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Discussion Starter #1 (Edited)
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SO I HAVE A 520 CONVERSION , with stock gears 15/40 ,,, at 4500rpm the speedo shows 88 mph . but my gps shows 78 mph , , so even that the gears are stock number , with the 520 the unsprung weight is that much less , that the speedo is 10 mph off ,, ??? i hope you understand what im saying here ,
I believe stock gearing is *16*/40 so that's one reason your indicated MPH is too high. When I swapped from 16/40 to 15/41 I had to adjust my speedo by 17% to make it accurate. With stock gearing the speedo was off by about 7%...
 

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you could grab a speedohealer....mine came in yesterday and changing down by 14.2% mine reads perfect speed now...and it has a cool mountable button that shows you your top speed you've hit
 
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