Tach Error

2290 Views 4 Replies 5 Participants Last post by miscreant, Jul 3, 2001

Deano

Discussion Starter · Mar 24, 2001

I recently picked up my Ody and after the break in period took a little business trip to San Diego to further break it in and check on wind noise etc. at higher speeds. While I am going to experiment with turning the cross bars around as suggested by Mario to see if that gets rid of the howling from them, the other detail I noticed was that at
a steady 70mph the tach read 2k rpm and at 80 it read 2300rpm. This seems awfully low since in my Acura integra the tach reads about 1k for each 20mph eg: 3k at 60mph and 4k at 8omph.
Do they have a really tall gear in the Ody or is my tach off or is there an explanation that anyone has for this.
Thanks, Deano

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huntlarry

· #3 · Jul 2, 2001

Just an FYI to you... You can not compare rpm from one car to another. The Integra 5th gear (I have an 88) is about an overall ratio of 1:1 which results in the rpm/mph figure you mentioned 3000 = 60 mph. Cars with larger engines and thus higher torque can get away with taller gearing (lower rpm). The Corvette with a 6 speed turns on 1800 rpm at 60 mph. If it could reach redline in 6th gear, it would be doing 300 mph. The 6th gear is so "tall" top speed is actually reached in 5th gear. In regard to "tach error", it is virtually impossible. The tach simply "counts" pulses from the ignition and thus cannot miss counts or add counts. It will, 99.99% of the time, work accurately or not at all.

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