SR20DET with cherry bomb loud backfire!

[s13silviasr20det]

ok so i got my car running and it runs good real good but it backfires really really loud and shoots flames....i know i need a tune but i want to know theres any other reaon why it would do that...and that loud.

ok heres what i have done to it.. its a sr20det with a t3 top mount setup.has full 3 inch piping with NO restrictions... have a q45 igniter, light weight pulley kit,front mount intercooler,stock maf with blitz filter,external wastegate.

so people told me it culd be either the MAF,timing, because i have no cat,fual pressure to low ( i doubt that one) ,or running too rich...

so can i get some help please.

oh and it doesnt mostlywhen i let off the throttle or down shift.

[Stripes]

It's pretty normal actually. You have no cat, so there is nothing to clean up that unburnt fuel, so when you let off the gas it is getting ignited and after firing, which makes your exhaust shoot a flame. It's really nothing to worry about.

I'm willing to bet it wouldn't do this if you put a cat on there.

[jwlong1379]

do u have a bov that isnt recirculated

it could suck in air thats not read by the maf and it will cause the car to back fire

[s13silviasr20det]

hhhmmmm....ok so im gunna put the cat back on for sure now......and as far as the blow off valve im on compression surge until i decide what blow off valve to get.

[rc1honda]

Running rich or timing. You could try to back the timing off a little to see if that helps or you can try to lean it out a little but be careful as im sure you know.

[Stripes]

Don't mess with the timing man. Unless it is missing or studdering then you should have to touch it. Just do one thing at a time. See what the cat does; if that fixes it then there you go, problem solved. If you go and mess with many different things and then test it out you will not know which one solved your problem and you risk causing other problems.

[seanman]

Don't mess with the timing man. Unless it is missing or studdering then you should have to touch it.

I think you meant "should'NT" have to touch it. Just wanted to fix that if thats what you really meant, no wrong ideas goin around hah

[s13silviasr20det]

ok and latley when i come to a fast stop the car will idle really low and turn off...if i come to a slow stop it wont do it....

[gdbyyosh1to]

ok and latley when i come to a fast stop the car will idle really low and turn off...if i come to a slow stop it wont do it....

This is normally caused by not having your blow off valve recirculated. You can do that or get a standalone ECU that uses a MAP sensor instead of a MAF sensor. I recommend the first option... much cheaper

[240life]

This is normally caused by not having your blow off valve recirculated. You can do that or get a standalone ECU that uses a MAP sensor instead of a MAF sensor. I recommend the first option... much cheaper

He isn't running a BOV right now...I'm guessing boost leak

[s13silviasr20det]

He isn't running a BOV right now...I'm guessing boost leak

i checked all the piping and its not a boost leak....i took my car to a place called ROAD RACE in santa fe springs i think it was, they work on evos but a 240 owner there said that its because my maf is too close to the turbo inlet and when i let off it creates turbulance in the maf and it doesnt read so it shuts of the car........those were his words so i just want to get a second opinion from you guys before i make like a intake pipe.....oh and they also found a leak from the manifold to the turbo inlet base gasket but said that doeasnt hurt anything and i just need to replace it...

[s13silviasr20det]

This is normally caused by not having your blow off valve recirculated. You can do that or get a standalone ECU that uses a MAP sensor instead of a MAF sensor. I recommend the first option... much cheaper

as far as a stand alone with a map sensor what do you recomend??? cheap? how cheap? because im a budget

[s13silviasr20det]

so what MAP unit should i use???