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Thread: My Dual TBI Camaro Project

  1. #76
    Fuel Injected! gregs78cam's Avatar
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    Mark can you post up the two .bins? Or even just what the 5 bits changed from to. I was going to try exactly what you did, but couldn't figure out how to open/run the program at 2AM this morning.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  2. #77
    EFI GearHead ! EagleMark's Avatar
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    Like the new avatar!

    Here's the bins, it also updates checksum when done. It's an old program that does .LT1 and .bin so it may have been part of LT1 edit or that other free one that went away years ago, I have it in a seperate folder when I installed it, may need to do it again with a rightup or something because I don't see a read me file with it. Does not look like I have compatibility set up on it?
    Attached Files Attached Files

    1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
    1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
    -= =-

  3. #78
    EFI tuning addict 96lt4c4's Avatar
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    Wow, this is a cool project. Makes me want to build one. Sorry to dig up an old thread.

    How is the car running, how much HP are you making?

    You may get a little more air flow if you install the 1/4 pod spacer. That helps get the injectors up out of the bores a little. Also machine the top of the TB flat helps too.

    -1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
    -2002 Cavalier, Tuned with HP Tuners
    -1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)

  4. #79
    Fuel Injected! gregs78cam's Avatar
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    Thanks. It runs pretty well. I have been wanting to change the fuel pressure a bit and start on a new tune for it and see if I can get a couple of very small drivability issues eliminated, but I just don't have the time and I can't justify $100 in gas just to make it run a little better. It made 340hp on a chassis dyno with carb and T56. I don't drive it much, and have actually contemplated selling it to finance another project.

    As far as air flow, right now the limiting factor is the small air filter I have on it so I can keep the scoop on it. The two stock TBI's together are capable of way more flow than this engine needs. The idea behind running two was more for the fuel flow that this thing needs, without having to run BBC injectors at a crazy pressure.
    Last edited by gregs78cam; 08-05-2012 at 07:01 PM.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  5. #80
    EFI tuning addict 96lt4c4's Avatar
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    Quote Originally Posted by gregs78cam View Post
    Thanks. It runs pretty well. I have been wanting to change the fuel pressure a bit and start on a new tune for it and see if I can get a couple of very small drivability issues eliminated, but I just don't have the time and I can't justify $100 in gas just to make it run a little better. It made 340hp on a chassis dyno with carb and T56. I don't drive it much, and have actually contemplated selling it to finance another project.

    As far as air flow, right now the limiting factor is the small air filter I have on it so I can keep the scoop on it. The two stock TBI's together are capable of way more flow than this engine needs. The idea behind running two was more for the fuel flow that this thing needs, without having to run BBC injectors at a crazy pressure.
    I had a problem running a carb manifold, I think you need the heat from the stock type TBI manifold to keep the TBI warm. I was running a Performer RPM air gap and could not get it to run right. I think the TBI was freezing up. I ended up boring out the stock manifold and TBI to 2 inch and running the BBC injectors on my 383. Much better drivability. This is just my guess as to what was going on, it could have been my lack of tuning skills too...

    -1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
    -2002 Cavalier, Tuned with HP Tuners
    -1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)

  6. #81
    EFI tuning addict 96lt4c4's Avatar
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    Did you look into trying this with a dual 4 barrel carb intake?

    -1999 Hugger Orange SS, LS2 402 T56, 9 inch Ford 3.90 gears, Tuned with HP Tuners
    -2002 Cavalier, Tuned with HP Tuners
    -1994 Full Size Blazer ,383 TBI 4L60E, 4.10's, Tuned with Tunerpro RT (Where it all began)

  7. #82
    Fuel Injected! gregs78cam's Avatar
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    Once I got the injector flow correct for the injectors it did still take a lot of AE to get it right.

    I thought about a dual quad intake but it just wasn't in the budget.
    Last edited by gregs78cam; 08-06-2012 at 06:17 PM.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

  8. #83
    Fuel Injected! gregs78cam's Avatar
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    Just a little update. I was noticing last year that at a warm idle the Injector PW was as low as it would go, and the 5.7L injectors were still putting out too much fuel, which you could see in the WBO2. After Mark figured out the Injector Duty Cycle was off, I fixed that in my ADX, and did a log. I found that I was only reaching around 60% DC. So that means I have the ability to add another almost 50% more fuel through pulse width. The idea was to remove the 5.7L injectors and put in a full set of four 4.3L injectors, which is a 25% decrease in flow at the same pressure and pulse width. Yesterday before work I swapped them. I drove it to work today, and it ran a LOT better. It idles warm right around stoich in OL. I don't know why yet but it dropped out of CL in the parking lot, otherwise I would have checked the BLM/INT at idle to make sure it was good. Decel Unleanment, and DFCO work better now. I think it still needs a little more AE from the smaller injectors, but so far results are good. I need to eventually get WOT checked, and probably re-mapped, but that will come later. If I end up needing more fuel than I have PW for at WOT then a VRFPR will be put in, and re-tuned.
    1978 Camaro Type LT, 383, Dual TBI, '7427, 4L80E
    1981 Camaro Z-28 Clone, T-Tops, 350/TH350
    1981 Camaro Berlinetta, V-6, 3spd
    1974 Chevy/GMC Truck, '90 TBI 350, '7427, TH350, NP203, 6" lift, 35s

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