Recent content by nick470

Thanks for the tables, this is helpful. Do you have the axis units so I know how to interpret them?

Looking at logs with controlled pulls from 2500-6500rpm is great for evaluating behavior under max load, but it also misses transient behavior. Since we only have a few knobs to turn with the JB4, issues in transient behavior naturally have to be addressed by adjusting the same things that...

After comparing these two logs, I decided to mix and match the best parts of each and try the result. I then made some secondary adjustments, like raising the trough a bit to try and bring ecu_psi and calc_tq a little closer to target. I also pulled boost targets down slightly on either side of...

And now for some actual log review. The car seemed reasonably happy with the super rounded duty bias from my previous post, but it was still showing some oscillation and general “control system unhappiness” at the start of the pull, and calc_tq pushing into the 48+ region in the midrange. I...

Got a lot more data, so I'm going to have to break this up into a couple posts in this thread. First, some rambling commentary on control systems that I had initially typed out in the middle of all my log review observations, but figured would make more sense (and be easier to skip) if I just...

Hope everyone is having a great holiday and spending some time with family. I've been steadily tweaking Map 6 and fed the car a little bit more corn. Now at ~E38. I had a hunch that the ECU was showing sensitivity to not only large JB4 offsets or sudden inputs in changes, but also to first and...

Alright, well I ignored my own sequence for testing this (was short on time and wanted to get some data) so I plugged in my Map 6 targets above, enabled bits 4 and 6, and took a log. https://datazap.me/u/nick470/map-6-first-pull-e30?log=0&data=1-2-3-4-11-14-18&solo=18&zoom=15-69 Boost Targets...

Alright so I have a list of things to try out, any suggestions on order of operations? Just put together a map 6 boost table based on the table you posted above, just softened a bit at low RPM and capped at 4.5. Haven't put it on the car yet, just brainstorming. map6_15 map6_20 map6_25...

Sorry, I should have included more information. this specific log was in "traction mode", stability control still enabled. I tried again with everything completely off and I'm still getting the surging. So this isn't TC intervention. The timing is a byproduct of the throttle cuts and load...

I'm suddenly getting significant throttle cuts in my pulls, any ideas what might have changed or is causing this? Ambient conditions have been pretty consistent. Almost wondering if there's a hardware issue? Haven't yet gone through to check connectors, make sure wires arent rubbing, etc, but...

Compiled the data from a bunch of logs on different E content to capture timing convergence in ign_1, which seems to be my best indicator of how happy the car is with the octane. Map 0: great correlation in my E20 and E25 runs, but there's a big step between E10 and E20. Need to try E15 to fill...

Wow, Colorado's 91oct, at least at this time of year, sucks. Gave the car 2 gallons of E70 for ~E19 and timing cleaned up significantly on just map 0. Logs: Map 0, 91oct (E10): https://datazap.me/u/nick470/log-1764371906?log=0&data=1-4-11-14-25-26-27-28-29 Map 0, E20 (w/ 91mix)...

Can you clarify on how the JB4 reports ignition timing in the current firmware? I see Ign_1 is showing higher values than 2-5, which are decently correlated. On others' logs, I'm seeing all 6 are showing more similar values. Additionally, am I seeing octane limitations even in Map 0? Or is this...

Map 0, traction off, FF set to 30: https://datazap.me/u/nick470/log-1764371906?log=0&data=1-4-11-20-23 Map 1, traction off, FF set to 30: https://datazap.me/u/nick470/map-1-mkv-supra-mt?log=0&data=1-4-11-20 I'm a little surprised that the mid-pull FF shows at 39-40 in both logs, I had to go...

Hey guys, new member here looking for some initial feedback on my Map 0 and Map 1 logs. Bone stock 2026 MT, 91 octane, located in Colorado so air density is absolutely pushing the compressor into a less efficient part of its operating range. This is on a JB4 with the fuel pressure add-on and...