Author Topic: Overdrive (Read 9012 times)

90corsair · « **on:** Feb 3, 2006, 01:39PM »

g day guys . i want to know when should i use my over drive. i never use it. should i.

cheers for any help.

Budgie · « **Reply #1 on:** Feb 3, 2006, 01:44PM »

Anything over 50kmph... yeah, you should use it.

ashman01 · « **Reply #2 on:** Feb 3, 2006, 01:44PM »

overdrive basicly uses all 4 gears to accelerate instead of 3. Basicly without it on it will use 3 gears to get up to your desired speed and it will coast in 4th to save petrol and then change down when you want to accelerate some more.

But with it on it will stay in whateva gear is closest to what speed you are doing. Mainly you only need it for going up big long hills that require you to say in 1st or second the whole way up the hill instead of changing when you put your foot down on the accelerator.

Sorry if what i have said is abit hard to follow. In short....Get a manual.

Dano Da Bomb · « **Reply #3 on:** Feb 3, 2006, 01:45PM »

I tend to use it when im towing it just gives the engine a bit more power.

Dano Da Bomb · « **Reply #4 on:** Feb 3, 2006, 01:46PM »

Well not really power..... you know what i mean

Budgie · « **Reply #5 on:** Feb 3, 2006, 01:48PM »

What ashman? What you just said doesn't make sense to me...

4th in U12 auto boxes has a lock-up torque convertor that kicks in at 70kmph (as I remember from my corsair) in the FWD's and my car's auto locks up at 80kmph.

If overdrive is OFF the car will not go any higher than 3rd gear. IE: With it off, you will be revving at 3500rpm or something stupid at 100kmph. With it on, it will drop into 4th and over 70kmph the torque convertor will lock up.

90corsair · « **Reply #6 on:** Feb 3, 2006, 01:52PM »

another thing when the light is on does that mean yhe over drive is on or off. cheers

Jecks · « **Reply #7 on:** Feb 3, 2006, 01:54PM »

pretty much, overdrive lower's the gear your currently at by 1... when your at a stand still with overdrive off, you will draw out your first gear longer... its usefull if someone suddently brakes and you need to lower a gear, simply push the button and it knocks down (as if you were gear braking in a manual)... also use it if you are towing something and need more power...

note: O/D should always be on, unless you switch it off in which case an 'O/D off' light will light up on your dashboard

Budgie · « **Reply #8 on:** Feb 3, 2006, 01:54PM »

Quote from: 90corsair on Feb 3, 2006, 01:52PM

another thing when the light is on does that mean yhe over drive is on or off. cheers

Look at the button on the shifter...

90corsair · « **Reply #9 on:** Feb 3, 2006, 01:58PM »

so if the light on the dash is off does that mean the over drive is on. or is it the other way round. cheers

Budgie · « **Reply #10 on:** Feb 3, 2006, 02:04PM »

My dash says O/D Off ... that is what lights up. I'm sure the FWD's are the same. So its pretty bloody obvious.

Chadza · « **Reply #11 on:** Feb 3, 2006, 02:14PM »

Also if you wondering....the key to start your car goes into the little key slot to the right of the steering wheel.

Jtas · « **Reply #12 on:** Feb 3, 2006, 03:16PM »

Quote from: ChadzaTRX on Feb 3, 2006, 02:14PM

Also if you wondering....the key to start your car goes into the little key slot to the right of the steering wheel.

no you full, that makes no cents...
the little slot is a coin slot, it accepts all but 5cent coins, the key that came with your cars is just to unlock the doors/boot/glovebox.

Out of curiosity, what is everyones average cents per kilometres?

I usually have to put $2 in the slot to get from my place to town, my car is a ripoff, youd think you'd get free fuel for the $2 but you dont!!!!

proact · « **Reply #13 on:** Feb 3, 2006, 03:22PM »

i cruise at 110 down to phillisland in 5th gear at 2.5 thou rpm which i think is pritty good.
if your travelling at 100 at 3.5 thou rpm thats not good ratio.
Unless auto's are shit!!!

Kranzy · « **Reply #14 on:** Feb 3, 2006, 04:33PM »

Autos only have four gears.

