View Single Post
Old 01-27-2009, 11:42 AM   #28 (permalink)
dcb
needs more cowbell
 
dcb's Avatar
 
Join Date: Feb 2008
Location:
Posts: 5,038

pimp mobile - '81 suzuki gs 250 t
90 day: 96.29 mpg (US)

schnitzel - '01 Volkswagen Golf TDI
90 day: 53.56 mpg (US)
Thanks: 158
Thanked 267 Times in 210 Posts
Ok, 50k ohms it is, for rx and r2. I did some bench testing. With a 16.2v supply the pin went high at about 14.9v. That should translate to any injector signal that is 1.3 volts or more below system voltage registering as "injector open".

With 50k on two of the transistor leads, it will be pretty well isolated and should prove reliable.

It will also allow the strongest signal for the saturated injectors (the majority of vehicles have saturated as far as I can tell), whereas the resistor patch attenuates the signal for saturated injectors.

And it seems to be operating within established parameters.

So I like this solution now

Coyote, I'll ship this guy to you so you can play with it. You are short a guino so this works out pretty nicely
__________________
WINDMILLS DO NOT WORK THAT WAY!!!

Last edited by dcb; 01-27-2009 at 11:49 AM..
  Reply With Quote