ZR-1 Net Registry Forums - View Single Post - A question about speed reading at 5th gear

gorgeousgeorge · 11-08-2010

Thank you for your interesting replies!

I understand that 140 mph at 7000rpm in 5th gear is NOT normal for ZR-1. The problem would be that the rear end ratio is not normal or the tachometer is not correct. I think I have to inspect the rear end ratio at first.

Does the method below work well to inspect the ratio?
1. lift the car up.
2. mark a dot with chalk on circumference of the propeller shaft.
3. mark a dot with chalk on the rear tire wall.
4. rotate rear tire and drive the propeller shaft.
5. count the number of rotation of the tire required to have the propeller shaft make one complete rotation.

I am not a gearheaded guy

and do not want to make any mistakes so I ask for the right procedure.

Thank you!

Yoshi Honda
1991 ZR-1

11-08-2010	#5
gorgeousgeorge Join Date: Nov 2010 Location: Japan Posts: 30	The right procedure for inspect the ratio of rear end Thank you for your interesting replies! I understand that 140 mph at 7000rpm in 5th gear is NOT normal for ZR-1. The problem would be that the rear end ratio is not normal or the tachometer is not correct. I think I have to inspect the rear end ratio at first. Does the method below work well to inspect the ratio? 1. lift the car up. 2. mark a dot with chalk on circumference of the propeller shaft. 3. mark a dot with chalk on the rear tire wall. 4. rotate rear tire and drive the propeller shaft. 5. count the number of rotation of the tire required to have the propeller shaft make one complete rotation. I am not a gearheaded guy and do not want to make any mistakes so I ask for the right procedure. Thank you! Yoshi Honda 1991 ZR-1