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Author
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Topic: Gear ratio
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Ken&Shell
Gearhead Posts: 614
From: Mocksville, NC
Registered: May 2000
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posted 06-25-2001 08:43 PM
   
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
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posted 06-25-2001 10:06 PM
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.------------------
Paul Garant
"No replacement for displacement."
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steve'66
Gearhead Posts: 5659
From: Sonoma,CA,USA
Registered: Mar 2000
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posted 06-25-2001 10:20 PM
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
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posted 06-26-2001 12:48 AM
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
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posted 06-26-2001 12:49 AM
Or.........4.71's if you have a 9 inch.  ------------------
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
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posted 06-26-2001 12:59 AM
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
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posted 06-26-2001 10:57 AM
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
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posted 06-26-2001 03:14 PM
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
IP: Logged |
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