Pop/miss on decel? - ZR-1 Net Registry Forums

cuisinartvette · 09-10-2007

Heard about the decel/backfire thing on these cars..Supposedly Haibeck tunes stop (car has H. tune).

Never noticed this til I listened to this a few times as its a little "boomy" in the interior but you can hear it .

Does this sound typical or like more of a miss?

(Towards the end of the clip)

http://www.youtube.com/watch?v=iJiF6YLhYgE

Aurora40 · 09-10-2007

You have to specify that you want the anti-backfire thing. I believe all it is is changing the DFCO (decel fuel cutoff) such that when you get off the gas the ECM still provides proper fueling.

I don't think his chips have this by default. He asked me if I wanted it when he tuned mine, but I think the backpopping sounds cool!

Edit: nothing in your clip sounded untoward or abnormal to me

09-10-2007	#1
cuisinartvette Join Date: Aug 2005 Location: San Fernando Valley, CA. Posts: 896	Pop/miss on decel? Heard about the decel/backfire thing on these cars..Supposedly Haibeck tunes stop (car has H. tune). Never noticed this til I listened to this a few times as its a little "boomy" in the interior but you can hear it . Does this sound typical or like more of a miss? (Towards the end of the clip) http://www.youtube.com/watch?v=iJiF6YLhYgE __________________ 1990 ZR1, 142,000 miles-Black on black 4.09's Haibeck chip, 3"exh, K&N, meth inj.

09-10-2007	#2
Aurora40 Join Date: May 2005 Location: Leesburg, VA Posts: 2,713	Re: Pop/miss on decel? You have to specify that you want the anti-backfire thing. I believe all it is is changing the DFCO (decel fuel cutoff) such that when you get off the gas the ECM still provides proper fueling. I don't think his chips have this by default. He asked me if I wanted it when he tuned mine, but I think the backpopping sounds cool! Edit: nothing in your clip sounded untoward or abnormal to me __________________ Bob Saveland Former owner of #2517 [IMG]http://a.random-image.net/aurora40/vette.jpg[/img] Last edited by Aurora40; 09-10-2007 at 02:17 PM.