Thread: Running Rich @ 7000RPM and UP
07-26-2013, 08:01 PM #1
Running Rich @ 7000RPM and UP
Can somebody get me some advice on how to get my AFR UP! Ever since I installed my Walbro fuel pump - I can't get the AFRs below 10.9 @ 7000rpm and above... I know this sounds silly - "well, turn the fuel pressure down"! - right?
I'm currently running a stock ECU with the Walbro fuel pump, 42lb Bosch injectors and a Riva RRFPR (without the boost reference line attached). Everything runs good and the AFRs stay safe if I'm at 58lbs of fuel pressure - UNTIL - I hit the 7000 RPM range. My ski is running great, then I see the AFR drop to 10.9 @ around 7000 RPM, then, the ski gets "stuck"... It wasn't like that when I ran my stock fuel pump!!!
I'm thinking of installing the stock 38lb injectors and dropping the fuel pressure or re-installing my stock fuel pump - but I'm afraid of leaning it out in the mid-range. I've also been running the RUDE fuel controller - which doesn't seem to help... WTF?
It goes from 13.3AFR @ 6000rpm to 10.9AFR @ 7000RPM and I can't get past 7100rpms - presumably, because it's running too much fuel up top...? If I keep pushing the throttle down after 7000rpm the AFRs get even richer - say 10.6 ...
Any help would be helpful.
07-26-2013, 08:11 PM #2
- Join Date
- May 2011
- West Texas
Try hooking the reference line up and dropping base pressure. Ya never know.
07-26-2013, 08:27 PM #3
07-26-2013, 08:28 PM #4
Put the stock fuel pump back in.......maybe the walbro is defective.
07-26-2013, 08:34 PM #5
my 05 ecu went into over boost/rev limiter at only about 10psi about 7000+ rpms and went pig rich
07-26-2013, 08:38 PM #6
07-26-2013, 09:15 PM #7
07-26-2013, 09:18 PM #8
Don't you have the rude controller ? Anything around 10 afr tends to sputter and not build revs
07-26-2013, 09:23 PM #9
07-26-2013, 09:36 PM #10
Something else is up here Craigo, 10.9:1 afr will definitely effect power output, but not to the extent where you will not be able to go past 7100 rpms. I used to turn my ski to 8000 rpms no problem @ 10.8:1 WOT before installing a RRFPR. I don't believe it has anything to do with the fuel pump, or else it would go lean, not rich.
I'd be looking into the s/c, where is the slip set at?
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