Attached are two screen shots from our data acq system.
The first is labeled OctoShop.pdf.
There are two channels visible, engine rpm and battery voltage. Voltage is in green. Notice how smooth is it and the two steps down are the two stages activating.
The other is labeled OctoRun.pdf.
There are four channels, engine rpm, battery voltage, N20Fuel 1 and 2. The time is on the x axis. Right at 0 seconds the transbrake is released and the engine accelerates. Immediately stage one nitrous is activated and the solenoids open. This is validated by N20Fuel1 psi dropping and also battery voltage dropping. Two tenths later the second stage is activated but the solenoids do not open. This is validated by the battery voltage not dropping further and the N20Fuel2 not dropping.
Look at right before one second, the battery voltage drops and N20Fuel2 drops. This is the second stage finally opening. It doesn't stay open though. This happens two more times going down the track.
The differences between the OctoRun and OctoShop are the transbrake wasn't activated, the engine rpm is lower, and the car is not moving.
No alternator, just a pretty large 16v battery..around 45lbs.
I am not a solenoid expert but I was told that solenoids draw the same current no matter how hard they have to 'work' The current draw is a function of coil resistance and the input voltage?
The MOSFETS Source is a copper busbar 0.040" thick and 0.500" wide.
Tonite the team is going to start the engine and activate my box in the same manner its activated on the track with the transbrake release. I am going to have them do that with the engine at low rpm and then at high rpm. Its going to be either a problem with the transbrake and/or electrical noise from higher engine rpm. I will let you know what I hear.
I am going to draw up a board tonite that opto-isolates all inputs and outputs and uses an isolated DC/DC converter to help with the electrical noise side. I will post the schematic tonite.
Thanks for the input.
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