Mercedes E250 came by seeking our assistance to diagnose several issues that it was plagued with after it was tuned by another local tuner who has minimal experience with continental makes. Owner claimed he felt that his car actually lost power after the tune.
We proceeded to dyno the car with road load simulation and it was making about 171hp and 296nm (at the crank est). We then removed the unichip and ran the car on the Dyno again to measure its stock power. It measured a shocking 173hp & 302nm. It actually made more power and torque without the tune. Here is the graph.
After all necessary data was collected, we went on to retune the car. And here is the result.
The car gained 18hp and a whopping 45nm extra more torque (at the crank est) over the previous tune. No CEL (check engine light), no DTC (diagnostic trouble codes), no boost cuts, no ECU failures etc. Just a good clean tune with good power delivery across the rev range.