DM speedcal settings

[DeadPedal]

I've been having a heck of a time getting my speedo right in this car and i'm nearly fed up. it's a 98 GT 5spd 4.10 gears.

http://i133.photobucket.com/albums/q47/deadpedal/DSCF1469_2Medium.jpg

i guess this is an extended range model, i asked the guy on the phone, and i guess this is the only one they sell now. he also told me to take the setting from thier online calcuator and move them to the right 2 place, which gave me my current settings:
1000000 for the top set
0010100000 bottom

however, i paced another car, and when they said we were doing 40, my speedo said 47.

sorry for the novel, but if anyone has this setup (i'm assuming its fairly common) and you know it to be right, please let me know how you have yours set. thanks guys!!!

[98_2vgt]

ahhh.... memories....

Edit: After reading your post again, I'm not sure why you're offsetting the numbers to the right by 2 places? Even the example on the DM website shows the numbers starting at the left with a 1 and going right from there with no leading zero's. Start by using the number from the calculator and enter it straight in.


Better bet is to measure mileage. Who knows where the other cars speedo is at? Do 10 miles on the tollway and then use the corrections. I just had to go check my notes. For mine with 245/45/17's I first tried 1010000010 and the reading was 11.5 miles in a measured 10 mile stretch. I then used the correction for 245/40/17 (slightly smaller diameter) and that got it closer.
One of the members on here is the designer of the SpeedCal and at the time, he suggested 1011100010 as a correction. I couldn't tell you where it's at right now as I haven't opened the speedcal since 2005.

Also, if you should experience a drop out of the speedo, he told me there was an alternate setting for bank 2 of 0100000 which increases the output of the speed cal, but this shouldn't be necessary unless you see drop out on the speedo.

Hope that helps.

Chris

[TangerineBossGT]

The calculator has always been dead on for me and there are only 5 different pieces of information you need, so my assumption is that you are using a wrong number.

Was the speedo gear changed during the gearswap? Could your GT have possibly had a upgraded gearset to start with? I don't know if it were an option on the GTs or not, but the 98 Cobra I had came with 3.27s stock (upgraded) versus 2.73s or possibly even 3.08s whichever was "stock" at that time. I don't know off hand all the available options and such, but I do know that through the years, all these gearsets were offered. Also, look in the glove compartment and use the tire size given there for stock, as Ford tends to use little scrawny tires, relative to what everyone would prefer.

Scott

[GreenOOGt]

on a 98 couldn't you just change the gear?

Shawn

[TangerineBossGT]

on a 98 couldn't you just change the gear?

Shawn

For just a gear change yes, but that won't account for rim/tire changes.

Scott

[xomp]

a little OT, i have one like this, is it always 1000000 on the top one? i got a used one w/o instructions.

[98_2vgt]

You can correct with gears up to a point. I'll qualify this and say that I'm doing it from memory. If I make a mistake, I'm sure someone will correct me.
IIRC, the drive gear in a GT (non-Cobra) T45 has 8 teeth. The closest correction for a change to a 4.10 gear is the 23 tooth driven gear. The problem is that first, they don't necessarily mesh very well and the driven gear will sometimes wear quickly. And that correction, while close, isn't perfect as that's also the recommended driven gear for 3.73's. Also as TangerineBossGT mentioned above, the gear alone can't handle tire/rim size changes.

Chris.

[98GTStangconv]

I have the same problem my speedo is about 5 mph faster the whole time. I would like to change mine because I know im gaining more miles than I really am. I think Im just going to have to play with the numbers. Mine also Jumps when I take off, its starts to go up then when it hits 20 it drops to around14mph then starts climbing again.

[98_2vgt]

a little OT, i have one like this, is it always 1000000 on the top one? i got a used one w/o instructions.

And this should fix that...

Mustang Parts Online Restoration and Performance Superstore (http://www.dallasmustang.com/page/speedcal.inst.php)

Chris

[DeadPedal]

well, i had been working off some bad information that all GT's came with a 3.27 gear factory, which is apparently not the case. this is what i was basing my speedcal setting off of.

it seems my car had a 2.73, so i'm going to try some new settings later today.

[xomp]

And this should fix that...

Mustang Parts Online Restoration and Performance Superstore (http://www.dallasmustang.com/page/speedcal.inst.php)

Chris

yea, but i mean in his picture, theres another set of dip switches on the top one. i dont know how to adjust those? (where there are 1-7 instead of 1-10 switches) unless i missed something on the site.

[reivaxtorres]

You can correct with gears up to a point. I'll qualify this and say that I'm doing it from memory. If I make a mistake, I'm sure someone will correct me.
IIRC, the drive gear in a GT (non-Cobra) T45 has 8 teeth. The closest correction for a change to a 4.10 gear is the 23 tooth driven gear. The problem is that first, they don't necessarily mesh very well and the driven gear will sometimes wear quickly. And that correction, while close, isn't perfect as that's also the recommended driven gear for 3.73's. Also as TangerineBossGT mentioned above, the gear alone can't handle tire/rim size changes.

