Handling when driving on angled surface
- Thread starter 6cylinder
- Start date
Does your car have runflats on? They are notorious for causing "tramlining". Get them off and replaced if so 
How do you mean hard shifts? I'm assuming your car is an auto?
How do you mean hard shifts? I'm assuming your car is an auto?
6cylinder said:
Also might be worth checking they’re on the right way round……………
6cylinder said:Thanks guys
CDV delete? Is that a removal of the clutch delay valve? I am Danish so don't know all expressions
Tyres are likely the cause of the issues you have experienced
CDV is the clutch delay valve and to "delete" it is removing it, mine is auto but I am aware the the CDV does cause some issues in terms of the gear changes and how they feel though its likely subjective. Probably a CDV delete is the way forward there as well, though I am not the best placed to answer that one
Southwestz4
Member
I have a horrible 1st to 2nd change on my 3.0 e85 when I first got it ...I removed the delay valve and changed gearbox oil to Red Line MTL 75W80 GL-4 Manual Transmission Gear Oil.
Made a big difference
Made a big difference
Southwestz4
Member
For the handling issue check tyres and if they are runflats change them and have the wheel alignment checked maybe ? I have learnt with these cars you are 'more intouch ' with the road surface than softer suspension cars 
The 1st to 2nd change is quite challenging until you are used to it. CDV delete definitely changes the feel of the engagement. I haven’t tried changing the gearbox oil, but many members on higher mileages swear that this is transformational. The thing that works for me is changing at rather higher revs than in other cars, c.3k works for me.
Been checking up on tires
Michelin Pilot Sport 4 are not directional, they are not run-flat.
Size are 255/35R18 and 225/40R18, both are within specs.
I checked tire pressure with a better meter and pressure was 3psi to high back and 3psi to high front. That might be it, will test If not I will have it measured up at the garage.
GEAR
I changed gear oil last week, it didn't change much. I also noticed that changing gear at higher revs makes the shift better.
Will ask garage for price for CDV delete.
The car have only done 100.000km /62.000miles
Beside that, love the engine. It is so smooth down low and so angry when it get revs
Michelin Pilot Sport 4 are not directional, they are not run-flat.
Size are 255/35R18 and 225/40R18, both are within specs.
I checked tire pressure with a better meter and pressure was 3psi to high back and 3psi to high front. That might be it, will test
If not I will have it measured up at the garage.GEAR
I changed gear oil last week, it didn't change much. I also noticed that changing gear at higher revs makes the shift better.
Will ask garage for price for CDV delete.
The car have only done 100.000km /62.000miles
Beside that, love the engine. It is so smooth down low and so angry when it get revs
6cylinder said:
:wub: :wub:
Awesome shot
Devon
Mine also tends to tramline and wander on uneven surfaces. After reading about it and getting advice from other forum members, I'm going to try some Z4M spec offset lolypop bushes, like this:
https://www.powerflex.co.uk/product-details/Front+Wishbone+Rear+Bush,+Caster+Offset/11515.html
or
https://www.spring-loaded.co.uk/pro...6mm~Bush~Kit~1~Off~Set~for~BMW~Z4~E85~2002-08
https://www.powerflex.co.uk/product-details/Front+Wishbone+Rear+Bush,+Caster+Offset/11515.html
or
https://www.spring-loaded.co.uk/pro...6mm~Bush~Kit~1~Off~Set~for~BMW~Z4~E85~2002-08
Zulu4 said:
Excellent
Very interested to hear if they make a difference!I mostly use the car on smaller fun roads and they are often pretty bad... so
I just had a spin in Z4 after adjusting front tire pressure down to 33psi (was 36psi) and it is way better, only a bit tramlining left. Will take it down to 31psi to test again
