Go Back   Team-BHP > Under the Hood > Technical Stuff


Reply
 
Thread Tools Search this Thread
Old 21st July 2010, 15:50   #1
BHPian
 
Join Date: Jan 2007
Location: Pune
Posts: 258
Thanked: 26 Times
Default Santro automatic : What is the use of the OD (overdrive) button?

Dear All,

Can anyone provide me user manual for automatic santro?
I want to know what is the use of OD (overdrive) button on the gear stick - when it should be used, how does enabling/disabling it affect the performance etc.

Thx in adv.
subscrive is offline   Reply With Quote
Old 21st July 2010, 16:01   #2
BHPian
 
Join Date: Sep 2009
Location: Mumbai
Posts: 541
Thanked: 13 Times
Default

You could've searched the forum for the use of overdrive. This has been discussed on some threads.

Anyways, the OD button is to indicate if the car can move to the OD (4th) gear or not. Typically you always keep it pressed (OD On) - display panel light will be off.

If you go to speeds above around 60, OD is activated by itself and the vehicle moves to top gear. This give you a smoother / silent performance as well as will improve your fuel efficiency.

You keep OD off only if you intentionally want to avoid your vehicle to move to 4th gear.

HTH.
jigbarai is offline   Reply With Quote
Old 21st July 2010, 16:10   #3
Distinguished - BHPian
 
sgiitk's Avatar
 
Join Date: Dec 2007
Location: Kanpur
Posts: 7,163
Thanked: 3,758 Times
Default

The overdrive button is just a hangover from the 3-speed box days. They did not bother to mofigy the shifter when they went four speed, so put the fourth on the OD button! Essentially if it is ON then you have a 4-speed box, else a 3-speed box.

In normal driving keep it on all the time. If you are going down hills use 2 or L.
sgiitk is offline   Reply With Quote
Old 21st July 2010, 17:11   #4
BHPian
 
Join Date: Jan 2007
Location: Pune
Posts: 258
Thanked: 26 Times
Default

- Ok. Thx.

- Searching for santro automatic user manual etc gives automatic vs manual etc threads
subscrive is offline   Reply With Quote
Old 1st August 2010, 15:11   #5
Senior - BHPian
 
kuttapan's Avatar
 
Join Date: May 2007
Location: Melbourne
Posts: 1,155
Thanked: 12 Times
Default

Quote:
Originally Posted by sgiitk View Post
The overdrive button is just a hangover from the 3-speed box days. They did not bother to mofigy the shifter when they went four speed, so put the fourth on the OD button! Essentially if it is ON then you have a 4-speed box, else a 3-speed box.

In normal driving keep it on all the time. If you are going down hills use 2 or L.
O/D off button is provided in other vehicles as well and there is a purpose for this button -it's just not there because of the reason you mention.I remember driving a Mazda Tribute/Ford Escape and using it to good effect. If you want to do some spirited driving within city and do some sharp overtake maneuvers, this button can come in handy, to provide that extra zip and not lose steam by suddenly switching to overdrive. For most people and most situations, it is of no use.
kuttapan is offline   Reply With Quote
Old 1st August 2010, 15:25   #6
Distinguished - BHPian
 
sgiitk's Avatar
 
Join Date: Dec 2007
Location: Kanpur
Posts: 7,163
Thanked: 3,758 Times
Default

@kuttapan: I quite know what the OD button is. We are talking in the context of the Santro AT (the same box is in the i10 AT and after beefing up in the Verna AT).

In the 1970s ODs were installed in some cars, with OD available in 3rd and 4th (almost all boxes were 4 speed). Thus effectively you had 1-4, 3+OD and 4+OD. It was axiomatic that the drive in top gear would be 1:1. Any gearing higher than this was dubbed as OverDrive. It was only after the FWD cars became popular that the top, or even the gear(s) below, deviated from this 1:1 or direct drive rule.

Take one of the highest cases today Civic AT is 0.55:1!
sgiitk is offline   Reply With Quote
Reply


Thread Tools Search this Thread
Search this Thread:

Advanced Search


Similar Threads
Thread Thread Starter Forum Replies Last Post
help me choose for 60% highway use 40% city use nawabnabeel SUVs, MUVs & 4x4s 43 7th April 2009 17:48
Use of Push Button Starter mithun Technical Stuff 33 8th December 2007 23:45
WagonR (automatic) or Santro (automatic) Blue Thunder Hatchbacks 6 24th August 2007 08:39
OMG - Button leaves BAR for Williams!!! Rtech Int'l Motorsport 11 12th August 2004 15:11
Button to be Schumi successor?? Dippy Int'l Motorsport 5 29th April 2004 22:33


All times are GMT +5.5. The time now is 19:51.

Copyright 2000 - 2017, Team-BHP.com
Proudly powered by E2E Networks