Mustang Forums - View Single Post - How To: Calculate RPM for your Gear Ratio

NoKturnaL · 02-07-2005, 04:27 PM

OK..now I am confused!
I was jotting in some numbers to determine what miles per hour I am going while in a curtain gear at a curtain RPM.

First I put in that I was at 5000 RPM in 3rd gear WITH the stock 3.27..and It calculated that I would be going 88MPH's.

Then I put in all the SAME numbers..only with 3.73 gears and it said I would only be going 77MPH's

Then I again put in all the same number as that But with 4.10 Gears And I was going slower at 70MPH's..

now......does that mean the stock 3.27 is the better gear???? cause I am going faster at curtain miles per hour's with 3.27 rather than the 3.73 and 4.10's...

WHats going on here?
SHOULDNT I BE GOING FASTER WITH THE 3.73 OR 4.10's???????? or is the forrmula all messed up????

02-07-2005, 04:27 PM	#4 (permalink)
NoKturnaL MustangTuning 5-oh Join Date: Dec 2004 Location: Peabody, MA Posts: 1,950	OK..now I am confused! I was jotting in some numbers to determine what miles per hour I am going while in a curtain gear at a curtain RPM. First I put in that I was at 5000 RPM in 3rd gear WITH the stock 3.27..and It calculated that I would be going 88MPH's. Then I put in all the SAME numbers..only with 3.73 gears and it said I would only be going 77MPH's Then I again put in all the same number as that But with 4.10 Gears And I was going slower at 70MPH's.. now......does that mean the stock 3.27 is the better gear???? cause I am going faster at curtain miles per hour's with 3.27 rather than the 3.73 and 4.10's... WHats going on here? SHOULDNT I BE GOING FASTER WITH THE 3.73 OR 4.10's???????? or is the forrmula all messed up???? __________________ 2002 Mustang GT Coupe 5-Speed Performance K&N Intake Accufab upper Intake Plenum Accufab 70mm Throttle Body Steeda Pullies SCT 4-Bank Chip Dyno Tuned Mac H-pipe Flowmaster Cat-Back Steeda Shifter Centerforce Clutch SLP-Line-Lock And more upgrades visually