems I found the answer today.

Anyhow, I have a lex and 550's and no boost leaks(all hardpipes, good couplers and clamps, BOV not leaking), and the tuner had to pull 27 % fuel out under boost already to make it what it was. It was running really rich before that. He made 100 extra horsepower over when I got there.

Why is the car running so rich? I've got an emanage blue, and still running AFM on the car. I've got no codes, and the car drives good.

I just can't figure why I've got to pull so much fuel, unless my 550's are a little bigger than I thought or something is wrong with the car.


Any answers?

 

[MDCmotorsports]

Chris, Ive been told and seen 550's be bigger than 550.

Also, whats your base pressure?

 

[gixxer750]

dunno. still on stock FPR till my Aeromotive gets here wednesday.

It's always ran stupid rich ever since I put those injectors in.

 

[MDCmotorsports]

Id go have them flow tested.

Chances are they are over 550.

Either that or the stock FPR is fubar.

 

[hottscennessey]

I'm with MDC, I'd definately drop the fuel pressure a little, that way you won't have to pull as much fuel. Unfortunately you may have to re-tune your settings for idle and cruise.

 

[drjonez]

werd. if you have a walbro, chances are it blew your stock FPR wide open...i've seen that a few times.

if nothing else, back out the stock screw in the lex AFM....get more air in there!

 

[gixxer750]

I've got the screw on the lex afm backed ALL THE WAY OUT. It may have blown up my FPR, but wouldn't that make it run lean?


I don't care if these injectors flow more. They are coming out within the month anyhow. 850's are going in thier place. I'm going to be running a quite LARGE turbo very shortly.

 

[suprashy]

First thing is to test your base fp as per TSRM procedures. Set a good base fp, (not that u can w/o an afpr), then pull fuel as needed. Also may wanna ck. timing....