Why doesn't the new evo vii have a 6 speed tranny?
Originally posted by broeli
Umm..ok, how about the '03 Cobra, WS6 T/A's, Camaros, Corvettes, Vipers, etc. They aren't peaky 4-bangers
BUT they DO benifit having a 6-speed....correct? The first 4 gears are geared for optimum perforfarmance more than a 5-speed would be
Umm..ok, how about the '03 Cobra, WS6 T/A's, Camaros, Corvettes, Vipers, etc. They aren't peaky 4-bangers
BUT they DO benifit having a 6-speed....correct? The first 4 gears are geared for optimum perforfarmance more than a 5-speed would be
edit - Automobile mag, not R&T.
Last edited by WestSideBilly; Jun 12, 2002 at 06:25 PM.
Hey WestSideBilly! Maybe I should introduce myself as EastCoastBilly!
Some manufacturers when designing their 6 speeds gearboxes don't really think about how to best harmonize the torque band with the gearing to hit the sweet spot more often. I read somewhere about the Celica GTS (I think that's what it's called) having a small powerband yet widely spaced gearing down low? For example a shift from 1st (at the top of the powerband) to 2nd leaves you hundreds of RPM's below the start of the powerband... what's up with that? ???
In a perfect world inflexible engine designs aren't made. In the real world they are made and and should consequently command complementary gearing choices but sometimes this just doesn't happen. Now the GTS is quite exceptional in that the sweet spot is tiny (well within 1000RPM from some accounts) so we would be talking about really tight gearing and that's not always practical.
A while back when the Corvette ZR1 was first introduced, IIRC, I read somewhere that it had a 6th gear so low that it sits around 1700RPM when cruising at highway speeds... IMO that's solely for soaking up long expanses of asphalt while consuming as little petrol as possible... since that 5.7L engine lugging along at 3000RPM on the highway might lead to unacceptable fuel economy, noise levels and a lack of comfort. The ZR1's 5th is a long way off gearing wise and is the gear with which top speed is achieved.
Also all this talk about "overdrive" is misleading since the term originated from automatic transmission technology. Our MT's don't have that effective gear reducer so let's just say "really really tall gear" when referring to 6th ok?
Some manufacturers when designing their 6 speeds gearboxes don't really think about how to best harmonize the torque band with the gearing to hit the sweet spot more often. I read somewhere about the Celica GTS (I think that's what it's called) having a small powerband yet widely spaced gearing down low? For example a shift from 1st (at the top of the powerband) to 2nd leaves you hundreds of RPM's below the start of the powerband... what's up with that? ???
In a perfect world inflexible engine designs aren't made. In the real world they are made and and should consequently command complementary gearing choices but sometimes this just doesn't happen. Now the GTS is quite exceptional in that the sweet spot is tiny (well within 1000RPM from some accounts) so we would be talking about really tight gearing and that's not always practical.
A while back when the Corvette ZR1 was first introduced, IIRC, I read somewhere that it had a 6th gear so low that it sits around 1700RPM when cruising at highway speeds... IMO that's solely for soaking up long expanses of asphalt while consuming as little petrol as possible... since that 5.7L engine lugging along at 3000RPM on the highway might lead to unacceptable fuel economy, noise levels and a lack of comfort. The ZR1's 5th is a long way off gearing wise and is the gear with which top speed is achieved.
Also all this talk about "overdrive" is misleading since the term originated from automatic transmission technology. Our MT's don't have that effective gear reducer so let's just say "really really tall gear" when referring to 6th ok?
You're right, they're not overdrive gears in the true sense of the word. But "really really tall" doesn't have the same ring to it 
even if it is more accurate.
I found the issue of Automobile with the 2003 viper in it - top speed of 185 is in 5th, in 6th the car can manage "only" 170. It's the same as the ZR1 was (and the current vettes still are). I drove a slushbox vette and was going about 65, looked down, and I thought the tach was broke because it was on 900 RPM!
Guess I'm used to those darn 4-bangers
even if it is more accurate.I found the issue of Automobile with the 2003 viper in it - top speed of 185 is in 5th, in 6th the car can manage "only" 170. It's the same as the ZR1 was (and the current vettes still are). I drove a slushbox vette and was going about 65, looked down, and I thought the tach was broke because it was on 900 RPM!
Guess I'm used to those darn 4-bangers
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