90corsair · « **Reply #15 on:** Feb 4, 2006, 08:24AM »

so if the light is on the over drive is off. this is confusing cause usually if somthing is on the light will show. not if somthing is off. sorry if u dont under stand what im trying to say cause i want a strong understanding of the over drive in the u12.

Rake · « **Reply #16 on:** Feb 4, 2006, 10:12AM »

Quote from: 90corsair on Feb 4, 2006, 08:24AM

so if the light is on the over drive is off.

yes.

Pintara Auto Drive Ratios

1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.694 <-- O/D

With overdrive OFF the light (as said) will come on to annoy you, and the box will not go past 3rd gear.

It's called overdrive as the gear ratio for 4th gear is below 1. All of the others are above 1. These low gears are what amplify torque/power that gets to the wheels (Launching in high gears = sluggy or doesn't work at all) - however the engine will rev out quickly at lower speed, hence the need to change gears. Any overdrive gear (4th in our autos and 5th in our manuals) will have crap acceleration but allow the engine to tick over at low rpm whilst at high speed - if you were still in say 2nd or 3rd you'd be redlining the thing.

Well, thats common sense really. Having overdrive on will allow the car to gear into 4th when cruising at speed, for better fuel economy, and presumably less engine thrashing and noise. if it's a problem, say you encounter a really steep hill or towing, you can turn OD off to force the box to not exceed 3rd gear. Much like putting it in 2 makes it not exceed 2nd gear, or putting it in 1 makes it not exceed 1st gear.

Go for a drive, get up to 100km/h somewhere, and switch between OD on and off if you want to experience it for yourself. I havn't done more than 2 hours driving total ever in an auto and I know all of this, it is not complex.

Short answer: OD on = 4 useable gears. OD off = 3 useable gears.

Gangstanza · « **Reply #17 on:** Feb 4, 2006, 10:34AM »

ROFL AT THIS THREAD.

Seriously you can FEEL the difference if O/D is on or off, it's not rocket science.

ashman01 · « **Reply #18 on:** Feb 20, 2006, 09:24PM »

Quote from: Rake on Feb 4, 2006, 10:12AM

yes.

Pintara Auto Drive Ratios

1st - 2.785
2nd - 1.545
3rd - 1.000
4th - 0.694 <-- O/D

With overdrive OFF the light (as said) will come on to annoy you, and the box will not go past 3rd gear.

It's called overdrive as the gear ratio for 4th gear is below 1. All of the others are above 1. These low gears are what amplify torque/power that gets to the wheels (Launching in high gears = sluggy or doesn't work at all) - however the engine will rev out quickly at lower speed, hence the need to change gears. Any overdrive gear (4th in our autos and 5th in our manuals) will have crap acceleration but allow the engine to tick over at low rpm whilst at high speed - if you were still in say 2nd or 3rd you'd be redlining the thing.

Well, thats common sense really. Having overdrive on will allow the car to gear into 4th when cruising at speed, for better fuel economy, and presumably less engine thrashing and noise. if it's a problem, say you encounter a really steep hill or towing, you can turn OD off to force the box to not exceed 3rd gear. Much like putting it in 2 makes it not exceed 2nd gear, or putting it in 1 makes it not exceed 1st gear.

Go for a drive, get up to 100km/h somewhere, and switch between OD on and off if you want to experience it for yourself. I havn't done more than 2 hours driving total ever in an auto and I know all of this, it is not complex.

Short answer: OD on = 4 useable gears. OD off = 3 useable gears.

Thats what i was trying to say sept i didnt think about how to word it before i started typing. sorry

ashman01 · « **Reply #19 on:** Feb 20, 2006, 09:26PM »

Quote from: proact on Feb 3, 2006, 03:22PM

i cruise at 110 down to phillisland in 5th gear at 2.5 thou rpm which i think is pritty good.
if your travelling at 100 at 3.5 thou rpm thats not good ratio.
Unless auto's are shit!!!

ROLF at this guy. Looks like antrx is part of an experiment on what would happen if they gave a 5yr old a computer, internet connection and the antrx url and u get this guy! Haha

Jono · « **Reply #20 on:** Feb 20, 2006, 10:27PM »

Both my dad and the guy who now runs his business (both auto transmission mechanics with decades experience) recommend not using O/D for city driving. Constantly changing to and from 4th gear wears the clutches out really fast. Yes, autos have clutches.

