[Diy_efi] problem with ecu and injector duty

[Bobqzzi]

Do you know how much power you are producing at that rpm and what the A/F 
ratio is?


At 12:44 PM 11/14/2006 +1100, you wrote:
>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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