Do electric tachs get lazy?
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From: Balfour
Do electric tachs get lazy?
Lately my tach hasn't gone past 2200rpm and as I
figure it I'm goin 54mph at 2000rpm with 3.54's and 33" tires.
My gut says I'm goin way over 50 at 2000rpm,my speedo doesn't work but I know when I'm hauling
I s my tach worn out?
Its made in china and I bought it from walmart....ughhh
figure it I'm goin 54mph at 2000rpm with 3.54's and 33" tires.
My gut says I'm goin way over 50 at 2000rpm,my speedo doesn't work but I know when I'm hauling
I s my tach worn out?Its made in china and I bought it from walmart....ughhh
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Joined: Aug 2001
Posts: 211
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From: Houston, Tx
Do electric tachs get lazy?
Sounds like your tachs OK.
That "high" (numerically-lower) gear ratio and tall tires would surely make your engine turn low RPM's.
Your Math is a little off, so heres some figures to help you.
Note: These figures are specifically for your truck with the infomation you gave, 33" tires, 3.54 rear gears. You'll notice these are the most common speed limits.
30-MPH = 1,081-RPM
45-MPH = 1,621-RPM
55-MPH = 1,982-RPM
60-MPH = 2,162-RPM
70-MPH = 2,523-RPM
That "high" (numerically-lower) gear ratio and tall tires would surely make your engine turn low RPM's.
Your Math is a little off, so heres some figures to help you.
Note: These figures are specifically for your truck with the infomation you gave, 33" tires, 3.54 rear gears. You'll notice these are the most common speed limits.
30-MPH = 1,081-RPM
45-MPH = 1,621-RPM
55-MPH = 1,982-RPM
60-MPH = 2,162-RPM
70-MPH = 2,523-RPM
Thread Starter
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Senior User
Joined: Jan 2003
Posts: 451
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From: Balfour
Do electric tachs get lazy?
it goes past 2200, but usually I'd be at 1800 rpm or so
goin into town to keep up with traffic and lately it has
only been around 1200-1500rpm tops. kinda weird.
is the magneto thing getting weak?
goin into town to keep up with traffic and lately it has
only been around 1200-1500rpm tops. kinda weird.
is the magneto thing getting weak?
