how do i fix the problem of the little back fires when shifting i have a redtop

[SlidinSideWayzSR]

i have a red top SR and every time i shift it seems like i get a little back fire i thinks its becuase the sr runs rich idk thats my opinion but if any one knows how to fix the problem let me know thnks

[Emperor_Tha]

best way, recirculate the bov

[MMotorsports]

Stock SR20 and do you have AFC.Also getting any codes from the ECU

[SlidinSideWayzSR]

my B.O.V. is recirc. and its pretty much a stock redtop has a frontmount bigger fuel pump no cat 3inch back

[s13_silvia_redtop]

i had that problem too, but i love hearing that sound lol. well my problem was i had a boost leak and was losing air after the MAFS so it would run just a little too rich, check for leaks.

[T-rev]

you're not running a cat, thats why. The cat burns up the excess hydrocarbons (among other horrible things) in your exhaust. Without one you get backfiring.

[redtop91]

From what I've gathered using the High Volume Walbro (or whatever fuel pump) with a stock FPR will make your car a bit rich so if it bothers you terribly much an FPR might be in order, provided of course that you have an aftermarket fuel pump and if not just ignore me.

[IanS]

I have a cat and I get the backfires

you're not running a cat, thats why. The cat burns up the excess hydrocarbons (among other horrible things) in your exhaust. Without one you get backfiring.

When all the excess fuel hits the white hot ceramic in the cat or turbocharger it burns, often resulting in pops known as afterfire, the use of bent piping, resonators, and baffled mufflers keeps the pops from being heard.

I have come to accept it as normal, I started with the same setup as you, and I have had radom afterfire for 3 years. My setup as of now, covers all the normal causes of afterfire. Bov is recirculated, Nismo FPR is installed and properly adjusted, AFR is normal. I have experienced the backfires while running a testpipe, and catalytic converter. After doing some research I feel that the most likely cause of the richness on shifts is possibly caused by a conservative setting of the overrun fuel cut on the redtop generation ECU. The best way to get rid of it is to put on a muffler with baffles.

[goalguy02]

Going from WOT to no throttle when you shift. The injectors are already dumping the fuel, but when you let off the pedal to shift the Throttle Body closes for a split second. Same reason you get a spike in your AFR during shifts.