Thread: Twin engine GTP project progress thread

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  1. #1 Re: Twin engine GTP project progress thread 
    GrandPrix Junkie Sandman's Avatar
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    Do dual 5 speed Getrag trannies next
    05 Saab 9-2X Linear (Saabaru)
    77 Morris Garage B
    Quote Originally Posted by TLSheff View Post
    You said "I'm done with it"... car says "Oh, really? *trollface*"
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  2. #2 Re: Twin engine GTP project progress thread 
    GTP Level Member TwinV6GTP's Avatar
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    OMG... just back from a test with the 4t80E cadillac transmission on the rear engine setup.
    It is completely retarded now. Cranked up the boost a little on each engine. 1st gear starts in the back, 2nd gear start in front.

    For sure a solid 9 second car on the street, although that is just from the acceleration in 1st to 2nd gear. We didn't shift to 3rd yet that is the next step.
    The worry is the notorious soft 3rd gear shift of that 4t80 trans.

    We made a set of two push switches for shifting 1-to 4th gear. Works awesome but the 1-2 needs to happen so fast if I don't shift within half a second I'm hitting the cutoff.
    So I get a TCM820 box from magnashift and will be using that to do automatic shifting. Everything happens too fast in that car, with two shifters.

    I will keep the front engine manual so I only have to shift to 3rd gear at 90 mph once and that's it.

    The new trans feels much more responsive and puts the power down WAY better. I was expecting more HP loss and to feel the weight of that trans but the fact is I made too much power and had too much traction for the stock 4t65 clutch packs to hold the power. I was definately wasting a lot of HP with the 4t65 in the back.
    2015 Custom Twin Engine Nascar style car with dual GTP 3.8 drivetrain, Front trans 4T65e-HD, Rear 4t80e trans 1/4 mile 8.38 @ 165mph
    2000 GP Twin Engine Twin TD Turbo kits. Stock engines stock trans(s) stock injectors stock MAFs 0-60mph 1.8 seconds 1/4 mile 9.72 @ 139 mph
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