Speedo Correction Device Wiring

[Fred H.]

I have a new Yellow Box speedo correction device that I am attempting to wire into my 06. Basically, it takes the speedo signal and applies a correction factor to it by massaging the pulse width of the signal.

Here is my dilemma. The 06 has sensors on each wheel for the ABS, and both of these sensors feed into the ABS box. The Yellow box correction device has to go AFTER the ABS gets the wheel speed signal or else it will cause the ABS to be inaccurate and faulty.

The speedo signal then comes out of the ABS brain and goes to the ECU. It then comes out of the ECU and goes to the meter assy. The signal INTO the ECU from the ABS brain looks like a normal speedo pulse (about 5v high to low) but the signal OUT of the ECU to the speedometer seems to be riding on a 12v floating level. I haven't scoped it yet, but I did back probe the ECU with a DVM.

Anyway, I am wondering if I should just apply the correction to the signal before it goes into the ECU or if I should do it after it comes out. My worry is that the ECU may use the speedo signal for some internal calculations, and that if I correct it before it gets it, that it may throw off the FI pulses. But from what I can see of the signal after it comes out of the ECU, I am not sure the device will work there.

Has anyone been down this path before on an ABS bike? Does Alman or Speedohealer or anyone else make a plug in device for this bike, and if so, where does it connect to?

Any advice would be most appreciated.

 

[jimbemotumbo]

Since I don't have an answer, I should just shut up, but I am curious. Why would you want to do this?

It would seem that the speedo is always slightly off, due to tire wear, inflation changes, loading, tire swaps, etc. So, you'd always have to fool with the correction factor to have it just so. I'm probably all wet, here. I mean, I failed math 110 the first time around. I just don;t get it.

Sorry to hijack ... I now return you to your thread. Though if anyone can explain it, please do.

 

[Fred H.]

The speedo on my 06 is off by almost 5mph at 70mph. I don't like a speedometer that reads high. The correction box fixes it so it reads accuratly like it should. You set it once and never touch it again. I have had one on my other bike for the past 92K miles and I only set it once when I first installed it. Tire wear has very little affect on the speedometer. It is not enough to be concerned about.

What I am concerned about is the built in 5mph error from the factory, and I want to get rid of it. A measurement device should never be designed with an error in it, and I wish motorcycle manufactures would stop doing it.

Now, does anyone know the color of the speedo wire from the ECM to the meter assy? I think it is a yellow wire with a blue stripe on it. Can anyone confirm this (ABS model).

 

[Rogue]

Another Hijack .

If you correct the speedo, will that throw the Odo off?

 

[Bearly Flying]

What are you running for tire pressure, that can have a significant effect on your speedo. The next set of tires will change the speedo again, different tire's can have a different circumferance. If it's that critical to know your exact speed, get a GPS.

 

[Bluestreek]

I noticed about a 16 mile difference between the odometer and my gps after doing 1040 miles. Thats about a mile and a half for every 100. I wouldn't loose any sleep over that.

 

[ionbeam]

Must be a new '06 change. On the '03-'05 USA models the speedo is controlled by a VSS signal (Vehicle Speed Sensor). The VSS connector plugs into the sensor on the back side of the engine near the swing arm pivot. VSS signal is very high frequency (for a motorcycle).

 

[Fred H.]

It appears that only the AE model has the speedo sensor in the gearbox. On the standard 06 is has been replaced by a gear position indicator.

 

[Dallara]

Well,

There are three easier ways to find, and know, your true speed.

1.) Find someone with either a radar gun, or an accurate speedo... And note your tach RPM in different gears at specific known speeds. Once you have a few of these RPM points in gears plotted, you can make up a very, very accurate chart to determine your exact speed from your tach readings. Try to memorize it. Tape it to your tank if need be for a while until you know it by heart. Since the speeds will be based on your own tach output, they will be accurate assuming the speed measuring device you used to plot 'em was accurate.

2.) Buy a bicycle speedo/computer... Measure your front tire circumference, hang the bike computer sensor and program it. These are really accurate, and I have used them on a number of bikes. After trying many, I like Sigma's best.

3.) Get a GPS. YOu can even use this to determine speeds in gears at certain RPM's, so you can use the tach as your speedo when the GPS is off the bike...

Personally, I wouldn't want to chance frying an expensive piece of electronic hardware on my new 2006 FJR, and certainly cooking it with an aftermarket "correction device" might make it tough to get that ECU or the like warrantied. Didn't you already bend a bracket Yamaha won't warranty trying to do this, Fred?

