Mercedes Benz A45 and CLA45 tuning, or how to scare Golfs.

A45 Performance Tuning

Merc’s go cart from hell.

With amazing amount of hot hatches on the market there one may get lost in options. However Mercedes was ignoring the hot hatch category until 2014. And boy did they get it right.

Spacious, nimble, maneuverable and well… Somewhat underwhelming. When we drove one many years ago the response was – Is that all? Really?

Germans idea felt a bit unfinished. Looking at hardware – everything was there. Decent engine, Decent size turbo, only minor restrictions. Excitement – not quite there. Yes, it had power, but only when would out to the redline, apart from that there was not a lot happening until 5000 RPM.

Solution came after a year of development. A45 and CLA45 tune that would improve the dreaded midrange.

Here are before and after Dyno graphs. Green is Stock Car, Purple is Tuned with catless downpipe and BMC Air Filter.

Tuned A45 Cla45
CLA45 A45 Dyno Stock vs Tuned WHP (Wheel Horse Power)
A45 Stock VS Tuned Derived Torque LB/FT (torque at wheels)

From the graphs you can spot where excitement comes from. Difference is 92nm of torque at the wheels. Closer to 110nm at the engine.

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