[LPG2CV]

I suspect the max is High. but I used a HE sensor, so not to familier with vr.

Something to remember is that speedy is not MS. It works differently in some areas.

[fleagret]

Thank you both so much, it's working well enough that it drives now!
I found a base tune to modify, and had to re-flash back to an older firmware, but that's not a problem.
I also re-wired the earths for everything except the speeduino itself onto a busbar connected to the chassis, routing all the earths as far away from the coilpack as possible. It looks like routing any wiring in close proximity to the coilpack is really bad for signal interferance.

I drove for about 15 mins and it was fine except for a couple of hiccups, one where it felt like it entered limp mode as it lost power, resetting the power to the system - but not the speeduino as it was plugged in and logging at the time - solved the issue. I'm running a VW 106 b wasted spark smartcoil and I wonder if I've got the dwell times wrong and there's some internal protection doing something funky.

Now it's running properly it feels like I'll be able to troubleshoot much more easily, so thank you again!

[LPG2CV]

I assume you are using resistor type spark plugs from your MS days. If not, ensure you do. Also check the condition of the spark plugs. Poor condition, or those with a large gap will cause the coil to disccharge via any other route it can. If it can't discharge then it may just leak emi.

You need to fix the dwell voltage correction table! It should not have zero's in it!

[LPG2CV]

If you have a duel vr conditioner, then ground the cam output side.

In speeduino, you can't turn off the cam input. So if you are getting some odd running behavior, it's possible any emi is triggering the cam signal in the conditioner. Even if this is not the case, it is just good house keeping to do so.

[PSIG]

Good call, but if it helps — it is simpler and more effective to pull the INput side of the conditioner high or low. No fighting of conflicting output signals that way. This holds the conditioner or Hall input in one state (high or low), without random or variable output. It is the change in state that Speeduino reads as a signal, so hold it in one state.

As seen below in the typical Speeduino input circuit, the CAM input (if not used) can have JP5 applied to pull and hold that unconnected signal high. Or, anywhere on the INput side a jumper to ground to hold it low. Take your pick.

Crank-cam input schem.jpg (52.37 KiB) Viewed 1552 times

[RobertZalewski]

Hey, let's see if you turn on "high speed logger" the engine will run smoothly without sync losses ?

[fleagret]

Just to update, it's now running great. Maybe 1 sync error when driving, but I'm but certain that's not down to the age of the laptop.
I'm still getting what feels like a limp mode happening under higher rpm and engine loads. It doesn't show up as anything detectable in the log files so I'm wondering if there's some protection within the VW type coil pack.
If I find a definitive answer I'll update.

[LPG2CV]

post the current tune.

[fleagret]

Current tune below.

[jonbill]

If there's a loss of power ('limp mode') it really should show up in the log. Can you post the log?