changed from a 26" to 28" tire................
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changed from a 26" to 28" tire................
went to the track after changing tire sizes from a 26" 275/50/15 to a 28" 275/60/15 mt dr. figuring I would mile an hour a little better and did just the opposite. went from a consistant 11.9x to a 12.3xx and from 114mph to 109mph. i guess its time to change gear ratio in the 9" to a 4.11 or 4.30 (i have a 3.70 btw). alittle disapointed in a way,but gears are cheaper than a new set of mt dr's.
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the air was at 3200ish. KCIR 6/4/2008 7pm-9pm , track temp was 101* and the car was dead hooking. played with the suspention for a bit but all the runs were carbon copy of each other. i'm doing some math with my 60's and 330's to see whats up.
Last edited by dlove; 06-05-2008 at 02:39 PM.
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i was trapping 109mph all night. rev is set a 6400rpm. on the 26" tire i would trap 6,000 rpm and now w/ the 28" i trap at 5600rpm (which i had planned on). this winter i was going to do a new cam (trex or ms4) and planned to upgade to a 4.30 gear anyway, but a 4.11 for now. oh so much wasted money lol.
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The 26's were probably better for getting you through the run at near the power point at the end versus the 28's and losing a bit in the rpm range.
Derek
Derek
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why would you think your mph would go up going from 26s to 28s...
that would be like saying going from 3.73s to 2.73s would increase your MPH it is quiet the opposite...
that is why i didnt wanna have to go to 28s yet cause it is going to knock my mph down...without a gear change
that would be like saying going from 3.73s to 2.73s would increase your MPH it is quiet the opposite...
that is why i didnt wanna have to go to 28s yet cause it is going to knock my mph down...without a gear change
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Alan it seems to me that going from 3.73s and 26s to 4.10s and 28s would be a wash but if you picked up 2mph thats awesome. I recently went to the track to test out my combo ran all motor 4000 nitrous converter (tight) 275/60/15 drag radials 28in ran a best of 4 passes 11.4 @ 119 mph 96 1/8 on a 1.731 sixty the car would not leave hard. I just put some 4.10's in and was thinking of running a 26in tire for motor runs then switch to 28's for the spray hoping the car will leave harder on motor and pick up some et and mph. Last resort will be have the stall loosend up a little. The car has all the good suspension stuff.
What you think ?
What you think ?
Last edited by BADHAWK51; 06-16-2008 at 09:19 PM.
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Alan it seems to me that going from 3.73s and 26s to 4.10s and 28s would be a wash but if you picked up 2mph thats awesome. I recently went to the track to test out my combo ran all motor 4000 nitrous converter (tight) 275/60/15 drag radials 28in ran a best of 4 passes 11.4 @ 119 mph 96 1/8 on a 1.731 sixty the car would not leave hard. I just put some 4.10's in and was thinking of running a 26in tire for motor runs then switch to 28's for the spray hoping the car will leave harder on motor and pick up some et and mph. Last resort will be have the stall loosend up a little. The car has all the good suspension stuff.
What you think ?
What you think ?