michail71

Just venturing over here as I have a W205 loaner while my W204 is in the shop but was curious if this is normal. Under full throttle and in Sport mode it sometimes feels like the car barks or momentarily chokes while up shifting. Is this normal? I'm not sure if it's the rev limiter kicking in or something else. There is a loud sound with a monetary loss of power when the car shifts.

Even though, being a loaner, it's not well optioned I'm really enjoying the car. However, I'm not completely sold on some of the design changes. I'd like to pick and choose a few things between the W204 and W205.

topsider

in S+ mine does the same thing, i asked and mercedes said its a "sporty" feeling. lol

rbrylaw

I'm not a very aggressive driver, so I've not noticed this, but it makes me wonder if you're describing turbo lag?

michail71

Possibly, if the RPMs drop too much. But I'm rather used to turbos and have never seen anything like this. I may have been in S+ at the time.

Both times I was pulling out into heavy traffic. I don't usually make a habit of this myself. I'm also driving someone's future car. So I don't want to abuse it too much, lol.

It reminds me a bit of a fuel cut. But the barking sound seemed to have come from the back of the car.

topsider

its not turbo lag, it is programmed in to work like that in S+, believe me. I was told about it while in Germany visiting the Mercedes museum in 2014. For some reason they describe a jerky shift in S+ as "sporty. I drive in S+ every time merging on the the highway and I feel this every time, it is not uncommon

michail71

Thanks for the info.

Still very curious about what is going on and what that sound is.

topsider

the sound is a tiny amount of excess fuel exploding in the exhaust system. My two previous GTI's did it as well. AMG's do it, M's do it, fast audi's do it. the sound is meant to be enjoyed haha

michail71

Ah, that sounds reasonable. I had a GLI Stage 2 but it was also a manual transmission. Perhaps the slower shifting prevents it from happening.


Now that I know I will enjoy it.

ManiacGT

I rarely drive my c200 (same engine but detuned) hard but decided to today and know what you mean OP, burping from exhaust on up shift and slight ******/shift shock/drivetrain shock.

Would sound nice with a louder exhaust... My BMW Z4 35i has an amazing noise compared, albeit a remap per has ruined the car to be a non starter now and I'm in a legal battle soon no doubt

michail71

Sorry to hear about that. I was going to ask if you can flash the C200 to C300 or better?

ManiacGT

You can. But after my latest experience I'll be leaving it well alone.

michail71

I figured that.

What happened to the BMW flash? Did the ECU go bad or did it blow the engine?

Going by memory I think AMG pushes something over 350 HP out of the 2.0 turbo with a few upgraded internals.

ManiacGT

They bricked the ECU and blame me as a Bluetooth call came in during the flash. I suspect a voltage drop as their battery booster wasn't working (none of this my fault) but it seems I may have to proceed legally as they deny liability which is clearly wrong.

Maritime

Hm, isn't it their duty to know of, or foresee the call?

ManiacGT

Well that's my feeling yes. I simply don't understand the logic of denying it.

Maritime

Well, I'm in the U.S., where litigation is king.

michail71

You would think paying higher prices to professionals comes with some sort of guarantee. But that often doesn't seem to be the case.