Okay, I have a K&T turbo, stock bore/piston ect. 10lbs. Race gas. KT intake manifold, and BOV. Problem is when I start the machine (cold)the afr reads lean (13/14.5). So I can adjust idle fuel on pure logic to 4 and I'm good (12.5 afr). I can let it warm up, take it for a spin, and somewhere around 20mph or half throttle my afr goes rich. It drops to 10.4 at idle, 10.8 while driving. It will stay there for as long as I ride. I then will adjust my box all the way down to get 10.8 idle, 11 driving. If I stop and let it cool down, I'm back to lean start up, and adjusting the pure logic back up to grn/y/rd all on 4. And do this all over again as it gets to speed. The guys at K&T have bent over backwards for me trying to figure this out. We have changed the IAC valve, ECU, fuel box, put on a fuel pressure reg, even bought a pcV w/auto tune. Still no luck. We're thinking maybe the TPS? So Rayce is getting me a throttle body(with TPS) to try out. Ive went over everything. All lines look good. No vacuum leaks, hell I don't know. Any ideas? Any help or ideas would be very appreciated.
Xp or turbo problem?
dirt deval
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G
Guest
·It would still raise pressure under boost..as long as the source sees boost pressure. You don't want to set the pressure too low though as the pressure is needed for atomization / spray pattern. I'd ask Rayce what he thinks..I've ran the regs to vacuum on 800's with success and I've talked to him about it..haven't done an XP yet though.
I tried tapping into vacuum for the RR regulator. Due to the fact that you can only draw vacuum from 1 cylinder (without screwing up IAC valve function) the vacuum is very eratic. It bounces all over the place, therefore not a practical solution. The FP just isnt as consistant as hooking to boost only. I could see this working on an 800 because of only 1 throttle body.
G
Guest
·If you tapped into one IAC line how would running a Y to both screw up the IAC function? I'm not convinced this will solve y'alls problems BTW..I've just done it this to help the rich idle.
I guess Im not possitive that it will ? Considering that there is a port on the IAC for each throttle body, I figured the ECM controlled each cylinder independantly for optimum Idle Air Control ? ? Kinda makes sense why there is 2 plungers on the IAC valve instead of just 1 T'ed together ?
G
Guest
·I don't think it's quite that complicated..there are 2 outlet ports one valve AFAIK..Id be highly suprised if it opens and closes a valve for each cylinder on the intake stroke..that would be a waste of technology and money that would be better spent on making it a MAF style EFI system.
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655 Posts
Yeah, I will be super excited if this works. I will try anything at this point. Hopefully we will know if it works on ours soon!
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15,932 Posts
opcorn:Rayce explaind to me that a few 900 xp's were having issues withe the ecm & fuel controler compatability. He has a machine at his shop with the same issue and finally got it corrected by reprogramming the pro-logic. Thats all the details I know. I hope it works !
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11,520 Posts
Is it possible that there are some stock rzr's running lean or it just a turbo issue?
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516 Posts
Please,tell me what the fix was?
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655 Posts
Ended up being a program in the altitude fuel controller my xp didn't like. After many different programs, we found one that worked. It the one K&t uses todY
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516 Posts
im dealing with a terrible bog in mid range that wont go away until i ass about 6 to 8* of timing
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