[Diy_efi] problem with ecu and injector duty

[Damian Long]

Hi,
   
  I have a rather strange ecu. Most likely not many people have used it before. It is a Walbro Bike400. You can get some information from here www.walbro-tdd.com
   
  Since installing and running this ecu I've tuned the vehicle and found I've needed some very stupid injector opening times. At 2bar boost and 5500rpm I need 17mS opening time!
  Vehicle is 1600cc 4cyl turbo.
  The injectors are Nippon denso 16ohm 550cc/min @40psi. part no 1955000-2020. The fuel pump is a Bosch motorsport unit. 150lph @ 5bar. The pump, regulator and rail pressure all check out ok so I've discovered that its an issue with the ecu or wiring to the injectors. Basically the ecu need to send a 17mS opening time in order to get the injector to open long enough to supply fuel. The injectors are well sized for the application. 
  Does anyone have any ideas where I should be looking for a solution to the problem? So far I have the following ideas but now sure if any are relevant.
   
  1. ecu is designed for peak and hold injectors and this is why
  2. wiring to injectors wrong way round. ie. coil polarity wrong
  3. injector voltage offset table set up wrong in ecu
  4. ecu is lying or is just plain cr p and I should burn it
   
  I flow tested injectors. They are ok. Any ideas?
   
  thanks
   
   

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