Chriswillo · Apr 10, 2023

Hello All,
Odd fault with my Disco 2 TD5.
Car runs fine but when revs go over 2500 in 3rd gear, there is a surge in power.
EGR has been removed
Stage 2 remap
De cat straight through exhaust.
New injector harness (small amount of oil cleaned regularly)
New modulator - (pipes on order)
I’ll post up nano on live data recording when I get home.
Any ideas??

also took a quick video of it but can’t upload

thanks

Chriswillo · Apr 10, 2023

Landmark2 · Apr 10, 2023

Hi, I assume it is a manual in which case check the clutch switch. This is designed to smooth the revs out when changing gear. The facelift model has it under the clutch master cylinder, pre facelift is somewhere on o/s wing.
HTH,
Griff

Chriswillo · Apr 10, 2023

Landmark2 said:
Hi, I assume it is a manual in which case check the clutch switch. This is designed to smooth the revs out when changing gear. The facelift model has it under the clutch master cylinder, pre facelift is somewhere on o/s wing.
HTH,
Griff

Cheers for that Griff - yes, you are correct it is indeed a manual, I did check this on the nanocom and it seemed to report back as working from what i could see, I will check the wiring out - appreciated

sierrafery · Apr 10, 2023

As long as the clutch switch shows the change of it's inputs on nanocom then IMO it's a mechanical clutch slip at that point, if your clutch is old you should replace it together with the DMF and get done with it for the next (let's say)100K miles(provided you are driving it normally not like you stole it)

Chriswillo · Apr 10, 2023

sierrafery said:
As long as the clutch switch shows the change of it's inputs on nanocom then IMO it's a mechanical clutch slip at that point, if your clutch is old you should replace it together with the DMF and get done with it for the next (let's say)100K miles(provided you are driving it normally not like you stole it)

Thanks Sierrafery - always treat my Td5 with respect, never gets thrashed at all - it is still the original clutch so not done too bad out of it - deep down i had a suspicion it could actually be the actual mechanical clutch on its way out, tried to rule out as many other potential "easier" (less expensive) fixes but alas I think you are on the money with that. Thanks for the help and advice. Now let's see how much i can get it done for as I am not taking on that job myself, just don't have the room.

Nodge68 · Apr 10, 2023

Chriswillo said:
deep down i had a suspicion it could actually be the actual mechanical clutch on its way out

It is. It's a classic clutch slip symptom.
The clutch isn't able to transfer the torque between 2000 and 3000 RPM, so it slips allowing the engine RPM to climb faster than the road speed. Once the engine torque drops off at about 3000 RPM, the engine speed holds while the vehicle speed catches up.

Chriswillo · Apr 10, 2023

Nodge68 said:
It is. It's a classic clutch slip symptom.
The clutch isn't able to transfer the torque between 2000 and 3000 RPM, so it slips allowing the engine RPM to climb faster than the road speed. Once the engine torque drops off at about 3000 RPM, the engine speed holds while the vehicle speed catches up.

Thanks for the advice - I'll let you know how i get on. I have to tow my Tourer down to Cornwall and back in the next few months so need this sorting.. Appreciate all of the comments fellas

Chriswillo · Jun 11, 2023

Just thought I’d report back on the Disco problem I posted about. The diagnosis was spot on, had the clutch and DMF replaced and now jobs a good ‘un car hasn’t missed a beat, just done my annual Cornwall holiday with my Tourer in tow, all running as it should

- thanks for the advice

Landmark2 · Jun 12, 2023

Glad your sorted and had a good holiday

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