Quick but important track question . . .

I have been told that there is a formula to determine based on the gear ratio that you have and the tire high what the effective gear ratio.

Does anyone has this information can you please provide it.

I meant what the effective gear ratio is.

I heard from a guy with a mustang thats is all about making his time better for the quarter mile.... is that running smaller wheels (the drive wheels) will change the gear ratio in a way. but the way he said it sounds a lot better than what i put it but it seems to make sense to me. DO you understnad what im trying to say?!

That is what I mean, on his case are the rear tires. In my case are the front ones. I am looking for 185/40r16 on the original wheels(if those exist with treadwear 240 or less).
Is that I have a bud that run RC's and they use that formula based on the car he will run against.
At the moment when he mentioned it did not had the details.
The thing is that the other day on the highway a Jetta gave me a hardtime. Really hard time, cause I did not had enough low end power to get by him just trail him and bad shifting on the perfshift setup on my car, when we reached the 100mph then was easy for me to get by but if I am going to the track that is not good since track does not have long straights. I need to raise the gear ratio from 2.93 to something better. I still have the other tranny OEM gears so I could install those on this one but I do not want to change the gears every track day. 2.93 gives me a great MPG. It has enhanced more than 1.5 MPG Highway and 1.1 on city.
I will not give up that but in the track I will be dead meet.

meat. Sorry