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Author Topic:   1/4 RPM question.
RPM289
Journeyman

Posts: 26
From: Phenix City, AL
Registered: Feb 2002

posted 04-11-2002 10:16 PM     Click Here to See the Profile for RPM289   Click Here to Email RPM289     Edit/Delete Message   Reply w/Quote
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

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66' Mustang
95' Lightning
65' Mustang

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65_289
Gearhead

Posts: 421
From:
Registered: Jul 2001

posted 04-11-2002 10:21 PM     Click Here to See the Profile for 65_289   Click Here to Email 65_289     Edit/Delete Message   Reply w/Quote
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

posted 04-12-2002 06:51 AM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
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

posted 04-12-2002 05:09 PM     Click Here to See the Profile for n2oMike   Click Here to Email n2oMike     Edit/Delete Message   Reply w/Quote

http://www.mustangworks.com/analyzer.html

You 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

posted 04-12-2002 05:20 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
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

posted 04-12-2002 05:25 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
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

posted 04-12-2002 09:48 PM     Click Here to See the Profile for RPM289   Click Here to Email RPM289     Edit/Delete Message   Reply w/Quote
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

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66' Mustang
95' Lightning
65' Mustang

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RPM289
Journeyman

Posts: 26
From: Phenix City, AL
Registered: Feb 2002

posted 04-12-2002 09:53 PM     Click Here to See the Profile for RPM289   Click Here to Email RPM289     Edit/Delete Message   Reply w/Quote
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

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66' Mustang
95' Lightning
65' Mustang

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