Any idea's with sled
- Thread starter Brojoe
- Start date
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- #2
History: Bought sled this fall. 2008 Nytro with MCX 270 kit. Conversion up from 240 kit, before it was stored for a couple years. 1800 kms.
So here's a list of whats been done so far:
Checked/changed all boost lines
Changed out mcx box with new
checked all exhaust for cracks etc
changed plugs
adjusted fuel pressure up to 50# from 43
checked and ensured injectors were working
fuel filter good
disconnected charge tube and mcx box and problem is still there at stock, just not as noticeable
seems to make boost when we turn the dial up, but soon stumbles after mid range
checked and repaired all wires
tors seems correct
doesn't throw a code
Any ideas would due appreciated.
Thanks
So here's a list of whats been done so far:
Checked/changed all boost lines
Changed out mcx box with new
checked all exhaust for cracks etc
changed plugs
adjusted fuel pressure up to 50# from 43
checked and ensured injectors were working
fuel filter good
disconnected charge tube and mcx box and problem is still there at stock, just not as noticeable
seems to make boost when we turn the dial up, but soon stumbles after mid range
checked and repaired all wires
tors seems correct
doesn't throw a code
Any ideas would due appreciated.
Thanks
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- #4
Bnorth
Active VIP Member
Can you get it through the mid range and make it work up top? What plugs you running and how are they gapped? Could be blowing out the spark in boost.
it would still tell you if you are lean or not, and eliminate the fuel system...does it do it when wide open under full boost?
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No I can't get it to get past mid boost. It seems to get worse the higher elevation we went. That video was in Revy ,about half way up Boulder. Not sure what brand the plugs are but they have been changed and gapped.
It feels like a fuel problem, and you are probably right about the a/f gauge. I have not been able to get it past mid boost with the turbo, but when it was disconnected, it would start good, get to mid point, stumble throughout and then carry on through.
Other points: sled starts and idles great, and will drive up the trail till it hits apprx 65km/h. The speed drops as I get into higher elevation
It feels like a fuel problem, and you are probably right about the a/f gauge. I have not been able to get it past mid boost with the turbo, but when it was disconnected, it would start good, get to mid point, stumble throughout and then carry on through.
Other points: sled starts and idles great, and will drive up the trail till it hits apprx 65km/h. The speed drops as I get into higher elevation
NM
Boost It - Fuel your Boost
How did you check the exhaust? Sure sounds like and exhaust leak.
What fuel pressure reg is on it. It might be a good idea to t in a fuel pressure gauge and watch it when RPMs come up.
Did turning up fuel pressure make it better or worse?
What fuel pressure reg is on it. It might be a good idea to t in a fuel pressure gauge and watch it when RPMs come up.
Did turning up fuel pressure make it better or worse?
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- #9
We did a visual inspection on the exhaust, as they do tend to crack, but all seemed well with it. I thought that if there was an exhaust leak it would still run good, but would loose boost near the top end, not near the mid point.
We put at tee in with a gauge and at idle was putting out 53#'s. It started out at 43# but we turned it up to make sure the pump wasn't weak. Adding the fuel didn't seem to make a difference.
JDen
Active member
Mine ran similar to that when I put on a Teth-Air wireless tether, was drawing too much power from somewhere wouldnt fire the secondary injectors properly. Never looked into the problem, just took off the Teth-Air and threw it in the garbage. Never a problem since.
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- #11
NM
Boost It - Fuel your Boost
It is always a good idea to eliminate a tether, rollover valve, or any other aftermarket device that is tapped in to ignition or electrical system.
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- #16
bigfish
Active VIP Member
that sounds like its hitting the rev limiter, check your spring in clutches make sure they are ok,have you ever change the primary or secondary springs?change anything in the clutching or increase boost.
bigfish
Active VIP Member
weird in the first vid it sounds more like a fuel issue
NM
Boost It - Fuel your Boost
I just listened to both vids for the first time. It is definitely ignition cutout so not fuel related. It is possible that it's rev limiter, but that should only happen if the clutching is way out to lunch. I realize the vid was at lower elevation. Does it do it as bad at high elevation?
You should return the fuel pressure back to where it was if you have not already done so. 50 PSI is way too much.
Ride it again and really watch the RPMs. If it goes over 9k then that is your problem.
We have clutch kits for those sleds if you need some help.
You should return the fuel pressure back to where it was if you have not already done so. 50 PSI is way too much.
Ride it again and really watch the RPMs. If it goes over 9k then that is your problem.
We have clutch kits for those sleds if you need some help.
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