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Author Topic:   Gear ratio
Ken&Shell
Gearhead

Posts: 614
From: Mocksville, NC
Registered: May 2000

posted 06-25-2001 08:43 PM     Click Here to See the Profile for Ken&Shell   Click Here to Email Ken&Shell     Edit/Delete Message   Reply w/Quote
Ok, time for my next question. Currently I am running .411 in my car running 1/8th mile. We were thinkin of going up. Any suggestions of how big a leap to take.

Shell
Ladyracer

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Big Block Capri
Gearhead

Posts: 122
From: Essex, Ontario, Canada
Registered: Nov 2000

posted 06-25-2001 10:06 PM     Click Here to See the Profile for Big Block Capri   Click Here to Email Big Block Capri     Edit/Delete Message   Reply w/Quote
Hey Guys,
If you go to prestage.com and click on car math they have a gear ratio calculator where you plug in all your variables and it spits out the answer. This way you don't have to wait until someone asks for your peak rpm, tire diameter etc. It's quick and accurate. I had a formula around here but where it is now is anyones guess.

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Paul Garant
"No replacement for displacement."

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steve'66
Gearhead

Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000

posted 06-25-2001 10:20 PM     Click Here to See the Profile for steve'66   Click Here to Email steve'66     Edit/Delete Message   Reply w/Quote
Shell,

Yes, try the on-line calculator.
I think 4.11s are too tall for the 1/8 mile. We run that gear in the 1/4mi and are at 5800rpm through the traps in Mels 12 sec car, 110mph 26" tire. With your auto you also have to figure on some trans slip. She'd probably be around 6200rpm thru the traps with an auto. I'll guess you'll end up with 4.56 gears.

SteveW

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 06-26-2001 12:48 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
4.88's!

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 06-26-2001 12:49 AM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
Or.........4.71's if you have a 9 inch.

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Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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Dave_C
Gearhead

Posts: 666
From: Gadsden, Al
Registered: Aug 99

posted 06-26-2001 12:59 AM     Click Here to See the Profile for Dave_C   Click Here to Email Dave_C     Edit/Delete Message   Reply w/Quote
When my car (69 Mustang) was small tired I ran it with 4.56 gears when I was running 26" slicks. That was with a 4500 stall 10" converter. Was shifting at 6500, crossed at 6400.

Went to a 28" tire and changed to a 5.14 gear. Was using an 8" converter that stalled at 5400. With a little tighter converter it would bring the rpms down a little, but I shifted at 6800, crossed at 6700 in 3rd (C-6)in the 1/8

Later,

David Cole

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Ken&Shell
Gearhead

Posts: 614
From: Mocksville, NC
Registered: May 2000

posted 06-26-2001 10:57 AM     Click Here to See the Profile for Ken&Shell   Click Here to Email Ken&Shell     Edit/Delete Message   Reply w/Quote
quote:
Originally posted by Moneymaker:
Or.........4.71's if you have a 9 inch.


Yes Alex, we run a Moser 9" in the car. We also run 28-10.5-15 M/T slicks.

I only turn my car about 5500rpm. Running 7.35 at 94-95 mph

SHell


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Moneymaker
Administrator

Posts: 18704
From: Lyons, IL, USA
Registered: May 99

posted 06-26-2001 03:14 PM     Click Here to See the Profile for Moneymaker   Click Here to Email Moneymaker     Edit/Delete Message   Reply w/Quote
4.71's or 4.86's will be fine in 1/8th mile applications.

------------------
Alex Denysenko
Co-Administrator and Moderator
NHRA/IHRA/SRA member
NHRA and IHRA SS/LA National Record Holder '00 & '01
Fleet of FoMoCo products
Moneymaker Bio
US Class Nationals link

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