My clutch doesn’t slip but feels like it’s wearing thin when I pull away etc (doesn’t feel like it used to) and my torque/acceleration also feels off. Would a clutch that is wearing thin affect performance at all if it’s not slipping? Or is this more likely a separate engine issue? Mk2.5 tdci.

If it’s not slipping it won’t affect performance. Are you sure it’s not slipping slightly?

10 minutes ago, alexp999 said:

If it’s not slipping it won’t affect performance. Are you sure it’s not slipping slightly?

Well I’ve put it in 4th at about 25-30 and put foot down and it slowly picks up speed as normal, doesn’t appear to slip. I may just have a boost leak or some other issue like that then. Does forscan show you boost? 

4 hours ago, Jason87 said:

I’ve put it in 4th at about 25-30 and put foot down and it slowly picks up speed as normal, doesn’t appear to slip.

If I remember correctly what I used to know about engine output characteristics, that's probably not a good test, as at those low revs the power output is relatively low, compared with when the revs are at say 4500rpm. Try it at 4000 - 5000 rpm in 3rd and see if it slips.

Don't forget this is a diesel...maximum torque is around 1800rpm.  It's torque that slips clutches.

Top gear at 25-30 mph might be a better test.

Still doesn’t appear to be slipping. If it was a boost leak, would forscan pick that up at all? Or only if it was really bad? 

You can use a live data graph to watch the MAP and MAF readings.

If boost is leaking badly enough, you'll see less MAP increase than MAF.