Silver Dollar Raceway "Results"

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Originally Posted by Incontt

Chris should beef up the t56...put the 9" in and do semi aggresive launchs. he will get his 9sec pass and the mph he wants if he adds a little boost. I agree the auto would be much quicker at the track but for what he likes to do, it isnt necessary. For now, he can just watch my track times to get an idea of what his could run with a better rear and auto and then decide if its worth giving up the thrill of shifting. Our cars are close in weight (45#) and close in power output at the same boost level so a lot of comparisons can be made.

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That is correct. Then we can battle out the 6 speed vs. auto! You would win of course,but it would be fun anyway!:cheers:

uh no..seriously, i mean just to get the data. No need on spending the money until you have a good idea of what the results will be (by watching mine).

if you go to a larger tire diameter, you will lose mph, 99% of of the time.

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Originally Posted by Hunter02SS

So if I go to a 28in tall tire and get rid of my 25in tall tire,I will not pick up mph??I have to disagree with you on this!! I am only 6 mph away from my goal. I think I can do it with the power I am at now!:cheers:

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Every car I have ever seen swap to a taller tire has lost mph. By running a taller tire its just like changing your FD. A smaller tire is going to net you a higher mph b/c your rate of acceleration is greater than a taller one, given that you are not running out of gear due to the smaller tire. The only way that you can get a higher mph with a taller tire is with more power. If your not to the point where your current tire is your limitation, then there is no need for larger or wider. With the power and the car you have, a 28" 10.5" tire should do fine. I mean if the 10.5 guys can put down 2000hp or whatever they are and getting that **** in the 4's and 5's (1/8 mile), I see no need for more tire. At the track, a street tire is going to slow you down and your mph can be higher. Most of the time slips I have seen on slicks, a lower et was always at a lower mph, unless there was the ability to get more power down. If you hook sooner you accelerate sooner, not 1/2 way down the track where your mph will be up. Mph is measured at the end of the track in a box. You cross the 1st beam and then through the 2nd and your distance/time is calculated.

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Originally Posted by josh green

Every car I have ever seen swap to a taller tire has lost mph. By running a taller tire its just like changing your FD. A smaller tire is going to net you a higher mph b/c your rate of acceleration is greater than a taller one, given that you are not running out of gear due to the smaller tire. The only way that you can get a higher mph with a taller tire is with more power. If your not to the point where your current tire is your limitation, then there is no need for larger or wider. With the power and the car you have, a 28" 10.5" tire should do fine. I mean if the 10.5 guys can put down 2000hp or whatever they are and getting that **** in the 4's and 5's (1/8 mile), I see no need for more tire. At the track, a street tire is going to slow you down and your mph can be higher. Most of the time slips I have seen on slicks, a lower et was always at a lower mph, unless there was the ability to get more power down. If you hook sooner you accelerate sooner, not 1/2 way down the track where your mph will be up. Mph is measured at the end of the track in a box. You cross the 1st beam and then through the 2nd and your distance/time is calculated.

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That's understandable! Actually with the 9in. rear i am going to have to get a 3.50 gear. Currently i have a 3.23 gear so with the higher gear and taller tire I should be about the same.

3.5 gear is a good gear Chris. you will prolly need adjustable lower control arms as well to center the rear for clearance. i got the BMRs since the adjustment is in the center and has the quieter bushings on the end...not the rod ends like some do.