SlaughterOfTheSoul
Actual Engineer
If you tell me more about the circuit then I can tell you how to handle it.The GT350 IM appears to use the same sensors that the 15-17 IM uses which would mean that the voltage is the same so no adjustments will be needed.
I'm pretty confident that tuners will be able to adjust the target voltages so that everything will work correctly. Only reason I'm going to try the resistor method tomorrow(Which I don't think will work) is because I have plenty of extra parts, since I ordered enough to make 20 sets of adaptors, and I'm impatient and want to get my car running correctly but Lund isn't open until Monday.
In the mean time, if you want that voltage to read lower then measure the current going through that circuit. From there, you use V=IR to get the voltage drop for that resistor. Since we want to drop .4vdc then it would be I(measured)*R(calculated)=.4vdc. You sound like you may already realize this, but it's worth noting.
We may run into the issue where the sensor impedance is too high as it is, thus the voltage drop across it is reading to high. If that's the case, you'll gave to drop its effective impedance by 20% to be effective which may affect the operation.
Otherwise we could probably just scale it with a simple op-amp circuit.
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