OlegO

I have 2008 C300 sport sedan with 57k miles (all maintenance/fluids/filters up to date)
My friend has 2008 C300 sport sedan with 137k miles (not maintained as well as mine)

I've taken both cars on many long road trips

My C300 definitely feels less responsive to throttle input. I notice it as soon as I get into my car, there is absolutely no doubt about it.


The best way I can describe it is... it feels like I have two big guys in the back seat with me at all times
OR as if my car has much taller gearing


Is it possible that these cars actually came with different gearing ratios?

Alfadude

If you are talking about the responsiveness it could be your driving style. Maybe resest the TCU. Do do a search on here and you should be able to find the procedure to do that. Your car "learns" your driving style and after many miles it might default to more of a "leisurely" throttle inputs and shift points.

95Sinned420

bowenxue98

By slow do you mean in terms of performance or responsiveness? The only way to test if its actually slower is to race his C300 head to head. Otherwise, reset the TCU and see if it "feels" faster. I can't speak for the feel of driving the car as that is very subjective, and after the reset you may still think it's slow due to placebo.

OlegO

Wow! I didn't even think about the TCU adapting and that potentially being the issue here.

Both above mentioned C300s seem to accelerate about the same with the pedal to the metal.
It's really the partial throttle response at lower rpm that is REALLY sluggish in my car.

I've always driven C300s in Sport mode, never Comfort.

So I am going to do the TCU reset. From what I understand it's - key in pos2, throttle to the floor for 10sec, key in OFF, release throttle, dont start engine for at least 2 minutes.

Adi-Benz

pretty much, I would suspect its the tcu adaptation as well.

xsever

Let us know what happens after the reset.

Laxpower87