JB4 in the mail
Thread Starter
Junior Member
Joined: Jan 2018
Posts: 19
Likes: 2
2020 C63 AMG
JB4 in the mail
Good day gentlemen , currently have the jb4,bcm and Bluetooth wireless in the mail. I need honest opinions about jb4 on a 2020 C63 I know people will say should of just flashed the ecu and cpc or whatever but I just don’t find it necessary to drop 5k with euro charge in Houston for 120 hp they claim more but my budddy got it and he only went to 550 hp and a little below 600 tq on stage 2 so Im trying the jb4 out before I do anything big. Advice ?? Opinions on jb4?
Junior Member
Joined: Jun 2021
Posts: 33
Likes: 13
From: Virginia
C63s
No experience with JB4 and 2020 C63, but I have JB4’s sitting around my garage from previous 2017 M4 and 2017 911 installs. They became expensive paperweights. On both those cars I ended up getting a flash tune within 2-4 months of installing the JB4. To me, JB4 didn’t perform nearly as well as a proper ECU flash tune. Not to mention the pain of install/deinstall for dealer service.
I have RennTech stage 1 on my 2021 C63s and I really notice and enjoy the power delivery, overall performance and ease of install/deinstall.
I have RennTech stage 1 on my 2021 C63s and I really notice and enjoy the power delivery, overall performance and ease of install/deinstall.
Last edited by Omega4; Apr 28, 2023 at 03:55 AM.
Junior Member
Joined: Nov 2012
Posts: 66
Likes: 22
From: Reno, NV
2021 AMG C63S, 2025 AMG GLE 53
No experience with JB4 and 2020 C63, but I have JB4’s sitting around my garage from previous 2017 M4 and 2017 911 installs. They became expensive paperweights. On both those cars I ended up getting a flash tune within 2-4 months of installing the JB4. To me, JB4 didn’t perform nearly as well as a proper ECU flash tune. Not to mention the pain of install/deinstall for dealer service.
I have RennTech stage 1 on my 2021 C63s and I really notice and enjoy the power delivery, overall performance and ease of install/deinstall.
I have RennTech stage 1 on my 2021 C63s and I really notice and enjoy the power delivery, overall performance and ease of install/deinstall.
Junior Member
Joined: Jun 2021
Posts: 33
Likes: 13
From: Virginia
C63s
Member
Joined: Jan 2021
Posts: 107
Likes: 6
C7 Z06
Reviving ld thread, sorry.
On the JB4 installation, did you guys install 4 or 6 plugs for sensors?
There were 2 each side in the front under that black pain in the ***, no slack shroud (the cause of the misery of the installation) and 2 real easy ones on the side of the engine towards the back half.
I did all 6 and have a CEL and des. They;re teling me now to uninstall 2 of the fronts now.
On the JB4 installation, did you guys install 4 or 6 plugs for sensors?
There were 2 each side in the front under that black pain in the ***, no slack shroud (the cause of the misery of the installation) and 2 real easy ones on the side of the engine towards the back half.
I did all 6 and have a CEL and des. They;re teling me now to uninstall 2 of the fronts now.
Member
Joined: Jan 2021
Posts: 107
Likes: 6
C7 Z06
Reviving ld thread, sorry.
On the JB4 installation, did you guys install 4 or 6 plugs for sensors?
There were 2 each side in the front under that black pain in the ***, no slack shroud (the cause of the misery of the installation) and 2 real easy ones on the side of the engine towards the back half.
I did all 6 and have a CEL and des. They;re teling me now to uninstall 2 of the fronts now.
On the JB4 installation, did you guys install 4 or 6 plugs for sensors?
There were 2 each side in the front under that black pain in the ***, no slack shroud (the cause of the misery of the installation) and 2 real easy ones on the side of the engine towards the back half.
I did all 6 and have a CEL and des. They;re teling me now to uninstall 2 of the fronts now.
