2.5 V6 Performance issue

The Yellow Peril · 30th April 2007, 13:49

I am fortunate enough to have both a 2.0L Diesel (05) and a 2.5 V6 75 (W plate), The Diesel goes like a rocket (no modding - yet) but the 2.5 V6 accelerates like a milk float, and struggles to make 90 (where it's allowed obviously). I've had the V6 for 6 or 7 years and never really noticed the performance issue untill I got the diesel which made me realise how slow the V6 is.

Has anyone else come across a similar problem with the V6 being a little sluggish? Or is mine just in need of a darn good tuning? Or is the deisel just a lot faster?

Regards

Andrew

EnEnGee · 30th April 2007, 15:40

VIS valves/ inlet manifold anyone?

Sorry I live in DERV land so the KV6 is a bit of a mystery to me, but you read these things! The V6 I have had a ride in was a Y reg and went like the preverbial horses droppings of a shovel. Can't remember whether the 2.0 or the 2.5 though.

Keith · 30th April 2007, 15:50

Your V6 should be faster in all respects than your Diesel except maybe 5th gear acceleration, better get it checked over is it auto or manual?
Or maybe a cheaper option, take it to a rolling road and see what it is producing

If it is running out of go at 90 something is not right.
.

Karsten · 30th April 2007, 19:21

My 2.5 is accelerating fine up to 120mph, then the acceleration isn't that great but goes up to 130ish...
Probably you need to shift into 4th

soixante-quinze · 30th April 2007, 20:55

Definitely summat wrong. I also have the pleasure of owning both, and despite the derv having been Ronned, I still go for the v6 when I'm after a more enthusiastic run.

Simon · 30th April 2007, 22:13

Andy, you're just down the road from me (sort of) If you would like to see how the KV6 should go then give me a shout...

If you can hear rattles (loud ones) from under the hood then you have VIS troubles. Also check your air filter is clean and your putting decent fuel in the tank. If yours is an auto then when was the 'box last checked/oil change? Come to mention it, when was the last service on the car? If all of these were recent things (ie on schedule according to MGR recommendations) then somethings amiss.

The Yellow Peril · 1st May 2007, 07:46

Thanks Simon, I might take you up on your kind offer

Our car is an auto, it was last serviced at 65000 miles, including cam belt change, and had a full service, that was 4000 miles ago. It has always been serviced at the correct intervals and has to my mind never been quick, ever since we bought it 7 years ago. I just assumed that given the leather and the wood and all that soundproofing etc, that it was a heavy old thing and only perfomed at this level.

There are no unusual knocking noises comming from the bonnet area, but two things I have observed, the accelerator travels a long way befroe much happens and when accelerating from about 65 in Drive, there's a lot more revving noise but not much action. It seem to take a long time to pick up speed. Is this a sympton of an autobox about to fail?

Thanks for your comments

AndyG

Keith · 1st May 2007, 09:44

I trust it is definately a 2.5?

Teflon · 1st May 2007, 12:38

Quote:

Originally Posted by andygz

I have observed, the accelerator travels a long way befroe much happens
AndyG

I had the same on my 2.0 V6 when I first got it. I adjusted the throttle cable to take out the slack and it transformed the car - much more responsive and far more top end performance. Best of all, it was a 10 minute, no cost fix.

Hope this helps,

Cliff

Keith · 1st May 2007, 12:59

Yes good point Teflon, worth checking.

This is a common "mod" on Citroen HDI engined cars as the throttle cable is held on by a clip and often these were not properly fitted leading to a fair degree of free travel and at the other end only a partially open throttle, most owners never even knew about it!

Mind you it used to work wonders for the MPG!

30th April 2007, 13:49	#1
The Yellow Peril Posted a thing or two Primrose Yellow 75 V6 Conn SE Join Date: Feb 2007 Location: Hoar Cross, Staffordshire Posts: 1,176 Thanks: 23 Thanked 49 Times in 11 Posts	2.5 V6 Performance issue I am fortunate enough to have both a 2.0L Diesel (05) and a 2.5 V6 75 (W plate), The Diesel goes like a rocket (no modding - yet) but the 2.5 V6 accelerates like a milk float, and struggles to make 90 (where it's allowed obviously). I've had the V6 for 6 or 7 years and never really noticed the performance issue untill I got the diesel which made me realise how slow the V6 is. Has anyone else come across a similar problem with the V6 being a little sluggish? Or is mine just in need of a darn good tuning? Or is the deisel just a lot faster? Regards Andrew __________________ The Yellow Peril. Connesseur SE 2.5V6 Petrol Auto. Lovingly cared for, since 2000

