RPM question - Ford Powerstroke Diesel Forum
 
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post #1 of 10 Old 11-02-2007, 03:45 PM Thread Starter
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RPM question

Would anyone with a similar setup to what I have chime in and tell me how many RPM's your turning at 70 mph, and what gears you have.

Should there be a tag on the rear end(not one on mind), trying to figure out if someone changed the gears.

Thanks in advance

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post #2 of 10 Old 11-02-2007, 03:48 PM
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im runnin 38's and at 70 im runnin around 1750 rpms. now my speedo says 60mph but my gps tells me im at 70. this is with 3.73 gears. not sure but you probably have same gears.

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post #3 of 10 Old 11-02-2007, 03:54 PM
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I have 35's and 3.73 gears. When I'm at 70 MPH the tach is at 2,000 RPM's exactly

Early 99 F-350
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post #4 of 10 Old 11-02-2007, 04:03 PM Thread Starter
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I ment to put this too! I think my speedo is off 8 mph and at 62 I'm running 2200 RPM's. Seemed kinda high to me, but not sure?

White 06 F-350 Lariat
Limo Tint
Smoked Recon cab lights, rear brake lights
and turn signals
Leveling Kit
37"x13.5" Toyo M/T's
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edge insight w/ EGT probe
Magnaflow 4" stainless exhaust turboback
SCT X3 with Innovative custom tunes
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post #5 of 10 Old 11-02-2007, 04:10 PM
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wow that does sound high. maybe you have 4.30 gears.

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post #6 of 10 Old 11-02-2007, 04:14 PM
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Oh another thing, I often drive by those police speed trap radar signs and the police sign says the exact speed that my speedo says, my speedometer is exactly correct.

Early 99 F-350
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-BTS Tranny
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post #7 of 10 Old 11-02-2007, 04:27 PM
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it is is off by 8mph and you're going 70 at 2200rpms, i'd guess you have 4.56 or 4.88 gears. thats what these calculators are telling me
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post #8 of 10 Old 11-03-2007, 08:26 AM Thread Starter
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Thanks for the help! When I was looking for a tag on the rear end I noticed a small leak, so it looks like I'll be finding out whats in there the hard way.

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edge insight w/ EGT probe
Magnaflow 4" stainless exhaust turboback
SCT X3 with Innovative custom tunes
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post #9 of 10 Old 11-03-2007, 08:31 AM
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4spd auto with 4.10's. 65mph at 2000 rpm

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post #10 of 10 Old 11-03-2007, 08:36 AM
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I'm running at 80mph right now. and im turning 2300 qith 3.73

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