C400
Member
Joined: Oct 2016
Posts: 110
Likes: 14
M3
Use the search function, this has been asked dozens of times. If for some reason you don’t want to do that, maybe just form a complete sentence. Throw some punctuation in there, or at least a question mark. If you don’t want to make the simple effort, why would anyone else want to make the effort to help you? Fr.
MBWorld Fanatic!
Joined: Oct 2018
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Likes: 820
From: Florida
2018 AMG E43
For mods it depends on what you want to do, tons of options out there.
For tuning I would recommend an ECU tune and would probably stay away from piggybacks or boost controllers. At least in my experience, I've found things like boost controllers underwhelming.
I'm planning to do a ECU tune of my M276 V6 in the near future and I'll most likely be going with Eurocharged. You can get a canned tune from them with a handheld OBD flash ECU programmer to do it yourself or if you live near one of their service centers you could get an on-prem dyno tune by them.
Good luck and enjoy the new ride!
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Joined: Nov 2017
Posts: 81
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From: Chicagoland
C400
I have a c400, as well. I am on eurocharged stage 1, with a JB4 on map 6, running 21 psi peak. The last time I was at the track, I forgot to put my car in dyno mode, so I was definitely launching much softer than what was possible. On 8 runs or so, I ran between 12.2 and 12.26s all day on a hot summer day.. my 60ft times were very bad from traction control limiting torque at launch. I hope to break into the high 11.90s. I've been running this setup for 2 years. I routinely get 30mpg on my way home from work in eco mode. I have to drive carefully to get those mpg, though. I go to the track with friends who have an srt392 scat pack charger and an m550i. I am the culdesac champ in the 1/4 and mpg. It infuriates them. 
Get your stage 0 maintenance done and have the car checked out before you start adding power. I ran neck and neck with a w205 c63s from a roll (he did pull ahead at the end) and I think at the track, with a good launch, I would beat a stock w205 c63s. Take all of this at your own risk (except the stage 0, you should do that no matter what) and get in touch with BMS to review logs. They were instrumental in my JB4 map 6 adjustments. Hope this helps.
Get your stage 0 maintenance done and have the car checked out before you start adding power. I ran neck and neck with a w205 c63s from a roll (he did pull ahead at the end) and I think at the track, with a good launch, I would beat a stock w205 c63s. Take all of this at your own risk (except the stage 0, you should do that no matter what) and get in touch with BMS to review logs. They were instrumental in my JB4 map 6 adjustments. Hope this helps.
Last edited by GJC400; Aug 30, 2023 at 09:22 PM.
