Ok doubt there is any real concrete mathematical answer to my question, but any input would be great. Say you have a set hp engine... stock 222hp or 325hp, whatever. Say the car weight is 3500 lbs. Then you bench a few tests like 0-60 and 1/4 mile... is there any way to tell how much weight you would need to reduce your car to lessen your 0-60 by 1/10 sec or 1/4 mile by 1/10 sec (I'm just making up numbers here). Of course all other factors would have to be equal. Like say you dropped your weight 200 lbs to 3300, how do you think that would that change your numbers?