Proof Pressure switch near the nozzle.

[dlafont]

Hi Guys,

I am looking to put a proof pressure switch near the Alky nozzle using a Razor progessive system I bought from G-Bodyparts last fall.

This pressure switch will be used as a failsafe system which is hooked up to a 2-stage boost controller. The idea is when no/low alky pressure is at the nozzle then set boost to 15psi max and save the motor. When alky pressure is OK then increase max boost to 25psi.

The question I have is as follows:

1. What psi should I be setting the pressure switch near the nozzle to trigger at to indicate that the alky pressure is high enough?

2. What happends if we have boost in the up-pipe and the alky line is full of air (no alky). Will the pressure switch falsely indicate the pressure is OK due to the pressure created by intake pressure feeding back into the alky line?

Some thoughts I had regarding this:

Either I set the pressure switch so that it switches at something like 30psi (greater than max intake pressure possible). If I do is it possible in a progressive system that alky pressure may not achieve this pressure initially at lower boost levels? Or... maybe this is OK because it's only controlling the boost controller for max boost and as the intake boost increases to 15psi the alky pressure will rise above 30psi and switch on max boost on the boost controller at that point?

Any feedback on this is appreciated.

Thanks

 

[Razor]

The problem with only monitoring the alky system is that its only one variable. You have a fuel pump, fuel filter, regulator, 6 injectors, computer, etc.. all components that make up your fuel delivery.

Why only look at alky, look at the whole picture. Put a wide band set to trip if air fuel goes leaner than you'd like. DYNOJET RESEARCH INC. the wideband commander will output a relay.. then activate boost controller, lamp, etc.. and get out.

Your system already has pressure monitoring. The "o" terminal on the controller can be used for this purpose. No need for another switch or complication.

Easy.

Julio