OD
 

...is an actual Gear C-888

The Torque Converter Clutch lockup is a phantom gear. It's pure fluid driven.

Re: OD
 

Then why is it that when I turn OD off my car pulls harder in every gear??? and uses engine braking when I let go off the gas???

This voo doo thing is weird

lol
 

hard to explain to you in text format...

The OD on/off exists for possible driving situations. Mainly towing. If you are towing, you will need to have firmer shifts (to reduce SLIPPAGE (which creates heat) in the tranny), engine braking (so as to reduce the possibility of the brakes overheating) and will keep your RPM's higher as you will not be using OD which IS fourth gear.

The possibility also exists that while you switch OD off, your engine timing changes to where you have a different power band. Your engines computer may trade ecomomy for low RPM TORQUE in this sense so you are more prepared to tow a load behind you.

I'm just being general but I would suggest for a more explicit answer to email Nissan. They were very very knowledgable at this years Detroit auto show, you should have PM'd me to ask them for you then!

I went for a Drive here is
 

I went for a Drive here is some comparison

OD on OD off
feels like slipping Feels like tranny connected to engine
wants to coast doesn't want to coast
less power more power
wastes less gas 2000rpm wastes more gas 2000rpm
bad for racing very good for racing up to 80

very good! Your butt dyno
 

very good! Your butt dyno is working!

I went for a Drive here is
 

I went for a Drive here is some comparison

OD on
feels like slipping
wants to coast
less power
wastes less gas 2000rpm
bad for racing

OD off
Feels like tranny connected to engine
doesn't want to coast
more power
wastes more fuel 2000rpm
very good for racing up to 80mph

Re: very good! Your butt dyno
 

It's not really butt dyno, I got track slips to prove it.

OD on and leaving in D=17.3

OD off and manually shifting=16.9

also if you mess with the pressure sensor you can have it off during wot and it will cut off another .1-.2 off your 1/4 mile time.

Re: lol
 

You know, I mis-spoke and forgot about this. My folks had an old Nissan Pathfinder with an indepedent button for "power" and "economy" in addition to the O/D on-off. Power-mode would rev the tach higher between shifts, shift harder, and was automatically engaged with a switch in the floor, under the gas pedal, for WOT "emergencies". (we all hated to drive that vehicle, ugh).

Many cars have a "normal" and "power" transmission selection mode so the car will behave in a performance manner under the power-mode. Nissan may have rolled all of this into the O/D off switch. Not only would you stay out of top gear, the transmission might shift with performance in mind. Much of my experience was limited to Fords, which, for the most part, had a fancy way to shift the column down to "3", with the press of a button.

The next time I rent a Nissan, I'll have to mess with the O/D switch (which may be tomorrow).

RH77