Backfires when shifting - ZR-1 Net Registry Forums

c4zr1 · 10-31-2011

I have a Corsa exhaust and a Mark Haibeck chip. When I shift from 1st to 2nd, 2nd to 3rd, and 3rd to 4th I get a backfire which is very annoying and embarrasing. I was wondering if a leak in the exhaust system is causing it. I am thinking about getting the exuast system welded up.
I have read that Mark's chip elliminates the backfire.
Any help is appreciated.

Thanks!
Don

XfireZ51 · 10-31-2011

Quote:

Originally Posted by c4zr1

I have a Corsa exhaust and a Mark Haibeck chip. When I shift from 1st to 2nd, 2nd to 3rd, and 3rd to 4th I get a backfire which is very annoying and embarrasing. I was wondering if a leak in the exhaust system is causing it. I am thinking about getting the exuast system welded up.
I have read that Mark's chip elliminates the backfire.
Any help is appreciated.

Thanks!
Don

Yes check for leaks. I'm assuming backfire is in exhaust, right? Also could take some fuel out of lower MAP regions in decel.

c4zr1 · 10-31-2011

Yes it is the exhaust that is backfiring. Can the exhaust system be wlded up in place?

secondchance · 10-31-2011

Quote:

Originally Posted by c4zr1

I have a Corsa exhaust and a Mark Haibeck chip. When I shift from 1st to 2nd, 2nd to 3rd, and 3rd to 4th I get a backfire which is very annoying and embarrasing. I was wondering if a leak in the exhaust system is causing it. I am thinking about getting the exuast system welded up.
I have read that Mark's chip elliminates the backfire.
Any help is appreciated.

Thanks!
Don

From what I understand, throttle off decel creates a lean condition that results in backfire. When I had my chip reburnt, after the header install, I opted for decel enrichment option that pretty much eliminated backfire.

XfireZ51 · 10-31-2011

Decel creates a vacuum in the exhaust which sucks fresh air into the exhaust if there is a leak. Any unburnt gases get ignited with the heat and oxygen mixture. DFCO eliminates the excess fuel. If you have popping on decel, you can reduce fuel in the CLOSED PORT Throttle VE table at the 20-25 kPa cells.

10-31-2011	#1
c4zr1 Join Date: Nov 2005 Location: Amarillo, Texas Posts: 47	Backfires when shifting I have a Corsa exhaust and a Mark Haibeck chip. When I shift from 1st to 2nd, 2nd to 3rd, and 3rd to 4th I get a backfire which is very annoying and embarrasing. I was wondering if a leak in the exhaust system is causing it. I am thinking about getting the exuast system welded up. I have read that Mark's chip elliminates the backfire. Any help is appreciated. Thanks! Don

10-31-2011	#3
c4zr1 Join Date: Nov 2005 Location: Amarillo, Texas Posts: 47	Re: Backfires when shifting Yes it is the exhaust that is backfiring. Can the exhaust system be wlded up in place?

10-31-2011	#5
XfireZ51 Join Date: May 2007 Location: Chicagoland, IL Posts: 9,708	Re: Backfires when shifting Decel creates a vacuum in the exhaust which sucks fresh air into the exhaust if there is a leak. Any unburnt gases get ignited with the heat and oxygen mixture. DFCO eliminates the excess fuel. If you have popping on decel, you can reduce fuel in the CLOSED PORT Throttle VE table at the 20-25 kPa cells.