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[roadrunner]

Hello all,

I am running into pinging/knock on hard acceleration on hot days (like yesterday 86deg). I have had Zippers tweek the map for me but still have the same issue. I usually have to back off the throttle and down shift. I am running a modified 103, S&S crank, Redshift 575 gear cams, fueling lifters back plate, adj push rods, Rhinehart exhaust with the autotune setup.

Any suggestions?
Cheers!
I did find this post;

 Re: Hot Head 110
« Reply #106 on: May 06, 2007, 08:37:53 PM » Quote  

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For the what its worth column, I found on all the maps I have been tinkering with on the Zippers AT, that some bikes just like a slightly retarded timing from what Zippers created. I think Zippers did a fine job, but some variables are bound to exist with each bike. Especially once in a while you get some cheap gas.  To be safe, I tried a few variables, but the first one I did was the following:

from 2016rpm to 2800 something range on the tmax, I retarded the timing by 1 little point.  In other words, lower 4 of those marks one level.  It was in this range I would sometimes get a very slight yet audible ping.  After this minor change, two things happened. One, it is cooler, and two, it actually feels stronger. (no ping does that)

And finally, as a reminder to all with the TMAX.  Zippers does some nice maps. But remember, the AutoTune only tunes and locks on what you tell it to do. Therefore, it is not unusual that each bike being a bit different, that a minor tweak in some areas (only 2 really) need attention. Those are the timimg, as described above, and the 32 AFR charts which can be modified..........one thing at a time though.

[roadrunner]

Found some info on Rear cylinder spark knock.

Hard to tell if its just the rear cylinder that pinging/knock.

Nice article on TMax and tuning;

http://www.youtube.com/watch?v=3ll2MG8PNtw&feature=channel

[Twolanerider]

The Zippers map have (or least had) a reputation for often being a bit aggressive on the timing side.  The T-Max module also ceases use of the ion sensing system onboard the bike that can detect detonation and back the timing off a bit at times of need.  If it pings your only option is to chase it.  Find the RPM and throttle position ranges it's happening.  Then take timing out or put fuel in as needed to solve the problem.

[roadrunner]

Thanks, anyone have a link to show reading the condition of your spark plugs ( to check for spark knock or detonation)?