Rear tire size Question?
Rear tire size Question? I think I am running out of gear in the 1/4. My MPH is 117 with 4.10 gears. I am running Nitto 555r extreem drags on the car 275/40/17's. What is the tire OD on that combo? I thought it was 26", but was recently told it is 25". I am looking for another tire possibly et streets. will a 26 et street give me any more mph? or do I need a 27"?
The 27" will not give you more MPH, it will give you less due to the fact that you are taking gear away. I would look into the MT Drag Radials as they are a MUCH better tire than their ET Streets. They have them in a 28" size now for the 17" rims.
Originally Posted by davered00ss
I think I am running out of gear in the 1/4. My MPH is 117 with 4.10 gears. I am running Nitto 555r extreem drags on the car 275/40/17's. What is the tire OD on that combo? I thought it was 26", but was recently told it is 25". I am looking for another tire possibly et streets. will a 26 et street give me any more mph? or do I need a 27"?
http://www.f-body.org/gears/
It shows that at 117 mph, a car with those tires (25.66") and 4.10's is at 6300 rpm. Go figure.
Last edited by ShevrolayZ28; Jun 3, 2007 at 11:55 PM.
It's an average but it's an average over the last 66 feet. If your trap reads 117 you're probably passing the first MPH light at 116+ and going out the end less than 118. You're just not accelerating that violently so near the end of the 1320.
Just to clarify the post that Matt D made. You will get more MPH out of a taller tire given the same RPM however taking gear away via increasing tire diameter will make you accelerate more slowly during the entire pass possibly hurting your final MPH.
Just to clarify the post that Matt D made. You will get more MPH out of a taller tire given the same RPM however taking gear away via increasing tire diameter will make you accelerate more slowly during the entire pass possibly hurting your final MPH.
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dave your gears are fine i was trapping 125+ this weekend on my 26" hoosiers and still had rpm left
4.10's w/ a 26" tire can go close to if not 130
26x10.5 et street is what you'd want i think
4.10's w/ a 26" tire can go close to if not 130
26x10.5 et street is what you'd want i think
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Originally Posted by Smokinstorm
Just to clarify the post that Matt D made. You will get more MPH out of a taller tire given the same RPM however taking gear away via increasing tire diameter will make you accelerate more slowly during the entire pass possibly hurting your final MPH.
Something else to keep in mind is this: are you hooking off the line ok? If not, that will tend to make your mph higher which could be the reason your running out of gear. If you simply go to 26" M/T ET Streets, you may hook better. And the ET's will "grow" alittle at higher speeds giving you the gear ratio you are needing through the traps. Try, 26" ET's. If that doesn't work go to 27".
Originally Posted by badpewter-z
dave your gears are fine i was trapping 125+ this weekend on my 26" hoosiers and still had rpm left
4.10's w/ a 26" tire can go close to if not 130
26x10.5 et street is what you'd want i think
4.10's w/ a 26" tire can go close to if not 130
26x10.5 et street is what you'd want i think
Just thinking here. 
Originally Posted by badpewter-z
dave your gears are fine i was trapping 125+ this weekend on my 26" hoosiers and still had rpm left
4.10's w/ a 26" tire can go close to if not 130
26x10.5 et street is what you'd want i think
4.10's w/ a 26" tire can go close to if not 130
26x10.5 et street is what you'd want i think
When are you going up again to get that 10 sec slip?
Originally Posted by davered00ss
When are you going up again to get that 10 sec slip?
