04-21-2024, 02:36 PM | #1 |
Drives: 2021 LT1 convertible Join Date: Aug 2023
Location: North Carolina
Posts: 4
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A10 vs 6M gear ratios
I have a 2021 LT1 V8 with an A10 trans and was looking up more specs about the car. I noticed the gear ratio for the A10 is 2.77 and 3.73 for the 6M. Why is there a difference in gear ratios between the auto and manual transmission?
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04-21-2024, 02:57 PM | #2 |
Drives: 2024 Camaro 1SS M6 Join Date: Nov 2023
Location: Western NY
Posts: 170
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I would think it is because there are more gears to climb in the A10.
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04-21-2024, 03:20 PM | #3 | |
Drives: 6th Gen LT1 Join Date: Jun 2023
Location: Southeast
Posts: 251
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Quote:
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04-21-2024, 03:51 PM | #4 |
Drives: 2021 LT1 convertible Join Date: Aug 2023
Location: North Carolina
Posts: 4
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04-22-2024, 08:28 PM | #5 | |
Drives: 6th Gen LT1 Join Date: Jun 2023
Location: Southeast
Posts: 251
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Quote:
The main difference is dictated by how manual and autos work internally, design and etc... The A10 has planetary gears that are concentric and has 6 clutches, which engages 2 or 3 at the same time to produce this 10 different gear ratios. The manual transmission has the limitation of the H pattern you need to manually shift and it reduces or multiplies speed by transfering movement from primary to secondary shaft back to output shaft. Reducing speed too much with a high ratio, like 4.7 to 1 of the A10, means that one gear will be too big and the other too small. Small gears can't take much torque, and making everything larger will render the transmission too big and heavy. So the different ratios 2.77 and 3.73 are based on design constrains and physics that have more to do with transmission design than anything else. Rule of thumb and history tells us that that to launch a car you need a 10:1 final 1st gear in approx and reach Vmax in a 1:1 ratio @ rpm of max power. The A10 does this, and the M6 too with Vmax in 5th gear @ 0.74:1, not ideal but having less power losses than the auto makes for it. A10: 7th @6000 rpm = 181mph M6: 5th @6000 rpm = 179mph Sorry if the answer is overkill, but It is an interesting topic. |
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