Pre-ignition is defined as something causing the mixture to ignite before the plug does. Too advanced timing may be what you mean and that can be corrected by retarding the timing.

Detonation occurs after the spark plug ignites the mixture.

Allen Kline was an angineer on the Northstar project. He wrote a very interesting article on the subject. Here's a link.

http://www.contactmagazine.com/Issue...ineBasics.html

 

Thanks and I still have the plugs which were in actually pretty good shape. I will give that a try when I get home this weekend.

Thanks!

 

Thanks to all for your replies. I have some things to do when I get back home - have to email my current map to Chad and to replace the existing with the original plugs to see if it goes away.

Just wanted to let everyone know that I can't try these things until I get home this weekend and the possibility exists that I may not get home until the 28th depending on my current client. Just don't want folks thinking I lost interest - just traveling.

Thanks again for your input.

 

I am going to email you the current map, but my question is - the current map was supplied by PV as a base and I then performed a couple of auto tune sessions. When I try to load the auto tune map it always says "no o2 sensors present" so it seems you cannot auto tune, load it and auto tune a previous auto tune if that makes any sense.

My assumption is that I would send the base map/tune that was given to me by FM?

Thanks

 

Great article, thanks for the link. Damon terminology gets me every time.

 

Finally able to respond and resurrect my search for a solution.

Just emailed you the map and log (sent in case you deleted).

Thanks again!

 

Resurrecting this thread - I have had time to give this some attention.

Here is what has been done so far -

1. Chad (Wide Open Cycles) generously sent me a tune to start with that modified the spark tables.
2. I loaded that tune and then immediately started an auto tune session.
3. The pinging seems to have gone away, but I know there are tuning opportunities with this tune.

I have included the logs from a ride. The bike runs pretty well, but the gas mileage is pretty horrible (39) after auto tuning and it was 44 before. It also pops and backfires a bit sometimes at idle giving it throttle.


Question - will the auto tune resolve these issues? The current tune is the result of about a 1 hour auto tune session, seems to have gotten a bit better but the throttle issue and gas mileage need to be corrected.


Thanks for looking!

 

You could put it back the way it was, let it ping and get the better fuel mileage.

 

Hey what was your issue you stated in the original post? I just did Andrews 48h cams and I am having an ordeal with it when I start moving from a stop. It bogs real bad. What was your issue if you don't mind?

 

I do not have a solution yet. I am still running my auto tune session, but have been out of town and leave again tomorrow for a week so won't get back to this until next weekend.

If you have a PV then ask the folks at Dynojet to send a new map and give them your configuration, if not then I will have to defer to the folks on here because I would have no idea how to fix that outside of being able to adjust parameters within the ECM.