Re: Z3 handling - (was Old Z3???)
- From: "frischmoutt" <frischmoutt@xxxxxxx>
- Date: Sat, 5 Sep 2009 19:41:22 +0200
"Jeff Strickland" <crwlrjeff@xxxxxxxxx> a écrit dans le message de news:
h7e70b$gao$1@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
[...]
"frischmoutt" <frischmoutt@xxxxxxx> wrote in message
news:4a998e87$0$17775$ba4acef3@xxxxxxxxxxxxxxxxx
byWhen I ordered the car, the baseline was 225x50x16 for the 4 wheels and
themoption: 225x45x17 on the front and 245x40x17 on the rear.
I chose the option because of the look of the hell the style # 42 have.
However the handling is very poor on bad roads and the tramlining pretty
heavy as soon as grooves are present. This is particularly noticeable on
the
right lane on some parts of the motorways.
I got the car with Dunlop tires (SP Sport perhaps), I replaced all of
SPby Bridgestone Potenza S03 then by Potenza SE050 on the rear and Dunlop
cleaningSport MAXX on the front.
It seems that the new Dunlop on the front improve a little bit the
handling.
However this may be subjective.
The rims are not painted but varnished. Although an alomst weekly
with wash and wax, they started to oxydize some years ago and now the
propagation is running.
The repair cost, needing to separate the two parts of the rims, is
comparable to the price of aftermarket brand new ones.
I was wondering if going back to the baseline dimensions would solve the
handling issues, the reason why I'm looking for references.
Regards
The 245/40 fits a wider rim than the 225/45.
As an option to buying a new set of rims, take the current rims to the
chrome shop and have them done new with chrome. They (the shop) will strip
the existing finish and do the rims over with chrome. This will make them
shiny, which may or may not be a good lok for you, but should be cheaper
than buying all new rims.
This is another question I've to dig up with several companies in order to
compare.
Basically to correctly process the rims, they need to separate the two parts
they are made of: the rim itself and the hub/beams part, then they've to
carefully reajust the parts and balance the wheels. This is the reason why
the cost is so heavy. The other option is to get them stripped, without
dismantling, then painted. IMO, would result in an ugly look.
[...]
Whether your car follows grooves cut on purpose into the roadway, orfollows
depressions created by the multitudes of cars and heavy trucks that haveof
gone before you, it is doing what you paid extra to get. Your car is doing
what wide, short, light, and tight car is supposed to do. I do not think
reverting to the base tire is going to fix this. You will still have all
the same variables -- wide, short, light, and tight. The only differenceis
that you will gain 1/2 inch of sidewall flex.[...]
You might find that 5psi of air pressure can do more than anything else.
When tires are soft, there is a larger contact patch and the pliant tire
will grip the freeway grooves and road ruts with the enthusiasm you expect
expensive tires to have. When you fill the tires with a bit more air then
they call for, the contact patch actually decreases and the tires do not
grip the road surface quite so strongly.
I'm already used to put 3 psi more (0.2 bars) on the rear and 1.5psi in the
front tires. More than that produces a tendency to make the car floating a
little bit.
So, I've to carry my cross tirelessly (no pun in that !), cursing the mayor
until he decides to fill-up these damned ruts and cuttings. At the evidence,
the palm trees of the seaside boulvard are far more important than the
streets 500 meters beyond.
Regards
.
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