Shoot, once I get my GPS mounted I'll know my true road speed, and then if my speedo is 5 MPH off, for instance, I'll just know to add 5 MPH in my head...

Just my two rubles... YMMV.

Dallara

 

[Feejer/Weejer man]

After having a GPS for almost three years on the FJR I can't imaging being without it. The biggest thing is getting to know how to use all it can do. Just a note, if stopped by a leo for speeding don't let him see top speed recorded by said unit.

 

[Fred H.]

Well, I seem to be getting lots of replies about why I don't need a speedo correction device or how I can count telephone poles and multiply by 2.5 and then subtract 56 times the square root of pie while going down the road.

I have had a speed correction device on my Wing for 92 thousand miles and my speedometer is dead on with my GPS, old tires or new, no matter what brand I use. It just works and I like being able to look at my speedometer in a glance and not have to think and do subtraction to get my real speed. Sure, I can do that, but it is an annoyance, and I want it to be more accurate and not 5 MPH fast all the time. Is that asking too much?

By the way, I already have a GPS on the bike, with doppler weather radar no less. I still want the stinking speedometer to read accuratly like it should.

I think I got one reply from someone that related to my original question.

FYI, it appears there is a plastic cover at the back of the engine where the speed sensor used to go. Now I believe it is taken off the output of the ABS brain box to the EC. The wiring diagrams don't show signal names but I did find the 5volt signal at an input to the ECU and I can monitor it with a DVM as I spin the rear wheel and see the pulses. However, it looks like the ECU does a conversion of some sort on it as it is around 9 volts when it goes to the meter panel and I can no longer see the pulses. I probably need to scope it and see what it looks like out of the ECU.

I wonder if the ECU itself uses the speedo signal for any of it's calculations for the FI system. I suspect it doesn't though it may do the calculations for the MPG number that is passed to the meter panel. Though that calculation could also be done inside the meter panel itself since it has the info from the fuel sender and speedo, it should be easy enough to do. I haven't looked to see if there is a fuel flow sensor on the bike somewhere, but I would be surprised if they went to that level of sophistication on a motorcycle.

 

[Fred H.]

I also see that there is no nuetral sensor switch on the 06 A model. There is one on the AE, as well as a YCC-S speedo sensor on the gear box, but the 06A is sans both of these items, replaced with a gear indicator sensor. The wiring for the two models is also significantly different.

 

[Dallara]

Sounds like you got a copy of the 2006 Service Manual, Fred.

That's good. Did you get from your dealer?

Dallara

 

[RTSR1/FJR]

Go with SpeedoHealer. Plug and play! Enough said.

https://www.speedohealer.com/eng/intro.htm

 

[Feejer/Weejer man]

Geeze sorry for the thought. Next time I won't post to anything you ask. You should be polite read and take the advice for what it is worth to you. Dont' belittle us for trying to help. Our mothers did that for us. When people post they are giving you a suggestion. Next time post " Only those who deem to have pertanent information need to reply. Man!!

 

[SkooterG]

Geeze sorry for the thought. Next time I won't post to anything you ask. You should be polite read and take the advice for what it is worth to you. Dont' belittle us for trying to help. Our mothers did that for us. When people post they are giving you a suggestion. Next time post " Only those who deem to have pertanent information need to reply. Man!!

Actually, I kinda felt bad for poor Fred. Nobody was responding to info he specifically asked for. What he got was people poo-pooing his idea even though he specifically said it had worked well for him in the past.

<_<

 

[Powerman]

I'm with you Fred, it bothers me too. But I have no advice for you.

When I get my 06 maybe we can share info, I'm an electronics guy.

I'd like to get a scope on those signals myself.

I only have one out of five vehicles that is accurate!

I still don't understand why manufacturers like the high readings?

I hate to add in the correction factors when I drive.

 

[Feejer/Weejer man]

Then I guess he should have figured no one has an educated response. But man to chastise us for not responding correctly is uncalled for. No one called him an idiot for his idea so why did he basically rip us for our responses. Even my 13 year old daughter would have understood that no one responded with the info she needed and she would have looked elsewhere. Never would she blame the responders for trying to help.

 

[Fred H.]

Sorry if I got a bit testy in my reply earlier. I was starting to get pretty frustrated with this project and I felt like it wasn't going to work. I apologize to anyone I offended.

But the good news is, I got er done, and it is now installed and working properly. No more inaccurate speedo for me.