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JBL930 JBL930 is offline
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Join Date: May 2006
Location: UK
Posts: 1,172
I forgot about this thread, i may as well stick my data up here. The stock speedo with stock wheels is way off, and i mean WAY off! I was seeing as much as 13% difference, 150mph on the speedo was actually 128mph on the AX22 and GPS. The stock wheels and stock 4 speed gearing nets a top speed of around 187mph at 7000rpm, which is exactly what i found

I took a vid of my first run above 180mph, i will get more next time out, this is the only one i have at the moment VIDEO OF 182MPH RUN

I now have Ruf wheels with over sized 285/40/17 rear tyres, and the speedo is almost spot on, it still reads over, but it's now about 2MPH out at 150mph. The stock 4 speed is now good for 205mph at 7000rpm. I haven't had the chance to do a high speed pull with the new wheels, not sure i'll get the chance before i put the 5 speed box in, will report back when i have more to tell
87 930, 993 turbo engine, RS Tuning 520PS/515lbf-ft, Arrow Rods, ARP hardware, Solid lifters, G50-50, RS Flywheel, 890nm Sachs clutch, RSR coil overs all round, 993 C4 calipers front, 930 fronts on the rear, Ruf Speedlines.....
Old 540 BMW, XB12S Modified, for being a total hooligan
Old 12-22-2009, 04:49 PM
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