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Thread: Terminator Stealth EFI/Pontiac 400 ECU controlled timing options?

  1. #1

    Default Terminator Stealth EFI/Pontiac 400 ECU controlled timing options?

    I have recently gotten my car started up & running using Holley Terminator Stealth EFI setup is a '70 Pontiac 400 approximately 10.5 Comp flat tappet 225° @ 0.50 duration cam, headers, Torker 2 intake. I'm using an HEI distributor with MSD Digital 6AL box timing is set at 14° at idle vacuum advance is on the ported port. I'm having a few issues the main issue is going from park to drive the car just shuts off I'm going to try and smooth out the idle AFR a little bit and see if I can get it better. Also sometimes the car will start and shut off or start and hunt around, then shut off. I have the hot idle is set around 900 and the IAC kind of moves around from 3-10%. I believe it's trying to compensate for idle dip as the timing moves around a degree or 2 and fluctuates the RPM a little bit. I would really like to go with ECU controlled timing at this point. I think it will help the car run better. I know they the sell Holley dual sync distributors, but all the Pontiac ones they sell have a steel distributor gear. I need iron, can I just get a dual sync and switch the gear from my HEI? I have a few different things I'm going to try, but I'm starting to think without the timing control it's going to be an issue in & out of gear. FWIW, I have the same system on my '70 Mach 1 manual transmission and ECU controlled timing through the TFI distributor. From the start that car has started up and had a good idle with no tuning other than self Learning in Closed Loop.
    Last edited by 70MACHONE; 05-12-2019 at 11:17 AM.

  2. #2
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    Quote Originally Posted by 70MACHONE View Post
    I know they the sell Holley dual sync distributors, but all the Pontiac ones they sell have a steel distributor gear. I need iron, can I just get a dual sync and switch the gear from my HEI?
    You can if they're the same distributor shaft diameter.
    (Please don't type your posts like you're texting. It takes me a long time to edit it. At least use Spell Check before posting.)
    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/2500 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.

  3. #3

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    It seems like the Pontiac HEI distributor gear is .490" and the the Holley dual sync is .500", so I'm assuming that won't work. What would you recommend?

  4. #4
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    Find a Pontiac iron distributor gear, or use a bronze gear.
    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/2500 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.

  5. #5

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    I don't really want to use a bronze gear due to hearing they wear quickly. It's difficult to find a Pontiac .500" cast iron gear. The only thing I've found is MSD 8531 may work.

  6. #6
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    Well if Chevy & Pontiac use the same distributor gear, then there's your answer. I'm not a Pontiac guy, so you'll need to investigate this.
    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/2500 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.

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