3800 Boost controller thingy

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imported_Ron Vogel

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OK, I'll post the schematic in the next couple of days for those handy with a soldering iron. Basically, the positive lead to the boost soleniod will supply power to a SPDT relay. One side out full voltage, one side a stepped down voltage. The stepped down voltage will have to be selected in the engine compartment, but the unit can be switched on and off from the cockpit. By limiting the voltage to the soleniod, full boost won't happen. I'll make a momentary switch and a hard switch for it. I could make a delay activated by a throttle switch, but it will be easier (and cheaper) to use manually. Now I can lay down full throttle through most of 1st gear without spinning too bad. Hoping to get some 1.8 60' times at IDDV...
 
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imported_Ron Vogel

Guest
OK, here's how to do it...You need an automotive 12v relay (SPDT),
4-10 diodes (radioshak pn 1n4148), and a spdt switch. Cut the pink
wire that leads to the boost soleniod. The side that connects to the
soleniod connects to the common post of the relay switch. The pink wire
leading to the harness connects to the normally on pole of the relay.
The other pole of the relay needs to have a stepped down voltage.
Each diode in line will drop the voltage .6 volts, so you will need
several to drop the voltage (I use 4 and it brings volts to 9v). to
simplify this, tap the pink wire voltage and put the diodes in line to
the the relay switched pole. You can also use a rotary switch with in-
line diodes to adjust the voltage if you wish. To switch the relay 12v
must be fed to it accross the coil. Run a wire to the cockpit from one
side of the coil and connect the other end to to a switched pole of the
spdt switch. The common pole of the spdt swtch should have 12v to it.
The other side to a indicator light attached to a ground. The other
side of the relay coil goes to an engine ground. This may sound
complicated, but it's a pretty simple circuit that is rock-solid.
I can put these together pretty easy, so I'll make a couple in case
anybody wants one.
 
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