I am really glad this topic came up as I was just about to post a new thread on how do I tune for distance tables. I recently posted a thread on IMRC deletes (
https://www.hptuners.com/forum/showt...-delete-tuning ) and have played with many different settings by disabling many maps to see best performance without using IMRC's. On my S550 I disabled all but maps 14, 15, 16, 21 and OP, mainly using map 21 for my WOT spark and OP for cams, just an an experiment. My setup is E85, long tube headers, GT350 intake with stock TB. I was also using stock distance tables and map point configurations for emission reduction, fuel economy and optimal stability as I did not know much about how these worked. Using these maps alone and some OP cam timing the car runs great I can run up to 32 degrees of timing before knock. Per the thread I posted on IMRC's, Murfie suggested I look up a Vortech tune for reference and found this link (
https://www.hptuners.com/forum/showt...5-vortech-tune ) which I experimented and copied all the map point configurations but not the distance tables and left everything else the same......
Attachment 69741
.....This tune has maps 14-25 enabled. When I did this and went to go log I had horrible knock and after many spark adjustments I found I could not run my timing past 28 degrees before knock, which I found very strange because I was getting knock at WOT on the same map 21 as I used before in the previous tune which I could get up to 32 degrees timing without knock, knowing all cam timing was coming from the same OP came tables on both tunes, so I really don't know what other difference caused such a huge change. I can only think that by not configuring the distance tables had something to do with the car not running right spark wise. Question is, can anyone please explain how these distance tables work, because when looking at this Vortech link tune posted (see below pic), the distance tables "values" don't point to any map points that are turned on even though the car cycles through them on the log. Same can be said for the stock distance tables I used on my first tune, so maybe I am not understanding how these tables work correctly or how these values are used. Why at WOT I could not get the same spark timing too? Also, is there a way when going into WOT you can pick only one map to use?
Attachment 69742