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Intermittent back fire under boost


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#1 mbruneaux

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Posted 18 March 2018 - 05:54 PM

Under boost (14 or 15 psi) I sometimes get a single backfire when revs are climbing no specific but above 3500. Lambda gauge reads about 11, New plugs, wires and a known good distributor. I couldn't tell you what kind of plugs they are. Car pulls really hard and feels great.

SS valves, Ported exhaust manifold, Chads upgraded f/I with precision injectors. Lower shores manual boost controller.

Feedback and ideas are  much appreciated.
Canterbury, CT
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#2 croquest87

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Posted 18 March 2018 - 06:42 PM

BUR7EA-11 gap set at .035 easy to try on the cheap! Maybe lean out just a touch

#3 mbruneaux

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Posted 18 March 2018 - 07:25 PM

View Postcroquest87, on 18 March 2018 - 06:42 PM, said:

BUR7EA-11 gap set at .035 easy to try on the cheap! Maybe lean out just a touch

Thanks, I have a Maf-t to install maybe I can lean it out with that. I'm so paranoid of going too lean!
Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel

#4 croquest87

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Posted 18 March 2018 - 08:39 PM

Maybe do the plugs and try it out first could be other things but plugs are easy. Hope you have forged pistons and head studs at bare minimum if you plan on pushing 14-15 +psi

#5 Hoosierquest

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Posted 19 March 2018 - 02:16 AM

I have to run my plugs closer to .030. Think last time set them at .027 actually.
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#6 importwarrior

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Posted 21 March 2018 - 06:58 PM

Vac advance suck test
And gap plugs.
I gap mine at .028

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#7 mbruneaux

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Posted 21 March 2018 - 07:58 PM

I testet vacuum advance and and it's good, I'm checking the gap and installing the the Maf-t
Canterbury, CT
1989 Chrysler Conquest TSi (Project Race Car) Build thread http://www.starquest...opic=147910&hl=
2001 Pontiac Grand Prix GTP (Daily Driver)
2003 Chevrolet Suburban 2500 8.1  To tow the two hay burners
1998 BMW 528i 5 Speed because the Suburban gets 10 MPG

Second place is S*** place , eh.  - Stéphane Peterhansel




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