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Fry Rice Specialist
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4,794 Posts
Discussion Starter #1
just trying to figure the setting i need to make the speedo correct.

car is equipped with 3.73 gear and at what supposed mph the engine rpm is at

1500

2000

2500

now the speedcal set and i still think it's little bit off but i didn't know how much i'm off. at 2000 rpm the speedo is at 60mph now.

thanks for the help.
 

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Premium Member
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2,546 Posts
Thats about right Casper. My GPS shows me at 60MPH at just a HAIR over 2K. I'm running 245/45 R18's so. I think you got it prett close. I think I'm doing 73 at 2500 but I could be wrong. You'll have to wait for someone else to chime in cuz I'm in the Middle East and the car is in storage.
 

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It also depends on what tire size you are running. You need to get a reading with someone running the same size tire as you are. The tachs in our cars is also not that accurate, but maybe they are all about the same.
If you can find someone with a GPS and take them for a ride in your car might be the best way to get the reading.
 

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Fry Rice Specialist
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4,794 Posts
Discussion Starter #4
check again at 2500 rpm the speedo is showing 73-74 mph. how close is it?
 

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483 Posts
thats about right...i'm running around 2400 at 70 mph, 2700 at 80 mph. give or take 300rpm for every 10 mph.
i have 245 45/18 tires
 

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i wish, at 2000 rpm, i'm going 65mph. and i'm pretty sure no 3.73 gears in the back, because if there was, the cougar would move a little faster
 
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