Whats OD?
11 Second Club
Joined: Feb 2008
Posts: 317
Likes: 2
From: TN
Last edited by poorhousenext; Feb 24, 2011 at 09:49 AM.
Assuming you're asking about automatics,our 4L60Es' have 4 gear ratios,
not including torque convertor 'slippage/stall/efficiency
-1st,3.06:1 ratio-engine turns 3.06 times to provide 1 output turn to the driveshaft
-2nd,1.62:1 ratio-engine turns 1.62 times to provide 1 output turn to the driveshaft
-3rd (D),1:1 ratio-every engine rotation results in 1 driveshaft rotation
-4th (OD), .70:1 ratio,engine has to spin only 7/10 of a rotation to produce 1 driveshaft rotation
also torque convertor lockup occurs when torque demand is low enough(computor controlled) to provide a 1:1 ratio thru the convertor.
not including torque convertor 'slippage/stall/efficiency
-1st,3.06:1 ratio-engine turns 3.06 times to provide 1 output turn to the driveshaft
-2nd,1.62:1 ratio-engine turns 1.62 times to provide 1 output turn to the driveshaft
-3rd (D),1:1 ratio-every engine rotation results in 1 driveshaft rotation
-4th (OD), .70:1 ratio,engine has to spin only 7/10 of a rotation to produce 1 driveshaft rotation
also torque convertor lockup occurs when torque demand is low enough(computor controlled) to provide a 1:1 ratio thru the convertor.
Thread Starter
On The Tree
Joined: Feb 2011
Posts: 128
Likes: 0
From: NJ
ahh i see i thought drive gave all 4 gears while OD did something more lol
im new to automatics, this is my first auto Z28
If highway racing starting at a 40mph roll, would it be better to keep the car in Drive or Over Drive?
im new to automatics, this is my first auto Z28
If highway racing starting at a 40mph roll, would it be better to keep the car in Drive or Over Drive?
Drive (D) limits you to 1st,2nd, & 3rd (D).
Overdrive (OD) gives you access to all 4 gears.
Torque convertor 'lock-up' can occur in either D or OD when low torque demand occurs.
Overdrive (OD) gives you access to all 4 gears.
Torque convertor 'lock-up' can occur in either D or OD when low torque demand occurs.
BUT to answer your question, I always leave it on O/D incase the race does not stop at 1/4 mile. I have had some highway races where no one wanted to give it up. You do not want to manual shift @ 5k+ rpms.
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