Why so high final drive ratio?
Senior Member
Joined: 07-15-2009
Posts: 2,070
From: Waterbury CT
Yup, the GMTU brings that back up to 290hp, 315 lb/tq. though IIRC.
Here the link to the thread on that here: https://www.chevyhhr.net/forums/2-0l-performance-tech-46/gm-performance-parts-turbo-upgrade-kit-19891/
Later
Allex
Here the link to the thread on that here: https://www.chevyhhr.net/forums/2-0l-performance-tech-46/gm-performance-parts-turbo-upgrade-kit-19891/
Later
Allex
Last edited by asanti; May 12, 2011 at 12:27 PM. Reason: corected GMTU hp/tq #'s and added linky.
Senior Member
Joined: 07-17-2006
Posts: 6,053
From: Dallas, GA
I won't mention names, but some of you have your head way up, where the sun don't shine.
A SS 5sp manual vs a SS Auto, same HP, the auto will put the powder down, and consistantly better than a shifted SS. Shifting manually, I don't care how good you think you are, you will not and can not be consistant. A Auto takes almost all of the driver error[read "Rookie"] out of the equation. Unless they have raced for many years, and behind the same car, you will not shift at the right time, every time. Bottom line, 5 sp eats it-goes home.
Given the ratios stated for both the SS manual and the Auto, the Auto has a slight edge on the top end, no matter what you think. "Moon"
A SS 5sp manual vs a SS Auto, same HP, the auto will put the powder down, and consistantly better than a shifted SS. Shifting manually, I don't care how good you think you are, you will not and can not be consistant. A Auto takes almost all of the driver error[read "Rookie"] out of the equation. Unless they have raced for many years, and behind the same car, you will not shift at the right time, every time. Bottom line, 5 sp eats it-goes home.
Given the ratios stated for both the SS manual and the Auto, the Auto has a slight edge on the top end, no matter what you think. "Moon"
But since this did get brought back to life, when did the auto's final drive ratio change from 3.91 to 3.29 on the LS/LT's? I know a few (sleeper) has the 3.91 in his though.
yes my 08 has option FX2 = 3:91
Senior Member
Joined: 07-19-2008
Posts: 183
From: Somewhere
Still think the OP has an interesting question.. regardless of what is faster, more mpg, etc, why do you have run at 2500 RPM at 65 in a 5sp versus approx 2100 in an auto? I know it would be nice if I could have an extra gear to go into when I'm at speed on the interstate - and I'm not talking 80 either, although it's only 5 over in area's I might drive.
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