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Wheels & Tires 350Z Rollers and Rubbers

19" wheels!!!!!

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Old Nov 17, 2002 | 07:35 PM
  #2  
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not sure anyone knows the answer to these questions, so dont be dissapointed...
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Old Nov 17, 2002 | 07:36 PM
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What you will need is a speedometer recalibrator. If the linkage from the tranny to the speedo is mechanical, this is a small gearbox that bolts in-line with the speedo cable. If the linkage is electronic, then it's a small timing generator that connects in-line as well.

More important than getting your speedometer to display correctly, is that the ECU(s) get corrected information so that ABS, VDC, speed limiter, etc. don't freak out on you.

Perhaps one of the guys with the tech manual can tell us what the linkage type is. I'd be willing to bet that it's electronic. You can find programmable electronic recalibrators from BlackRobotics and AutoTrans.
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Old Nov 17, 2002 | 07:45 PM
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IF THE DIAMETER, AND CIRCUMFRENCE OF THE OUTER TIRE STAY THE SAME YOU WONT HAVE TO CHANGE ANYTHING!!!
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Old Nov 17, 2002 | 08:24 PM
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Agreed, but he's talking about a 2" increase in wheel diameter. He'd need to find some seriously low profile tires to come out with the same net diameter.
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Old Nov 17, 2002 | 08:36 PM
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actually the sidewall on the 17s is about an inch larger(slightly less) so the outside diameter is very close to the same as the 18" rims. and people have put 19s on the car before without much trouble. the difference between them is very minute, and when you do the math you find the speedometer isnt even off by 1% while the error in the speedo is probably higher than that.
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Old Nov 17, 2002 | 11:20 PM
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tire wear also provides error in speedos. heck, most speedos are calibrated at 55mph and that's about it. anything else in the range.. and it can be off by a margin of a %age.

19's would look great, but unfortunately my main concern would be drivability - it will be a little harsher and a few little bumps and you'll need to get them repaired or some new rims.
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Old Nov 18, 2002 | 12:46 AM
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Originally posted by Schatten
tire wear also provides error in speedos. heck, most speedos are calibrated at 55mph and that's about it. anything else in the range.. and it can be off by a margin of a %age.

19's would look great, but unfortunately my main concern would be drivability - it will be a little harsher and a few little bumps and you'll need to get them repaired or some new rims.
It depends, with 19" wheels your sidewall on the tire on a wider tire only drops about .3-.5 inches from the stock 18" on the 350Z... The ride actually gets smoother with nicer tires and when the tire is wider the ride is less bumpy, believe it or not.
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Old Nov 18, 2002 | 12:47 AM
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in japan, I'm quite sure of that.
on the track, I'm quite sure of that.

Texas roads.. well, that's another story. =)
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