• There has been a recent cluster of spammers accessing BARFer accounts and posting spam. To safeguard your account, please consider changing your password. It would be even better to take the additional step of enabling 2 Factor Authentication (2FA) on your BARF account. Read more here.

GPX Pro Brake pressure sensor

ithaca00

ithaca00

0.25 Liter
Joined
Mar 19, 2008
Location
Sacramento, California (way East Bay ;))
Moto(s)
Ninja 250
Eliminator 250
GSXR 450
ZX4RR
I'm trying to wire up a brake pressure sensor (SE-02) to my GPX pro. So far I've hooked up the wires as follows:
  • Red - 12V from bike
  • Yellow - Ground from bike
  • Blue - Green wire from Cable A

With this the power leads connected directly to the battery the pressure reading I get is nearly 2,000 psi without applying the brakes. With the leads connected through the power/ground signals for the other GPX sensors I get a resting pressure of 1,300 psi and maxed out reading with just the slightest application of the brake.

XT Racing's tech support just reaffirmed the wiring scheme and said if it was connected incorrectly it could be damaged. Thanks.:rolleyes

Does anyone have any experience with these sensors?
 
You can ohm out the sensor itself to see what the readings are. Also they sell a few different sensors, I ordered a brake pressure sender and got the 1600psi one not the 200psi one. Also... what generation of Pro do you have? The wiring color did change slightly from the pro to the pro4/8.
 
I have a more recent version of the GPX pro/8. The color references I made are for the sensor and not the GPX.

The sensor is a 2000psi unit. I'll check out the voltage output tonight. The calibration on this should be pretty linear so 0V=0psi and 5V=2000psi.
 
I asked about the GPX version because both manuals are still available online and the wiring harness did change slightly between them. Green should be channel 3.

I just checked and you are right it should be a 5v signal at 2000psi. Make sure your ground is good.
 
sorry I dont remember how theirs was wired up. I hated the GPX sensor so I made my own. thinking I may make a bunch more and sell them.....:) just replaces the banjo bolt. much easier to bleed the brakes
 

Attachments

  • 20160126_080234_001.jpg
    20160126_080234_001.jpg
    71 KB · Views: 5
Yup, green is Channel 3. It was hooked up to do Brake (on/off) before. XT racing responded and said that if my connections are correct then there could be something wrong with the sensor. The sensor was in a box of parts when I bought the bike so it looks new and unmolested. Maybe it didn't like being in said box...

I'll try a couple more things to test it.
 
doesn't the XT have to be connected to a manifold? could not find a place for it without running into something. why not just have it in the banjo bolt?
 
The breakout box for the GPX just makes it an easier connection for sensors. Right now they're just hardwired. The all of the other sensors work fine.

I'm leaning towards something wrong with this sensor... I checked it last night with the power leads connected to good sources and the output voltage from the SE02 was 8.2V with no brake application. With brake application the output was 9.7V. Theoretically this shouldn't be giving out more than 5V.:wtf
 
The SE-02 data sheet specifies 9-14v input. The 1600psi sensor I have (forgot the number) specifies 5v input. I am using the breakout box so I didn't have to wire the sensor manually.

Try the 5v and see what it does. You could also probably manually calibrate it and still get fairly meaningful results.
 
XT prob gets their sensors from someone else, someone that makes 5V and 9-14V sensors that look exactly the same :laughing
 
Yes, XT does not make any of their sensors in house. But thats also the nice thing about XT's setup is that they allow you to calibrate your own sensors. Also for the breakout boxes I know where to get those slick 4-pin connectors they use. :D
 
LabRat675 said:
Yes, XT does not make any of their sensors in house. But thats also the nice thing about XT's setup is that they allow you to calibrate your own sensors. Also for the breakout boxes I know where to get those slick 4-pin connectors they use. :D
Click to expand...

Can you share that information? I have a couple of sensors that I would love to build...
 
You must log in or register to reply here.
Back
Top