when the car is being driven up and down moutain roads, the switching in and out of overdrive can really wear on the clutchpacks/bands due to itll go to engage OD, and as its engaging, the computer will see you need to be in third, so itll re engage third.

see the constant slippage going on? thats BAD lol. kinda like slipping the clutch constantly why driving.

make sense?

The car doesn't bog, it just goes.  I tried reving it up a bit, but the brakes wouldn't hold and the wheels would start spinning.  So I just sit there until its time to go, and I just stomp on it.

And your first post just flat out confused me...

I know your car has more power than mine Heidi but what i do is leave OD on and in D1/1st i rev to 3000 RPMS and when its time to go I stomp and let off the brake and it seems to work good for me. Just some info dont know if it will help

Do a run with each?

The whole question was kinda stupid... I just remember people saying it made you faster... but that doesn't make sense once I think about it... I really doubt it'd make the car hit redline any faster... and since it's shifting at redline with overdrive on, might as well just do it.

Hahaha, too much thought into a 16 second car... haha.

3 NOV 2006
37˚F
54% humidity
30.46 Barometric
4.6 mph  N wind
Clear

06 Sentra SE-R  (O/D on)                        95 Eclipse GST

     1.0503              -Reaction-           1.0830
     2.4079                  60 ft.                  2.8348
     6.8239               330 ft.                7.3148
    10.5284                 1/8 ET                10.6515
      66.25                 1/8 MPH              74.79
    16.5477                 1/4 ET                15.8267
     80.75                  1/4 MPH              94.56
                                Finish margin             .6883
                       Winner

06 Sentra SE-R (O/D OFF)                70’s Mustang
      1.0486                    -Reaction-          .7807
     2.4743                 60 ft.                  2.1487
     6.7935                 330 ft.                 5.9587
    10.3550                1/8 ET                 9.0760
     69.18                  1/8 MPH             78.48
   16.1140                 1/4 ET                14.1105
     84.73                    1/4 mph              97.02
                             finish margin           2.2714
                     Winner

Last edited by Nperez1986 (2008-10-01 23:20:21)

Spec-V WannaBe wrote:

Also try doing the 'manual' automatic shifter. Put it in 1, then 2 then D. I know my car is faster with it like that.

i know your wrong.

electronics are a hell of a lot faster than you can shift.

cute02spec wrote:

Well... I did two runs with the overdrive on, one with it off.  With it off my 60' was worse, time was worse... trap speed was a smidge higher.

I declare this BUSTED.

I dunno...my 15.3 was with the O/D off...I could only get 15.5 with it on...

interesting...

My car seemed the same, but I ran .2sec quicker...my trap was even the same mph, maybe it was a fluke

cute02spec wrote:

My car seemed sluggish with it off... didn't even sound the same

i dont wanna sound arguementative, cuz you said below the quoted line that it was busted (+1 for mythbusters reference) but it really shouldnt matter if you shut the O/D off or have it on at the track. overdrive  is the highest gear the auto tranny can go into which puts the engine speed and wheel speed at 1:1 or close to it for fuel economy. next time your out cruising at a constant speed on the highway shut it off and feel and watch the tach, itll be like down shifting from 5th to 4th with a 5speed stick. it should work when cruising say 40mph to if conditions are right and theres not much load on the engine, youll feel a less prodominant shift cuz your going slower but youll feel it and see it with the tach. O/D shutoff shouldnt effect shift speed or when the tranny shifts at all under acceleration. its not like a "sport mode" button or "power" button that drags the gears out longer. its basically a gear lockout button  my .02

ohh i see, i had never heard that so i didnt realize thats whay you were testing it. kk i get it. end thread dont wanna be beating that horse

Um...wierd for you, I've always ran faster with O/D off. ???

then how would get 2 mph in the speed traps with OD off?...I found another auto SE-R here , so I'll make her run to see. What was your speed trap Heidi? So I can figure what part of 3rd gear you were in. That can help my research

And its not that maybe, somehow the computer also allows the individual gears to run longer with the O/D button off?   Possible?

Like you said, a number of things can affect times you mean Just Like a number of things can affect the way the ECU and, further then any spec, affect the TCM?

With overdrive on, my car shifted at redline.  With overdrive off, it shifted at redline... the exact same redline. 



If I have time, I can ghetto install a ZT2 to datalog this if it's such an important matter...

My trap speed was 85.69mph to the person that asked.

Nperez1986 wrote:

Well the redline is not the important part, I think the OD helps you REV faster...like an underdrive pulley for the tranny in a way...think about it...

Makes no sense....

Overdrive isn't a device (though it did used to be). Overdrive IS fourth gear. It's called overdrive because the output is faster than the input.

OD off = transmission will not shift into 4th gear. That's all it is, barring any additional info.

armadnigeneral wrote:

Nperez1986 wrote:

Well the redline is not the important part, I think the OD helps you REV faster...like an underdrive pulley for the tranny in a way...think about it...

Makes no sense....

Overdrive isn't a device (though it did used to be). Overdrive IS fourth gear. It's called overdrive because the output is faster than the input.

OD off = transmission will not shift into 4th gear. That's all it is, barring any additional info.

thats what i said earlier, its basically a gear lockout for the highest gear whether it be fourth or fifth, not sure how many an auto SE-R has. and i thought we put this one to bed awhile ago..