Tach is really off.....
01-06-2005, 06:09 PM
#1
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Car: 1992 Camaro RS
Engine: Yet another 350 TPI
Transmission: Borg Warner 6 spd
Axle/Gears: 3.73
Tach is really off.....
Comparing the tach in the car to the rpms that the ecm is reporting via ALDL, one or the other is VERY off. Idling at 750-800 rpm, my tach shows about 1100 or 1200 rpm. At 2000 rpm, the tach reads 2600. I am assuming the ecm figure is correct, and the tach is wrong. Is there any way to adjust or modify the tachometer so that it reads correctly?
01-06-2005, 06:15 PM
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Car: 1987 Camaro SC
Engine: 2.8L MPFI (rebuilt)
Transmission: 700R4 swapped to T5
Axle/Gears: 3.42 open
Check this thread, same problem fixed.
https://www.thirdgen.org/techbb2/sho...hreadid=272845
Tachs fail all the time on our cars, and always fail by reading higher.
https://www.thirdgen.org/techbb2/sho...ight=tach+high
https://www.thirdgen.org/techbb2/sho...hreadid=272845
Tachs fail all the time on our cars, and always fail by reading higher.
https://www.thirdgen.org/techbb2/sho...ight=tach+high
Last edited by bru333; 01-06-2005 at 06:20 PM.
01-07-2005, 09:43 PM
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Car: 1992 Camaro RS
Engine: Yet another 350 TPI
Transmission: Borg Warner 6 spd
Axle/Gears: 3.73
Is there a way to adjust it or compensate for the difference. In other words, fixing it so it reads correctly. Once I get the car dialed in, I don't want to be guessing as to when I need to shift. I also don't want to install an aftermarket tach in the car. I think it looks out of place.
01-08-2005, 01:16 AM
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Car: '83 Z28, '07 Charger SRT8
Engine: 454ci, 6.1 Hemi
Transmission: TH350, A5
Axle/Gears: 2.73 posi, 3.06 posi
If you have a manual trans, just shift when it stops pulling... thats when you wanna shift anyway.
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