Auto gearbox poor performance - Page 2

kaiser · 15th July 2020, 06:41

The gearbox will not affect the performance of the car at all, provided it does not slip or send a restricted performance command.
The shift quality can be affected but if there was a specific problem with the gearbox it would be quite noticeable and not disappear in SPORT (

) mode.

This is not what I think we have here, - at all.
This is lack of oomph, simple and easy.

MissMoppet · 15th July 2020, 19:00

My (re-mapped 160) diesel is quicker and much more responsive than my 2.5V6. That's how it is.

SD1too · 15th July 2020, 19:07

Quote:

Originally Posted by MissMoppet

That's how it is.

It need not be though Dave. If you'd care to give your 2.5 V6 the VIS and cam cover breather medication, you will reap the reward.

Simon

SCP440 · 15th July 2020, 19:34

A convertor can chew up energy if in poor condition. Just because it has low mileage if that has mainly been done in traffic that can ware a convertor. Some cars suffer with this more than others, ask BMW 5 series owners.

The first thing I would check is the colour of the gearbox oil and how it smells. Any contamination or smells and you need to factor this is. Just replacing the fluid wont fix it, it might put off a rebuild but only by a few months or miles.

Branflake · 15th July 2020, 20:47

That's great information from all of you - thanks. We're going to view the car again at the weekend so I hope my friend bites the bullet and buys it. It will be good to apply your advice and bring the performance back up to where it should be.

goltho · 15th July 2020, 20:52

Quote:

Originally Posted by SD1too

Contact Dave (Stocktake) Craig. He specialises in the repair, restoration and modification of the VIS system. Removal and refitting alone would not be expensive at any garage.

I can vouch for this. My recently-acquired 2.5 ZT was somewhat reluctant from start up to c3000rpm. Turned out the balance VIS motor was not working, plus its flap wasn't closing correctly as apparently is their want.

Dave Stocks (stocktake) charged £50 for a rebuild including postage. I was without it for only four days. Taking them out is honestly a breeze - just unclip the connector(s) and then Philips screws, all accessible. The difference is really noticeable - I now have balanced power from zero to infinity!

It's smooth and muscular (unlike me

).

The only issue you might have is determining which if either of the two motors is faulty.

Dougie.

MissMoppet · 16th July 2020, 19:25

Quote:

Originally Posted by SD1too

It need not be though Dave. If you'd care to give your 2.5 V6 the VIS and cam cover breather medication, you will reap the reward.

Simon

Well, BigRuss ran his beady and knowledgeable eye over it and said that's it - I accept his expert verdict.

rrobson · 16th July 2020, 20:54

It needs its head kicking in a bit!

Vis motors may well be to blame and they can cause problems with the v6’s lacklustre performance but the kv6 isn’t worth bothering with unless the rev needle is past the number 4!

The gearboxes are pants though, especially if your not used to them. They will thank you for an oil change but the design is nearly 30 year old. Smooth, absolutely. Good at transmitting power quickly, not really...

roverbarmy · 16th July 2020, 21:04

Quote:

Originally Posted by rrobson

The gearboxes are pants though, especially if your not used to them. They will thank you for an oil change but the design is nearly 30 year old. Smooth, absolutely. Good at transmitting power quickly, not really...

Sounds perfect for my (old man) style of driving!

15th July 2020, 06:41	#11
kaiser This is my second home 75 Tourer 2.5 Auto, 1.8T, 75V8ZT Join Date: Jun 2007 Location: Johannesburg ZA Posts: 6,200 Thanks: 1 Thanked 859 Times in 613 Posts	The gearbox will not affect the performance of the car at all, provided it does not slip or send a restricted performance command. The shift quality can be affected but if there was a specific problem with the gearbox it would be quite noticeable and not disappear in SPORT () mode. This is not what I think we have here, - at all. This is lack of oomph, simple and easy. __________________ Worth his V8 in gold

15th July 2020, 19:00	#12
MissMoppet Posted a thing or two R 75 Tourer diesel Conny 2002, V6 Conny saloon petrol 2003 Join Date: Mar 2013 Location: Taunton Posts: 1,125 Thanks: 212 Thanked 406 Times in 223 Posts	My (re-mapped 160) diesel is quicker and much more responsive than my 2.5V6. That's how it is. __________________ Rover 75 Tourer Conny 2002 remapped 160 auto, R75 V6 2.5L auto Connoisseur 2003

16th July 2020, 20:54	#18
rrobson I really should get out more....... 75 tourer cdti, MG ZS 180, nissan terrano & 1.8t rover 25 Join Date: Feb 2010 Location: Pontefract Posts: 2,643 Thanks: 17 Thanked 295 Times in 218 Posts	It needs its head kicking in a bit! Vis motors may well be to blame and they can cause problems with the v6’s lacklustre performance but the kv6 isn’t worth bothering with unless the rev needle is past the number 4! The gearboxes are pants though, especially if your not used to them. They will thank you for an oil change but the design is nearly 30 year old. Smooth, absolutely. Good at transmitting power quickly, not really... __________________ How to view a car - everything you need to help you inspect a used car VIS motor tester avalible to local members Injector removal tool and auto gearbox pressure tester now available

15th July 2020, 19:34	#14
SCP440 I really should get out more....... MG ZT-T 260 Join Date: Feb 2016 Location: Witney Posts: 2,504 Thanks: 6 Thanked 910 Times in 571 Posts	A convertor can chew up energy if in poor condition. Just because it has low mileage if that has mainly been done in traffic that can ware a convertor. Some cars suffer with this more than others, ask BMW 5 series owners. The first thing I would check is the colour of the gearbox oil and how it smells. Any contamination or smells and you need to factor this is. Just replacing the fluid wont fix it, it might put off a rebuild but only by a few months or miles.

15th July 2020, 20:47	#15
Branflake Regular poster None at the moment Join Date: Apr 2008 Location: London Posts: 47 Thanks: 18 Thanked 13 Times in 7 Posts	That's great information from all of you - thanks. We're going to view the car again at the weekend so I hope my friend bites the bullet and buys it. It will be good to apply your advice and bring the performance back up to where it should be.