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Author
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Topic: 1/4 RPM question.
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RPM289
Journeyman Posts: 26
From: Phenix City, AL
Registered: Feb 2002
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posted 04-11-2002 10:16 PM
   
I have a 65 coupe with, C4, 302, 9in. with 5.13 gears, & 29x18.5x15 M/T sportsmans. Any idea what rpm I will be at in a 1/4 mile? I 'm guessing around 7500.Thanks,
Mike ------------------
66' Mustang
95' Lightning
65' Mustang
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65_289
Gearhead Posts: 421
From:
Registered: Jul 2001
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posted 04-11-2002 10:21 PM
quote:
Originally posted by RPM289:
I have a 65 coupe with, C4, 302, 9in. with 5.13 gears, & 29x18.5x15 M/T sportsmans. Any idea what rpm I will be at in a 1/4 mile? I 'm guessing around 7500.Thanks,
Mike
What do you think your trap mph will be? If you know that, then you can plug your numbers into one of those nifty gear ratio calculators and it will tell you.
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SteveLaRiviere
Administrator Posts: 22049
From: Saco, Maine USA
Registered: May 99
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posted 04-12-2002 06:51 AM
Right, that totally depends on your engine.As a frame of reference, 100 mph will be at 6103 rpm. ------------------
'70 Mustang Mach 1 M code 351C 4V/FMX/3.25 open
'72 Mustang Sprint Coupe 351C 4V/FMX/4.30 Trac Lok
'94 F-150 XL 5.8L/E4OD/3.55 Limited Slip
MCA Member # 47773 My wife says I don't pay enough attention to her... or something like that...
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n2oMike
Gearhead Posts: 770
From: Spencer, WV
Registered: Jan 2001
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posted 04-12-2002 05:09 PM
http://www.mustangworks.com/analyzer.htmlYou can try this, but you have to add several hundred rpm for converter slippage. Good Luck!
------------------
Mike Burch
66 mustang real street
302 4-speed 289 heads
10.63 @ 129.3
http://www.geocities.com/carbedstangs/cmml_mburch.html
http://www.fortunecity.com/silverstone/healey/367
http://www.mustangworks.com/cgi-bin/moi-display.cgi?220
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steve'66
Gearhead Posts: 3751
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-12-2002 05:20 PM
Here's a good one for rpms,http://www.ring-pinion.com/c-rpm_1.html
SteveW
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steve'66
Gearhead Posts: 3751
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 04-12-2002 05:25 PM
RPM289 Mike,Your guess will be about right if you hit 120mph in the 1/4. 
SteveW
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RPM289
Journeyman Posts: 26
From: Phenix City, AL
Registered: Feb 2002
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posted 04-12-2002 09:48 PM
quote:
Originally posted by 65_289:
What do you think your trap mph will be? If you know that, then you can plug your numbers into one of those nifty gear ratio calculators and it will tell you.
I have no idea. I haven't had the car to the track yet, first several times will bw 1/8 anyway so I can get some numbers for all those calculators out there.Thanks,
Mike ------------------
66' Mustang
95' Lightning
65' Mustang
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RPM289
Journeyman Posts: 26
From: Phenix City, AL
Registered: Feb 2002
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posted 04-12-2002 09:53 PM
Thanks for all the information everyone! I can't wait to get the car out to the track. Hopefully I will in the next few weeks.Mike ------------------
66' Mustang
95' Lightning
65' Mustang
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