sc430 with 245 45 18 contstant correction
12-13-17, 11:04 PM
#1
Pit Crew
Thread Starter
sc430 with 245 45 18 contstant correction
I've had the above size Michelin Pilot as/plus T for 5 years. I have noticed the car needs a bit more constant course straight line correction..little steering and countersteering. I got the car with awful run flats, and I think I just got advice to do the 45's on this board.
Is it possible the tires are 'ovrerring' the surface of the road, or the suspension geometry.
The bonus question: has anyone had a fart sound from the front end when the car body in front comes up to normal height after moderate braking but usually on a slight downhill? I am fighting the installers that they should put OEM pads rotors back on...they already went from semi ceramic, which were making this sound even worse, now where it does it intermittently.
Is it possible the tires are 'ovrerring' the surface of the road, or the suspension geometry.
The bonus question: has anyone had a fart sound from the front end when the car body in front comes up to normal height after moderate braking but usually on a slight downhill? I am fighting the installers that they should put OEM pads rotors back on...they already went from semi ceramic, which were making this sound even worse, now where it does it intermittently.
12-16-17, 12:19 AM
#2
Our 08 430 had pirrelli cinturado chinese p1’s when we got it. Bad wander,ride, noise and handling.
accidental replace by Costco with Michelin pilot as. Better but not perfect. Groove tracked on so cal freeways.
900 miles later Costco fixed their mistake by putting in the Michelin pilot power pro non as,
flawless. No wonder, no noise, better ride, turns better.
added the upgrade rear bar and a shock tower brace.
Shop told me front and back alignment both off. And it drove excellent.
Only a a short drive since and the tire pressure was set 4 to 7 psi high. Fixed.
longer drive tomorrow
accidental replace by Costco with Michelin pilot as. Better but not perfect. Groove tracked on so cal freeways.
900 miles later Costco fixed their mistake by putting in the Michelin pilot power pro non as,
flawless. No wonder, no noise, better ride, turns better.
added the upgrade rear bar and a shock tower brace.
Shop told me front and back alignment both off. And it drove excellent.
Only a a short drive since and the tire pressure was set 4 to 7 psi high. Fixed.
longer drive tomorrow
12-16-17, 05:18 AM
#3
OP, would you consider going back to OEM size if your rims are 18s ( assuming they are ). I am on 245/40/18s with a slightly more aggressive offset aftermarket rims in the three warm seasons. Straight as an arrow on poor man's Michelins ( BF Goodrich ). I do have a bit more course correction on my winter tires ( cheaper Falken Eurowinters ) but I did not expect that much from winter tires anyway. Even Blizzaks on one of my other cars require more course correction than regular good quality all seasons so I am not complaining about course correction on my Falkens.
Got no weird noises on braking but then I went through a bunch of unsatisfactory combos in the past. Now on after market drilled slotted rotors and Akebono ceramic pads. Really like this combo, progressive feel and strong bite when needed. Only time I get noise is when the car has just been washed and the rotors and pads are wet - I get some juddering noise but it goes away quick after they dry out.
Got no weird noises on braking but then I went through a bunch of unsatisfactory combos in the past. Now on after market drilled slotted rotors and Akebono ceramic pads. Really like this combo, progressive feel and strong bite when needed. Only time I get noise is when the car has just been washed and the rotors and pads are wet - I get some juddering noise but it goes away quick after they dry out.
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SC430 - 2nd Gen (2001-2010)
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