Who uses these and why? I've always used the fixed ones, but Mo only sells the adjustable.
You set it with an ohm meter, right? One post I saw in a drag racing forum showed a chart with resistance for each 100 of RPM. For 6800 RPMs, set to 5449 ohms. How expensive does that ohmmeter have to be to be accurate enough?
I don't want to wonder if the chip or ohm meter is accurate enough for a particular day and I'm not going to be re-setting it because ambient temp, age or something else makes the thing vary which might get my rental hotshoe DQ'd.
So why should I buy an adjustable one when I can go down to the local performance shop and buy the fixed one. (although last I checked I have to buy a range of 10, so maybe there's no savings.)