back fire

[onlyoneface]

i have a stock red top and if i decelerate in either 1st or second to low rpm i get a really big back fire why? it doesnt bother me i think its funny, oh yeah i have megan DP rsr 3 inch exaust with no cat.

[fliprayzin240sx]

Open air BOV???

[!Zar!]

You sure it's not a rotary?

[onlyoneface]

SARD vented atmospheric BOV.....and no its not a rotory

[HS13KLS]

lol my car does that too.and shoots flames. i have a stock KA but it has a full 3in blitz nur spec. and a 3in test pipe.its probably running a little rich.and dumps raw fuel into your exhaust and POP lol..but thats what i was told.

[Koopa Troopa]

SARD vented atmospheric BOV.....and no its not a rotory

You're probably running rich from the loss of air after the MAFs from the atomspherical BOV

[phaiwezzie]

lol my car does that too.and shoots flames. i have a stock KA but it has a full 3in blitz nur spec. and a 3in test pipe.its probably running a little rich.and dumps raw fuel into your exhaust and POP lol..but thats what i was told.

sounds fast!:yum:

[LigouriRd]

i have a stock red top and if i decelerate in either 1st or second to low rpm i get a really big back fire why? it doesnt bother me i think its funny, oh yeah i have megan DP rsr 3 inch exaust with no cat.
Does the backfire occur immediately after letting off the gas or does it take a while. Immediately would be what Koopa is describing. A bit later could be a leaky injector that is pissing fuel into your exhaust. It takes a while for enough to build up for it to ignite.
When I had the that problem I could get a M80 type backfire decelerating in any gear. Very usefull for tailgaters...not good for my exhaust though.

[Forge_55b]

my friends s13 does that too all the time and its when he slows down in gear to around 1k rpms and then it backfires......im guessing its the bov slightly leaking on decel causing a slight rich condition throughout the slowdown then pop when too much fuel gets there

[HS13KLS]

hey so this is funny...so each car is different.but for a sohc in my car at least. if you put it into second.doing about 30 miles an hour. around 3500 rpm..floor it for a second.then immediatly turn off the car all the way and start it extremely quick and youll shoot flames and a huge backfire.last night i shot a four foot flame.and it sounded like a shotgun.ha.you can do it in any gear.in flooring it from 3thousand to 3500rpm,turning off the car fast, and turning it back on shoots flames

[TheSquidd]

Mine did this when I had a boost leak.