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Thread: Revisiting spark advance to optimize ...NEED SMART EYEBALLS....

  1. #31
    "Former Delorean owning Guru" Spittybug's Avatar
    Join Date:  Jun 2011

    Location:  Hill Country, TX

    Posts:    1,579

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    Quote Originally Posted by FABombjoy View Post
    You really don't want to pull timing there unless you intentionally want a crackly exhaust note or to shoot fireballs.
    Thanks, I'll look at the tables. So leaving the advance during decel is actually preferred then? Just cut back fuel.....
    Owen
    I.Brew.Beer.

  2. #32
    '82 T3 FABombjoy's Avatar
    Join Date:  May 2011

    Location:  Lansing, MI

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    If you’re too lean you’ll pop bang gurble. If you’re going to put any fuel in, you need enough so it doesn’t lean misfire or it’ll afterfire. Unless you want that - some people like the sound but it’s too much for me

    Kjet does this pretty predictably, I assume more so if the decel valves are soldered shut. When I was running kjet turbo with the decel valves closed up I could goose the throttle and after fire all day long at idle.

    Launch control or anti lag will really demonstrate the effect of late timing!
    Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection

  3. #33
    "Former Delorean owning Guru" Spittybug's Avatar
    Join Date:  Jun 2011

    Location:  Hill Country, TX

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    No table switching in MS2e, just additive. I'll simply bake in the idle landing trough. This isn't far from the actual table I'm running on. I notice you have your centrifugal advance all in by 3000 RPM. No ill effects I trust? Most car guys say that is the magic number but I know our stock setup rode it out to 4000.

    How much can you dial the fuel back on decel without issue? I suppose if there is no fuel in there to speak of then there is no risk of knocking the engine. No ill effects of sparking with no fuel that I can think of.....

    I just picked up my new DMCH fuel pump setup today so I'll be installing that over the wet weekend here. I should be able to get some timing changes made after that and see if I can get this dialed in. The next brain pick will be on AE curves. I like to use pretty much 100% TPS, but getting the PW and duration just right is a challenge. I played with it a few years ago and somehow managed to get something very right; good head snapping acceleration (but I've since tinkered it away) - so I know it is achievable!
    Owen
    I.Brew.Beer.

  4. #34
    '82 T3 FABombjoy's Avatar
    Join Date:  May 2011

    Location:  Lansing, MI

    Posts:    1,168

    My VIN:    10270

    How about that, guess I do have a few degrees of timing in a little early. Seems to work and is probably still in the acceptable window of the Volvo curve.
    Luke S :: 10270 :: 82 Grey 5-Speed :: Single Watercooled T3 .60/.48 :: Borla Exhaust :: MSD Ignition :: MS3X Fully SFI Odd-fire EFI :: DevilsOwn Methanol Injection

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