Quote:
Originally Posted by bpu699
Wow. Thanks!
Bo
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and if you want to experiment and see how your car runs with a little richer mixture there's all kinds of expensive gadgets and other short lived stuff you can buy to do it with CIS, lol...
Once you've been driving for 15-20 minutes and the motor is at operating temperature open the engine lid and un plug the 12 volt supply plug on the control pressure/WUR and go back to driving.
Over a 10-15 minute period the CPR will cool off to engine heat ambient temperature and control pressure will slowly drop around 20 psi from where it was and it will let the air flow meter push the control plunger higher in the fuel head uncovering more of the fuel metering slits and then it will shoot more fuel to the injectors richening up the mixture.
If you have a wideband AFR gauge you'll quickly learn what AFR your motor runs at best.
Then stop and plug the 12 volt plug back into the CPR and control pressure will rise back up to where it was in 2-3 minutes leaning out the AFR as it does it.
Now if you're really crazy you can experiment with wire wound ceramic resistors or 8 ohm wire wound speaker L pad potentiometers in the 12 volt supply or the ground wire to the CPR to lower the current going through the heater element on the bimetallic spring inside the CPR and adjust how fast it warms up or how hot it gets. That will give you adjustable AFR with CIS from the driver seat.
CIS is 100% old school mechanical fuel injection and this is how you can easily adjust your AFR with it for less than 10 bucks.