A note on tyre pressures and tyre wear

B

Busterboo

Veteran
Just had 'Vehicle Health Check' at Sytner BMW. All well. In details are tyres.

Contentiously to some, I run 36psi front & 44psi rear. Consistent wear across the tread is one reason why:

NSF 3.8 3.8 3.8
OSF 4.2 4.2 4.2
NSR 5.0 5.0 5.0
OSR 4.4 4.4 4.4

(Note: the fronts are older than the rears.)
 
Ah ha! I've spotted your ploy!
Pump the rears up so hard they spend most of their time bouncing through the air, hence very little wear.
Stick a couple more pounds in and they'll see you out :poke: :P
 
Looking again at the numbers why aren't the fronts & rears closer in wear rates :? not even the same side wearing faster or slower :cry: very odd
 
mr wilks said:
Looking again at the numbers why aren't the fronts & rears closer in wear rates :? not even the same side wearing faster or slower :cry: very odd
Click to expand...

That neighbour slammed the door so hard it twisted the chassis :D
 
enuff_zed said:
mr wilks said:
Looking again at the numbers why aren't the fronts & rears closer in wear rates :? not even the same side wearing faster or slower :cry: very odd
Click to expand...

That neighbour slammed the door so hard it twisted the chassis :D
Click to expand...

Repeated right turns at junctions and a heavy right foot :D
 
Busterboo said:
mr wilks said:
Busterboo said:
Did you with your 35is?
Click to expand...
No real tyre wear to monitor , only covered 300 miles in the 3 months i owned it :( just couldn't get on with the DCT :cry:
Click to expand...
What was it about the DCT that you didn't like?
Click to expand...

By comparison to the previous manual 35i I thought it numbed a already dull drive :o its no secret the E89 (any 89) lacks any real driver involvement no matter the bhp :( love the looks roof up or down & a great car for A to B in comfort & style but a sports car they will never be . My miles are all weekend pleasure & just didn't enjoy the car / box combo at all
Another major annoyance was the DCT was slow to react at parking speeds ( no complaints hitting a slip road with foot down ) & also easy to fool just like previous DSG boxes i have had . They may have double clutches to ready the next change but each & every time i drove away from my house it was expecting me to gear up from 2nd yet i was approaching a hill junction with good vision that doesn't always require a fully halted car , the stock auto boxes in previous E86s coped far better & so does my wifes laborious C Class auto .
I guess now the replies will be " ahh , you get the best when changing the dct manually " :oops: perhaps but the bond didn't form & felt little enthusiasm for driving it that way :( its gone to a good home & no regrets selling it .
I notice they (dct) are no longer offered as a option in the G29 & replaced with traditional Zf 8 speed :? Is that a cost thing or is there little benefit in the DCT ?
 
mr wilks said:
Busterboo said:
mr wilks said:
No real tyre wear to monitor , only covered 300 miles in the 3 months i owned it :( just couldn't get on with the DCT :cry:
Click to expand...
What was it about the DCT that you didn't like?
Click to expand...

By comparison to the previous manual 35i I thought it numbed a already dull drive :o its no secret the E89 (any 89) lacks any real driver involvement no matter the bhp :( love the looks roof up or down & a great car for A to B in comfort & style but a sports car they will never be . My miles are all weekend pleasure & just didn't enjoy the car / box combo at all
Another major annoyance was the DCT was slow to react at parking speeds ( no complaints hitting a slip road with foot down ) & also easy to fool just like previous DSG boxes i have had . They may have double clutches to ready the next change but each & every time i drove away from my house it was expecting me to gear up from 2nd yet i was approaching a hill junction with good vision that doesn't always require a fully halted car , the stock auto boxes in previous E86s coped far better & so does my wifes laborious C Class auto .
I guess now the replies will be " ahh , you get the best when changing the dct manually " :oops: perhaps but the bond didn't form & felt little enthusiasm for driving it that way :( its gone to a good home & no regrets selling it .
I notice they (dct) are no longer offered as a option in the G29 & replaced with traditional Zf 8 speed :? Is that a cost thing or is there little benefit in the DCT ?
Click to expand...

The DCT does have issues with circumstances like you describe, you have to learn to drive it a bit differently to a manual, coasting to junctions seems to confuse the hell out of the DCT. It does take more than 300 miles to get accustomed to it.

The reason they are ditching the DCT in some models is purely cost. The M cars all get the DCT still.
 
mr wilks said:
Busterboo said:
mr wilks said:
No real tyre wear to monitor , only covered 300 miles in the 3 months i owned it :( just couldn't get on with the DCT :cry:
Click to expand...
What was it about the DCT that you didn't like?
Click to expand...

By comparison to the previous manual 35i I thought it numbed a already dull drive :o its no secret the E89 (any 89) lacks any real driver involvement no matter the bhp :( love the looks roof up or down & a great car for A to B in comfort & style but a sports car they will never be . My miles are all weekend pleasure & just didn't enjoy the car / box combo at all
Another major annoyance was the DCT was slow to react at parking speeds ( no complaints hitting a slip road with foot down ) & also easy to fool just like previous DSG boxes i have had . They may have double clutches to ready the next change but each & every time i drove away from my house it was expecting me to gear up from 2nd yet i was approaching a hill junction with good vision that doesn't always require a fully halted car , the stock auto boxes in previous E86s coped far better & so does my wifes laborious C Class auto .
I guess now the replies will be " ahh , you get the best when changing the dct manually " :oops: perhaps but the bond didn't form & felt little enthusiasm for driving it that way :( its gone to a good home & no regrets selling it .
I notice they (dct) are no longer offered as a option in the G29 & replaced with traditional Zf 8 speed :? Is that a cost thing or is there little benefit in the DCT ?
Click to expand...

The 7 Speed DCT has faster upshifts, but is more jerky in day to day driving, and more expensive.

The 8 Speed ZF8 has faster downshifts and is smoother in day to day driving, and is cheaper.
 
i do feel tyre pressures are like religion and politics, always contentious, no one is ever swayed or convinced, do we even agree our slightly different cars have different needs in tyre pressure ? i run 32psi all round on my e85 3.0i, i did try the stiff as a board tyre pressures but as our cars already look like noddys car, i didnt feel like bouncing down the road and completing the effect for no benefit 8)
 
I thought the DCT was replaced with the ZF8 in later E89s.
I think technology just moved on and modern multi-ratio autos are at least as good as DSG boxes and are cheaper to produce as they can use the same across the whole range & other ranges.
 
Lazza said:
I thought the DCT was replaced with the ZF8 in later E89s.
I think technology just moved on and modern multi-ratio autos are at least as good as DSG boxes and are cheaper to produce as they can use the same across the whole range & other ranges.
Click to expand...

Possibly Dct is a solution to a problem that doesn't exist now there are better auto boxes :?
Its certainly made me wary of future cars i buy ( current 997 being manual) as a 981 Cayman is on my list next year & plenty of those are Pdk , i will be looking for manual now whereas before id have taken either .
 
enuff_zed said:
Ah ha! I've spotted your ploy!
Pump the rears up so hard they spend most of their time bouncing through the air, hence very little wear.
Stick a couple more pounds in and they'll see you out :poke: :P
Click to expand...
A cunning plan
 
You must log in or register to reply here.
Back
Top Bottom