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

 

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

 

you have a FP gauge? what is your FPSS set at?

 

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

 

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

 

any more advice

 

my opinion what the problems are:

#1 you probably have a wet system
#2 the race gas

 

why would the race gas hurt it I thought it was supposed to help since i was not pulling timing

 

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...

 

That's what happened to me, hit the limiter and pcm pulled/cut fuel, and an ensuing lean condition, which in my case blew the intake apart at 7000rpm.
Robert

 

thanks for the call....please let us know if you need anything else

 

thank you all for the advice