Hello everyone!
So I've recently upgraded my C450 AMG. Here's the list: intakes, downpipes, exhaust, Weistec W.3 ECU tune, Weistec TCU tune, Weistec turbo impeller upgrade (stock turbos bored into big turbos), and a Weistec water methanol injection kit.
I've got a concern maybe some of you could address. The top end on my car MUCH stronger, but the sprint to 60 is leaving something to be desired. I've seen C43's with LESS work done to them achieving 2.9-3.1s to 60, whereas mine is still at around 4.1s (it was hitting 4.3x's before the big turbo work was done). This is Dragy tested on the street.
EDIT: I got a 4.09 last night. A negligible margin quicker, but quicker nonetheless. 86⁰ and humid. On level ground, and Dragy tested/timed.
These quicker C43's I'm seeing typically have intakes, downpipes, exhaust, ECU tune, TCU tune. I know C43's have 2 extra gears (9 speed), making the ratios a bit shorter and in turn the sprint to 60 as well, but with all this work done to mine I'm thinking I should also be somewhere in the low 3's - maybe 3.2-3.3 since my 7 speed gears are a bit longer. I feel as if something's off.
Something to bear in mind is that it's currently 95⁰+ and humid in my area. I know this negatively affects performance on a heavily modified and boosted car, but it shouldn't make a 0.8 second difference to 60. I could be wrong about that, though.
I'll be bringing the car back to the speed shop where I did all the work for data logging, but in the meantime I'm wondering if anyone knowledgeable about M276 W205 platforms knows something I don't about why my car is performing the way it is.
I also think if the 0-60 time is off by such a margin, there's likely significant gains still to be found in the top end, despite it feeling stronger than it was before.
EDIT: I have just noticed I never upgraded the spark plugs. Apparently HKS makes a spark plug kit for modified M276 motors, and their "1-step colder" plugs are for "stage 2+ and stage 3" cars pushing around or in excess of 550.
I'll be getting them regardless, but if anyone knows much much of a power loss this could actually cause I would love to know. Also, if there's anyone else with extensive M276 knowledge that can think of something else I'm missing that would still be much appreciated.