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This post is directed at those that track their cars often and have made a couple of changes to the car, and noted the difference, if any.

As I posted in the "another physics question" thread, I am building a decision model to aid in picking the optimal modifcation set, given a certain budget. It uses Microsoft Solver. The objective function is to minimize lap time. In other words, modifications are decided upon based on their effect on laptime as a function of cost.

Three of my decision variables that effect laptime are:

1) Required lbs lost to drop 1 second of laptime.

2) Required HP gain to drop 1 second of laptime.

3) Required lbs of downforce to drop 1 second of laptime.

Clearly, what track you are minimizing laptime on, is important. That is why the three above are variables and not constants.

Here is a recommended format for your reply.

BWR S/C +53 hp, 1 second gain at Leguna Seca

CF Diffuser, -10lbs weight, +5lbs downforce, 8 tenths at Sebring

anything helps.

BTW, the numbers I am using now are 100 lbs/sec weight, 15hp/sec, 30lbs/sec downforce

(edit: up'd DF to 30 lbs.)