30th April 2007, 19:21	#4
Karsten Avid contributor Rover 75 2.0 CDTi Saloon Conoisseur Join Date: Dec 2006 Location: Midleton, Cork Posts: 149 Thanks: 0 Thanked 0 Times in 0 Posts	My 2.5 is accelerating fine up to 120mph, then the acceleration isn't that great but goes up to 130ish... Probably you need to shift into 4th __________________ Karsten It's 106 miles to Chicago, we got a full tank of gas, half a pack of cigarrettes, it's dark and we're wearing sunglasses!

1st May 2007, 07:46	#7
The Yellow Peril Posted a thing or two Primrose Yellow 75 V6 Conn SE Join Date: Feb 2007 Location: Hoar Cross, Staffordshire Posts: 1,176 Thanks: 23 Thanked 49 Times in 11 Posts	Thanks Simon, I might take you up on your kind offer Our car is an auto, it was last serviced at 65000 miles, including cam belt change, and had a full service, that was 4000 miles ago. It has always been serviced at the correct intervals and has to my mind never been quick, ever since we bought it 7 years ago. I just assumed that given the leather and the wood and all that soundproofing etc, that it was a heavy old thing and only perfomed at this level. There are no unusual knocking noises comming from the bonnet area, but two things I have observed, the accelerator travels a long way befroe much happens and when accelerating from about 65 in Drive, there's a lot more revving noise but not much action. It seem to take a long time to pick up speed. Is this a sympton of an autobox about to fail? Thanks for your comments AndyG __________________ The Yellow Peril. Connesseur SE 2.5V6 Petrol Auto. Lovingly cared for, since 2000

30th April 2007, 15:40	#2
EnEnGee Posted a thing or two CDT Tourer (SORN) & 2.0 V6 Saloon Join Date: Nov 2006 Location: Sittingbourne Posts: 1,058 Thanks: 2 Thanked 11 Times in 8 Posts	VIS valves/ inlet manifold anyone? Sorry I live in DERV land so the KV6 is a bit of a mystery to me, but you read these things! The V6 I have had a ride in was a Y reg and went like the preverbial horses droppings of a shovel. Can't remember whether the 2.0 or the 2.5 though.

30th April 2007, 15:50	#3
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Your V6 should be faster in all respects than your Diesel except maybe 5th gear acceleration, better get it checked over is it auto or manual? Or maybe a cheaper option, take it to a rolling road and see what it is producing If it is running out of go at 90 something is not right. .

30th April 2007, 20:55	#5
soixante-quinze Avid contributor Rover 75 Saloon Join Date: Nov 2006 Location: Kilcock Posts: 141 Thanks: 0 Thanked 2 Times in 1 Post	Definitely summat wrong. I also have the pleasure of owning both, and despite the derv having been Ronned, I still go for the v6 when I'm after a more enthusiastic run.

30th April 2007, 22:13	#6
Simon Banned - Join Date: Nov 2006 Location: - Posts: 10,318 Thanks: 0 Thanked 4 Times in 3 Posts	Andy, you're just down the road from me (sort of) If you would like to see how the KV6 should go then give me a shout... If you can hear rattles (loud ones) from under the hood then you have VIS troubles. Also check your air filter is clean and your putting decent fuel in the tank. If yours is an auto then when was the 'box last checked/oil change? Come to mention it, when was the last service on the car? If all of these were recent things (ie on schedule according to MGR recommendations) then somethings amiss.

1st May 2007, 09:44	#8
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	I trust it is definately a 2.5?

1st May 2007, 12:59	#10
Keith This is my second home ZT400 Join Date: Oct 2006 Location: Ellesmere Posts: 5,948 Thanks: 0 Thanked 43 Times in 29 Posts	Yes good point Teflon, worth checking. This is a common "mod" on Citroen HDI engined cars as the throttle cable is held on by a clip and often these were not properly fitted leading to a fair degree of free travel and at the other end only a partially open throttle, most owners never even knew about it! Mind you it used to work wonders for the MPG!