[Diy_efi] problem with ecu and injector duty
Jason M.
galaxiecustom500
Tue Nov 14 02:05:39 UTC 2006
Does the fuel pressure regulator compensate for boost pressure?
----- Original Message -----
From: "Damian Long" <bigcow_610 at yahoo.com.au>
To: <diy_efi at diy-efi.org>
Sent: Monday, November 13, 2006 8:44 PM
Subject: [Diy_efi] problem with ecu and injector duty
> 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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