Alister · « **Reply #21 on:** Mar 11, 2006, 11:14PM »

Quote from: Jono on Feb 20, 2006, 10:27PM

Both my dad and the guy who now runs his business (both auto transmission mechanics with decades experience) recommend not using O/D for city driving. Constantly changing to and from 4th gear wears the clutches out really fast. Yes, autos have clutches.

Yerp, that's true. Not many people realise it though...

bigpud2012 · « **Reply #22 on:** Apr 14, 2006, 12:52PM »

Quote from: Gangstanza on Feb 4, 2006, 10:34AM

ROFL AT THIS THREAD.

Seriously you can FEEL the difference if O/D is on or off, it's not rocket science.

yeah i knocked my little O/D switch when vacumning my car last week and i couoldnt understand why it was reving at 2100rpm at 60km/h when it normally revas at around 1400-1500 rpm.

Then after a couple of days i realised the little O/D wtitch was pushed in, opps.

but after reading this thread i realised i didnt see any O/D switch light on my dash

Rake · « **Reply #23 on:** Apr 15, 2006, 07:51PM »

Blown bulb maybe

bigpud2012 · « **Reply #24 on:** Apr 15, 2006, 08:06PM »

Quote from: Rake on Apr 15, 2006, 07:51PM

Blown bulb maybe

meh, i now know if she is running a little high ont he rpm what i will check first.

cant be stuffed pulling out the dash again.

oh btw how are the wheels going? --> giving you easier redline possibilities

Rake · « **Reply #25 on:** Apr 15, 2006, 11:17PM »

lol wheels aren't bad

borgtj · « **Reply #26 on:** Apr 15, 2006, 11:30PM »

Quote from: Jono on Feb 20, 2006, 10:27PM

Both my dad and the guy who now runs his business (both auto transmission mechanics with decades experience) recommend not using O/D for city driving. Constantly changing to and from 4th gear wears the clutches out really fast. Yes, autos have clutches.

I disagree with that statement,i am an A.S.E. certified transmission tech with over twenty years experience in this field,in forth(OD) the band thats holds in second also holds in forth along with the high(3rd clutches) I never shut off my overdrive and it works quite well with well over 130 thousand miles since I overhauled this transaxle @ 68 thousand miles.
I got this car for 200 dollars from a customer at the shop where I work and the customer did not want to repair his 90 Stanza Xe which i feel is the best car I have owned since I started driving.

kennykoala · « **Reply #27 on:** Apr 16, 2006, 12:38AM »

I agree with the A.S.E guy.

I have had my '90 Auto Corsair for 11 years now. It is the original gearbox/clutch etc and the norm for me is to have the overdrive on.....no problem. vehicle currently has 252, 000 k's on the odo..

Dano Da Bomb · « **Reply #28 on:** Apr 17, 2006, 06:46PM »

I guess it's up to personal preference in the end personally i don't see the need to use it unless you actually need to

Jamz13 · « **Reply #29 on:** May 12, 2006, 09:55PM »

overdrive light should be on when the overdrive butten is out and off when butten is in on all models

eurisko · « **Reply #30 on:** May 12, 2006, 10:23PM »

Quote from: borgtj on Apr 15, 2006, 11:30PM

I disagree with that statement,i am an A.S.E. certified transmission tech with over twenty years experience in this field

Granted, but you are missing the most important statement...

Quote from: Jono on Feb 20, 2006, 10:27PM

...recommend not using O/D for city driving. Constantly changing to and from 4th gear wears the clutches out really fast.

Hes not saying not use overdrive... just not in the city.

David · « **Reply #31 on:** Aug 23, 2008, 09:08PM »

How to use Over Drive the right way is to only put it on once you get to 80ks and over i keep it off when driveing in 60 zone

cruizer · « **Reply #32 on:** Aug 23, 2008, 09:15PM »

Hint to you mate.

DON'T dig up threads that are over 2 years old without considerable contribution to the point in the thread.