Cuts out at high rpm?

71dartman · #1 (**permalink**) 08-30-2010, 03:31 PM

I have had the kit on for a few months now, and have been having an issue with the engine flat lining or cutting out when it reaches about 5000 rpm. I believe its just not getting enough fuel at this point. My question is, what will happen if I bump up the fuel pressure from the recommended spec? I was thinking maybe 10 psi more. The motor is a pretty healthy 440 with a lot of port work done to the heads. The cam isn't huge by any means. It just doesn't pull to 6200 like I think it should. I'm also getting ready to add a Nitrous Express kit and need to get this issue worked out first. Any help would be greatly appreciated.

69sixpackbee · #2 (**permalink**) 08-30-2010, 06:06 PM

What is your rev limiter set to?

..Bud

71dartman · #3 (**permalink**) 08-30-2010, 06:42 PM

I have it set to 6200. In first gear it will rev out to 6200 no problem but when under a heavy load thru second and third it just falls on its face.

TurboNova · #4 (**permalink**) 08-31-2010, 03:31 AM

What was your actual A/F before the missing happens? What is your injector duty cycle at the time it happens?

71dartman · #5 (**permalink**) 08-31-2010, 06:10 PM

Originally Posted by TurboNova

What was your actual A/F before the missing happens? What is your injector duty cycle at the time it happens?

You know I haven't been able to watch the screen when this happens, but it really feels like it's leaning out. I'm going to bump up the fuel pressure and start a new tune, we will see how that works.

69sixpackbee · #6 (**permalink**) 08-31-2010, 06:49 PM

This is when a WB datalogger is handy. I had an Innovate LC-1 on my stuff when I was troubleshooting. Worth their weight in gold. Make a blast, play it back, and then make corrections.