JB4 map 2 3 and 4 log

[ColinRobinson]

2020 GT1 with intakes, bov, and densos at .022
93 octane and 4 gallons of E85.

 

[Thomby]

Those quick 40-60mph rips don't give a ton to go on, but I do see one where you did 10-60 and a map 4 run from about 40-80, and nothing looks immediately concerning. Your ign2-6 columns are how much it's pulling timing relative to cyl1 and the 0.8s and 1.5s (and a couple 2.3s for map 4) aren't a concern.

Instead of a bunch of short runs where the car has to downshift, rev, and build boost, just try a single WOT pull from say 15-25mph up to 75 or whatever you have room for. That'll give a couple full gears of full boost, redline, and timing advance to look at.

 

[ColinRobinson]

These might be a little better

 

[Thomby]

Both of those hit triple digits but still with a ton of on/off throttle...it's not the top speed that matters, it's sustained full throttle through the rev range. Just find somewhere you can put your foot down around 15-20 and not lift until 70ish and you're good. All those WOT blips at 70-100mph are just risking you a ticket/wreck.

Map 3 has a good pull from about 30-115mph in rows 117-197. Here's what it looks like in Datazap:
- Green line (leftmost axis) is speed, Blue line (next leftmost axis) is pedal, Grey line (third leftmost axis) is rpm, making shifts obvious (important for ign/timing advance)

- The rest of lines are on the right axis. Purple is the ign_1 column, or absolute timing advance, which you want to see building with revs, and sudden drops >3 degrees indicate timing being pulled due to knock. Your only drops are at shift points which is expected. So far so good.

- The lines at the bottom are ign_2-6, which are cylinder 2-6 timing retard relative to cyl1, and again it's the 3+ values we care about. Your file has a bunch of 0.8 and 1.5s which we can ignore, but if you look at the part just after your second shift (rows 160-175 in the file), you have a handful of 5.3s in ign4, and then some 3.8s in ign6.

So you could be hitting octane limits. Might be worth increasing e85 to 5 or 6 gallons/tank instead of 4. You don't need to empty your tank to do this, just add about 1.25-1.5gal per quarter tank (so 2.5-3gal if you're half full, etc) with the rest 93, then do another good pull. Or hop on the BMS forums and see what they think.

 

[ColinRobinson]

Thanks I will try to get some better readings and top off with another gallon of e85.