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Can my mate do 130 in a 1.4 16V??
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[quote][i]Originally posted by Ian[/i] [quote][i]Originally posted by K11 NNL[/i] digital speedos and not speedo cables like older corsas...so no matter how big or small your wheels the digital speedo will still be accurate. [/quote]Incorrect I'm afraid. The electronic speedos have a sender in the gearbox which turns the final drive speed in to pulses which the dash then converts in to your speedo display. The digital to analogue conversion is inaccurate, as well as the gearing of the sender. Cable drive speedos just mechnically bring a geared drive to the clocks which then magnetically attracts the needle against the force of a retaining spring. This method is also inaccurate due to the tolerances and the physics of it all, and the fact that Rolex don't make speedos. Neither method is particularly accurate as they both rely on gearing and tolerances both within the mechanical and electronic conversions of the signals, plus legally they CANNOT under-read, but may over-read by up to 10%. This is designed in to the car, not just some scientic side-effect. They also of course take their information from the box, and therefore wheel speed will not affect your reading on the dash, but will affect actual speed travelled. There is also the issue that some cars cannot go the speeds which are claimed. The engine can only go a certain speed (rev limiter) and at that rev limit the gearing of the car and wheel size will dictate how fast you travel - assuming you can overcome air resistance. Some of the speeds quoted here are actually physically impossible without huge wheels, non-standard or mis-matched gearing (ie. the wrong box and no acceleration) and a raised rev limit. Thats assuming you have enough power to get there. [Edited on 02-03-2005 by Ian] [/quote]
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