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2010 2011 BMW 5 Series Forum F10 F10 Technical Topics Engine, Transmission, Exhaust, Drivetrain, ECU Software Modifications Jb4 jerk
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      07-05-2013, 02:03 PM   #1
ajandhek
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Jb4 jerk

Ever since I put my jb4 in the car is def quicker but when I turn the AC on the car tends to jerk at low rpm when I start hitting the gas..is this normal? Also happens sometimes when I put a diff brand of gas bp or exxon..and yes I put 93 octane
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      07-05-2013, 06:40 PM   #2
KRUZNM3
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hmm thats weird, when i had mines i had no issues with it... how long have you had it installed for?
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      07-05-2013, 07:05 PM   #3
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sometimes i feel a quick jerk(lol) when i go WOT. Itll start pulling then all of a sudden it jerks for a quick sec and pulls again.
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      07-05-2013, 10:18 PM   #4
ajandhek
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Had it for a few months
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      07-06-2013, 04:54 AM   #5
oldrandomguy
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It is completely normal. You are tricking the car into thinking you are higher up in atmosphere so when you switch gears, it dumps boost and then builds it up again.
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      07-06-2013, 12:45 PM   #6
ajandhek
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Ya but is normal good
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      07-06-2013, 07:01 PM   #7
oldrandomguy
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If my 4 banger project car VW turbo is able to be jerked around like on a rope, a little jerk on gear changes in a beefy BMW is going to be no problem.
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