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New tires - size up!
I went into to RADIAL TIRES of SACRAMENTO this morning after researching sizes this past weekend.
Background: THe 02 Q45 Sport came from the factory w/245/45/18 (26.5 inch diameter)on 18x7.5 alloy rims. At 60k miles I went to a 255/45/18 (27.0" diameter) The base of the Strut tower on the front is the limiting factor to how tall a tire can be without using 30mm spacers( BAD:eek:) http://i678.photobucket.com/albums/v...5clearance.jpg We tried a 245/50/18 and there is an 1/8 inch gap!!! THe diameter is 27.7 inches. The tire weighs 31lb and the current size weighs 30 lbs. They ordered them today and will install tomorrow. |
You could cut off the spring platform and fit threaded sleeves so you can fit 2.5" diameter springs:D
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Got the tires on today.
new 245/50/18 27.7" dia. at 55mph 1625rpms old 255/45/18 27.0 dia at 55 mph 1725rpms will do mpg runs in a day or so. |
as you can see there is no more room!!!
talkhttp://i678.photobucket.com/albums/v...PG/tiregap.jpg about cutting it close!!! |
...do you think there's "contact" when driving at high speeds and centrifugal forces are attempting to "enlarge" the wheel diameter?
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If you install coilover suspension you dont need so big spacers to get more room. Or change you ET on your wheels.
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No problem with any rubbing. I had some obdII codes that I had to resolve. And am still addressing some ecu issues pior to my TTT (trip to texas) on Oct 12. But I just ran a brief highway run. At 63mph 1775rpms got 30.9mpg (didnot have the grill block or the front underbelly panel in place) epa is 22mpg highway. |
...cars need an "electronic" wheel diameter compensation "box" to allow for use of different diameter wheels & tires!
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somebody was posting that in europe it's illegal to go up or down in size........
I run a garmin gps on the dash right above the scangauge, so it gives the correct speed. That way I don't tie up one of the 4 displays on the scangauge. |
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