JB4 and facelift C43
04-16-2020, 08:06 AM
#1
Senior Member
Thread Starter
JB4 and facelift C43
Is anyone with a 2019 or 2020 C43 using an off the shelf JB4 piggyback system?
What are your impressions?
What are your impressions?
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1Gunner (04-17-2020)
04-17-2020, 10:07 AM
#3
Senior Member
Thread Starter
I'm curious why the JB4 system with wireless BT connection should even need a separate BCM, aside from the marketing up sell?
Why could they not just include tune maps that have added boost+?
Why could they not just include tune maps that have added boost+?
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1Gunner (04-18-2020)
04-17-2020, 01:22 PM
#5
Member
The issue is in the WGDC in the facelift cars. Despite the JB4 attempting to deliver more boost, actual boost was falling off. Trying to add more wouldn't have helped, but more importantly, if it DID work, you'd blow your motor. Rather than band-aid the issue, BMS asks people to add a BCM to get proper control over requested boost. You don't have to do it, you'll still get gains, but if you want the same gains as pre-facelift, it takes the BCM.
04-18-2020, 05:39 PM
#6
Senior Member
Thread Starter
The issue is in the WGDC in the facelift cars. Despite the JB4 attempting to deliver more boost, actual boost was falling off. Trying to add more wouldn't have helped, but more importantly, if it DID work, you'd blow your motor. Rather than band-aid the issue, BMS asks people to add a BCM to get proper control over requested boost. You don't have to do it, you'll still get gains, but if you want the same gains as pre-facelift, it takes the BCM.
04-19-2020, 06:24 AM
#7
Member
Yes and no basically. BMS followed the issue and offered a solution. It does suck that facelifts can't get he same gains with just the JB4, despite having larger compressors and a higher initial HP, but it's easy to fix.
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04-19-2020, 06:30 AM
#8
Arguably the facelift can’t get the same gains even with a tune.
04-19-2020, 12:06 PM
#9
Former Vendor of MBWorld
We're not thrilled the 2019+ models need extra tuning hardware to approach the pre-facelift models either but little we can do about it. We just tune the cars as they come. Blame Mercedes. 
Making the extra BCM add ons is a pain in the *** and we sell it close to our production cost.
Making the extra BCM add ons is a pain in the *** and we sell it close to our production cost.
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waisoserious (04-20-2020)
04-21-2020, 06:49 PM
#10
Senior Member
Thread Starter
We're not thrilled the 2019+ models need extra tuning hardware to approach the pre-facelift models either but little we can do about it. We just tune the cars as they come. Blame Mercedes. Making the extra BCM add ons is a pain in the *** and we sell it close to our production cost.
Making the extra BCM add ons is a pain in the *** and we sell it close to our production cost.I was told, by one of your Canadian re-sellers (Mike) that you (Terry?) had to set it up for a 2020. Is this accurate?
