Auto lockup

Ford Prefect · 8th February 2013, 10:05

I am wodering when the auto box on the V6 locks up in top? irritatingly it does not seem to have done so at 50, which will hurt the MPG

RN3212 · 8th February 2013, 13:21

I have a 2.0 V6 and it locks up at about 62mph

James.uk · 8th February 2013, 22:30

You can get a good idea by getting the car in top, then slowly decrease speed untill the car changes down. The lock up speed will be slightly faster than it's drop out speed.

My diesel locks up at about 50 mph, and drops out at about 45 mph.

...

crofts · 10th February 2013, 04:23

Quote:

Originally Posted by James.uk

You can get a good idea by getting the car in top, then slowly decrease speed untill the car changes down. The lock up speed will be slightly faster than it's drop out speed.

My diesel locks up at about 50 mph, and drops out at about 45 mph.

...

Agree with you James. Mine is also a CDTi & don't know if this is different to the V6 though another member above mentions his.
In general I can coax it into top around 48mph and mine also comes out at 45 or so.
Wish T4 could enable lock-in at 30. There's no strain on the engine at this speed and it would be so much more economical around town. Wonder, for example if there is a solenoid for this, perhaps (or another way)

Ford Prefect · 22nd February 2013, 13:37

Hmm, interesting, I wonder if there are any issues with fitting a CDT gearbox ECU to a 2.5 V6.. apart from it changing up earlier that is, might be intereting to try as long as its not going to fry anything! The 2.5 V6 certanly seems to lock up at about 62-65 whihc TBH is insane and I can't see any locgical reason fro this, the 825 would be locked up at about 55 IIRC and returned way better MPG unless it had blown its heads! and the 825 was a larger car, I can't see weight being an issue

SD1too · 22nd February 2013, 14:04

I must admit that I am a bit confused by this thread. Are you all discussing torque converter lock up? In everyday driving I can't say that I can detect it at all; its engagement seems to be extremely smooth on my car. Are you sure you're all not feeling an upchange into 5th gear?

Simon

crofts · 24th February 2013, 03:19

Quote:

Originally Posted by Ford Prefect

I am wodering when the auto box on the V6 locks up in top? irritatingly it does not seem to have done so at 50, which will hurt the MPG

Yes, does seem unnecessary as surely the V6 has adequate power to accept changing into 5th, as with the diesel

Ford Prefect · 24th February 2013, 20:14

So the next question is.. how do I identify a CDT gearbox ECU? as I think it may be intersting to try one and see what happens, as long as it won't do anything hideous to the geabox itself. There are a few of them on eBay but no more information than the part number, no idication of what car they came from. Once I have the ECU would it just work or di I need to pair it up with anything else?

crofts · 25th February 2013, 03:10

Get hold of 'seancar'. He may have an answer and will almost certainly have an ECU at a reasonable price. He also has T4 so will know if programming an auto ECU is necessary.

Ford Prefect · 25th February 2013, 07:41

Actually I have had a thought about this.. I wonder if this was done deliberatly to stop the 2.5 V6 auto having better economy than the 2.0 V6?
Anyonw know what speed the 1.8 auto locks up at? this may have a better suited programmme to the CDT (rather perversely) as I'd hope it won't get upset at seeing engine RPM over 4K which I would guess a CDT ECU will

8th February 2013, 10:05	#1
Ford Prefect Loves to post Rover 75 Saloon Join Date: Dec 2012 Location: Wantage Posts: 306 Thanks: 0 Thanked 0 Times in 0 Posts	Auto lockup I am wodering when the auto box on the V6 locks up in top? irritatingly it does not seem to have done so at 50, which will hurt the MPG __________________ [SIGPIC][http://www.the75andztclub.co.uk/foru...ne=1355821399][/SIGPIC] 1999 Rover 75 Connesieur 2.5 Dealer Launch Spec LPG (Its very blue) 1999 Landrover Disco2, proper one with a V8 no TD5 rubbish 1997 TB called Ed, runs on grass 1992 Range Rover Vogue SE (LPG) 1975 MG Midget 1959 Austin Healey Sprite I think I may have a problem

8th February 2013, 13:21	#2
RN3212 Gets stuck in Rover 75 Classic SE 2.0V6 Auto Moonstone Green Join Date: Sep 2008 Location: Roscommon Posts: 839 Thanks: 315 Thanked 46 Times in 34 Posts	I have a 2.0 V6 and it locks up at about 62mph __________________ [SIGPIC][/SIGPIC]

