ISCV control system disassembly
#421
EvoM Community Team Leader
just my opinion but I would want to preserve some utility from the biss, so when tuning if i had to adjust it in an extreme either way, almost fully open or closed etc. then I would probably adjust the tune. This of course assumes no mechanical issues. I'm only working from a sample size of myself so perhaps more experienced people will chime in with their approach.
#422
EvoM Community Team Leader
iTrader: (60)
#429
Evolved Member
iTrader: (1)
biss screw north of the ticking lifters youve replaced 3 times but still tick...lol that had me crying haha...the video is perfect man...clear as day...makes alot of sense...i always thought to mess with the biss screw you had to activate the speed adjustment screw mode in evoscan and make the adjustments then...didnt know you could just turn the screw without it...good to know...thx brother...now, lets see how this works with gsc s2 cams...if my car wasnt in pieces id go outside right now...soon!...
#430
EvoM Community Team Leader
iTrader: (60)
biss screw north of the ticking lifters youve replaced 3 times but still tick...lol that had me crying haha...the video is perfect man...clear as day...makes alot of sense...i always thought to mess with the biss screw you had to activate the speed adjustment screw mode in evoscan and make the adjustments then...didnt know you could just turn the screw without it...good to know...thx brother...now, lets see how this works with gsc s2 cams...if my car wasnt in pieces id go outside right now...soon!...
Anyway, good luck! You definitely need the adjustment with a set of S2s.
#432
Evolved Member
iTrader: (17)
It works the same was as fuel trims. You want them closest to 0. Just like fuel trims, you don't want the ECU to have to be adding 15% or something.
You use the biss to zero the trim on the Ac OFF on. Then you use the ECU tables for the AC on demand to make the AC on trim perfect (if its off much).
Best way to do the idle/BISS
Last edited by Evo_Jay; Feb 23, 2019 at 04:14 PM.
#433
Evolved Member
iTrader: (17)
Just some info to add.
In evoscan, the value -1.17 is technically "zero" as this is where this ecu is after a reset.
I feel that anywhere from 0 to about +2 is fine. You don't have to rack your brain on getting it to be perfect 0 all the time. It will drift a lil (mine is always between 0 and +1.5 checking it for years)
Last, make your change, then wait. It takes some time for the trim to "settle' and if you keep making adjustments, you'll chase your tail forever, like Kaj mentioned. You may even wanna make a couple adjustments, get it close to zero, then drive the car for a day or two then check it again and if its between 0 and +2, you're ok.
Last edited by Evo_Jay; Feb 23, 2019 at 04:35 PM.
#434
Evolved Member
iTrader: (17)
biss screw north of the ticking lifters youve replaced 3 times but still tick...lol that had me crying haha...the video is perfect man...clear as day...makes alot of sense...i always thought to mess with the biss screw you had to activate the speed adjustment screw mode in evoscan and make the adjustments then...didnt know you could just turn the screw without it...good to know...thx brother...now, lets see how this works with gsc s2 cams...if my car wasnt in pieces id go outside right now...soon!...
But yeah, you will NOT use that mode to set your BISS using the trim way.
Last edited by Evo_Jay; Feb 23, 2019 at 04:16 PM.