Not registered? Then you're not seeing all there is to see. Do you want to contribute? Register now by clicking HERE!
www.VNCommodore.com Support Site - Forums Page © 2005 - 2017
    Forums Page 

 
Main Menu

Start Page  
Forums  
Register  
Recipe Book  
Active Topics  
Active Polls  
Forum Search  
Online Auctions  
Online Classifieds  
FAQ  
Greeting Cards  
Guestbook  
Disclaimer  
Contact Us  
Links  
Username:

Password:

Save Password
Forgot your Password?

 
www.VNCommodore.com Support Forums
 All Forums
 General Area
 General Chatter Area
 VN series 2 auto box - overdrive???
 New Topic  Topic Locked
 Printer Friendly
Author Previous Topic Topic Next Topic  
  Current Topic Rating: Total Rating: 0 | Join the Forum to Rate this Topic at: www.VNCommodore.com Support Forums  

new2vn
P Plater



23 Posts

Male

Posted - 27 Jan 2011 :  7:30:47 PM  Show Profile Send new2vn a Private Message
 
Hi Guys,
Just been taking my VN grandpa special out for a run on the freeway. It needed some cobwebs blown out of it. I don't think it's ever been over 80 km/h, everything seemed a bit stiff at first, but a couple of hundred Ks later and all was spinning well. It needed to free up wheel bearings a bit I think...

It is a stock V6 4 speed auto. From what I understand, the workshop manual says that the Trans is a 4 speed auto "with overdrive".

3rd gear is 1.00:1 ratio (usually this would be considered top gear) and 4th is 0.7:1 (which in a manual box would usually be considered 5th gear or a type of overdrive).

I got to about 90 km/h in 4th and the revs dropped back a bit.
Got to about 105 km/h and the revs dropped back even more.

It did all this with no loss of power, it seemed to tap into the available torque at lower revs, it still pulled up hills at 110 Ks just fine, without increasing revs.

I presume this is why the thing does so well with fuel economy out on the open road. (7 litres per 100 km on the freeway, instead of 12 L in the city)

Can anyone tell me what this "function" or "device" is and how it works. Clearly it is electronically controlled, hooked up to the ECU and the vehicle speed sensor on the tail shaft. But what does it actually do?

There are no more gears to select. How can it drop revs?
Is this part of the "Locking Torque converter" arrangement?

The workshop manual mentions nothing that I can find about it.

Thanks guys.
Report to Moderator

dryVN
Fully Licenced


food-burger

228 Posts

Male

Posted - 27 Jan 2011 :  8:28:05 PM  Show Profile Send dryVN a Private Message
 
Yeah your on to it , Its the lock up converter . Not sure how it works but the engine and box spin as one and there is no trans slip once it's on.

The car will come out of that mode once the accelerator is pushed hard or Kickdown is needed.

Also when you slow down below a set target speed , and or if the rev's drop too much.

In a VN its an all Hydraulic Trans , which works out some very basic functions with the ECU.
Report to Moderator Go to Top of Page

new2vn
P Plater



23 Posts

Male

Posted - 28 Jan 2011 :  04:13:54 AM  Show Profile Send new2vn a Private Message
 
Thought so, it does unlock the converter when I push the throttle going uphill, it will kickdown to 3rd if needed.

I wonder how it works?

Thanks mate.
Report to Moderator Go to Top of Page

dryVN
Fully Licenced


food-burger

228 Posts

Male

Posted - 28 Jan 2011 :  06:40:36 AM  Show Profile Send dryVN a Private Message
 
Also Welcome to the Site and it would be interesting to know.
Sounds like a nice ride mate , getting difficult to find a clean unmodified VN.
Report to Moderator Go to Top of Page

VNSVLE
Forum Moderator


smiley-blunder

1316 Posts

Male

Posted - 28 Jan 2011 :  10:00:13 PM  Show Profile Send VNSVLE a Private Message
 
This may give you a little more insight even though it is a camaro article it is the same box -

 

What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared.
Report to Moderator Go to Top of Page

new2vn
P Plater



23 Posts

Male

Posted - 29 Jan 2011 :  4:35:00 PM  Show Profile Send new2vn a Private Message
 
Thanks VNSVLE,
Thanks for that invaluable information, it's exactly what I am after. If I have any problems with this setup, now I know where to start looking. The workshop manual was not very helpful in this area.

Excellent post, much appreciated.

Cheers, Ben.
Report to Moderator Go to Top of Page

VNSVLE
Forum Moderator


smiley-blunder

1316 Posts

Male

Posted - 31 Jan 2011 :  12:20:54 AM  Show Profile Send VNSVLE a Private Message
 
Not a problem buddy we are here to help
 

What's the difference between understeer and oversteer?
Understeer is when the driver is scared.
Oversteer is when the passenger is scared.
Report to Moderator Go to Top of Page
  Previous Topic Topic Next Topic  
 New Topic  Topic Locked
 Printer Friendly
Jump To:
www.VNCommodore.com Support Forums © 2005 - 2017 Go To Top Of Page  
This page shown in 0.16 seconds.   Snitz Forums 2000
Do not Click Here
   
 


Currently 1599 user(s) online
 
Copyright © 2005 - 2017 by: Greening Computer Services