Improving low rev pulling power 75 CDTi

apxc15 · 6th October 2007, 18:43

I recently traded my 01 CDT saloon (116) for a 04 CDTi tourer (131) and whilst it has more power above 2000 RPM it is pretty lackluster under that. The Maf has been replaced a couple of days ago but not improved things. I had considered a RoverRon plug and play mod but my insurance company want's an extra £120 pa if I do. How can I improve low down power with out incurring extra insurance premiums, or chopping bits off the car. Any tips would be greatly appreciated. I loved my CDT but it is proving hard to love this replacement.

SteveWaller · 6th October 2007, 18:56

Disabling the EGR valve by clamping the vacuum pipe helped on improve low end power on mine. I have also fitted Ron's synergy box and a BMC air filter. Is still a bit flat below 2k, but much better than it was.

Keith · 6th October 2007, 21:40

Unplug the maf just to make sure it is not duff
Don't assume there is not the possibilty that the new one is also duff

Also it might be worth checking yours against another 131 CDTi and maybe even veryifying it is a 131

apxc15 · 11th October 2007, 15:37

Thanks for your suggestions. It is definitely a 131 and the MAF is ok. Tried crimping the hose to the ERG and also disconnected the hose into the filter box in case of a breathing fault. Still no improvement. Finally replaced the air filter (standard FAM) and that has made a slight improvement. I think it is the surge of power over 2000rpm making it feel a bit sluggish below that. I will have to learn to be a bit less heavy on the loud pedal I guess.

JohnDotCom · 11th October 2007, 15:41

Phone around re Insurance and Ron's boxes.
Some don't charge at all others only a small premium difference, some of course won't insure you!
That sounds a lot extra!!

Jules · 11th October 2007, 20:52

If you were used to a CDTi, there must still be a fault on your CDTi as they normally have bags more power under 2000 revs than the old 115.

Another avenue of power loss to check is the inter cooler outlet pipe. Yours might be the later type inter cooler housing in which case there are no O rings, but it's worth checking.
Very difficult to see though without dismantling or get yourself a very bendy mirror.

See this thread;

http://www.the75andztclub.co.uk/foru...ead.php?t=9643

JohnDotCom · 11th October 2007, 23:08

Link missing Jules.

and typical I can't find it.

Jules · 11th October 2007, 23:40

Silly me
I've put in now see post # 6

JohnDotCom · 11th October 2007, 23:50

Thanks Jules.
I have bookmarked it now for the future.

6th October 2007, 18:43	#1
apxc15 Newbie Rover 75 Tourer CDTi Connoisseur SE. Join Date: Oct 2007 Location: Marbella Posts: 23 Thanks: 0 Thanked 0 Times in 0 Posts	Improving low rev pulling power 75 CDTi I recently traded my 01 CDT saloon (116) for a 04 CDTi tourer (131) and whilst it has more power above 2000 RPM it is pretty lackluster under that. The Maf has been replaced a couple of days ago but not improved things. I had considered a RoverRon plug and play mod but my insurance company want's an extra £120 pa if I do. How can I improve low down power with out incurring extra insurance premiums, or chopping bits off the car. Any tips would be greatly appreciated. I loved my CDT but it is proving hard to love this replacement.

11th October 2007, 20:52	#6
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	If you were used to a CDTi, there must still be a fault on your CDTi as they normally have bags more power under 2000 revs than the old 115. Another avenue of power loss to check is the inter cooler outlet pipe. Yours might be the later type inter cooler housing in which case there are no O rings, but it's worth checking. Very difficult to see though without dismantling or get yourself a very bendy mirror. See this thread; http://www.the75andztclub.co.uk/foru...ead.php?t=9643 __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block Last edited by Jules; 11th October 2007 at 23:42..

11th October 2007, 23:40	#8
Jules This is my second home ZT 260 SE Twilight and 10 other 75 ZT's :O Join Date: Jan 2007 Location: Conwy NORTH WALES Posts: 11,094 Thanks: 512 Thanked 1,116 Times in 763 Posts	Silly me I've put in now see post # 6 __________________ [SIGPIC][/SIGPIC] Newbies do now!! 1. Plenum drains..all 3 or 4 year dependent 2. Cooling fan..All speeds functioning 3. Bonnet cable divider block

6th October 2007, 18:56	#2
SteveWaller Avid contributor Rover 75 cdti Contemporary SE Join Date: Aug 2007 Location: Northern Ireland Posts: 199 Thanks: 1 Thanked 1 Time in 1 Post	Disabling the EGR valve by clamping the vacuum pipe helped on improve low end power on mine. I have also fitted Ron's synergy box and a BMC air filter. Is still a bit flat below 2k, but much better than it was.

6th October 2007, 21:40	#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	Unplug the maf just to make sure it is not duff Don't assume there is not the possibilty that the new one is also duff Also it might be worth checking yours against another 131 CDTi and maybe even veryifying it is a 131

11th October 2007, 15:37	#4
apxc15 Newbie Rover 75 Tourer CDTi Connoisseur SE. Join Date: Oct 2007 Location: Marbella Posts: 23 Thanks: 0 Thanked 0 Times in 0 Posts	Thanks for your suggestions. It is definitely a 131 and the MAF is ok. Tried crimping the hose to the ERG and also disconnected the hose into the filter box in case of a breathing fault. Still no improvement. Finally replaced the air filter (standard FAM) and that has made a slight improvement. I think it is the surge of power over 2000rpm making it feel a bit sluggish below that. I will have to learn to be a bit less heavy on the loud pedal I guess.

11th October 2007, 15:41	#5
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Phone around re Insurance and Ron's boxes. Some don't charge at all others only a small premium difference, some of course won't insure you! That sounds a lot extra!!

11th October 2007, 23:08	#7
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Link missing Jules. and typical I can't find it.

11th October 2007, 23:50	#9
JohnDotCom * Rover 75 FaceLift Tourer CDTi 170BHP Auto ConnSE 2005 Model Starlight Silver Join Date: Nov 2006 Location: Abergele Posts: 28,735 Thanks: 0 Thanked 6 Times in 5 Posts	Thanks Jules. I have bookmarked it now for the future.