Recent Autocross Experience - Page 2 - TCCoA Forums

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post #31 of 37 (permalink) Old 05-15-2017, 09:33 PM
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2-foot driving isn't going to make any difference with an AOD, as the converter locking isn't computer controlled. With that being said, the AOD is not a good choice in the first place for autocross, and with a non-locking high stall converter, and a wide ratio gearset, what you have is a straight-up drag racing trans, so it's no surprise that you can't put the power down coming out of the corner. Converting to a 5-speed will make a night and day difference on the autocross, or if you want to keep it an auto, you should do a true 4r70 swap and run a tighter converter, and that will allow you to control the gearshifts and converter locking with the tune so that you don't light the tires up coming out of every turn.
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post #32 of 37 (permalink) Old 05-16-2017, 01:15 AM
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Originally Posted by MadMikeyL View Post
2-foot driving isn't going to make any difference with an AOD, as the converter locking isn't computer controlled. With that being said, the AOD is not a good choice in the first place for autocross, and with a non-locking high stall converter, and a wide ratio gearset, what you have is a straight-up drag racing trans, so it's no surprise that you can't put the power down coming out of the corner. Converting to a 5-speed will make a night and day difference on the autocross, or if you want to keep it an auto, you should do a true 4r70 swap and run a tighter converter, and that will allow you to control the gearshifts and converter locking with the tune so that you don't light the tires up coming out of every turn.
Q: What about converting his valve body to manual control? Would that give him the control he needs?

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post #33 of 37 (permalink) Old 05-16-2017, 12:39 PM
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post #34 of 37 (permalink) Old 05-16-2017, 02:00 PM
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I cycle between two foot driving with autos(aka left foot braking), it certainly makes a good auto more fun to drive, but not sure how much of a measurable difference it truly makes though.

Manual valve body won't make a non-locking converter lock up or change the ratios.

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post #35 of 37 (permalink) Old 05-16-2017, 04:27 PM
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TC not locking is a good thing, if you're slowing that much on corners; MM, try it in an empty parking lot, and see what you think.

I think it helps a lot, personally.

If you trailer it, some really sticky tires could help; the BFG Comp2 tires I have pick up gravel off the parking lot, they're nice street tires, I can only imagine the racing tires.

I get ~30k out of the comp2's...

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post #36 of 37 (permalink) Old 05-16-2017, 07:55 PM
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With a stock motor and stock stall, TC being unlocked might be a good thing. With the probably 350lb-ft of torque his modified engine is making at 3000rpms, and the fact that torque is now being multiplied by the converter by as much as 2x, and then multiplied by the steeper gear ratio of the 4r70 gearset in the trans, and then multiplied by the steeper 3.73 gears, the result is going to be lighting up the tires with anything but the slightest throttle input when coming out of the corners. For drag racing, all that torque multiplication is a good thing, but for what he is doing, a locked converter, and narrow spread between the gears would be much better.
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post #37 of 37 (permalink) Old 05-16-2017, 08:05 PM Thread Starter
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With a stock motor and stock stall, TC being unlocked might be a good thing. With the probably 350lb-ft of torque his modified engine is making at 3000rpms, and the fact that torque is now being multiplied by the converter by as much as 2x, and then multiplied by the steeper gear ratio of the 4r70 gearset in the trans, and then multiplied by the steeper 3.73 gears, the result is going to be lighting up the tires with anything but the slightest throttle input when coming out of the corners. For drag racing, all that torque multiplication is a good thing, but for what he is doing, a locked converter, and narrow spread between the gears would be much better.
Yep. I think that about explains it.

Now find me a set of pedals and I'll consider doing a manual swap.
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