| Author | Message | ||
     Jeremyp |
Would a Buell XB Speedometer/Tachometer work correctly installed on the Blast? | ||
| Reepicheep |
The tach pickup is off the cam position sensor, which is the same on both bikes. The speedo pickup is off the 5th gear teeth, so the input will be OK and it will read something, and I think 5th gear is the same in a blast and an XB. I assume the ECM does the conversion, so the blast ECM should still convert right in spite of the different final drive ratios. So... I'd say... probably. At worst the speedo will just read wrong. | ||
| Ezblast |
I dunno - I'm checking though - I know two guys who would know. JetLee and Loose1 - will get back with you. EZ | ||
| Ezblast |
Best answers I have all say maybe - that at most one or the other will be off, but both suspect a capacitor/resistor of one type or the other could fix the issue - double tach signal, or reduce/increase speed reading. Both are engineers, but could a regular guy figure that out - they cheated by using an xb harness, fi, etc - and just zeroing out all but the signal info of the rear cylinder, and tuning from there - both using xb top end, pistons and cams - both bikes book nicely, and the xb gauges work as well. EZ | ||
| Reepicheep |
Its a hall effect sensor kicking out a square wave, so a resistor or a cap won't do it. You would need something that reads the frequency of one square wave and outputs another frequency square wave. Which isn't actually as bad as it sounds. I suspect there are commercial units that would let you dial it in, if not, you could build one out of a PIC microcontroller for $10 worth of parts (and about 50 hours of learning, but that's a hobby  ). | ||
| Andersonhdj |
Very simply, use a hex schmidt trigger set to oscillate at a specific frequency, squared through one of the gates and summed with your incoming square wave , the difference between the 2 being your actual reading. You would probably need to use an "and" gate tied in somehow keep the speedo inactive while stationary. You would have to breadboard the whole trip first to iron out the bugs. Also not to forget 100nf across the chips to prevent spurious signals from causing grief. Have'nt actually done this, it's just an idea off the top of my head. | ||
| Reepicheep |
A PIC and 20 lines of C code sounds easier.  | ||
| Froggy |
It sounds like an aftermarket cluster like the Veypor VR2 that I have would be easier. It picks the the tach signal by splicing into the wires going into the ignition coil, and it gets speed off a magnetic sensor you mount to a wheel.   |
