06-11-2007 | #11 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Thought on Headers
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Any pics of the headers from PFE? Do they have a website and what was the cost if I could ask? As for the exhaust popping, you may want to check for air leaks. Also, invoking DFCO and DE routines in ECM will cut down amount of gas on decel. What year is your Z? |
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06-11-2007 | #12 | |
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Re: Thought on Headers
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06-11-2007 | #13 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Thought on Headers
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mrzr, Where do you hear the popping? From the rear or under the car? |
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06-12-2007 | #14 | |
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Re: Thought on Headers
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06-12-2007 | #15 |
Join Date: Jun 2004
Location: Mi
Posts: 57
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Re: Thought on Headers
No pics of the headers and I bought them 5-6 years ago and bought the last set they had laying in storage. They looked just like the stock headers minus the cats.
Price then including install was $900. PFE stand for Performance Fabrication Engineering and they fab custom exhausts and also install aftermarket exhausts. What is the recommed way to disconnect the air pump if I should opt to do it?
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1990 Red on Red vin #2433 |
06-12-2007 | #16 |
Join Date: Jun 2004
Location: Mi
Posts: 57
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Re: Thought on Headers
I plan to contact Mark Haibeck re doing the fix to my prom. Thanks for the suggestion.
As for where is the backfire occurring it is inside the exhaust sys. I tend to downshift a lot when braking so my driving style may be a contibuting factor. I have spotted flames coming out of the exhaust tips in an autocross when my son drove the car. The last leg before stopping was a short accelleration followed by a pylon garage with a sudden stop. So, when he did a quick accel followed by immediate brake the excess fuel ignited and shot flames out of both sides exh tips. I want to elimiate this though and it probably isn't good for the exh sys either.
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1990 Red on Red vin #2433 |
06-12-2007 | #17 |
Join Date: Sep 2006
Location: lone pine and mammoth lakes
Posts: 1,407
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Re: Thought on Headers
call mark he can do it .you will have to send him your prom
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06-12-2007 | #18 |
Join Date: Aug 2005
Location: Fishers, IN
Posts: 815
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Re: Thought on Headers
This backfiring is caused by the DFCO (decell fuel cutoff) settings in the stock calibration. The settings call for extreme timing retard when the DFCO is active. The retarded timing, combined with any residual fuel in the cylinders cause the popping.
SImple fix is to disable the DFCO. Second fix is to lessen the spark retard setting. todd |
06-12-2007 | #19 | |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,708
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Re: Thought on Headers
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Agreed its not coming from airpump. mrzzr1, I wrestled with this issue for sometime on my 84. Played with the cal removing fuel with DFCO and DE routines, bumping lower MAP timing etc. Turns out I had a rear muffler/pipe interface that was leaking. Thought it was tight. Needed new clamp. No more popping. |
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06-14-2007 | #20 | |
Join Date: Jul 2005
Location: Auburn, Washington
Posts: 586
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Re: Thought on Headers
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Nick ZR-1 Net Registry Founding Member #32 - lapsed... |
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