Quaife 6 Speed Gearkit, Feedback Anyone?
Senior Member
Joined: 11-27-2007
Posts: 1,115
From: Austin, Texas
OK, maybe not. I was surfing my way to their site again to send them another query on the subject when I found the following on cobaltss.net...
5-Speed FGP F35 Transmission using Quaife's 6-Speed conversion:
Type: Transverse front wheel drive, five-speed manual transaxle ( Optional with limited slip differential )
Engine range: 2.0L I-4 supercharged
Maximum engine torque: 200 lb-ft ( 271 Nm)
Maximum gearbox torque: 258 lb-ft ( 350 Nm )
Wheel+Tire Circumference: 2044mm
Gear ratios: MU3
First: 2.72
Second: 1.89
Third: 1.368
Fourth: 1.045
Fifth: 0.833
Sixth: 0.704
Reverse: 3.17
Final Drive Ratio: 4.04
So... never mind
5-Speed FGP F35 Transmission using Quaife's 6-Speed conversion:
Type: Transverse front wheel drive, five-speed manual transaxle ( Optional with limited slip differential )
Engine range: 2.0L I-4 supercharged
Maximum engine torque: 200 lb-ft ( 271 Nm)
Maximum gearbox torque: 258 lb-ft ( 350 Nm )
Wheel+Tire Circumference: 2044mm
Gear ratios: MU3
First: 2.72
Second: 1.89
Third: 1.368
Fourth: 1.045
Fifth: 0.833
Sixth: 0.704
Reverse: 3.17
Final Drive Ratio: 4.04
So... never mind
Senior Member
Joined: 11-27-2007
Posts: 1,115
From: Austin, Texas
Tough to say, third gear tops out before the end of the 1/4, so would times be faster with closer ratios and the same number of shifts? A lot of experiments with 3 gears to 7 with 4-stroke MX bikes and also cars, seems like in general 6 speeds has been where most perf vehicles end up turbo or otherwise.
Senior Member
Joined: 07-23-2008
Posts: 1,148
From: Peoria, AZ
Tough to say, third gear tops out before the end of the 1/4, so would times be faster with closer ratios and the same number of shifts? A lot of experiments with 3 gears to 7 with 4-stroke MX bikes and also cars, seems like in general 6 speeds has been where most perf vehicles end up turbo or otherwise.
Thats why we can up the rev limit 200 to 400 rpms more and still be in 3rd going through the traps.
Member
Joined: 05-07-2008
Posts: 49
From: Arkansas
No, I think you've got that wrong. Seems to me that if you wanted maximum acceleration capability, especially with the broad, flat torque curve of our motors, then this gear kit would certainly be the way to go. With the same torque, but better gearing, you will pull harder, and acclerate faster. And yes, the Quaife kit is undoubtedly stronger.
Where have people been breaking their cases?
Where have people been breaking their cases?
Senior Member
Joined: 03-31-2008
Posts: 772
From: CLEVELAND
Senior Member
Joined: 05-05-2008
Posts: 128
From: tampa
its possible to do but very exspensive...you would have to change the final drive ratio too or your gears would be extremly short. Now the only reason this would be of use is gas mileage ,it would drop your rpm lower at higher speeds... not really help your performance at all except add a extra gear change which would probaly slow you down.
When these cars were being tested the engineer form gm said that the cars were slower with a 6 speed so this a expsensive mod with very little gain. I can find the ;inl on the cobalt forums if needed.
When these cars were being tested the engineer form gm said that the cars were slower with a 6 speed so this a expsensive mod with very little gain. I can find the ;inl on the cobalt forums if needed.
Senior Member
Joined: 08-28-2008
Posts: 542
From: Houston, Texas
Tough to say, third gear tops out before the end of the 1/4, so would times be faster with closer ratios and the same number of shifts? A lot of experiments with 3 gears to 7 with 4-stroke MX bikes and also cars, seems like in general 6 speeds has been where most perf vehicles end up turbo or otherwise.
With that said, I'd like to revise my statement.
It's a worthless mod for show cars IF YOU REMAIN ON STOCK TURBO.
If you were running a big, laggy turbo, say a GT35 (journal bearing), I could see the benefit.
Senior Member
Joined: 11-27-2007
Posts: 1,115
From: Austin, Texas
I have the HPTuners and the Hahn/PPC tune, but I was talked out of raising the rpm limit in 3rd gear by someone with more experience than me with these drivelines due to possible durability considerations with 3rd gear and high rpm/horsepower. If I was actually competing for best 1/4 mile time I would definitely do it though as that last shift definitely costs time (although I don't think 400 rpm would be enough to avoid the shift). As far as the 6 speed, the cost/possible_benefit is not there for me or most folks.
