Rpms

Mustang RacR94 · November 23rd, 2007, 05:45 PM

just thought id give a check to make sure i have stock gears in my car, so i dont waste my time buying them, in fifth gear 80 MPH what RPMs should my car be at, i have a 03 mach 1 5 speed, i beleive they come stock with 3 55s

TheBusher · November 23rd, 2007, 05:57 PM

what size tires do you have?

cliffyk · November 23rd, 2007, 06:29 PM

With the stock tires and stock 3.55 gears you should be turning around 2300-2350 rpm at 80 mph.

Here's a link to my speed/gears calculator...

TheBusher · November 23rd, 2007, 06:31 PM

Originally Posted by cliffyk

With the stock tires and stock 3.55 gears you should be turning around 2300-2350 rpm at 80 mph.

Here's a link to my speed/gears calculator...

2,304

04GTAMPA · November 23rd, 2007, 06:44 PM

someone made a real nice thread on this. It should be a freaking sticky!

TheBusher · November 23rd, 2007, 06:59 PM

Originally Posted by 04GTAMPA

someone made a real nice thread on this. It should be a freaking sticky!

that was me

i'll go find it

TheBusher · November 23rd, 2007, 07:34 PM

Originally Posted by 04GTAMPA

someone made a real nice thread on this. It should be a freaking sticky!

here you go...

3.55's vs 3.73's vs 4.10's for 03-04 Mach 1

Eagle2000GT · November 23rd, 2007, 08:35 PM

You can't check it by speedometer versus tachometer unless your car has had the computer recalibrated for your setup.

The best way to check gears is to jack up the back of the car. Put the car in neutral. Place a mark on the driveshaft and one tire. As you turn the tire, count the number of time the driveshaft goes around. For example, if the driveshaft turns 3 1/4 times for one full turn of the wheel then you have 3.27 gears. It it turns, just over four time then you have 4.10s. Just under is 3.73s. If you have 3.55s then the driveshaft should go around 3 1/2 times for one full rotation of the tire.

HMUSN · November 23rd, 2007, 08:36 PM

or drive with a GPS on. that will tell you your true speed

TheBusher · November 23rd, 2007, 10:14 PM

Originally Posted by HMUSN

or drive with a GPS on. that will tell you your true speed

Shut up you with your new cheap-ass-black-friday-sale-I-woke-up-at-four-am-because-I-have-nothing-better-to-do-Garmin GPS system

j/k you know I love you and your infinite mustang wisdom

November 23rd, 2007, 05:45 PM	#1
Mustang RacR94 MM Fanatic 99 cobra N/A Join Date: Dec 2006 Location: Fayetteville NC Posts: 3,170 iTrader: 0 reviews	Rpms just thought id give a check to make sure i have stock gears in my car, so i dont waste my time buying them, in fifth gear 80 MPH what RPMs should my car be at, i have a 03 mach 1 5 speed, i beleive they come stock with 3 55s __________________ 99 Cobra 03 Cobra motor AFCO H/E Pulley JLT CAI BBK L/T off road H/steeda catback SCT MAF Tune 03 cobra pumps HVGC

November 23rd, 2007, 06:29 PM	#3
cliffyk Hardcore Enthusiast Join Date: Feb 2007 Location: Saint Augustine, FL Posts: 1,807 iTrader: 1 reviews	With the stock tires and stock 3.55 gears you should be turning around 2300-2350 rpm at 80 mph. Here's a link to my speed/gears calculator... __________________ -cliff knight- My Mustang 2003 GT, UPR X, 24lb/h injectors, Magnaflow, 180° stat, PP 70mm TB & plenum, DF Commando, Steeda UDPs, Ralco RZ_flywheel, RAM HDX clutch, WX EFX COPs 3.73s, 262 rwHP/305 lb-ft. Flex-fuel: burns gas and rubber...

November 23rd, 2007, 06:44 PM	#5
04GTAMPA Hardcore Enthusiast 2001 Mustang SVT Cobra Join Date: Apr 2007 Location: Riverview, FL Posts: 2,742 iTrader: 1 reviews	someone made a real nice thread on this. It should be a freaking sticky! __________________ Slow, really slow Cobra. Wanna see? MM Cobra Club Member #81 "TAMPA BAY AREA CREW"

November 23rd, 2007, 08:35 PM	#8
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	You can't check it by speedometer versus tachometer unless your car has had the computer recalibrated for your setup. The best way to check gears is to jack up the back of the car. Put the car in neutral. Place a mark on the driveshaft and one tire. As you turn the tire, count the number of time the driveshaft goes around. For example, if the driveshaft turns 3 1/4 times for one full turn of the wheel then you have 3.27 gears. It it turns, just over four time then you have 4.10s. Just under is 3.73s. If you have 3.55s then the driveshaft should go around 3 1/2 times for one full rotation of the tire. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

November 23rd, 2007, 08:36 PM	#9
HMUSN Doc 1986 SVO 48.47@ 12.58 Join Date: Nov 2006 Posts: 37,050 iTrader: 11 reviews	or drive with a GPS on. that will tell you your true speed __________________

November 23rd, 2007, 05:57 PM	#2
TheBusher Hardcore Enthusiast 2002 Chevrolet Impala ??? Join Date: Jul 2007 Location: Fort Collins, Colorado Posts: 2,241 iTrader: 0 reviews	what size tires do you have?

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