Back Fire issues

[charlieR34]

hey

I currently own an R34 and i have backfiring issues. I just wanted ask how to fix this problem. Is it really a major issue and whats the consequences of not fixin this problem? Also what causes this backfiring problem.

The car is currently runing stock boost and stock everything. I just added an air filter and a bov.

Thanx ppl

[Timmy G]

this might sound vague, but this is what i've heard..

skylines run rich in parts in high rev ranges to "protect" the engine and when you get off the gas, you'll often hear a couple of soft backfires

[carlo]

Its the BOV matey.

If your BOV is venting to atmosphere then your engine is running rich as the air it expects to be returned into the air filter is being sent into the atomosphere by your BOV.

If you plummed it back to your air box it should stop..

[r32impul]

I think maybe u missing the cat and running too rich mate!!

But that's good, my car have a 1/2m dia. fire ball when dyno

If you want to stop the backfire, buy a SAFC or have ur ECU chiped. it can allows u to set the fuel and air ratio. U can come to BMT and ask for DR. Drift in Melbourne

[charlieR34]

hey thx ppl for the advice...

I'm waiting for the SAFC ... hey r32impul.. how much is it to get a chipped ECU from BMT ? i just want to know the price. I think i should go get the car checked out from a professional just in case. Dont wanna do shit myself since i know shit about car.

Friend said that if i dont get the backfiring sound outta the way, it mite blow my cat convertor and its gonna waste more money then fixing it now.

LoL sorry this is a stoopid question, what does rich and lean mean when its about engines? To fix that u need a SAFC ?

=] thx ppl

[carlo]

Rich means more fuel in your fuel air mix, lean means less. The SAFC will allow you to tune your mix thus stopping the back fire.

The stock computer calculates air using your air flow meter, and assumes the air will still be around when your throttle body closes. Hence it puts more fuel into the mix.

(well put simply.. if anyone was to elaborate be my guest)

[charlieR34]

Thank you carlo for ya advice and information man.. greatly appreciated

[AkEaKe]

Backfire.....ummm If you wanna keep Cat converter alive, let's follow the suggestions because heating from backfire could burn inside the cat.

but in my place my friend makes a backfire system kit. It works well and it can turn on/off anytime you want.

[menace_s15]

I've had the same problem b4, it ended up being my BOV (since it vents to the atmosphere instead of returning back into the intake.)

Switched back to the stock BOV and all was back to normal..

[r32impul]

to chip ur car from BMT cost around $300-400, depending how good u talk to dr drift

[franks]

even with the safc + tuning, you'll still get backfire issues because the afm has already metered it and expecting it.

however, there is an option on the new safc (blue face) to eliminate overfueling with an external bov and hence stop backfiring.

[king_kw13]

hey guys - sorry but i am worse than charlie34.

So the backfire is caused by the car running rich (can it be cos of the 3" dump back i got and no electronic supports??) and that is causing the detonation of unburnt fuel in the exhaust? So any sort of management that will alter the air/fuel ratios to let it run more lean should eliminate this right?

[Guest RedLineGTR]

take the cat out and get flames...hehehe

[Dr_Drift]

Originally posted by charlieR34

hey thx ppl for the advice...  

I'm waiting for the SAFC ... hey r32impul.. how much is it to get a chipped ECU from BMT ? i just want to know the price. I think i should go get the car checked out from a professional just in case. Dont wanna do shit myself since i know shit about car.  

Friend said that if i dont get the backfiring sound outta the way, it mite blow my cat convertor and its gonna waste more money then fixing it now.  

LoL sorry this is a stoopid question, what does rich and lean mean when its about engines? To fix that u need a SAFC ?

=] thx ppl

PM me for discussion on your options for a R34. Had another 34 GTT in the other day that was detonating severly as someone had moved the CAS.... looks like a checkup on the dyno has aved him a motor....

Doc.