3 Attachment(s)
Knock, knock... Lean who?
Happy new year everybody!
I'm hoping someone might be able to help... I seem to have a knock, and it is causing the VCM to go full retard. <- I think
I've been using HP tuners for a few years, but I've never touched the VE or map tables> I basically found a tune in the repo, mod'd the shift points and vat and fan and speed settings, loaded it up, and have been happily blatting around until... I noticed that it would start lacking power, generally under cruise with a load. In particular towing a trailer at 100km/h, then a slight incline. A back off, and then power-on seemed to fix it momentarily.
Plug in dash-command, I was able to corelate the apparent loss in power to the timing going to zero.
Since then, I've been logging with HPT and found that the LTFT were off the scale. One thing I've always doubted is the reference on my fuel pressure regular. I had read somewhere that Commodore LS1 fuel pressure needed to reference against atmosphere, not manifold vacuum, but for some reason, I had connected it :doh:. I rectified that (golf tee well spent), and with more logging, I can see that it has improved, but still not enough (14% is better than 21%!).
Looking back at early logs from when I built it, there are no knock retards, or maybe I didn't record it? I dunno.
Anyway, I'm hoping that someone would be kind enough to look over my logs, and see if there is something else there that perhaps I should be looking at? Is LTFT a symptom or a cause? I don't mind having a go/learning how to tune it, manually, with, or without a wideband, but would very much appreciate a some direction.
The vehicle is a 80-series Landcruiser with a '99 VT2 Commodore 5.7l LS1, 4L60E (hardened), LC transfer case to LC 4.11 & 32" rubber. Custom headers into twin cats and single 4". O2 sensors in [as close as possible to] original location. LC steel-wall air intake box (I'm guessing why IAT is so high always). EL Falcon twin thermos. Umm... Sandon AC.
I've read through the stickies, and have attached hpt, hpl & cfg.Attachment 106468Attachment 106469Attachment 106470
I'm hoping someone can find something, or steer me in a direction.
Cheers!