mysticclam
Typo King
- Joined
- April 2, 2004
- Messages
- 210
- Reaction score
- 0
- City, State
- Tacoma, WA
- Year, Model & Trim Level
- 91 XLT
my 91 explorer has 4.56 gears and 33inch tires. Every calculator or chart ive come across says 5th gear 60 mph should be about 2200 rpm. My tach reads 2850ish seems really high. Engine kind of sound like 2850ish though
I have checked the speed with GPS as my speedo is off (it is off the right amount, when gps says 60, speedo reads 69 which is just the right amount off.
Tach on a 91 is pretty basic right? my gear and tire swap shouldnt have affected it at all. I cant remember if it seemed high before, it was a long time ago.
I was wondering if there was a switch or something for 4 cyl engines (same dash used in 4 cyl rangers) they had 8 plug heads, divide my rpm by 8 and multiply by 6 and you get pretty close to the expected 2200 rpm. Any way to check if I have a 4cyl tach or if you can switch it?
I have checked the speed with GPS as my speedo is off (it is off the right amount, when gps says 60, speedo reads 69 which is just the right amount off.
Tach on a 91 is pretty basic right? my gear and tire swap shouldnt have affected it at all. I cant remember if it seemed high before, it was a long time ago.
I was wondering if there was a switch or something for 4 cyl engines (same dash used in 4 cyl rangers) they had 8 plug heads, divide my rpm by 8 and multiply by 6 and you get pretty close to the expected 2200 rpm. Any way to check if I have a 4cyl tach or if you can switch it?