Celica Forums General Discussion General overdrive

i think there was a thread on this already. what is the od for?

saves gas...

saves gas... turn it off and you can feel slightly more power

Its a freeway gear so the engine doesnt work as hard, Do your around town driving with it off and only use it on the highway.

ooo. the mystery is solved

it has a nice boost to it.

O/D is just our 4th gear

I was told if you drive long distances, like freeway, for a long period of time at relatively the same speed, you turn it off on the offramp. Lets the engine cool a bit. Its the auto version of 4th gear...but not quite.

Don't keep it off a long time, your milage goes down drastically. So I would leave it on, even going around town. Save more gas. There are no noticable increases in power or speed with it off. I wouldn't worry about it. Just leave it on at all times.

haha yups...

Don't go over 75mph with it off... its best practice to keep your RPM's in the 2k to 4k range while driving constant high speeds

As per page 87 and 88 of the 2001 Celica owner's manual:

"You can select either third gear (with overdrive OFF) or forth gear (with overdrive ON) by pushing this button"

ie; with OVER DRIVE OFF, your celi maxes out at 3rd gear and will never switch to 4th.

...

Celica GT/2ZZ-GE Recomended Shifting Speeds

1 to 2 or 2 to 1 ... 15 mph / 24 km/h
2 to 3 or 3 to 2 ... 25 mph / 40 km/h
3 to 4 or 4 to 3 ... 40 mph / 65 km/h

MAXIMUM ALLOWABLE SPEEDS:

5-speed
1st gear ... 35 mph / 56 km/h
2nd gear ... 57 mph / 92 km/h
3rd gear ... 78 mph / 126 km/h
4th gear ... 106 mph / 171 km/h

6-speed
1st gear ... 37 mph / 60 km/h
2nd gear ... 58 mph / 93 km/h
3rd gear ... 80 mph / 128 km/h
4th gear ... 101 mph / 163 km/h
5th gear ... 129 mph / 208 km/h

...

As per page 94 of the 2001 Celica owner's manual

So according to the manual - all you guys who own an Automatic Celica who say you were doing 120mph, your speedo was either off, or you were red-line'n it for several miles

^^ good post Isaac. It weeds out the bullshitters.

Fastest i've done is 105. Then again, there was some downhill slope.

Ive done 120 in my auto celica. No BS so i dont know what the deal is.

I've got a pic of my speedo at over 120, and I still had a ways to go on the tach. The auto has diff. gear ratio's than the manual, otherwise we'd get the fuel economy of a Mack truck.

(edit) the ratios are here... you can see the final drive ratio for the automatic GTS would allow for quite a bit more speed than 4th gear on either the 5 or 6 speed manual transmissions (for which you posted the max speeds per gear)

https://celicahobby.com/tech/2002celica.html

i believe it says he posted it for the gt not the gts

my car is at 4000 rpms at about 82 mph...

i always drive at that... i need another gear.

I also use it "braking with the engine" turn it off... and if you need to stop ... push the top button and 2... (stronger engine braking)... then L (maximun engine braking)... ( I never use L )
source: Owner's Manueal pg. 83

the book is wrong b/c i have had my car to 121 mph. That's all it would go, i watched the needle hit 121 and i felt the car just kinda not go anymore. And i also have an auto GT.

i had my car up to 135 and it went. and still chould go

time to get a manual...

by definition overdrive is any gear that has a gear ratio of lower than 1:1 (like 0.75:1) so it allows you to travel at higher speeds at lower rpms and since you're at a low rpm you save gas

exactly

triptronic owns all! (blast from tha past)

I still can't believe that gimmick got me to buy an auto.

^^what were you thinking??? driving w/ clutch is fun!

2001.. or 2002... the programming is different - read my post - see YEAR

I'll prolly do a tranny swap when I swap out the engine at 150,000. Where I live there is so much damn traffic I didn't feel like having to deal with it. I wish I had though.

yeah, i'm from LA, n traffic is a bitch...but i'm so attacted to the stick shift that i'm willing to put up with it...cuz i know one day i'm gonna spend the rest of my life driving an auto..so i'm enjoying it as much as i can rite now.

or...where the input shaft spins slower than the output shaft. same thing.

ive done 135 in mine no BS either!

so whats the deal?

lol same here buddy !! But its all good I dont really care, I love my car!

I would kill myself if i didn't have a clutch

I can't walk and chew bubbble gum at the same time . Why would I need a shifter? I spend more time fiddling with the stereo than actually driving.

We are all praying for it to fall apart.