my speed is off in my 2001 mustang gt

powerfulgt · October 27th, 2009, 05:36 PM

ok heres the deal i bought my car a yr ago and they told me there was a 373 gears in it so i bought the sct xcal went to my local speed shop and the speed is still off so we programed it for 410 and im still 7 mph off i no this because i have a speed deal by my house u know the ones the cops put out on the parking but anyway u think it has 355s in it i quess what im asking is how the hell can u tell or fix this my car is an automatic

HorsepoweR · October 27th, 2009, 07:10 PM

Do you have aftermarket gauges? Maybe they effed up the needle while changing them?

v606er · October 27th, 2009, 07:14 PM

Get a friend to drive beside you on the interstate and talk to him about what speed his odometer says, and compare it to yours.

powerfulgt · October 27th, 2009, 07:16 PM

yes but when i go pass the radar im 7mph off say my speed on the dash say 30 but radar says 23

takiller · October 27th, 2009, 07:19 PM

tire size along with gears...maybe a mix of both??

powerfulgt · October 27th, 2009, 07:20 PM

its all programed in sct xcal

v606er · October 27th, 2009, 09:12 PM

Originally Posted by powerfulgt

yes but when i go pass the radar im 7mph off say my speed on the dash say 30 but radar says 23

Maybe the radar thing is messed up *fingers crossed*

powerfulgt · October 27th, 2009, 10:35 PM

i dont know what up it drives like a race car plenty of power shifts good ill have go deeper in it ill get to the bottom of this some how all the help i can get will be helpfull

takiller · October 27th, 2009, 11:25 PM

Originally Posted by v606er

Maybe the radar thing is messed up *fingers crossed*

yea maybe the radar thing is messed up and not your car

police equipment is a little

sometimes

Boost4Me · October 28th, 2009, 12:35 AM

Take your roomies car through it and check the police speed checker. I'd think 1-2mph off max with those things.

Molitor · October 28th, 2009, 03:28 AM

have you tried a 4.30 gear tune?? you'd know if you had them im sure, but its also worth a shot

asiansensation78 · October 28th, 2009, 04:45 AM

+1 on having a friend drive next to you. I went past a radar at 35 one time and it read 47, so those things can definitely be a bit off.

powerfulgt · October 28th, 2009, 06:53 AM

ya i will try that thanks

YeloPony · November 5th, 2009, 04:29 PM

Originally Posted by powerfulgt

ok heres the deal i bought my car a yr ago and they told me there was a 373 gears in it so i bought the sct xcal went to my local speed shop and the speed is still off so we programed it for 410 and im still 7 mph off i no this because i have a speed deal by my house u know the ones the cops put out on the parking but anyway u think it has 355s in it i quess what im asking is how the hell can u tell or fix this my car is an automatic

I haven't done this,but I jacked mine up and found this... of course if your gears are not stock you'll need the tuner or a gear box.

1999-2004 Calibration Process

To find out your gear Ratio: (thanks to Rick @ CJ Pony)

"Calculating the gear ratio is pretty easy. Jack up the rear with both wheels off the ground. Rotate the tires 1 time and count the driveshaft revolutions. If the driveshaft turns a little of 4 times then you have 4.10 gears. If the driveshaft turns about 3.25 times then you have the stock 3.27 gears."

Goldenpony · November 15th, 2009, 03:24 PM

Check it against somebody's GPS thing

CobraVert69 · November 16th, 2009, 10:25 PM

+1 gps idea. that tells you your exact speed

AMNick · November 17th, 2009, 04:12 PM

+1 GPS...most of the police speed radar signs I see by me are all ridiculously off. I've compared my vehicle GPS, handheld GPS, speedometer are all almost dead-on with each other, so the signs are off. My guess is since they are not using them to pull people over, they are probably not calibrated frequently.

pyschopath76 · November 17th, 2009, 04:16 PM

+2 on the GPS. that is one of the most reliable things to do. if you dont have one, resort to the friend driving beside you. if you find its still off then you can work from there, but dont use those radar things to "guess" your speed. those things are f**ked from the get go

Ksmith7548 · November 20th, 2009, 12:28 AM

dude those radars are always fucked up, i have the same problem

HorsepoweR · November 20th, 2009, 12:37 AM

Yep, they set them so they say your going slower then you really are.. then you speed up thinking your speedo is off.. then they give you tickets

October 27th, 2009, 05:36 PM	#1
powerfulgt Regular 2001 mustang gt conv. Join Date: Oct 2009 Location: waukee Posts: 113 iTrader: 0 reviews	my speed is off in my 2001 mustang gt ok heres the deal i bought my car a yr ago and they told me there was a 373 gears in it so i bought the sct xcal went to my local speed shop and the speed is still off so we programed it for 410 and im still 7 mph off i no this because i have a speed deal by my house u know the ones the cops put out on the parking but anyway u think it has 355s in it i quess what im asking is how the hell can u tell or fix this my car is an automatic

October 27th, 2009, 07:10 PM	#2
HorsepoweR Enthusiast 99 SVT Cobra N/A Yet Join Date: Jul 2007 Location: McHenry, iLLinois Posts: 546 iTrader: 1 reviews	Do you have aftermarket gauges? Maybe they effed up the needle while changing them? __________________ Mods iN Garage.:.919 of 4040.:.Born on 3/29/99 Found On Road Dominating

