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N55 JB4 & Boost inconsistency Problems -
05-10-2019, 02:01 AM
hey guys,
First time posting in a forum. Usually, the rest of the threads were enough to cover my questions.  I recently bought a 2010 335ix, 90k kilometres, N55 engine(PWG). Last week I installed a JB4, which I managed to get to work last night. Never underestimate software updates people. Now lets jump straight to the issue. I have attached a video showing the strange behaviour of my engine after running on Map 1. Boost Bouncing Around.mov - Google Drive Boost is inconsistent, making me believe that there is a boost leak somewhere. However, when JB4 is disabled, the car runs butter smooth again. Could it be that my pneumatic wastegate is faulty? any input, advice appreciated. 
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(#2)
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05-10-2019, 06:16 AM
its pwg , so do expect a little more action on that part .
jb4 works best with a good BEF , and surely the pwg models 
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05-13-2019, 12:04 AM
Can you just upload the CSV direct?
Home of the JB4 the worlds most popular turbocharged tuning system! It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.
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(#4)
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05-13-2019, 05:41 AM
Thank you for the replies guys. I have been thinking about getting a BEF and it seems to be the best path to go once you're FBO. I just got a data cable for the jb4, i will be posting logs as soon as i have something.
Map 1 has been rough and unreliable on my 335. I tried running 102 octane fuel to see if power delivery will be smoother but no luck. I have now switched to map 5 and currently running the following settings on the JB4: (10)DWP set to 0 rpm, (11)Pedal input set to 0 rpm, (12)Base duty cycle to 3000 rpm. The car seems to be running more smoothly now. The above settings somewhat gave the linearity that the car is missing. I will be logging the car once i have the time and update the thread.
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