I'm new to the world of auto boxes as well as 300zx. Although i'm getting on fine with it I don't understand all the buttons that come with them. This is what I understand; can someone let me know if it's complete rubbish.

 

1st - when you need to stay in the lowest gear e.g. towing a caravan (or doing donuts!)

 

2nd - when you want to pull away gently e.g. in the wet/snow

 

Power button - gearbox kick's down more often.

 

Hold - hold in whatever gear you are in at the time e.g. going down a steep hill to increase engine braking.

 

Overdrive - no idea!

 

How's that?????

The 4 speed automatic transmission is a lockup type. When in drive mode, gears change 1-2-3 then 3 lockup, giving the effect of 4 gears. When overdrive (4th) is switched in, the change goes 1-2-3-4 then 4 lockup, giving the effect of 5 forward gears. There is a communications link between the automatic transmission control computer and the engine management computer, and this amongst other things, allows the engine computer to retard ignition, thus momentarily reducing engine power, during auto gear changes. Auto gear changes therefore are very smooth. The automatic transmission fitted to the turbo model is stronger than the one installed in the non turbo. Although the gear ratios are almost identical, there are many minor differences between the two transmissions.

 

The Japanese automatic transmission has many more features than the export models. A "power", "normal" and "hold" switch is fitted to modify transmission shift points. The effect of the "power" setting is to delay upshifting, but does not alter the maximum RPM that change occurs. In order to change at the red line or rev limiter speed, one must operate the shifter manually. The hold setting allows holding prevents downshift into second when the shifter is set to "D", and prevents downshift into first when the shifter is in "2". Another curious feature with the Japanese version is that lock up is also available in second gear.

The Japanese automatic transmission has many more features than the export models. A "power", "normal" and "hold" switch is fitted to modify transmission shift points. The effect of the "power" setting is to delay upshifting, but does not alter the maximum RPM that change occurs. In order to change at the red line or rev limiter speed, one must operate the shifter manually. The hold setting allows holding prevents downshift into second when the shifter is set to "D", and prevents downshift into first when the shifter is in "2". Another curious feature with the Japanese version is that lock up is also available in second gear.

 

now more confused than before.

because I can get the revs up to the red line without shifting manually...

now more confused than before.

because I can get the revs up to the red line without shifting manually...

 

not driven an auto zed, but loads of other cars... and they usually only redline if you hold the kick-down switch down (i.e. foot to the floor, then a bit extra). Maybe different on the z, if so I'll get me coat!!

 

Rich

if you have a chip (jwt eg) then i think they riase the rev limit as I can rev my uk car to the red (although dont bother much). The uk car as said above only has an overdrive button on the gear lever itself, whereas i think the JP box button is forward of the lever.