caza

Hi my C43 (2019) is lacking power, my 0-60 runs are constantly around 5.2secs which is weaker than anything I’ve seen and I can feel that the 30-60 is where the power is lacking. I know it because I’ve been driving C43s since 2017. The 0-30 is fine.

I get this time even when launching with foot on the brake and with the car empty.

I have an appointment soon for a transmission check (gear 2 and 4 having issues) what else can I point out to maybe fix this issue?

My tires are almost brand new, contisportcontact 5 SSR.

W205C43PFL

Sounds familiar:
https://mbworld.org/forums/c450-c43-...-no-codes.html

caza

Interesting, I’ll need to check later if my hp drops like him.

W205C43PFL

Keep us updated.

C43HeartBoost

I assume you logged this time with a reputable performance tracker, once the car was fully warmed up (all AMG gauges showing white), in Individual mode with all settings in Sport+ besides suspension set to “comfort”, with brake boosting to 2k to 2.2k. Assuming so, I agree the times are lackluster. If not, repeat using these instructions.

caza

I tried a couple times and I had no problems reaching 380-385hp, the only thing it was maybe a little slow to reach max hp.

W205C43PFL

I see thanks for the update at least now we know your battery is good.

W205C43PFL

How about boost pressure? Were you able to check that? Are you suspecting the transmission issues you mentioned the direct cause to the sluggish performance?

caza

actually my battery is always showing as “partially charged” in mercedes me app and I had a couple time a message saying that battery level is critical after letting the car on for around 30mins

caza

Boost goes all the way up.
My transmission sometimes fail to shift from 1 to 2 in time. It reaches the good rpm then I feel like the car isn’t accelerating for fraction of a second then shifts to the 2 and giving a hard hit, also the loud bang that usually happens from the exhaust doesn’t happen at all.
But that a rare case and when it shifts perfectly I still get the same time so

W205C43PFL

What is the voltage when fully charged and what is the voltage when engine is off?

W205C43PFL

Yup that transmission behaviour doesn't sound normal at all (despite the C43 having a quirky transmission) . Does the transmission slip at all?