Electrical engineers, lets do this!
Looking for adjustable timing here. Damemorder and I were discussing this yesterday, and i was at Radio Shack and started thinking too much, so i didn't buy anything....
Basic info.. The IAT sensor detects incoming air, the colder the air coming in is, the more advanced your timing is. The resistor "chips" on ebay do this, but the PCM readjusts. The **** is nice for that race on the street you wanna do, and have a small advantage, or when you decide to do a spirited run somewhere.
The IAT is a thermistor, @ 140* it'* letting no current through at all. @ like -29 (i think) it'* letting the full 5v input pass through.
So less resistance = more timing.
Went to go get a Pot, a guy there suggested a Linear taper 10k ohm one. (does this sound good?) After some thinking, i realised that if you ran "normal" on no resistance in the pot, and turned it up, you'd kill your timing.
So my question is, should we integrate the Pot into the circuit just straight up, and hope the PCM accomodates the resistance of it in the "normal" position?
Or should we build a circuit that uses the IAT sensor'* voltage, as input, and output equals that resistance, but part of that resistance is the Pot set to "normal", so we can turn the pot'* resistance down, to add timing?
'06 Vee Dub GTI 2 door Tornado Red
- 2.0 Turbocharged, Intercooled, Direct Injected, 6 Speed DSG, Underbody Aero, 17" Classix
- Moonroof, Bi-Xenon headlamps, Interlagos Plaid Sport Seats, 6 Disc In-dash, iPod integration, GTI Monster Mats (winter)
'93 Bonneville SE Purple Pearl H4U package - picked up June 23, 2003, Traded-in June 28, 2007...