A note on tyre pressures and tyre wear

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...
I felt the same way when I first got my DCT, it took a while to get used to it but once you do it is very easy to drive in any way you wish to. I always drive mine manual out of preference and love it..
 
I had my 35i serviced on Thursday last week. They “corrected” the tyre pressures up to the run-flat pressures. I could tell straight away as it felt much harsher, skipping over rougher roads, bouncing on mid-corner bumps and feeling more nervous on wet roads.
I’ll be setting the pressures back down to f36/r38 tomorrow.
 
Lazza said:
I had my 35i serviced on Thursday last week. They “corrected” the tyre pressures up to the run-flat pressures. I could tell straight away as it felt much harsher, skipping over rougher roads, bouncing on mid-corner bumps and feeling more nervous on wet roads.
I’ll be setting the pressures back down to f36/r38 tomorrow.
Click to expand...

:oops: its not about what's recommended , its about whats right & the driver should know their car well enough to know :wink:
 
Lazza said:
I had my 35i serviced on Thursday last week. They “corrected” the tyre pressures up to the run-flat pressures. I could tell straight away as it felt much harsher, skipping over rougher roads, bouncing on mid-corner bumps and feeling more nervous on wet roads.
I’ll be setting the pressures back down to f36/r38 tomorrow.
Click to expand...
I came to the 35iS from 5 years in an 911, so the 36/44 pressures were no surprise, because they're the same for both cars and neither car could or can be exploited to its best without them.

So, it's tempting to wonder, if yours is "much harsher, skipping over rougher roads, bouncing on mid-corner bumps and feeling more nervous on wet roads", that it's not the pressures that are the problem.
 
Busterboo said:
Lazza said:
I had my 35i serviced on Thursday last week. They “corrected” the tyre pressures up to the run-flat pressures. I could tell straight away as it felt much harsher, skipping over rougher roads, bouncing on mid-corner bumps and feeling more nervous on wet roads.
I’ll be setting the pressures back down to f36/r38 tomorrow.
Click to expand...
I came to the 35iS from 5 years in an 911, so the 36/44 pressures were no surprise, because they're the same for both cars and neither car could or can be exploited to its best without them.

So, it's tempting to wonder, if yours is "much harsher, skipping over rougher roads, bouncing on mid-corner bumps and feeling more nervous on wet roads", that it's not the pressures that are the problem.
Click to expand...

Comparing apples with oranges Buster :roll: my current 997 i run the recommended 36F 44R pressures , it drives right & feels right but then you have a totally different car totally different suspension , geometry & configuration .
The engine being at the rear so over the driven wheels & wheels themselves are 11j wide with 305 30 19 tyres as opposed to a 35is on 9j rims with 255 30 19 or 8.5j with 255 35 18 .
 
I run 38F and 40R 19 inch Goodyear asymmetrics.
Even wear across the tyres but the rear would skip if i went up to 44 and i have come down from 42 as the crown of the tyre was wearing more than the edge on the previous tyres so 42 was a touch too high.
 
My 35i doesn’t have a rear engine...

After 15 years of playing with MX5s on the track, I have a fairly good feel for tyres and can feel the difference between feedback & harshness, which people very often confuse.

In summer when the roads are warm I have the rear pressure up to 40 but now the roads are cold and often wet I put it down to 38 to get more compliance & grip.

Definitely nothing wrong with my car. All tyres in good condition. Geo checked annually. Just serviced last Thu at a specialist. Feels great.
 
The three previous posts and some others in this thread obviously contain valuable experience and good sense. When push comes to shove, though, I have to follow the highest authority - the manufacturers. Fortunately, their figures work for me.

One reason they do, I believe, is that I'm on 18" wheels.
 
You must log in or register to reply here.
Back
Top Bottom