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SnyperBob · 02-03-2006, 12:46 AM

Quote: Originally Posted by djmickyg

this aint right..
at 4000rpm in 2nd gear ur car is always going to do the same speed regardless of a hill or decline..

Quote: Originally Posted by gameboy

if you shift by speed u r going to fubar your tranny

example, going up a hill in second gear you might be at 4,000 rpm but only going 20 mph

where on flat road in second gear going 20 mph, you might be at 1500 rpm.

Wow - you must not own a manual trans vehicle...

My car (97 Ford Aspire) doesn't have a tachometer. In the manual that came with the car they say to base your shift points off the speed of the vehicle. Yes, this may not be the most ideal point to shift along the RPM curve, but it works without problems. Besides, most newer cars have regulators that don't allow you to blow the engine if you don't shift or miss a shift. (Rev limiter)

Like someone else brought up - the only issue you would have is the lag between the GPS readouts and the time it actually shows up in your carputer. You could possibly build in some sort of compensation to make up for the lag, but even then it would be mediocre at best.

I think it would save more time and be worth the money to just go out and buy an actual tachometer that can handle what you want. More reliable, built for the purpose, and they are usually as big as a carputer screen for easy readability.

02-03-2006, 12:46 AM	#9
SnyperBob FLAC Join Date: Nov 2001 Location: Illinois Posts: 1,167	Quote: Originally Posted by djmickyg this aint right.. at 4000rpm in 2nd gear ur car is always going to do the same speed regardless of a hill or decline.. Quote: Originally Posted by gameboy if you shift by speed u r going to fubar your tranny example, going up a hill in second gear you might be at 4,000 rpm but only going 20 mph where on flat road in second gear going 20 mph, you might be at 1500 rpm. Wow - you must not own a manual trans vehicle... My car (97 Ford Aspire) doesn't have a tachometer. In the manual that came with the car they say to base your shift points off the speed of the vehicle. Yes, this may not be the most ideal point to shift along the RPM curve, but it works without problems. Besides, most newer cars have regulators that don't allow you to blow the engine if you don't shift or miss a shift. (Rev limiter) Like someone else brought up - the only issue you would have is the lag between the GPS readouts and the time it actually shows up in your carputer. You could possibly build in some sort of compensation to make up for the lag, but even then it would be mediocre at best. I think it would save more time and be worth the money to just go out and buy an actual tachometer that can handle what you want. More reliable, built for the purpose, and they are usually as big as a carputer screen for easy readability. __________________ www.mobile-effects.com Free file hosting, picture gallery hosting for installs, PM me. Internet's first Front End Skin browser, featured installs, downloads, links, informative articles - all free to registered users.