jb4 adapting - BMW 3-Series (E90 E92) Forum

abhishriv · 05-10-2012, 08:36 AM

i recently installed the jb4 on my car about a week ago and love it! problem is that most of my weekday driving is to and from work in slow traffic, so i set the jb4 to stock bypass (map 0) for most of the time. however, ive been reading on here that the jb4 takes a while to adapt to the car, should i keep the jb4 on map 1 or 5 and leave it on?

farbmw · 05-10-2012, 08:41 AM

If I remember correctly map 5 is auto-tune, so you should be good using it on that map.

abhishriv · 05-10-2012, 08:53 AM

Quote:

Originally Posted by farbmw

If I remember correctly map 5 is auto-tune, so you should be good using it on that map.

yea it is the auto-tune map.. but im wondering if i need to leave it on this map constantly for a set amount of time for my car to adapt to the jb4. because right now i keep turning it off and on depending on if im stuck in heavy traffic or have nice open road ahead of me.

Mike@N54Tuning.com · 05-10-2012, 08:56 AM

Quote:

Originally Posted by abhishriv

yea it is the auto-tune map.. but im wondering if i need to leave it on this map constantly for a set amount of time for my car to adapt to the jb4. because right now i keep turning it off and on depending on if im stuck in heavy traffic or have nice open road ahead of me.

Map5 requires a few hard pulls to fully dial in. I would just leave the JB4 on all the time

Mike

san6279 · 05-10-2012, 08:58 AM

My understanding is Map 5 does not "remember" anything through a shutoff event. Autotune starts all over again.

farbmw · 05-10-2012, 08:59 AM

Quote:

Originally Posted by abhishriv

yea it is the auto-tune map.. but im wondering if i need to leave it on this map constantly for a set amount of time for my car to adapt to the jb4. because right now i keep turning it off and on depending on if im stuck in heavy traffic or have nice open road ahead of me.

On the old unit (JB3) it needed time to adapt because of the slow processor, the reason why it did not have auto-tune.

But the JB4 has a faster processor and can do auto-tune, so it does not need to adapt because the processor is quicker.

abhishriv · 05-10-2012, 09:15 AM

Quote:

Originally Posted by Mike@N54Tuning.com

Map5 requires a few hard pulls to fully dial in. I would just leave the JB4 on all the time

Mike

im guessing a full hard pulls means 2nd or 3rd gear WOT to 6k rpm? think ill do it tomorrow as i'm getting my new brakes installed and will have to break those in as well on some long empty road; constantly accelerating and braking hard. haha i've left jb4 on for the past 2 days and i feel im going to get into trouble with the cops very soon :P

themyst · 05-10-2012, 09:23 AM

Problem I have with map 5 auto tuning is it will detect traction related timing drops as knock and also flatline as knock. IMO the logic needs to be tweaked or disabled unless the autotune uses CPS to fine tune along with boost.

Already provided this feedback to Terry.

Eracer76 · 05-10-2012, 10:07 AM

If you upload the new alpha firmware that Terry is testing, the JB4's new learning logic is enabled on all the maps but is only used for boost targeting on map 5, and it does not reset itself when switching maps.

And BTW, the new map 5 while running 30-40% E85 mixed in with 93 pump gas is insanely fast and very smooth!
I'd say its every bit as quick as the older map 3 even when running meth!

jetbill · 05-10-2012, 10:36 AM

Quote:

Originally Posted by themyst

Problem I have with map 5 auto tuning is it will detect traction related timing drops as knock and also flatline as knock. IMO the logic needs to be tweaked or disabled unless the autotune uses CPS to fine tune along with boost.

Already provided this feedback to Terry.

Wow, that's some pretty good feedback.

05-10-2012, 08:36 AM	#1
abhishriv Major Drives: 2007 335i Coupe (Space grey) Join Date: Oct 2011 Location: Toronto Posts: 1,093 iTrader: (0)	jb4 adapting i recently installed the jb4 on my car about a week ago and love it! problem is that most of my weekday driving is to and from work in slow traffic, so i set the jb4 to stock bypass (map 0) for most of the time. however, ive been reading on here that the jb4 takes a while to adapt to the car, should i keep the jb4 on map 1 or 5 and leave it on?
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05-10-2012, 08:41 AM	#2
farbmw Brigadier General Drives: 2008 335i gone 2011 335IS owed Join Date: Aug 2009 Location: Toronto Posts: 3,287 iTrader: (10)	If I remember correctly map 5 is auto-tune, so you should be good using it on that map. __________________ Have BT Tool professional, will scan and clear codes on your BMW. And now I am able to code my 2011 335is!

05-10-2012, 09:23 AM	#8
themyst Major General Drives: E90 335i LCI Join Date: Feb 2009 Location: NYC Posts: 6,349 iTrader: (8)	Problem I have with map 5 auto tuning is it will detect traction related timing drops as knock and also flatline as knock. IMO the logic needs to be tweaked or disabled unless the autotune uses CPS to fine tune along with boost. Already provided this feedback to Terry. __________________ E90 LCI N54 6AT

05-10-2012, 10:07 AM	#9
Eracer76 Second Lieutenant Drives: 2008 E92 335xi Join Date: Nov 2011 Location: IL Posts: 234 iTrader: (5)	If you upload the new alpha firmware that Terry is testing, the JB4's new learning logic is enabled on all the maps but is only used for boost targeting on map 5, and it does not reset itself when switching maps. And BTW, the new map 5 while running 30-40% E85 mixed in with 93 pump gas is insanely fast and very smooth! I'd say its every bit as quick as the older map 3 even when running meth! __________________ Click>> 2008 BMW 335xi E92: 11.988 @ 114.080 MPH BMS JB4 G5, WW meth kit, OCC ~ Stett CAI ~ Helix FMIC ~ ER Charge Pipe w/Tial BOV ~AR Catless DP~ Aero Front Lip ~ BMS LED Angel Eyes ~ Black Kidney Grills ~ Painted Lower Grills Painted Reflectors ~ Aluminum Pedals ~ 35% window tint ~ Painted Calipers/Rotors ~ KW V1 Coilovers ~ 19" Avant Garde M310's 235/35 & 275/30 G-Max AS-03 tires

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05-10-2012, 08:58 AM	#5
san6279 First Lieutenant Drives: 2007 335i Join Date: Sep 2010 Location: Seattle, WA Posts: 338 iTrader: (2)	My understanding is Map 5 does not "remember" anything through a shutoff event. Autotune starts all over again.