Chris.

whats the difference between the gt t-45 and the cobra t-45 speedo gears? i have a 98 gt with 3.55 gears and a cobra t-45, when i did the swap i was given a speedo gear for the 3.55s and was told it was for the cobra t45...just wanted to make sure because mine might be a few mph off.

[xomp]

anyone know about the top switches?

[TangerineBossGT]

anyone know about the top switches?

I have never read anything about adjusting those at all. For the speedo corrections for gears, rims/tires, etc. you use the set of 10.

Scott

[D2Fresh16]

Im having the same problem, but mine is actually slower... My car came with 225/55R16, i now have 295/35 R18, and secondly my gears went from a 2.73 to a 4.10... The only thing i didn't type into the calculator was the amount of teeth on the gear, simply because i have no idea. I think this is our problem, because everything else seems to be right, and i think the speedometer gear number not being accurate could throw it off a little. Does anyone know how many teeth there are on a stock 97 GT? Thanks

Doug

[MeanGreen96]

My '96 3.27 had 19 teeth (tan gear). Maybe 18 teeth (gray gear) for a 2.73?

[FryRice]

Doesnt it tell you your gear ratio on one of the door stickers or somethin ?

[FryRice]

I installed my Speed Cal,and now my speedo doesn't work at all.:Cry:

I know I wired the thing right.And I only messed with the dip switches assuming my car came with 3.27 gears. I switched to 4.10s

[nyuk98gt]

Doesnt it tell you your gear ratio on one of the door stickers or somethin ?

FryRice:

There is a tag on the differential when the car comes from the factory and "I think" that the VIN will say what gears the car was built with. I know the tag is the first thing to go when new gears are installed ....

Open up the S/C and see if the red LED is on. It will tell you whether the unit has power. The blue clip electrical connector may not have pierced the insulation and the S/C may not have power. Also, check the fuse of the wire that you tapped into because it may have popped. Dallas Mustang has a S/C forum on their site that might have a FAQ and useful threads.

Geez, this is the last thing before you're PI-ed 97 is near perfect! Get movin', Truss! :cheers:

HTH,

Chris

[FryRice]

FryRice:

There is a tag on the differential when the car comes from the factory and "I think" that the VIN will say what gears the car was built with. I know the tag is the first thing to go when new gears are installed ....

Open up the S/C and see if the red LED is on. It will tell you whether the unit has power. The blue clip electrical connector may not have pierced the insulation and the S/C may not have power. Also, check the fuse of the wire that you tapped into because it may have popped. Dallas Mustang has a S/C forum on their site that might have a FAQ and useful threads.

Geez, this is the last thing before you're PI-ed 97 is near perfect! Get movin', Truss! :cheers:

HTH,

Chris

What would I do without you buddy ?:cheers:

Ok enough gayness, lmao. Um yeah,I noticed that my stereo has no sound now ,so I bet your right on about the fuse. Im sure they are the same one. You happen to know which fuse ? I dont have a owners manual ,I need to get a service manual though.

Im gonna check that tomorrow. Actually my swap wont be complete quite yet. I went to start her today and she almost didnt turn over. Im thinkin the starter is wore out and underpowered for this new application. Like my tranny to.

BTW ,I took a couple people for a ride and showed them what she could do now,lol. Lets just say my passenger side door panel has finger nail marks in it.:headbang:

[MustangMatt96GT]

Well I have noticed that if I put my dipswitches to set like this it gets me somewhere close. I put the 1s down and the 0s up. I am going to be messing with mine tommarow, because I just havent had the time. At 30 its correct, but at 45 it reads 40 and at 60 it reads 53. Fryrice check to see if its just the power. I couldnt get my blue clip to work, so I just spliced into the wire normal. Also the top dipswitchs are not to be moved. Fryrice if you PM me on MM I wil help you the best I can! You can PM me here, but it may take longer for me to respond!

[FryRice]

Well I have noticed that if I put my dipswitches to set like this it gets me somewhere close. I put the 1s down and the 0s up. I am going to be messing with mine tommarow, because I just havent had the time. At 30 its correct, but at 45 it reads 40 and at 60 it reads 53. Fryrice check to see if its just the power. I couldnt get my blue clip to work, so I just spliced into the wire normal. Also the top dipswitchs are not to be moved. Fryrice if you PM me on MM I wil help you the best I can! You can PM me here, but it may take longer for me to respond!

Thanks bud. I probably popped a fuse cuz the sound to my stereo doesn't work,lol. Didnt have time to mess with it today. Everything went smoothly with the wiring so I should be good there. Ill let ya know.

