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#31 |
![]() Join Date: Aug 2006
Location: McLean, VA
Posts: 3,713
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#32 | |
![]() Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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Is you exhaust 2 seperate pipes from the headers back? No sort of cross over correct? You are accelerating at WOT, then shift time comes, does it pop when you press the clutch, or pop when you let off the throttle. You get a pop during slow shifting, this would assume a closed throttle, but if you get a pop as the engine is unloaded while still in WOT fueling mode, thats another. Sounds like a powershift test is in order. Any reports of flaming out the pipes during shifts or if you wind her up in 2nd gear and let off the throttle without touching the clutch and let the engine slow you down. If there is substantial nastyness happening during teh pulldown, couldbe pulling atmosphere when teh entire t-body back plenum is in extreme vacuum conditions, injectors and their sealing could have effects here as well. If adding a touch of fuel via calibration isnt masking anything, its correcting an instability that you introduced from a non-OEM exhaust. I dont see injectors magically failing before during a header install, esp. non OEM 90-92 injectors, but weirder things have happened. Sorry to be so wordy, just trying to talk it out. Not trying to put anyone down, but when you have a customer asking Why? Why? Why? And you dont have an answer supported by your own diagnostics, it's easier to start down the customer down the "common issues-tree" to try an appease said customer. Sometimes the answer should be "I dont know?" bring it in and I'll go through it", this is human nature to some, again not directed at anyone, of necessarily even applies to your issues. I've had to do this with people personally, and some people get nasty when you say "I dont know what your issue is, but after I do a diagnosis I'll have a better idea" When in my head I'm sometimes thinking "Sorry I cant fix your vehicle over the phone, I'm not a mind reader".
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peace Paul ZR-1 Net Registry Member #1494 |
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#33 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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How soon after the header install was the calibration changed or was it concurrent? Any chance we can see Bill's datalog?
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#34 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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Gentlemen,
Thanks so much for all the input; it is GREATLY appreciated! I think the mystery may be solved. I just heard from Marc. He double-checked my file and discovered that anti-backfire did not get enabled on my calibration. I'll ship it to him today and will hopefully be a little less noisy by next weekend. Thanks again! Stay tuned... |
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#35 |
Join Date: Aug 2005
Location: Scottsdale, AZ
Posts: 2,450
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I thought you liked it loud, hopefully that works
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#36 | ||
Join Date: Dec 2012
Location: NC
Posts: 1,786
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I did that with mine after a few days final torque-down, just to make sure that they were seated. Maybe do it while they're still warm. Quote:
http://www.zr1.net/forum/showthread.php?t=23485 FP test is just like checking air in your tire.
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I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG] |
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#37 |
Join Date: May 2007
Location: Chicagoland, IL
Posts: 9,697
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My experience has been that slip fits do exactly that. They slip. Mine are tack welded because they have a tendency to twist from the torquing of the motor.
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[SIGPIC][/SIGPIC]Former Membership Chairman Former ZR-1 Registry - BOD 1972 Corvette 4speed base Coupe SOLD long time ago 1984 Corvette Z-51/4+3 SOLD 1992 Corvette ZR-1 Aqua/Gray #474 SOLD 1992 Corvette ZR-1 Black Rose/Cognac #458 2014 Honda VFR Interceptor DX |
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#38 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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Should have the PROM back from Marc by tomorrow. If the "anti-backfire" feature lives up to its name, then all will be well in my garage.
As long as I can fix my fuse issue, anyway. |
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#39 | |
Join Date: Dec 2012
Location: NC
Posts: 1,786
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That should be an easy fix...
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I'm getting my snappics / threads removed blindly as fast as I can, to get in compliance with copyright / license TOS on the boards here (lots of FSM pages and other copyright / license violations on my part; sorry guys). And thanks to all the guys who didn't whine when I posted those FSM copyrighted / licensed stuff in my threads... ( :thumbsup: [b]and to think I complied with a mod's request to delete a pic of him in a Challenge Car in NCM Museum, so he wouldn't get in hot water)[/b] Thanks to several guys here for sending parts FREE; BearlyFlying, WeGone, Geezer, GoldCylon, and more there, TonyD, mike100, fletchusmc... 1990 #2794; 4L60e Stage V by RPM Transmission, TCI Dedicated TCM, OBX Stainless, Power Effects 3" [IMG]https://lh5.googleusercontent.com/-GHpfzty7DVU/UQn-0Ru2xAI/AAAAAAAAA14/08mz1p4QLD4/s445/Screenshot-5.png[/IMG] |
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#40 |
![]() Join Date: Feb 2014
Location: AZ
Posts: 860
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Not yet. I'm sure I just got something wet under the hood. Dave suggested that I remove the battery and use a hair dryer on the bundle of wires that go through the firewall under there, which I intend to do but haven't yet. Just haven't made it a priority yet since the car has no PROM in it anyway.
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