Calculations Error
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From: Cleveland, Ohio
Car: 1992 Firebird
Engine: 3.1L V6
Transmission: 5 Speed Manual
Axle/Gears: 3.42 Peg Leg
Calculations Error
I am referring to this:
https://www.thirdgen.org/calculations
I was trying to calculate my speed, basically to double check my speedo. It says Tire Radius, RPM, Rear End Gear, and Transmission Gear. So I enter:
Tire Radius: 8.75
RPM: 2300
Rear End Gear: 3.42
Transmission Gear: 1 (4th is direct in the T5, right?)
and get like 36 MPH. Basically, I was going 70, so something wasn't right. Just out of curiosity, I enter in my Tire Diameter, and get 70, so I think that Radius should read Diameter. Please correct me if I'm wrong.
https://www.thirdgen.org/calculations
I was trying to calculate my speed, basically to double check my speedo. It says Tire Radius, RPM, Rear End Gear, and Transmission Gear. So I enter:
Tire Radius: 8.75
RPM: 2300
Rear End Gear: 3.42
Transmission Gear: 1 (4th is direct in the T5, right?)
and get like 36 MPH. Basically, I was going 70, so something wasn't right. Just out of curiosity, I enter in my Tire Diameter, and get 70, so I think that Radius should read Diameter. Please correct me if I'm wrong.
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From: Usa
Car: 85 IROC-Z
Engine: magflatoVE
Transmission: T56
Axle/Gears: 9" 411
did you measure wheel+tire radius or just the wheel? because my wheel radius (center of the wheel to the ground) is about 13"
Last edited by 400Z28Racer; Nov 22, 2006 at 05:15 PM. Reason: I won
Thread Starter
Supreme Member
iTrader: (4)
Joined: Apr 2005
Posts: 1,124
Likes: 0
From: Cleveland, Ohio
Car: 1992 Firebird
Engine: 3.1L V6
Transmission: 5 Speed Manual
Axle/Gears: 3.42 Peg Leg
I guess I figured that with rim and tire (15" rims) it was 17.5, but that might be a bit to little, now that I look at it. Ill recalculate when I break out the tape measure.
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