Racepak.com

Hi everyone
I have been reading the forum and have an understanding how the gear selector work's for the IQ3 Dash in relation to GPS movement and gear ratio's, RPM etc but i would like the selector to work when i am in the pit's and there is no GPS movement and the engine may not be running . Is there another way someone has set this up for a Suzuki 2 Valve engine with a Liberty 6 speed gearbox ? The standard bikes gear box selector is for a 5 speed and has a disc with 5 seperate contact's that ground 12 volt's from 5 individual indicator light's to show gear selection ( I could modify this to 6 contact's ) . Can these 5 seperate 12 volt input's be fed into a module that can convert it to something the IQ3 Dash is compatible with ? Even if i could see 1 , neutral and 6 gear. I am using a V300 logger and have not purchased the dash yet in case i need something extra .
Cheers
Chris

Chris,

Are the signals coming from the indicator on the bike just a ground, for each of the gear position..as opposed to an actual voltage value which varies with gear position? If so, that makes it a bit more difficult to produce a valid gear position since each signal we get is just an event...which would be the same for every gear.

Lets first verify the we are looking at events for each gear position, then we can attempt to come up with a solution for your needs.

Thanks
Tim

If they are just switched grounds, you could rig it up to act as a potential divider.

Have a 5V signal going into the switch, and on each of the gear contacts have a wire running back to the signal input of a USM connected to the dash. In each of those wires have a resistor of a known and different value - ideally increasing in equal steps (eg 100 ohm, 200 ohm, 300 ohm etc). You can then tell the USM channel to use a pull up resistor on the supply, which will mean you have a linear increase in signal voltage (in discrete steps) with gear position. With the right calibration, you can make it so that it shows -1,0,1,2,3... Where -1 is reverse, 0 is neutral and positive numbers are gears. You can even display this on the dash (although it won't be able to do tge minus sign).

Just a thought...!

Hi Tim and Tristancliffe thank's for the reply.
Yes Tim the Gear selector is just a grounding mechanism. ie: all 5 wire's into the selector have a constant 12 volt's at all time's and the gear selector just rotates allowing each bulb to light up as the corresponding contact makes to earth . ( there is no wire on the output side of the selector as it earth's to the case of the engine directly )
Is Tristancliffe idea the way to go ?? As I have a bike the negative number for reverse won't be a problem as the bike doesn't have a reverse gear .
thanks
Chris

Chris

Yes, Tristan is correct (thanks Tristan) as we just need to see a different voltage value for each gear, coming out of your gear selector (well, voltage at our USM,created by using a pull up resistor setting). At that point, you should be able to get cal values set for the USM, that will allow you to see the gear (based on your cal values)

Thanks
Tim

Hi Everyone
I have purchased and installed the IQ3 dash and made up the resistor board ( designed by Racepak) so each gear shows a different voltage for the dash to indicate the 6 gears ( ranging from 4.58 volts to 0.50 volts ) this is sent through the USM via the 5 Volt and Signal terminals on channel #1.
Can anyone explain how i would configure this in Racepak. I use a V3oo and IQ3 Dash.
Cheers
Chris

5 Volt
Ground
Signal
5V to 10K resistor
Ohms K V Out
n 110 4.58
1 56 4.24
2 24 3.53
3 12 2.73
4 6.80 2.02
5 3.30 1.24
6 1.10 0.50
USM Module
10K resistor

Open Datalink and your vehicle config file.

Right click on the channel you will be using (if it hasn't appeared, you will need to READ the Vnet system with everything plugged in).

Set up the channel as you see fit (frequencies, names, channel ID etc)

Click on Channel Calibration Table (or similar, on the left hand side of the channel config window)

In the list, insert the voltages and the gear they represent.

Tell it that it's a Voltage Output sensor.

Click Calculate Cal Table - this will fill in the blanks (Datalink likes to see a full table) with interpolated data.

Click okay.

WRITE to the Vnet system so that everything knows the new config.

Save the config file.

Test it.

Thanks Tristancliffe
I went to a race meeting on the weekend and was able to get some phone assistance from Eric at Racepak while we were testing the bike. It took a little calibrating of the voltages as they would vary a little every time you went through the gears ( probably due to the resistance changing on the mechanical selector drum as it rotated not the resistor board ) but we got it in the end , so it is doing everything i wanted it to do. All good . Thanks again Tristancliffe and Eric for your assistance.
Cheers Chris