Any JB4 guys want to share some 93 octane logs. I did well with the e30, but I’m having some issues with 93. The main thing is that I filled up with 93 on my way home and then parked it 5 minutes later. The next morning I took out my RS7 plugs and swapped in Densos. I went and ran a log where my timing was taking a 2-3 degree hit around 4,000 on up. I lowered my target by .8-1.2 throughout from that point on up. I then ran three more logs on my way into work. Right before I got to work a did a short 3rd gear acceleration onto a highway that wasn’t even revved out all of the way. Probably shifted into 4th before 5,000. I got an EPC for cylinder disabled. When I got into work I looked at the three logs. Each one looked worse than the previous with the timing. Areas that were 4-5 under the higher target were now at 0-.5. On the final log. My total advance that got up to 11-12 on the high boost, was now at 8-9. I’m not sure if it’s gas or plugs, but based on how it deteriorated, I’m guessing it’s the plugs. I’m currently running about the same boost as I was on the IS12 with a little more up top, but my timing is worse than it was in the IS12 with 93. I’m going to swap in the RS7 plugs, but I’m hoping to see what some other guys logged on just 93. JB4 only though. Stacks are going to be completely different
I switched to a new phone a month or so ago after a HW problem on my old phone. In the process, I lost my IS20 logs and custom maps from my old phone. Should have known better
I think I may be able to recover them with a bit of Android hacking, but I haven't had a chance to look into it yet. Pisses me off since I took IS20 logs from 16 PSI all the way up to the 21 PSI map I am currently running in +1 PSI increments. Getting good logs around here isn't easy either...not enough good open roads where it is safe and without worrying about speeding tickets. Having a fast car isn't as fun as it used to be when you live in a damn police state with red light and speed cameras all over the place! I'll let you know if I am able to recover any of them. I also thought I may have sent some to George, but I couldn't find any for the IS20...that may have only been for the JB1, JB4 on the IS12 since I was comfortable adjusting myself by then.
Just a thought...are you sure your WG is adjusted properly, or do you feel you are confident about being past that now? My timing has never been as advanced as yours, maybe a difference in stock tune (mine is a 2015 early production), or perhaps something else causing the difference. My max timing at 6000 RPM is usually somewhere in between yours on the IS12 and the APR logs I have seen. If I don't mix in any E85, I typically see some timing pull at WOT, but less than 2.0. AFR is good at 21 PSI and my trims stay in the 40's with FOL 70. I see a slightly lean spool-up as expected and then it dips down to 13-13.7 or so under WOT depending on conditions and fuel being used. The AFR logging bug drive me crazy though...I really hope the new JB4 firmware I am hearing about fixes this.
How bad is the lag on is20?
I didn't notice at all. You can also somewhat tune it out with the JB4 by adjusting the boost curve down low. I like to keep my front wheels from spinning anyhow and I limit boost in 1st and 2nd, so it is an all around non issue for me...maybe even a blessing in disguise. Also, just to note, my fuel economy hasn't had any noticeable degradation either. If I modulate my foot, I can still get essentially the same MPG on long trips and for my daily commute in the city. My E20-25 mixes take a little mileage hit as expected, but on 93 I don't notice any difference. Makes sense since the 1.8 doesn't do that much better than the GTI anyhow, especially in the real world.
