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Thread: Sniper is backfiring.

  1. #11
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    Quote Originally Posted by Deroid226 View Post
    Now I'll check timing. With carb I had about 17° at idle for best vacuum running, I may need more timing now?
    This is user-programmable aftermarket EFI. You have to experiment with tuning. See if the engine likes more idle timing.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  2. #12

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    Have you guys ever tuned it to highest vacuum at idle?

  3. #13
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    I've tried that, but it seems to result in too much idle timing. Of course, every engine is different, so determine what your engine likes.
    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  4. #14

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    Mine always seemed to like more timing. My idle timing is set at 36°.

  5. #15
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    Bostwick, GA
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    How about the usual suggestion? Post a datalog(s) of the issue, along with the Config File.
    Injector Inspector
    USAF 1960-1964
    Drag racing since 1955

  6. #16

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    Quote Originally Posted by Deroid226 View Post
    Have you guys ever tuned it to highest vacuum at idle?
    You can do that, but you'll end up with a ton of ignition timing. I used to do that then I decided to just pick a number for timing and then tune the fuel for the lowest IAC. This method seems to work better. For example, on an engine with a performance cam, I'll probably just pick 20° of timing for idle and then once the engine is warm, I'll put it in Open Loop and adjust the AFR for lowest IAC. Once I know what the engine wants, I update the tables and she should be ready to go.

  7. #17
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    Connecticut
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    May God's grace bless you in the Lord Jesus Christ.
    '92 Ford Mustang GT: Dominator MPFI & DIS, A/C, Spal dual 12" fans/3-core Frostbite aluminum radiator, Pypes dual 2.5" exhaust/X-pipe/shorty headers, 100HP progressive dry direct-port NOS, 160A 3G alternator, Optima Red battery, LenTech Strip Terminator wide-ratio AOD/2800 RPM converter, FRPP 3.31 gears, Cobra Trac-Lok differential, Moser 31 spline axles, '04 Cobra 4-disc brakes, '93 Cobra booster & M/C, 5-lug Bullitt wheels & 245/45R17 tires.

  8. #18

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    Quote Originally Posted by Danny Cabral View Post
    This is user-programmable aftermarket EFI. You have to experiment with tuning. See if the engine likes more idle timing.
    But it's self-tuning. It says so right on the box.

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