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Thread: LT1 with Vortech supercharger has low max torque numbers. How do we bump them up?

  1. #1
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    LT1 with Vortech supercharger has low max torque numbers. How do we bump them up?

    So we have LT1 Corvette we just did a cam, pistons and Vortech supercharger. Car runs amazing and is making over 690rwhp but when we first hit the gas the throttle won't open all the way till around 3k. Seems like when we add boost to an LT1 the VTT tables are way off as the max torque numbers are very low. When we bump up the virtual torque (between 1200-3000 rpm) the max torque will go up but the engine torque also goes up. So the engine torque is still higher then the max torque and we get the same results. No full throttle till 3k. After 3k it opens and pulls like a beast.

    Any tips to balance these tables? It seems like bumping the driver demand tables helps but doesn't quite get there. I'll post a couple of my tunes and scans that go with it.
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  2. #2
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    Check your throttle area max vs rpm table before going too much further.

  3. #3
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    OMG, I can't believe that wasn't at a 100% on a Corvette. Good call and thanks I bet that's the issue. On the other hand I still need to get the max torque tables set or the car is going to pull throttle on shifts. I see it all the time.

    Do you guys just keep bumping those VTT tables up under boost?

  4. #4
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    Have you tried increasing your max torque timing tables? I know this directly plays a role in the calculations. I haven't had to mess with it much, but IIRC when I did, a higher value in the table resulted in lower max engine torque calculations. BUT, if I have it backwards don't hold it against me lol.
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  5. #5
    Senior Tuner Ben Charles's Avatar
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    The c7 stingray is about only model that’s limits throttle in that table, z06 and trucks are 100% throughout RPMs.
    When you said RPM it was opening first thing that can to my mind

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  6. #6
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    I knew I had that happen once before and I couldn't remember why. Occasionally I'll run into the VTT tables pulling throttle but it seems to happen more on the street then on the dyno. Seeing my max eng tq so low I knew they needed work and I just figured that was the problem.
    Tripintaz, I'll give that a shot and see if I can raise it a bit. I'll make a couple pulls on Monday and finish this thing up.

  7. #7
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    Just a quick update. Changing the throttle limit got it to open much quicker but the VTT still seems to be holding it back a little. Couple more tweaks should knock it out.