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GEAR
May 27, 2008 10:03:43 GMT -5
Post by hodge711 on May 27, 2008 10:03:43 GMT -5
IM RUNNING ABOUT 8500 RPM WITH A 3.36 AND 205/60 TIRES IN SECOND GEAR. HOW MUCH DIFFERNCE IN RPM WOULD IT MAKE IF I RAN 235/60 TIRES. OR LEFT THE 205/60S AND RUN A 4.11 IN THIRD. THANKS FOR INFO
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GEAR
May 27, 2008 12:25:22 GMT -5
Post by jeffries on May 27, 2008 12:25:22 GMT -5
Try running 215/60's with the 3.36 in second. Thats what im running and turning about 7300 rpm. I tried out the 4.11 in third with 22.5/7.0 american racers and it dropped my rpm to about 6000. It also depends on how big of a track you are running.
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GEAR
May 28, 2008 9:50:05 GMT -5
Post by hodge711 on May 28, 2008 9:50:05 GMT -5
IM RUNNING A 1/4 MILE TRACK. HOW MUCH POWER DID YOU MAKE CAUSE I JUST GOT A NEW MOTOR AND MY OLD ONE DIDNT RUN ANYWHERE NEAR THE RPM. I GOT THIS NEW ONE AND IT PICKS UP RPM FAST.
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GEAR
May 28, 2008 10:30:07 GMT -5
Post by jeffries on May 28, 2008 10:30:07 GMT -5
Im not sure how much power im making but I run a 3/10 mile track and on that small of a track my car didnt have the power to keep the rpm up with the 4.11 but, I couldnt stay in the gas through the turns either. On a quarter mile you might be ok with a 4.11 and 205's. Or you could still try going up to 215's and keeping your 3.36 and second gear. If you can turn the 4.11 and you still need more gear after trying 215's with the 3.36 you could try a 3.70 and third gear, and 205's. All you can do is try..
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GEAR
May 28, 2008 16:57:41 GMT -5
Post by hydroli on May 28, 2008 16:57:41 GMT -5
You take your current tire diameter, divide it by the newer tire diameter. Keep the result and multiply the RPM of the speed you want to run with the previous result. You'll find the exact rpm it will rev.
I don't know tires measurements so I'll take fake numbers for the example but the calculation is the same.
current tire = 24" diam newer tire = 26" diam
24 / 26 = .923
rpm = 8500
8500 x .923 = 7846 rpm
Hope this helps
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GEAR
May 28, 2008 19:27:07 GMT -5
Post by troyk3 on May 28, 2008 19:27:07 GMT -5
Hey Hodge, I am running a 336 with the 215 tires and I am only running about 7300 rpms I know with the 205's it seemed like I was close to 7800 Dont know if that helps. I know I would like to try a 362 and see if it would work or be to much
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GEAR
May 29, 2008 15:45:24 GMT -5
Post by hodge711 on May 29, 2008 15:45:24 GMT -5
yea i think im gonna try the 215s cause i guess i need to suck it up and buy hoosiers any way.
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