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Old 26th July 2019, 07:56   #11
Dorchester2
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I'm still very pleased with my 2.5 KV6 even with the auto box.
It's perfectly true that she's more reactive after 3200 revs, but that'll do for me. Put it in sport mode and that's better.
Now I'm even playing with the 4-3-2 positions: very helpful in the uphills & downhills and even to brake far more efficiently when arriving at a roundabout provided you're not closely followed by a bird minded foolhardy stop lights being off as a consequence.
Both my VIS motors were swapped less than 2 years ago for new ones.
I think that a remap on the KV6 would do good in two directions: enhancing the advance & improving mpg. Steve Abbott - Saws Tuning - 3 years ago has made a fantastic job on my modest 25 1.4 4 cyl. and I'm gobsmacked, as if I had a ZR or a 25 1.6, so much so that I can't recognize the engine!
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Old 26th July 2019, 10:29   #12
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Quote:
Originally Posted by Dorchester2 View Post
I'm still very pleased with my 2.5 KV6 even with the auto box.
It's perfectly true that she's more reactive after 3200 revs, but that'll do for me. Put it in sport mode and that's better.
Now I'm even playing with the 4-3-2 positions: very helpful in the uphills & downhills and even to brake far more efficiently when arriving at a roundabout provided you're not closely followed by a bird minded foolhardy stop lights being off as a consequence.
Both my VIS motors were swapped less than 2 years ago for new ones.
I think that a remap on the KV6 would do good in two directions: enhancing the advance & improving mpg. Steve Abbott - Saws Tuning - 3 years ago has made a fantastic job on my modest 25 1.4 4 cyl. and I'm gobsmacked, as if I had a ZR or a 25 1.6, so much so that I can't recognize the engine!
This is the first time I've ever read that you can/maybe should remap the KV6. To what effect? Has anyone done it? Will anyone do it? Downsides?

Chaper 2: forget it: did a search and found Saws is the Man. Lots here. Looks interesting . . .
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Last edited by MissMoppet; 26th July 2019 at 10:42..
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Old 26th July 2019, 16:59   #13
joel antonio
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Hi:

I have 3 Rovers all of them KV6 2.5 litters 2 are auto y manual. My humble recommendation:

Check that the Intake Manifolds butterflies are connected to the "bar" that is controlled by the vis motors.

My tourer was affected with both problems, an incredible rattle sound from the butterflies and unsoldered connector internally on the VIS.

After the change of the intake manifold for a new one, and resoldering the inside connections on the VIS motors the change in performance and economy was immediate. Including my smile

Kind regards

Joel Antonio
PS, Manual KV6 purrs more aggressive than auto box.
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Old 26th July 2019, 17:07   #14
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Originally Posted by MissMoppet View Post
This is the first time I've ever read that you can/maybe should remap the KV6. To what effect? Has anyone done it? Will anyone do it? Downsides?

Chaper 2: forget it: did a search and found Saws is the Man. Lots here. Looks interesting . . .
It would appear the remap on the KV6 was carried out on a car that had had a Cat removal and all the insides of the inlet manifold removed ??
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Old 26th July 2019, 18:24   #15
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I don't know if yours has leads on the front 3 plugs (early models) but mine has been transformed since I freed the flap on the VIS and changed the front leads and spark plugs. There was a factory bulletin about lead to plug cap connections deteriorating causing the spark to have to jump the gaps. The plugs on the front bank were eroded quite badly 2mm instead of 1mm . I also fitted the throttle/ fuel injector repair kit
My car has only done 50k but well worth the effort.
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Old 29th July 2019, 19:18   #16
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It would appear the remap on the KV6 was carried out on a car that had had a Cat removal and all the insides of the inlet manifold removed ??
Ive just read the very same thing on Saws, what do they mean by a "Gutted inlet manifold"?
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Old 30th July 2019, 09:49   #17
mh007
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Originally Posted by Outlaw 41 View Post
Ive just read the very same thing on Saws, what do they mean by a "Gutted inlet manifold"?
Some have split the plastic manifold & removed all the internal butterflies & control rods, therefore leaving all the tracts permanently open.

I'm on the fence with regards to results (apart from potentially getting rid of the 'death rattle' of course) & prefer to keep mine as standard.
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Old 30th July 2019, 11:37   #18
Dorchester2
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Quote:
Originally Posted by mh007 View Post
Some have split the plastic manifold & removed all the internal butterflies & control rods, therefore leaving all the tracts permanently open.

I'm on the fence with regards to results (apart from potentially getting rid of the 'death rattle' of course) & prefer to keep mine as standard.

I assume that if without VIS motors the car would have been more responsive and more efficient in petrol consumption why on earth fancying such a tricky device from the Rover engineer team ?
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Rover 75 V6 2.5 Auto Connie born 1 July 1999, 24 kOhms resistor, 10 kOhms manual starter, full E85, modified airbox, full derestricted SS exhaust line, power & torque remap -> 202 bhp
  • This vehicle was the 7,517th 75 to run off the production line, out of 112,381
  • This vehicle was the 1,190th 75 2.5 V6 Contemporary to be made out of 8,214
  • This vehicle was the 2,032nd 75 in Atlantic Blue Pearlescent (code: JEY) to be made out of 2,572 Atlantic Blue Pearlescent 75s
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Old 30th July 2019, 11:52   #19
stocktake
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Quote:
Originally Posted by Dorchester2 View Post
I assume that if without VIS motors the car would have been more responsive and more efficient in petrol consumption why on earth fancying such a tricky device from the Rover engineer team ?
Quite the opposite from the dyno results published here some years ago by Cannonite.
He had his 160 with a complete and WORKING vis set up running at 181 IIRC He commented that changing the inlet manifold for one that had been stripped out gave a less smooth curve and a less enjoyable driving experience.
To be fair others have said they noticed and increase in performance with everything removed but no figures were produced at the time and as you will appreciate each car will have its own quirks. My thought are if you drive flat out everywhere then the Vis set up is of no use to you otherwise it is.
Everyone has an opinion on them though
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Old 31st July 2019, 05:21   #20
kaiser
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Quote:
Originally Posted by Brunty View Post
My kv6 drives as it should, vis motors kick in around 3200 rpm, then at around 5000 rpm sounds like a formula 1 racing car, auto box normally changes gear at 6500 rpm. However last Saturday on the way back from nano meet with a boy racer on my tail in a Golf GTi, floored it, changed down 2 gears and went into the red at 7200 rpm, boy did it sound good, young lad behind must have wondered what was under the bonnet. Drive it as a sports car and it will perform!
Golf GTi? Way faster than your V6. Must have been a Citi Golf.
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