Jb+ 100% harsh downshift

derin11 · 02-04-2010, 06:49 PM

I just noticed this today but when im coming to a complete stop the car jerks down into first. at first i thought it was my brakes when i was coming to stoplights but its the gear changing

twinship · 02-04-2010, 10:04 PM

Auto trans?

Mine downshifts into 2nd at a stop, not 1st.

Not sure how/if the JB+ would be related...?

ianthegreat · 02-04-2010, 10:36 PM

Doubtful that is JB related..

JerzeySux · 02-04-2010, 10:54 PM

JB+ drives so much better at 75% than 100%. I know you probably get more power at 100% but at 75% it drives so much smoother and more "correctly".

geneatals · 02-04-2010, 11:24 PM

Quote:

Originally Posted by JerzeySux

JB+ drives so much better at 75% than 100%. I know you probably get more power at 100% but at 75% it drives so much smoother and more "correctly".

UberClean · 02-05-2010, 01:33 AM

i had hard shifts but when upshifting, brought it into the dealership, they did a transmission software update and the problem was completely fixed so you may wanna try that route i see your an 07 also.

derin11 · 02-07-2010, 05:47 PM

"JB+ drives so much better at 75% than 100%. I know you probably get more power at 100% but at 75% it drives so much smoother and more "correctly".

is this true?

blaze739 · 02-08-2010, 12:01 AM

Quote:

Originally Posted by derin11

"JB+ drives so much better at 75% than 100%. I know you probably get more power at 100% but at 75% it drives so much smoother and more "correctly".

is this true?

i believe it. i jumped from 55% straight to 95% and i noticed a huge difference in smoothness. i put it down to 75% immediately because i really didnt like the fell of the car

Nutballa · 02-08-2010, 12:45 AM

Never had this problem at 50%, 75% or 100%. My adaptation period was long. These Adjustments took place for 2 and half months. What about yours?

derin11 · 02-08-2010, 03:11 PM

Ive had it at 50% for 2 months then 2 weeks ago I cranked it up to 100% although I can't remeber IF it was still jerky at 50%

Mike@N54Tuning.com · 02-08-2010, 03:16 PM

At the higher settings you start working against the ECU. Doing the free solenoid bypass can smooth things out and really improve response time. It's no JB3, but better than JB+ alone at higher settings IMHO.

Mike

02-04-2010, 06:49 PM	#1
derin11 First Lieutenant 74 Rep 333 Posts Drives: 2007 bmw 335i sedan Join Date: Dec 2009 Location: San clement, ca iTrader: (2)	Jb+ 100% harsh downshift I just noticed this today but when im coming to a complete stop the car jerks down into first. at first i thought it was my brakes when i was coming to stoplights but its the gear changing
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02-04-2010, 10:04 PM	#2
twinship Booosted 48 Rep 832 Posts Drives: 2008 335i Join Date: Nov 2009 Location: Los Angeles iTrader: (3) Garage List 2008 335i [0.00]	Auto trans? Mine downshifts into 2nd at a stop, not 1st. Not sure how/if the JB+ would be related...? __________________ 2008 BMW 335i//Jet Black on Black Dakota Leather//Steptronic, Sport Package, Premium Package, Logic7 Sound, Aluminum Trim, iPOD & USB, Cobb S1+ Sport, ER FMIC, ER CP, K&N Filter, H&R Sport Springs, Koni Yellows, ECS Tuning spacers (F-10mm/R-15mm), Akebono pads, OEM Rear Aero Spoiler, OEM Sport Diffusor, Cyba 3.8" Tips, OEM Aluminum Pedals, M-tech Steering Wheel, Clear Reflectors
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02-04-2010, 10:36 PM	#3
ianthegreat Colonel 63 Rep 2,314 Posts Drives: n54 Join Date: Apr 2008 Location: Pittsburgh/Houston iTrader: (1)	Doubtful that is JB related..
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02-04-2010, 10:54 PM	#4
JerzeySux UrMother 38 Rep 639 Posts Drives: 335xiE92 Join Date: Aug 2009 Location: NJ iTrader: (7)	JB+ drives so much better at 75% than 100%. I know you probably get more power at 100% but at 75% it drives so much smoother and more "correctly". __________________ My Car drives on Sour Diesel and Haze. Dutch and Green Palma's for Octane Boost Poor Man's BMW Owner.
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02-05-2010, 01:33 AM	#6
UberClean Enlisted Member 0 Rep 41 Posts Drives: BMW 335i Join Date: Nov 2009 Location: South Florida iTrader: (0)	i had hard shifts but when upshifting, brought it into the dealership, they did a transmission software update and the problem was completely fixed so you may wanna try that route i see your an 07 also.
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02-07-2010, 05:47 PM	#7
derin11 First Lieutenant 74 Rep 333 Posts Drives: 2007 bmw 335i sedan Join Date: Dec 2009 Location: San clement, ca iTrader: (2)	"JB+ drives so much better at 75% than 100%. I know you probably get more power at 100% but at 75% it drives so much smoother and more "correctly". is this true?
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02-08-2010, 12:45 AM	#9
Nutballa Captain 256 Rep 840 Posts Drives: BMW F13 M6 // BMW F22 M235i Join Date: Sep 2008 Location: Austin, Texas+ San Antonio iTrader: (1)	Never had this problem at 50%, 75% or 100%. My adaptation period was long. These Adjustments took place for 2 and half months. What about yours? __________________ BMW FTW! "Power is nothing without Control" - Pirelli.
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02-08-2010, 03:11 PM	#10
derin11 First Lieutenant 74 Rep 333 Posts Drives: 2007 bmw 335i sedan Join Date: Dec 2009 Location: San clement, ca iTrader: (2)	Ive had it at 50% for 2 months then 2 weeks ago I cranked it up to 100% although I can't remeber IF it was still jerky at 50%
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02-08-2010, 03:16 PM	#11
Mike@N54Tuning.com Joint Chiefs of Staff 5044 Rep 116,174 Posts Drives: 2007 335i, 2015 M3 Join Date: Dec 2008 Location: N54tuning.com iTrader: (89)	At the higher settings you start working against the ECU. Doing the free solenoid bypass can smooth things out and really improve response time. It's no JB3, but better than JB+ alone at higher settings IMHO. Mike
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