MoTeC Global Forum

Hi,

I'm trying to setup a pneumatic quick shift system for the DIT Formula Student team.

I'm using an M400 ECU with a wr450 single cylinder engine.

The upshift works fine but when I use the down shift paddle nothing happens. However it works when I hard wire the pneumatic system directly to the Paddles. Also the ECU is receiving the Downshift request signal.

So it's not failing on a Mechanical and Electronic aspect. It must be an ECU issue.

This is the way I have it setup:

GEAR IGNITION CUT

CUT MODE : 2 (DELAY FROM CUT SIGNAL)
CUT SOURCE : 6 (GEAR SHIFT FUNCTION)
MIN RPM : 1500
MIN THROTTLE POS: 5
ARM DELAY: 300

GEAR SHIFT

MODE : 1 (USE DIGITAL INPUTS)
ARM DELAY : 350

DOWN SHIFT

DOWN MAXIMUM RPM : 10500
DOWN MAXIMUM THROTTLE : 60
DOWN OUTPUT DURATION : 120
AUTOMATIC DOWN SHIFT : 1

Also I'm using this without a gear position sensor, since the gearbox was modified to have N as the front gear.

I have played around in the ignition cut function, with no succes.

Any Ideas how I could make this work?

Hello,
Can you send me your ECU configuration file please.

I attached ECU config below

Ok,
Without the gear position sensor attached but the gear position setup turned on it will be causing problems. You should turn off the gear calculation and make the default gear something higher than 1. Without a gear position sensor attached the ECU will not be able to calculate gear so this calculation should be turned off. If the default is 1st gear the shift function will not allow a down shift because you have not clutch input. The logic of the function is not to get into or out of 1st without a clutch input.

I would always recommend the full set up with clutch input and fully working gear position potentiometer.