Clearly like all micro's, if there is noise around it will probably generate issues.
After a couple of weeks of trials, the items below, in order of importance, seem to be what helps the most for a small space, bike design.
1. Resistor plugs (ones with a R in the code)
2. Resistor caps, initially I was worried about the additional 5k resistance but so far (pending dyno) they seem fine.
3. Silicone/carbon (not copper wire) ignition leads
4. The USB cable to run Tunerstudio live with must be high quality and not too long, also I found that using a couple of ferrites with at least one coil of USB inside, helped. Noise on the USB line will cause sync loss.
5. Wires between Speeduino and the trigger unit and from the trigger unit to the coils need to be screened cables. I use one for each coil feed with the earths connected at each end, which seemed better than a single ended earth.
6. The +ve to Speeduino benefits from a ferrite with at least 5 coils wound through it
7. The 0v to Speeduino also befits from a ferrite fitting
The latter two (6,7) need some more evaluation, as most of my problem was poor quality resistive plugs and caps and until I had those replaced, all of the above made improvements. I suspect that with quality plugs/caps, some of the other changes may not be required but again as a tight space build, they may still be useful.
Thanks everyone for the pointers. The real eye opener for me was the USB cable, I should have thought it would be an issue but didn't look there initially but it makes sense as its a direct line to the micro.
So all good. Final hurdle was to remember to zero the coolant and air temp sensor compensation curves (as I am not bothered about those sensors until I add the injectors) because they retard the ignition as an offset to the basic spark table and it turns out I was initially running at 15 degrees at startup (should be 24). I am amazed it started at all....the clue was running rich obviously.
Speeduino/Tunerstudio is pretty amazing but lots of ways to trip up!
Quick road run this week then back to the dyno then the fun starts with the injectors!
I am going to leave them in the throttle bodies as a starter then move to the crankcase later after another dyno run.
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