With an 11.90 car you probably would not see a change. 11.90 and slower with a 6.1 gear ratio is the exception to this video, meaning it probably would not get into the overdrive portion of the sheave because it’s low on rpm at the finish line. Switching to. 6” sheave would give you the ability to go up on your gear ratio to a 6.5 or even a 7.0. Look at your tach to see if it’s getting 1 to 1 and also look at the overdrive percentage!
If I use a 6 inch sheave on the primary, doesn't the secondary also need a 6" sheave? Otherwise the belt would be too loose or too tight at high speed to reach the outer edge. Or have I thought incorrectly about that?
@@scotty6334 usually the secondary sheaves are 7”. If you have a 6” secondary then it would be considered an under drive. Even though it’s a 6” the primary will still use the entire sheave.
Thank you as always for sharing
Nice hat!
If I have a 11.9 car with 5 inch sheave and a 6.1 gear ratio and I change to a 6 inch sheave what would happen?
With an 11.90 car you probably would not see a change. 11.90 and slower with a 6.1 gear ratio is the exception to this video, meaning it probably would not get into the overdrive portion of the sheave because it’s low on rpm at the finish line. Switching to. 6” sheave would give you the ability to go up on your gear ratio to a 6.5 or even a 7.0. Look at your tach to see if it’s getting 1 to 1 and also look at the overdrive percentage!
Just had a look a data on the tach it’s saying over 1.1 @ 6246 +3.86s
Overdrive is 140.83% @ 9.02s
Max rpm is 7200 that is a 12.00 pass
If I use a 6 inch sheave on the primary, doesn't the secondary also need a 6" sheave? Otherwise the belt would be too loose or too tight at high speed to reach the outer edge. Or have I thought incorrectly about that?
@@scotty6334 usually the secondary sheaves are 7”. If you have a 6” secondary then it would be considered an under drive. Even though it’s a 6” the primary will still use the entire sheave.