[98_2vgt]

My '98 speedo was intermittent after installing the speed-cal. What's interesting is that if you data log, you'll still see that the ECM is still getting a speed signal, just not the speedometer. If you have no signal at all you'll set a VSS failure code. I'll go check my PM's and post again.

EDIT:

1) The VSS Failure Code is P500 If there is no output from the speedcal, this code will be set.

2) The bank of 7 switches at the top is an alternate output range and does not effect calibration. The original setting from DM for this bank is 0100000 and normally, that setting works just fine. According to my notes, (From the designer) the alternate setting is 1000000. This increases the output signal from the speed cal. (Not the miles per hour, just the signal strength) Again, MPH is corrected in Bank 1.
The ECM and the Speedo up until 1998 are wired in parallel on these cars so it's possible that the ECM can see a speed input while the speedometer will not work. A total failure would set the P500 code mentioned above. Initially, my speedometer did not work. Changing to the alternate setting on the Bank 2 set of switches fixed that problem for me.
While externally, the tail shaft lengths are different, the only internal difference between the Cobra T-45 and the GT T45 that I am aware of is the number of gears on the speedo drive gear. That's why some gear changes on a Cobra can be corrected with a chage of the driven gear on the speedo cable while the GT requires a speedcal.

Hope that helps.

Chris

[xomp]

nice info! thanks!!

[FryRice]

I checked all fuses and none were blown. I tested them and visually inspected them. My speedo and radio still dont work.

[MustangMatt96GT]

Make sure then nothing is shorting out. If you can take a picture of the way its set up and I will do my best to help you. Take pictures of the power connection and everything. Also best thing to do is to drivearound, and see if the red light goes on!

[FryRice]

I got everything bolted up right now Matt. Im gonna investigate tomorrow. I dont even remember seein a light on it,but Ill have to look again.

[98_2vgt]

The led light on the board of the speedcal should come on when the vehicle is in motion. That indicates that the speedcal is getting an input from the VSS. Truss, is your car setting a code? Can you datalog to see if the ECM is seeing a speed reference? I'm guessing, but when you say the radio and the speedo aren't working, does that mean you wired your speedcal into the radio power? Not that it matters much, 12V is 12V. I wired mine to the cigarette lighter. If there's no power at your source there can only a few different reasons. Blown fuse, and a disconnected or broken wire being the two most likely. (After confirming that the wire you connected to is actually a hot wire.) Obviously a dead short would blow a fuse.

Chris

[FryRice]

I haven't checked for any codes yet. Ive been trying to get the datalog going ,but I dont have a laptop. Your supposed to be able to do it without a laptop and SCT gives you directions on it. But when I attempt to do the "capture data" and hit cancel on the handheld ,its not loading anything onto my PC into LiveLink.

I wired the Speed Cal into my lighter also. The instructions said to connect it to the blue/white wire with the scotch lok.

Im goin back out to check everything,Ill report back.:)

[FryRice]

Trouble code : It only showed one.


I pulled it with my XCT2.

P1270

RPM/VSS Limit Reached

[98_2vgt]

I have no idea what that code is, but it sounds like it's in the family. Probably a good idea to go back to stock and confirm that the VSS is working. (Assuming you can't datalog it) This will also give you a chance to confirm all the wiring. I'm just guessing from the the code description, but it sounds like you may have reached the upper end of the signal range (read that as a high voltage making it to the ECM) which might indicate something isn't wired correctly.

Good luck,

Chris

EDIT:

Found this with a search.

P1270 - Engine RPM

Indicates the vehicle : * Wheel slippage : The DTC indicates the :
has been operated in a : (water, ice, mud : vehicle has been :
manner which caused : and snow) : operated in a manner :
the engine or vehicle : * Excessive engine : which caused the :
to exceed a : rpm in Neutral : engine or vehicle :
calibration limit. The : * Vehicle drive at a : speed to exceed a :
engine rpm and vehicle : high rate of speed : calibrated limit. :
speed are continuously :
monitored by the PCM. :
The DTC is set when :
the rpm or speed fall :
out of calibrated :
range. For additional :
information on the :
engine rpm/vehicle :
speed limiter, refer :
to Section 1, :
Electronic Engine :
Control (EC) System, :
Powertrain Control :
Software. :

[FryRice]

Wow ,where did you find that ? I searched all over the net ,and the only thing I could find was the code itself with no description.That tells me a ton.:cheers:

I disconnected the negative battery cable for 30 seconds then reconnected it,and the code is gone. From what you posted ,the only thing I can guess is it picked up that code when I was on the dyno and it went over 150mph.

Or it happened when I broke traction the other day in the rain.

OR ,It could be a code coming from the fact that my speedo isn;t working.