Originally Posted by dan l

Just got a call from a friend with the same problem. Can't go richer than 12's. Evo IX, downpipe, testpipe, catback, intake. Then I realized looking at his log when it was 70 degrees out and he was at 90% duty cycle at 22psi. With this colder weather he's just out of injector. This car is probably the same.

What power did the car make on your dyno. I was at a little over 300whp and 315 on your dyno nov 3 and on the edge of being out of fuel on a stock IX w/catback and MBC. At 310whp I wouldn't be pushing stock injectors at stock base fuel pressure any more on your dyno IMO!

You can do the math and you have 20ms to inject fuel at 6000rpm's. At 16ms that is 80% duty cycle or the safe recommended limit. 90% and your pushing your luck. Low quality injectors tend to saturate or just fail (the coils overheat) at this point. If your at 100% then we call you a DSM'er too poor to afford the right parts LOL!

Originally Posted by dan l

Thats why I specified on chads dyno. I personally had my car on it and know about what kind of hp the average evo IX is going to support on stock injectors. Its a simple problem, just slipped my mind. The customers car has too many mods for the injectors, very simple actually. Gonna have to turn down the boost in this colder weather with denser air.

Mellon, you should know I'm the black sheep supporter of running lean. I shoot for mid 12's on my personal cars...........

Originally Posted by EvoTech

Chad,

Did you check the duty cycle of the injectors. I would not think that a stock turbo'd ix could max out the injectors at 22 psi, but the symptoms do sound consistant with a very high duty cycle. I have found that once they reach 95% or so you are unable to richen it up no matter how much fuel that you add. You mentioned that you may have had a winter fuel blend with a high ethanol percentage which would require more fuel and a higher duty cycle. Just a thought.