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03-25-2009, 12:14 PM
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#1 |
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1/4 mile...RPMs??? HELP
I have an 1/8 mile bracket car. It's a '67 camaro, 2700 lbs. wet, small block , powerglide , 14/32 tires with a 538 gear. Does anybody know what my RPMs might be running a 1/4 mile?
Last edited by watsongarage; 03-26-2009 at 01:27 PM. |
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03-26-2009, 02:12 PM
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#2 | |
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Re: 1/4 mile...RPMs??? HELP
Quote:
If you know what your 1/8mile ET and MPH is you can determine your approximate 1/4 mile ET and MPH. One quick way to estimate is to look at the index system for the NHRA classes. Once you have an approximate 1/4mi. MPH use the following formula. It will be failry close, will vary some depending on the slippage in your convertor. rpm = (mph x gear ratio x 336) / tire daimeter. Hope this helps.... Ron 33 S/C
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03-26-2009, 06:00 PM
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#3 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
This wont answer your question i dont think..
but another way to find out what your car will run in the 1/4 is to multiply your 1/8 mile time by 1.55 |
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04-07-2009, 12:15 PM
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#4 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
I only gain 400-500 RPM's out the back in the 1/4 over what I'm turning at the 660' mark, but my car is heavier, and slower accelerating than yours, I'm sure.
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"Despite the high cost of living, it remains popular." Dave Cook NHRA N375 |
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04-13-2009, 09:12 PM
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#5 | |
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Re: 1/4 mile...RPMs??? HELP
Quote:
I have a ventura (looks like a nova) 2680 lbs going down the track, glide, 5.13s 29.5 tire, the 1/4 strip was 6500 on the money. blew the motor put in a different motor, less cam etc. same running gear and it turned about 6300, just install 4.56 and now 5900. Maybe this will give you some idea |
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04-21-2009, 10:56 AM
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#6 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
4.56 gears and 28" tires. 6,000. You may be turning 6,500 to 7,200.
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04-22-2009, 12:19 PM
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#7 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
go to TCI AUTOMOTIVE.COM they have some very good racing, rpm and e.t type calculators and so far have been very very consistant. its under racing calculators.. hope this helps........phil
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04-22-2009, 01:55 PM
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#8 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
HERE IS THE LINK----WWW.TCIAUTO.COM----GO TO TECH INFORMATION,RACING CALCULATORS
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01-28-2010, 03:43 AM
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#9 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
I'm guessing about 7000-7200.
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01-28-2010, 11:33 AM
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#10 |
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Re: 1/8th mile car running a 1/4th mile...RPMs???
Search the net for wallace racing they have all kinds of calculators to figure out a bunch of stuff. I think its Wallaceracing.com or something like that look under calculators.
Rob |
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