Polar.C43

I've been eyeing the JB4 piggyback for the my 43 but as I was asking around I was bombarded with people telling me to "go to their guy" and that "the JB4 is very unreliable". Has anyone here with significant or little miles on their JB4 tuned C43 had ANY sort of issues with their tuned car? I always saw the JB4 as a very reliable option but not so much anymore...

MatthewJ

No issues here, been on for almost 2 years. Also havnt heard of anyone with problems from an engine standpoint. Some of the users had issues early on with switching from early gen JB1 modules to JB4 when the user would re-wire something incorrectly. But if you order through BMS directly you would get latest version with all that taken care of by them already.
Take a look at the BMS fourm for not just the C43 but any of the BMW or VW pages, not a lot of issues with it from what i can see. They are only tapping into a couple of sensors on the car so risk is minimal with the MB ECU safety features untouched.

TModelle

100% reliable. Set and forget.

munis

I would be very curious about who these people are who are telling you JB4 is unreliable. We have any entire whatsapp group of 50+ people with no issues other than installation errors.

RichardCranium3

Installed at 8k, rolled 35k miles last week. Zero issues.

Star4life

installed at 12k now at 25k, no issues at all. car is fast. 3.6 0-60 daily all year. faster in colder weather or if i push the tune harder. but i keep it pretty reserved. track it and all. no issues.

Boosted-b18c

What map are you running star4life ? Just curious

Polar.C43

Thank you guys for all the answers! I think you've convinced a new JB4 user!

BMS

The JB4 itself is super reliable and the only tuning option that can be removed without a trace and resold down the road. The problem is the JB4 isn't "the most profitable" thing for shops to sell. They make a lot more on flash maps that are 100% profit so a lot of shops talk down to the JB4. Just ask around and you'll find many hundreds of happy customers on this forum running it I'm sure.

Dieseldan9

iTrader: (1)

I have had mine for a few months and no issues.


I also had a vrtuned box before that and the car runs much better with jb4.

BMS

Thanks for the feedback!

Acradi02

I just bought the JB4 for my ‘18 C43.. would I be able to join the whatsapp group to read through any installation errors you all had?

user33

I think you mean that piggyback controllers are the only option that can be removed without a trace and resold down the road. That includes other piggyback products such as RaceChip.

I know of RaceChip installations that deliver considerable performance improvements, have been run for multiple years and have performed without having or creating any problems.

DLAMG_1979

Can someone add me to the JB4 Whatsapp chat? Just bought Luka's old JB4 off him last week.

Please PM me if you can!

BMS

RaceChip is like our old Stage1 tune that we no longer offer. I didn't include that in the discussion as it makes a lot less power.

Jmankoo1

Boosted are you the former owner of a 2011white c63 that is for sale at Mini dealership in Ramsey

was going to look at it today. Cheers...Jason

Star4life

map 0 or 2 in winter with 93 fuel. map 5 daily with e 40 in summer and sometimes 6 or 7 if its a good day for it temperature wise.

Jeremyc250

is there a chat I can be added to. I have a c450 with the jb4 tune and intakes

Don_Pippo

can you add me? 905-921-6888

skaura23

Can you add me also? I have 2017 c43 with jb4 and BMS intake

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