Quote:
Originally Posted by Captain Insano
Hmmm, well I have not heard definitively from any of the shops that have autos if they are seeing that (shops like P&L Mortorsports, FA20club.com, etc that actually have autos for shop cars) 10whp loss you claim. Let's just say I'm very skeptical, but open minded...
Also, Sport-Tech is right, the gearing is more noticeable in higher gears, but in the lower gears, not as much. The lower gears are the gears you will use on a track 99% of the time and the gears that matter for performance. I think the 5-60 (no launch) motortrend test between the two is telling, only one tenth of a second difference in acceleration with no launch required. But yes, I did say 2-6 would be nearly identical and I should have said "2-4 will be very similar".
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Given that you are losing maybe 2/10ths per shift by shifting manually vs the auto, the 1/10th slower time for the auto on the 5-60 means the auto's "real" time for the run is slower by about 1/2 second (assuming 2 gear shifts to 60) - that seems in line with the 10whp loss figure claimed.
Torque trough lies between 3-4.4K (see below):
To correct my earlier comment, you actually never really get into the torque trough with either tranny on a redline upshift except for the 1-2 shift on the auto, but you do always lose more power on upshifts with the auto (see relative speed vs rpms for the auto vs the manual below). And you get closer to the torque trough on the 2-3 auto upshift (at 4900 rpm) than on the higher-speed 3-4 or 4-5 shifts (5200 rpm for both). The manual drops down to only 5800 on the 3-4 upshift - less loss of power. It's also 300 rpm better on the 2-3 upshift, and 900 rpm better on the 4-5 upshift.
