rxwhopper
TY 4 Stroke Guru
coming home tonight and it is really cvold out tonight, i was getting a backfire constanrly at wot. air fuel was at 12 and running 7 pounds boost. any thoughts what to check. was running great all day.
SPEED
TY 4 Stroke Junkie
Hitting Rev limiter?
mbarryracing
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Speed is on to something... Cold air making more HP and overpowering your clutching and bouncing off the rev limiter? Hmmm.
rxwhopper
TY 4 Stroke Guru
well i was watching that and it was under 11000 rpm. i also had the valve open to release some boost so was only showing 7 pounds on the ic side of it.
Doesn't matter what boost you are running, real cold air makes more HP, conditions could have been grainy from to cold, sounds like Rev limiter, We have seen that a time or two. Plus 11000 on tach could be 11,2 or 11,3 in real time
rxwhopper
TY 4 Stroke Guru
i will see when it warms up. but there is a big difference with that valve open bleeding off boost. i really dont think it was jitting the limiter. but was making good power today. i am having a heck of a time keeping the thing reving where its suppose to be.
they are tricky, conditions, track spin, etc. all change the out come
SPEED
TY 4 Stroke Junkie
TORS disconnected?
rxwhopper
TY 4 Stroke Guru
yes it is. i know, beeting your head. more power is more rpm which is more boost
SPEED
TY 4 Stroke Junkie
Any Codes flashing?
Check for coil failure or bakelite crack in coil where it could be arcing.
Check for coil failure or bakelite crack in coil where it could be arcing.
kinger
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How old are the plugs? One could be bad and under WOT it could be blowing the spark out.
rxwhopper
TY 4 Stroke Guru
it has been backfiring off and on since i owned it. just sort of intermittent and doing it more so when you first start out the ride. what plugs are recomended with the mpi just stock?
rxwhopper
TY 4 Stroke Guru
oh, i am getting a code 15 when i turn the key on but it goes away when the sled starts
look in the attak/apex forum and in one of the stickies there will be a link to the codes and what they represent.
rxwhopper
TY 4 Stroke Guru
yes i do know about them, just was wondering why it was only there with key on. reading in the turbo forums i guess its normal with a super. although i never noticed it before. I did have a hard time startin it in the morning though. turned over alot and messed with the throttle when turning it over. matbe that did it. i really thought it wouldnt start, was turning over to slow. hooked a car battery to it and after some coaxing it fired.Must be alot more drag turning that super when its cold
