# SR20det backfire!?! **URL:** \ **Category:** SON240sx Automotive\ **Created:** [June 21, 2006, 3:33pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216 "2006-06-21T15:33:12Z")\ **Posts on this page:** 12\ **Page:** 1
**Author:** ![WEBSTER](https://avatars.discourse-cdn.com/v4/letter/w/c0e974/32.png) [@WEBSTER](https://forums.speedlife.net/u/WEBSTER)\ **Post date:** [June 21, 2006, 3:33pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/1 "2006-06-21T15:33:12Z")
I just got my 3" megan racing exhaust for my s14. I am getting a bit of backfire here and there. Can this be solved with an intake or is this just something I am gonna have to live with. Thanks for the help! Ryan. ---
**Author:** ![snowboard\_240sx](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/snowboard_240sx/32/5519_2.png) [@snowboard\_240sx](https://forums.speedlife.net/u/snowboard_240sx)\ **Post date:** [June 21, 2006, 4:12pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/2 "2006-06-21T16:12:54Z")
backfires are from un used gas…if ur just driving normal and it backfires there could be an exhaust leak but if u are driving it hard its just because ur engine is 100% efficient, better plugs/wires/cap/engine management can all help out with no backfiring and using 100% of the fuel ---
**Author:** ![240coupe](https://avatars.discourse-cdn.com/v4/letter/2/e495f1/32.png) [@240coupe](https://forums.speedlife.net/u/240coupe)\ **Post date:** [June 21, 2006, 4:32pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/3 "2006-06-21T16:32:43Z")
he could remove his cat then their would be no ignition source for the un burnt fuel ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [June 21, 2006, 4:56pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/4 "2006-06-21T16:56:03Z")
> [@240coupe](#): > > he could remove his cat > > then their would be no ignition source for the un burnt fuel i hope this is a joke ---
**Author:** ![240coupe](https://avatars.discourse-cdn.com/v4/letter/2/e495f1/32.png) [@240coupe](https://forums.speedlife.net/u/240coupe)\ **Post date:** [June 21, 2006, 5:26pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/5 "2006-06-21T17:26:22Z")
how does the unburnt fuel get ignited then ? ---
**Author:** ![S13GG](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/s13gg/32/5506_2.png) [@S13GG](https://forums.speedlife.net/u/S13GG)\ **Post date:** [June 21, 2006, 6:20pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/6 "2006-06-21T18:20:38Z")
> [@240coupe](#): > > how does the unburnt fuel get ignited then ? hmm what the flash point of petrol? flash point = the temp at which something ignites without direct spark, just heat I would hazard a guess its pretty low ---
**Author:** ![alesserfate](https://avatars.discourse-cdn.com/v4/letter/a/f6c823/32.png) [@alesserfate](https://forums.speedlife.net/u/alesserfate)\ **Post date:** [June 21, 2006, 6:22pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/7 "2006-06-21T18:22:28Z")
wasnt there a thread liek this about misfiring system not too lnog ago ---
**Author:** ![DTS](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@DTS](https://forums.speedlife.net/u/DTS)\ **Post date:** [June 21, 2006, 6:58pm UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/8 "2006-06-21T18:58:30Z")
> [@240coupe](#): > > how does the unburnt fuel get ignited then ? unburnt fuel + hot exhaust piping = backfire ---
**Author:** ![WEBSTER](https://avatars.discourse-cdn.com/v4/letter/w/c0e974/32.png) [@WEBSTER](https://forums.speedlife.net/u/WEBSTER)\ **Post date:** [June 22, 2006, 5:04am UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/9 "2006-06-22T05:04:06Z")
So why am I getting unburnt fuel. How can I stop this? ---
**Author:** ![system](https://canada1.discourse-cdn.com/flex034/uploads/speedlife/original/2X/b/b7170c8eddc0b95ece6b88172b2f416a08489a45.png) [@system](https://forums.speedlife.net/u/system)\ **Post date:** [June 22, 2006, 5:43am UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/10 "2006-06-22T05:43:42Z")
> [@240coupe](#): > > how does the unburnt fuel get ignited then ? Removing the cat would produce more/bigger flames during backfire. Webster; could be a number of reasons. Open to atmosphere bov, richly tuned ecu, vaccum leak. What kind of backfires are you getting? ---
**Author:** ![WEBSTER](https://avatars.discourse-cdn.com/v4/letter/w/c0e974/32.png) [@WEBSTER](https://forums.speedlife.net/u/WEBSTER)\ **Post date:** [June 22, 2006, 11:03am UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/11 "2006-06-22T11:03:18Z")
It happens mostly between 1st and second. Just one big bang. ---
**Author:** ![DTS](https://avatars.discourse-cdn.com/v4/letter/d/8491ac/32.png) [@DTS](https://forums.speedlife.net/u/DTS)\ **Post date:** [June 22, 2006, 11:48am UTC](https://forums.speedlife.net/t/sr20det-backfire/97216/12 "2006-06-22T11:48:22Z")
check your timing