Backfire - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

mxykn · 01-07-2006, 12:44 PM

sorry for the noobness but i was wondering if backfire was bad for the engine... i hav an sr swap in my 92 240 with full 3 inch piping for the exhaust (strait pipe too)... when i stay in the same gear for a while (20 seconds maybe) not pressing on the gas my car will backfire really loud... really really loud... i never really had a chance to look back there so i dont know if fire was coming out or what... anddddd... how do you get tht pop thing you see on race cars?... thanks

*NemeGuero* · 01-07-2006, 12:49 PM

Back firing normally means you're running too rich. It's unburnt fuel that makes it out of the cylinder.

The noise you hear from race cars is an ignition misfiring system. Get a rev limiter and drive around all day at redline. You'll hear all kinds of pops.

mxykn · 01-07-2006, 12:57 PM

thanksss

MadChild · 01-07-2006, 01:01 PM

Usually means running rich. I would just get a dyno and get it tuned. A well tune car shouldn't back fire at all. Or thats what we all hope for.

RedtopTech · 01-08-2006, 07:20 AM

From my experience just about any motor with a large free flowing exhaust will backfire during engine breaking. Engines lean out during engine breaking because the fuel is not needed though there is enough to cause rich exhaust gas which will burn in the exhaust causing a backfire. There are a couple factors that can make the backfire worse such as a leak in the exhaust system, sticking injectors, high resistance in the ignition system causing the fuel not to burn completetly

01-07-2006, 12:44 PM	#1
mxykn Join Date: Nov 2005 Location: torrance Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	Backfire sorry for the noobness but i was wondering if backfire was bad for the engine... i hav an sr swap in my 92 240 with full 3 inch piping for the exhaust (strait pipe too)... when i stay in the same gear for a while (20 seconds maybe) not pressing on the gas my car will backfire really loud... really really loud... i never really had a chance to look back there so i dont know if fire was coming out or what... anddddd... how do you get tht pop thing you see on race cars?... thanks

01-07-2006, 12:49 PM	#2
NemeGuero No more nissan. Join Date: Jan 2003 Location: RAIN, Washington. Age: 40 Posts: 8,132 Trader Rating: (10) Rides Gallery: NemeGuero Feedback Score: 10 reviews	Back firing normally means you're running too rich. It's unburnt fuel that makes it out of the cylinder. The noise you hear from race cars is an ignition misfiring system. Get a rev limiter and drive around all day at redline. You'll hear all kinds of pops. __________________

01-07-2006, 01:01 PM	#4
MadChild Leaky Injector Join Date: Jul 2003 Location: MN Age: 40 Posts: 58 Trader Rating: (0) Feedback Score: 0 reviews	Usually means running rich. I would just get a dyno and get it tuned. A well tune car shouldn't back fire at all. Or thats what we all hope for. __________________ '90 240SX w/SR20DET

01-07-2006, 12:57 PM	#3
mxykn Join Date: Nov 2005 Location: torrance Posts: 2 Trader Rating: (0) Feedback Score: 0 reviews	thanksss

01-08-2006, 07:20 AM	#5
RedtopTech Zilvia Member Join Date: Dec 2005 Location: Virginia Beach, VA Age: 40 Posts: 293 Trader Rating: (0) Feedback Score: 0 reviews	From my experience just about any motor with a large free flowing exhaust will backfire during engine breaking. Engines lean out during engine breaking because the fuel is not needed though there is enough to cause rich exhaust gas which will burn in the exhaust causing a backfire. There are a couple factors that can make the backfire worse such as a leak in the exhaust system, sticking injectors, high resistance in the ignition system causing the fuel not to burn completetly