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Don't need much rear weight to hook big power, I know my S-10's rear weight is right at 1000#, and with just CalTracs bars and drag radials guys are hooking turbo LSx swaps.
As Homer Simpson says, "here in out forum we follow the laws of physics". You're right, but there is a whole combination of things going on here. Drag slicks are especially good at putting down power, they have a very high coefficient of friction - depending on how much money you spend maybe a lot more. With that and the fact that an S10 is a pretty tall vehicle they can shift most or all of their weight onto the rear tires. So they aren't doing that with 1000 lbs.
The formula ford in my avatar is an entry level race car. Mine had 106 HP and even with sticky slicks it can burn rubber, or at least it will spin the tires ( not much burning because of not much weight on them ). It's about 200 lbs. lighter than a locost but has a bit more rear weight distribution.
It will do this even though it is geared for about 70 MPH in 1st gear. It then shifts at 85 and 100 MPH. That's for a slow track. On a fast track I put in a taller 4th and move the other gears down one and take out the 1st.
I think what that means is that a light car like ours wants close and high ratios. It's not hard to get it moving since it doesn't weigh much. It does't seem to me that you can actually change the ratios much on car transmissions, but I am ignorant on this. For instance I don't think you can just swap the gears around like on my race car ( 3rd to 2nd etc. ).
What would be good for us is something like a close ratio motorcycle transmission that could handle our torque...