Nitrous Backfire I Need Help Figuring Out Why???
Nitrous Backfire I Need Help Figuring Out Why??? I WAS AT THE TRACK AND I WAS SPRAYING THE REGULAR 150 SHOT OUT OF THE HOLE THAT I HAVE ALWAYS SPRAYED THEN A BIG FLAME AND POP I HAD 3 GALLONS OF RACE FUEL WITH STOCK TIMING I HAVE NEVER HAD ISSUES UNTIL TODAY I BLEW THE MAF AND SMOOTH BELOW FROM THE INTAKE BUT I WAS ABLE TO PUT IT BACK TOGETHER USING DUCKTAPE SINCE IT BLEW A BIG HOLE IN THE SMOOTH BELOW. I HAVE THE STOCK FUEL SYSTEM I HAVE NO IDEA WHY IT HAPPEN i HAVE THE FPSS AND I HAVE A NITRO DAVES WET PLATE SYSTEM I SHOULD MENTION THAT THE BACK FIRE HAPPEN RIGHT BEFORE IT SHIFTED INTO SECOND LIKE IT BACKFIRED THAN IT SHIFTED I NEED YOUR ADVICE THANKS
Last edited by assassinz28; Nov 17, 2007 at 09:49 PM.
My guess off the top of my head would be the infamous high rpm lean backfire. fuel pump may be getting weak, and/or a clogged fuel filter. Anyway, i am sure glad the damage was minimal. Do you have any logs?
Robert
Robert
Exactly what Zero4488 suggested. Get a fuel pressure gauge on there and monitor it and double check what you have the FPSS set to. I would even suggest to verify a/f on a dyno while you log fuel pressure. Also, are you running a window switch? What is the rev limiter set to and what are your shift points set to?
Nick
Nick
I do not have any logs or a window switch I have a fuel pressure gauge but mounted under the hood while the car is iddleling its like at 60lbs the fpss is set I think 40 just the same way it come out of the box i did not adjust it since it had always worked fine. when I took my car to the dyno it was running very rich but then i found out when i did the runs i only had like 3 pounds of nitrous in the tank so i think that is why it ran very rich. the rev limiter is set at 6600 my shift point the 1-2 is +4 the 2-3 is +9 the 3-4 is +13 this is adjusted with a hypertech programmer and no i did not install the hypertech tuning to advance timing i put no.
I should also mention that the only 2 things I changed since I sprayed my car last time is the tires I went from a 24.75 to a 26.25 inch mt streets but I adjusted that also with the proggramer and I also got a purge. I think maybe I had my car programmed to close to the limiter because about a month ago i got on it hard and it hit the limiter but did not think nothing of it and that same night I sprayed it from the hole and i heard it bounce of the limiter but no backfire and it ran consistent with my other times so that is why i did not adjust anything please help I am kind of scared of spraying it again what all should I check change or do before I spray it again to make sure it does not happen again
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I would get a window switch!! Tranny slips a little, and you'll be on the rev limiter with spray - not a good idea! And you need to find out what your fuel pressure is doing - pushing the stock pump a bit far in my opinion...
I should also mention that the only 2 things I changed since I sprayed my car last time is the tires I went from a 24.75 to a 26.25 inch mt streets but I adjusted that also with the proggramer and I also got a purge. I think maybe I had my car programmed to close to the limiter because about a month ago i got on it hard and it hit the limiter but did not think nothing of it and that same night I sprayed it from the hole and i heard it bounce of the limiter but no backfire and it ran consistent with my other times so that is why i did not adjust anything please help I am kind of scared of spraying it again what all should I check change or do before I spray it again to make sure it does not happen again
Robert