Because there are some posters that actually know what they are talking about and some that don't really have a clue.

It may help a bit but I have seen "better" results with timing adjustments.

 

Thanks let me see if I remember how this works, advance timing will make the bike run hotter, retard the timing will run cooler? am I right?

 

As far as the OP a true change that small will have very little effect. If you fall off the O2 valid range cliff, there may be a big (bad effect).

Andy

 

Not really. Too advanced or retarded can cause heat. With too much advance detonation can happen. Too retarded and preignition can be caused. I would suggest adding a couple of degrees and seeing how that helps with engine temps, and pay attention to knock activity. Might have to add up to 6-8 points and let ECM pull timing. Then pull half of what it did in the calibration. Recheck.


I apologize for hijacking your thread. I got caught up once again. I would just hate for the BS, misinformation to gain legs and guys think it is worth anything.

 

Hardtail / Doc thanks for posting some really valuable info. Along the lines of this thread, the stoich factor seems to play a large role in where the afr is. With pump gas, 93 octane, in many areas is up to 10% ethanol, with no real set number, is it better use a higher stoich to begin with? With lambda say .977, does the afr really matter other than fuel mileage and maybe a little cooler engine? For a stage one, what lambda in your opinion gives you the best overall performance? Just curious.

 

songs good, thanks, the timing seems to be the way to go

 

If you are using the TTS Master Tune I would NOT do a timing change, these timing tables are already very aggressive....too much more will put you over the top. If you have the Pro Tuner then you have a lot of room to add some timing to cool it down as Jason said, however after you make a timing change with that tuner go back and open the map from the VCI, you might see the timing you entered in the new map did not take......just check it and see if your change actually went in the ECM. The Pro Tuner has been known to trick you here, Harley don't want you people to change timing among other tables that don't work with that device.
Running 13.8 afr from 14.2 will definitely cool your bike down and personally I would do it that way....it's MUCH safer.
I quit posting on this subject because of the BS that comes out of some peoples minds that don't have a clue how to tune a bike and makes a living arguing with a STOP SIGNS.

 

When I'm finished synchronizing the VE Tables with a Lambda value of .977 (14.34 afr) I return my Lambda table back to the original setting. I do make a few changes in the 90, 95, 100 kPa columns because I personally think this area of the map is too rich.....I lean it out sightly.....but this is my decision, it is not necessary.
Nothing is going to happen to this motor running leaner mixture in a NO load area, as the load increases the fuel gets richer and the stock setting does this transaction very well.
Yes milage will be effected but adding fuel will cool the engine down without a doubt.
Doc

 

Thanks Doc.