TO_Vette

I was driving around today and for some reason I'm thinking that my rpm's are too high for the speed I'm going.

I don't have any clutch slip and everything is fine but it seems I'm running higher rpm's then I remember. But maybe it's always been like this and I'm losing my mind.

Anybody with a stock 81 with a 4 speed and 350 seeing the same rpm to speed?

• Speed Tech
• 61 4200
• 65 4400
• 70 4800
• 75 5200
• 77 5300

Thanks

CA-Legal-Vette

Can’t compare to my 73 auto but those RPMs do look awfully high.

Bikespace

Don't trust any of the OEM gauges. Use a digital timing light to check that your tachometer is reading correctly, and use a phone app to check your speed (I use SpeedOverlay).

Those numbers are about twice what they should be. Are you sure you're in 4th gear?

https://spicerparts.com/calculators/...rpm-calculator

Antz81

Those rpm are well out for the speeds you say. Follow the advice already given.

TO_Vette

Using a speedometer app on my phone I've confirmed that the speedometer is correct. So that leads me to believe the tachometer is wrong.

Is there a sensor that can be causing this and where is it located?