October 27th, 2009, 07:19 PM	#5
takiller Hardcore Enthusiast 2003 Mustang GT 9.0 in the 8th Join Date: Aug 2007 Location: Texas Posts: 1,194 iTrader: 1 reviews	tire size along with gears...maybe a mix of both?? __________________ C&L CAI, 75 TB, Plenum, O/R H Pipe, SLP LM1's (Dumped), Eibach SS, Tokico S/S, Moser 31 Splines, Cobra Diff, FRPP 410's, XCal 3 93 Tune

October 28th, 2009, 12:35 AM	#10
Boost4Me Regular 99 Mustang GT Join Date: Dec 2008 Location: Panama City, FL Posts: 131 iTrader: 1 reviews	Take your roomies car through it and check the police speed checker. I'd think 1-2mph off max with those things. __________________ Stroked and Blown

October 28th, 2009, 03:28 AM	#11
Molitor Enthusiast 2004 Mustang Mach 1 1994 Dodge Ram 5.9L 4WD 1976 Monte Carlo Join Date: Oct 2008 Location: Winona, Minnesota Posts: 805 Blog Entries: 1 iTrader: 0 reviews	have you tried a 4.30 gear tune?? you'd know if you had them im sure, but its also worth a shot __________________ Military Crew MM Sapper Squad Zombie Killing Club Member #4 Black Stang Crew Member #5

October 27th, 2009, 07:16 PM	#4
powerfulgt Regular 2001 mustang gt conv. Join Date: Oct 2009 Location: waukee Posts: 113 iTrader: 0 reviews	yes but when i go pass the radar im 7mph off say my speed on the dash say 30 but radar says 23

October 27th, 2009, 07:20 PM	#6
powerfulgt Regular 2001 mustang gt conv. Join Date: Oct 2009 Location: waukee Posts: 113 iTrader: 0 reviews	its all programed in sct xcal

October 27th, 2009, 10:35 PM	#8
powerfulgt Regular 2001 mustang gt conv. Join Date: Oct 2009 Location: waukee Posts: 113 iTrader: 0 reviews	i dont know what up it drives like a race car plenty of power shifts good ill have go deeper in it ill get to the bottom of this some how all the help i can get will be helpfull

October 28th, 2009, 04:45 AM	#12
asiansensation78 Too Soon, Junior! 03 GT Vert 15:43.28@25.21 Too many naked bitches in the back Join Date: Jul 2009 Location: Columbus, OH Posts: 3,694 iTrader: 4 reviews	+1 on having a friend drive next to you. I went past a radar at 35 one time and it read 47, so those things can definitely be a bit off. __________________ 03 GT - Scrapes on lane markers - Modded 02 Cougar - Able to clear most speed bumps - Some mods 01 Explorer - Parking blocks NOM NOM NOM - Stock

October 28th, 2009, 06:53 AM	#13
powerfulgt Regular 2001 mustang gt conv. Join Date: Oct 2009 Location: waukee Posts: 113 iTrader: 0 reviews	ya i will try that thanks

November 15th, 2009, 03:24 PM	#15
Goldenpony Regular Join Date: Oct 2006 Posts: 268 iTrader: 0 reviews	Check it against somebody's GPS thing __________________ 2006 GT 'Vert Screaming Yellow, Black leather 5 Spd MGW Shifter Brenspeed 93 Octane tune CORSA Performance Exhaust Retro-Solutions HIDs

November 16th, 2009, 10:25 PM	#16
CobraVert69 Newbie 1999 Mustang Cobra n/a Join Date: May 2009 Location: MI Posts: 17 iTrader: 0 reviews	+1 gps idea. that tells you your exact speed __________________ what seems to be the officer problem?

November 17th, 2009, 04:12 PM	#17
AMNick Authorized Vendor 1993 Mustang GT Join Date: Nov 2006 Location: Malvern, PA Posts: 546 iTrader: 0 reviews	+1 GPS...most of the police speed radar signs I see by me are all ridiculously off. I've compared my vehicle GPS, handheld GPS, speedometer are all almost dead-on with each other, so the signs are off. My guess is since they are not using them to pull people over, they are probably not calibrated frequently. __________________ AMNick Ex-Forums Liaison AmericanMuscle.com PM AMStanger - AM's New Forums Liaison with all questions and discount inquiries!

November 17th, 2009, 04:16 PM	#18
pyschopath76 Enthusiast 2004 Mustang GT slow as sin.... Join Date: Aug 2009 Location: Norfolk, VA Posts: 977 iTrader: 0 reviews	+2 on the GPS. that is one of the most reliable things to do. if you dont have one, resort to the friend driving beside you. if you find its still off then you can work from there, but dont use those radar things to "guess" your speed. those things are f**ked from the get go __________________ JLT Ram Air Intake/Accufab 70mm Throttle Body & Upper Plenum/SLP Longtube Headers/SLP Catted X-pipe/SLP LM1/4.10 gears Military Crew - AZ2(AW) Black Stang Member #6

November 20th, 2009, 12:28 AM	#19
Ksmith7548 Newbie 2000 mustang gt unknown Join Date: Sep 2009 Location: Castine Posts: 34 iTrader: 0 reviews	dude those radars are always fucked up, i have the same problem

November 20th, 2009, 12:37 AM	#20
HorsepoweR Enthusiast 99 SVT Cobra N/A Yet Join Date: Jul 2007 Location: McHenry, iLLinois Posts: 546 iTrader: 1 reviews	Yep, they set them so they say your going slower then you really are.. then you speed up thinking your speedo is off.. then they give you tickets __________________ Mods iN Garage.:.919 of 4040.:.Born on 3/29/99 Found On Road Dominating

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