Autosport Labs

Actually I used an 18V cordless drill! :D I took my time, made a jig ( out of spare stuff I had laying around ) to hold the pulley and the bit at the same time. I rotated the pulley in the jig between each drill and clamped it back down. I drilled the holes so that the width of the holes was the sam...

Occasionally one of my hair-brained ideas works. (A blind squirrel occasionally finds a nut)

Glad you took the chance to try something out of the box and were successful.

Ditto on the price? Precision of analog inputs? Analog input range? Will the analog inputs be scalable against an external Vref? Will the analog inputs be high impedance, or will they be pulled up, or selectable? By the looks of it, the analog inputs will be single ended only and not differential? C...

Just thought I would post an installed picture.
Ignore the timing marks, they are off 130 degrees now due to the new keyway I made to relocate the sensor.

Miniman: Since you came from CA, I just had to say welcome to winter.

Not really. It's not intended to be a fully 'closed loop control' system like how Saab does their engine management. Brent, Interesting, does Saab have a way to control the ignition just by working engine variables, or is it still based on a default map for the particular engine? If they do, I woul...

Brent is correct. You can over advance to a point of less efficiency and or power without necessarily having knock.

Alexander_Monday wrote:... you need some method of continuing to raising the AUX input as long as knock is detected, and lowering it when not, both at a controlled rate.

If I am reading your idea correctly it would achieve exactly that.

Thank you, however to be truthful my motivation was necessity.
I have a trigger wheel from a ford, but thinking about trying to adapt it to this kind of pulley made my head hurt.

I don't know what your ignition was before the change, however if it was distributor based, any slop in the distributor drive, gears, shaft, etc. will cause scatter. Scatter is where the ignition timing varies (or scatters) when it is not supposed to. I found that the rock solid timing from EDIS gav...

Assuming Type 1 VW ( and I would guess Type 3, but don't own one ) TDC should be 90 degrees clockwise from the woodruff key. I can't tell exactly because the picture is at an angle, however it appears correct. Yes, the holes should be on the 5 degree lines to make the "teeth" on 10 degree ...

Also, some usb to serial adapters will select the next available com port when you plug it in, so depending on other external adapters like blue tooth, etc. it is possible that it can change when you insert it the next time. Just something to think about after you get it working, and then one day it...

Yes, a crowbar of some sort would be better than a zener, but the zener is quick and easy protection, and I am interfacing with a thermocouple multiplexer I built that in normal operating range should never peak above 4V, and I had a 4.7V zener laying around, so---

If you are an electronics experimenter and can adapt and build from datasheets, I have used the TC9400 for this type of application before. It is a very stable and accurate frequency to voltage or voltage to frequency chip and is cheap. Make sure you filter the output good, because is does have a sa...

I'm not sure that what you are trying to achieve here would outweigh the complexity. If you are worried about idle or transition, maybe I am the exception, but I am running a 2110cc 4 cylinder with 44MM intake valves, 37.5MM exhaust valves, very large ports, dual Weber carbs and a very aggressive ca...