Quote:
Originally Posted by DaRockwilder
Sorry, I forgot to mention I've got an Ecotec. Since Its a 4-banger it got a better gear ratio.
I wonder if both ratios can handle the same amount of torque? I would think it would be a good upgrade to go to the Ecotec trans if thats the case.
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Also could be that your Ecotec has the 4T40E and not the 4T45E like you mentioned. The 3400 has the 45E.
The difference between the auto and manual isn't just the final drive ratio, the clutch and torque converter work differenty at transfering engine torque to the transmission. When the clutch is engaged, it's directly connected to the crankshaft (via the flywheel) and therefore doesn't waste any energy from the engine sending torque from the crank to the transmission. The torque converter has turbines (or vanes) inside of it that fluid gets forced through to turn. Instead of being directly connected, there's that layer of fluid going from one turbine to another which transfers torque from the crank to the transmission. Since this takes a small amount of extra energy, the manual will put out a slightly higher wheel horsepower number than an automatic. But like what was said before, putting two identical cars against each other with the only thing different being the transmissions, unless the person driving the manual was almost perfect at launching and shifting his car, it would be a very close race.