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dannyo' in houston
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Everything posted by dannyo' in houston
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Thanks to all for your input. I've ordered the larger tires and will find out out if there is any fender or wheel well rubbing and will see if the speedometer error is improved. I'll warn everyone if there are consequences. However, I'm no race car driver and doubt that I'll be able to discern slight changes at the limits of cornering. My usual comment is that my car is more of a parade float than a race car. It is a tip cab after all. :)
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I thought that this remedy for the "fast-reading" speedometer would have been investigated for a 2002 C2 by now, but I haven't found a thread that addresses this issue. So....I gather that from the lack of definite answers that no one here is sure whether the 235x40x18 and 295x35x18 tire sizes will cause a problem (such as rubbing the fender in a turn especially while the springs are compressed or cause an ABS problem of some sort); nor does anyone know for sure where the speedometer sensor gets its input. Maybe the reason that Porsche makes the speedo read fast with OE tires is so that for legal reasons it will not read slow with the largest diameter tires that can be accommodated??...just thinking out loud.
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I am a contributing member but have only been a lurker for several months. I have a 2002 C2 Cab, 3.6 liter, Tip, 18" Carrera II wheels (8x18-50 front and 10x18-65 rear). I bought it used a year ago with Sumitomo HTR III tires, sizes: 225-40-18 front and 295-30-18 rear. My speedometer reads 3 miles per hour faster than my GPS at speeds between 40 mph and 90 mph. Since I need new tires, I called one of the local Porsche dealers here in Houston and was told that the original equipment tires were 235-40-18 front and 295-35-18 rear. (This dealer quoted over $1450 for N-rated Michelin PS2s plus labor. Whew...expensive!) Though these sizes are larger than what I learned was OE here, I am leaning toward buying them (probably not from the Porsche dealer) with the assumption that the slightly larger diameter tires will make my speedometer read closer to accurate. What do you think? Also, where does the speedometer get its input; that is, front wheels, rear wheels or pitot tube? ;)