11-25-2023, 10:57 AM
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#2 (permalink)
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A True Z Fanatic
Join Date: Jan 2016
Location: Atlantic SE
Posts: 1,361
Drives: '10 K23 ST 7AT
Rep Power: 30526
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Quote:
Originally Posted by Bilazaurus
Hi. Since I bought my used 370Z several years ago, it's been bugging me that my speedo is way off from any readings on my GPS. I have checked it with Google Maps on three separate mobiles. It's around 10% (maybe a bit less) too high. Speedo shows 100km/h and my GPS shows 92-93km/h. Do these readings happen to other Z owners? What makes gives me a bit of a clue is that the previous owner equipped Z with aftermarket rims (Work). But the tyre profile and rim size is like stock : 275/35ZR/19 on rear and 235/40ZR/19 on front. Could my rims differ (although too 19") so much from stock 19" that it has different diameter, thus false reading?
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The wheels don't matter it's the overall height of the tire that determines speedo error. Keep in mind not all brands size is exactly the same. A 275/35/19 could be 27.4" high for Firestone but 27.9" for Michelin.
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