C4 4+3 Transmission...how does it work?
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Pro
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From: Oakland CA
C4 4+3 Transmission...how does it work?
I always wondered how it worked. Do you drive it like a regular manual?
Does it automatically shift into the overdrive gear?
How does it do that? Or decide when to? Thanks.
Does it automatically shift into the overdrive gear?
How does it do that? Or decide when to? Thanks.
Thread Starter
Pro
Joined: Sep 2001
Posts: 584
Likes: 0
From: Oakland CA
Re: C4 4+3 Transmission...how does it work? (Ilovetorque)
I just read another thread that said it wanst particularly useful becuase the OD
ratio of one gear was essentially the same as the other. Does it always go into OD when you
drive? So if it does that, you can just go from say...2nd to fourth and be done with all your
shifting? Sounds cool to me...
ratio of one gear was essentially the same as the other. Does it always go into OD when you
drive? So if it does that, you can just go from say...2nd to fourth and be done with all your
shifting? Sounds cool to me...
Team Owner
Joined: Mar 2000
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From: Boston, MA
Re: C4 4+3 Transmission...how does it work? (Ilovetorque)
You have 7 gears with the 4+3. Here are the gear ratios for a car with the Z51 MK2 overdrive unit in it.
1st:....... 2.88
2nd:....... 1.91
2nd/OD:....... 1.30
3rd:....... 1.34
3rd/OD:....... 0.90
4th:....... 1.00
4th/OD:....... 0.68
As you can see, the OD gears are very close to the next numerically higher gear. The car's computer program will always shift into an OD gear if the required conditions are met. You can turn the program off and have complete control over it yourself though.
You do drive it just like a manual transmission, because it is one. It has a clutch pedal and everything. ;) I love mine, and it has been super reliable. The OD has one really cool feature. If you are cruising along in one of the OD gears, and stomp on the gas, the car will shift out of the OD gear automatically back into the straight gear and accelerate hard. :D Kind of like an automatic.
1st:....... 2.88
2nd:....... 1.91
2nd/OD:....... 1.30
3rd:....... 1.34
3rd/OD:....... 0.90
4th:....... 1.00
4th/OD:....... 0.68
As you can see, the OD gears are very close to the next numerically higher gear. The car's computer program will always shift into an OD gear if the required conditions are met. You can turn the program off and have complete control over it yourself though.
You do drive it just like a manual transmission, because it is one. It has a clutch pedal and everything. ;) I love mine, and it has been super reliable. The OD has one really cool feature. If you are cruising along in one of the OD gears, and stomp on the gas, the car will shift out of the OD gear automatically back into the straight gear and accelerate hard. :D Kind of like an automatic.
