Had a similar issue on Saturday at a track day - running map 2/3 on my self-mixed (guesstimate) E30 that I ran on the street just fine in map 3 for years. 7-10 minutes in, power just disappeared, and no boost, otherwise ran fine. At first, I thought the BMS IC hose had popped again (happened once 2 years ago at track day) - but that was solid. Tank was 1/4 after that session, filled up with track pump 96. So at that point, can't be much E85 left, mostly just 96. Car starts off fine, again, ran 5-7 minutes at full power (I think map 2 this time), then no boost. Otherwise, running ok, shifting fine, no hesitation, just 0 boost.
Finally searched a bit (it's been a while since I set everything up, and it's been mostly set-and-forget about it for 2-3 years) and remembered the HPFP crashing problem.
Ran on map 0 the remaining 3 sessions, and no issues at all - car ran at stock power and was rock solid. Oil temps were ~250F (brand new Motul 5w40), ambient ~90F - in the past I ran in 100F+ in map 2/3/4 with no issues. Haven't really changed much since, so was surprised by this. No CEL, after a restart everything was fine. Water temps were middle-of-the-gauge, I have a trans cooler + AMS Signature ATF.
Here's the annoying part: I have no logs. In the past, since I'm a noob, I've accidentally hit the "phone" buttons on the steering wheel while cornering and initiated a phone call in the middle of my track session (redial last number). So now, I set my Mando to 80/80, then turn off bluetooth during the session to avoid that issue.
Any guesses as to whether it's overboost or HPFP cut? Going to log map 3 on the way home, but it's unlikely I'll get an actual good "run" in - always traffic here during the day. '19 GT1 AWD with ~40 K miles. DIY intakes, jb4 map 2/3 (just
fuel wires), right now, half a tank of mostly 96. I have some older logs with the same setup, I guess I'll scour those for high boost values.
What reading of HPFP would indicate a problem there?