22nd February 2013, 13:37	#5
Ford Prefect Loves to post Rover 75 Saloon Join Date: Dec 2012 Location: Wantage Posts: 306 Thanks: 0 Thanked 0 Times in 0 Posts	Hmm, interesting, I wonder if there are any issues with fitting a CDT gearbox ECU to a 2.5 V6.. apart from it changing up earlier that is, might be intereting to try as long as its not going to fry anything! The 2.5 V6 certanly seems to lock up at about 62-65 whihc TBH is insane and I can't see any locgical reason fro this, the 825 would be locked up at about 55 IIRC and returned way better MPG unless it had blown its heads! and the 825 was a larger car, I can't see weight being an issue __________________ [SIGPIC][http://www.the75andztclub.co.uk/foru...ne=1355821399][/SIGPIC] 1999 Rover 75 Connesieur 2.5 Dealer Launch Spec LPG (Its very blue) 1999 Landrover Disco2, proper one with a V8 no TD5 rubbish 1997 TB called Ed, runs on grass 1992 Range Rover Vogue SE (LPG) 1975 MG Midget 1959 Austin Healey Sprite I think I may have a problem Last edited by Ford Prefect; 22nd February 2013 at 13:40..

22nd February 2013, 14:04	#6
SD1too Doesn't do things by halves Rover 75 2.5 Connoisseur Auto (1999) Dealer launch model. Join Date: Mar 2007 Location: Former Middlesex Posts: 20,511 Thanks: 1,587 Thanked 3,749 Times in 3,181 Posts	I must admit that I am a bit confused by this thread. Are you all discussing torque converter lock up? In everyday driving I can't say that I can detect it at all; its engagement seems to be extremely smooth on my car. Are you sure you're all not feeling an upchange into 5th gear? Simon __________________ "Whatever is rightly done, however humble, is noble." Sir Henry Royce.

24th February 2013, 20:14	#8
Ford Prefect Loves to post Rover 75 Saloon Join Date: Dec 2012 Location: Wantage Posts: 306 Thanks: 0 Thanked 0 Times in 0 Posts	So the next question is.. how do I identify a CDT gearbox ECU? as I think it may be intersting to try one and see what happens, as long as it won't do anything hideous to the geabox itself. There are a few of them on eBay but no more information than the part number, no idication of what car they came from. Once I have the ECU would it just work or di I need to pair it up with anything else? __________________ [SIGPIC][http://www.the75andztclub.co.uk/foru...ne=1355821399][/SIGPIC] 1999 Rover 75 Connesieur 2.5 Dealer Launch Spec LPG (Its very blue) 1999 Landrover Disco2, proper one with a V8 no TD5 rubbish 1997 TB called Ed, runs on grass 1992 Range Rover Vogue SE (LPG) 1975 MG Midget 1959 Austin Healey Sprite I think I may have a problem

8th February 2013, 22:30	#3
James.uk Passed Away 2002 Pale Blue. Rover 75 CDTi Connoisseur auto. 170K miles Join Date: Dec 2008 Location: Near the M67. Posts: 14,509 Thanks: 199 Thanked 585 Times in 397 Posts	You can get a good idea by getting the car in top, then slowly decrease speed untill the car changes down. The lock up speed will be slightly faster than it's drop out speed. My diesel locks up at about 50 mph, and drops out at about 45 mph. ...

25th February 2013, 03:10	#9
crofts I really should get out more....... 2003 Rover 75 Conn. SE Auto Tourer 131 ps CDTi Join Date: Nov 2006 Location: Bristol Posts: 2,512 Thanks: 38 Thanked 67 Times in 55 Posts	CDTi Auto ECU Get hold of 'seancar'. He may have an answer and will almost certainly have an ECU at a reasonable price. He also has T4 so will know if programming an auto ECU is necessary. __________________ Rover 75 CDTi SE Connoisseur Tourer (2003) In desirable STARLIGHT SILVER (now restored to it's former glory with all the chrome !)

25th February 2013, 07:41	#10
Ford Prefect Loves to post Rover 75 Saloon Join Date: Dec 2012 Location: Wantage Posts: 306 Thanks: 0 Thanked 0 Times in 0 Posts	Actually I have had a thought about this.. I wonder if this was done deliberatly to stop the 2.5 V6 auto having better economy than the 2.0 V6? Anyonw know what speed the 1.8 auto locks up at? this may have a better suited programmme to the CDT (rather perversely) as I'd hope it won't get upset at seeing engine RPM over 4K which I would guess a CDT ECU will __________________ [SIGPIC][http://www.the75andztclub.co.uk/foru...ne=1355821399][/SIGPIC] 1999 Rover 75 Connesieur 2.5 Dealer Launch Spec LPG (Its very blue) 1999 Landrover Disco2, proper one with a V8 no TD5 rubbish 1997 TB called Ed, runs on grass 1992 Range Rover Vogue SE (LPG) 1975 MG Midget 1959 Austin Healey Sprite I think I may have a problem