Session log · 4 September 2026
An E55 AMG, three pulls, nothing tidied up
A real session off our Dynojet 224xLC: a Mercedes-Benz E55 AMG on the rollers, published exactly as it was recorded. The owner's details are not here. The numbers and the conditions are.
How to read this graph
Two traces, one horizontal axis. The horizontal axis is engine speed. The amber trace is horsepower; the blue trace is torque in pound-feet.
They always cross at 5,252 rpm, on every dyno graph ever printed, because horsepower is just torque multiplied by rpm and divided by 5,252. If a graph you have been shown does not cross there, the axes have been scaled to flatter something.
Torque peaks early here, 586.92 lb-ft at 3,240 rpm, and power keeps climbing to 510.64 hp at 5,620 rpm because engine speed is still rising faster than torque is falling away. That shape is what makes a car feel strong in traffic rather than only at the top of third.
It is also the shape you would expect from a supercharged M113K. A blower makes boost in proportion to engine speed rather than waiting on exhaust energy, so the torque arrives almost immediately and the curve is a broad plateau instead of a spike. Every figure here is measured at the wheels, because a chassis dyno cannot measure anywhere else.
Run log
Every pull, including the slow ones
Three consecutive baseline pulls on the same car, in the same hour. The spread between them is the honest part: heat builds in the intake and the coolant between runs, and the numbers move. A shop that only ever shows you its best pull is showing you its luckiest one.
This was recorded before cooling upgrades, which is the whole reason the third pull matters as much as the first. More before-and-after sessions go up here as they are run.
| Pull | Peak HP | @ RPM | Peak lb-ft | @ RPM | Air temp | Humidity |
|---|---|---|---|---|---|---|
| Run 01 | 510.64 | 5,620 | 586.92 | 3,240 | 91.62°F | 61.47% |
| Run 02 | 478.42 | 5,200 | 571.31 | 3,410 | 91.63°F | 61.47% |
| Run 03 | 498.75 | 5,180 | 583.75 | 3,300 | 92.52°F | 58.59% |
Conditions
Why the weather is on the sheet
Air density decides how much oxygen goes through the engine, so the same car makes different numbers on different days. Correction factors exist to normalize for that. SAE is the standard one, and this session was corrected by a factor of 1.05.
A 5% correction is not unusual for a Central Texas afternoon at 92°F and 61% humidity. It is also exactly the kind of number that gets quietly swapped for a more generous standard when a shop wants a bigger headline. Ours is printed on every sheet we hand over.
91.62°F
Air temperature
29.44inHg
Barometric pressure
61.47%
Relative humidity
1.05SAE
Correction factor
The shop
Where it happens
Want your own sheet?
A baseline session tells you where the car really is. Everything after that is a decision you get to make with numbers.