04-24-2008, 05:52 PM #1
did some a/f testing today..little scary
so I went out for my first ride after getting my rxp back together and I decided to bring my lm-1 with me. I'm running riva power filter, rr sc impeller, riva pro series ic, gutted waterbox, riva thru-hull pipe, and 42# injectors. The water is still veeeery cold, but the air temp aint too bad. I expected to have plenty of fuel flowing with my setup and the 42's, but my lm-1 told me a different story. I made sure it was all calibrated before I installed it, then put the ski in the water. At idle I was reading 14.2-14.6 afr. When I eased it on up into the 4-5000rpm range the afr would be in the 14.9-15.9 range the whole way . From there on the afr would start to drop a bit, slowly, and as I approched the rev limiter it would settle in at around 13.5 afr at wot. Not good.
I know it's cold and that will lean it out a bit, but those numbers are just scary, especially up to the 5000rpm mark. I'm gonna do more testing to find out if somehow my readings were no good, or if I have bad injectors, or what. looking at the weather forecast, I won't be able to test again for a while, but I hope it goes better next time.
04-24-2008, 05:56 PM #2
Mike something is definitly not right. Especially to be having AFR numbers in the 14 range at idle.
I would buy a new 02 sensor and try again.
Also, its normal for your AFR to go in the 13's at cruising speed while not under a load.
At WOT you want to see 11.9
At idle the numbers are usually in the low 12's
04-24-2008, 07:09 PM #3
Yeah I'm hoping it's a bad sensor and all is good, but we'll see in the next few weeks.
Oh, and btw it's greg(dv8rxp) not mike(dv8raaz) lol that's ok. I hope I can get him to get his rxp out of the garage and in the water with me soon.
04-24-2008, 07:33 PM #4
Sorry Greg, i get you two guys mixed up.
04-24-2008, 09:30 PM #5
04-24-2008, 09:33 PM #6
No, it's not the prop. It's just normal for the AFR to go into the 13's while cruising, even on a stock ski. This is just the way the ECU's are mapped. The ski is not under boost and not under load and is running at peak fuel efficiency.
04-24-2008, 09:46 PM #7
unless my 42's are not really 42's and I never knew it because I did'nt have the lm-1 until now I did get them second hand from someone that I don't put too much trust in anymore after some work he did for me a few months ago.
04-24-2008, 10:01 PM #8
04-24-2008, 10:13 PM #9
I'll try to get a number off of them tomorow if it's not raining too bad.
04-24-2008, 10:28 PM #10
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