M5 E39 Dyno test pre Supercharger install

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2 years ago
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bmw m5 e39 dyno tune test

Dyno'ed the M5 E39 before supercharger install. The car has 182,000 miles or 292,000 kilometers on odometer.

The motor dyno'ed at 379hp on Superflow Dyno.

In regards to WHP, the machine dyno'd at:
318.72 SAE (USA) WHP
323.15 DIN (Euro) WHP

The video shows max power moment @ 6580RPM, the Wheel Torque @ 344.9NM which is 254.4 ft lbs.
Then taking the imperial measurement system (ft lbs) way of calculating WHP from Wheel Torque and RPM:
EngineTorqueFootLBS times RPM divided by 5252: 318.72 HP SAE
SAE HP to DIN HP = x1.0139
318.72 SAE WHP x 1.0139 = 323.15 DIN WHP

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The only sensors replaced in last 150,000 miles are MAF. Everything else is original and no other performance improving mods have been done to the motor.

The oxygen sensors were reading a perfectly steady 1.0, meaning no compensation was necessary and engine/systems were working perfectly on all 5 dyno runs.

The 379hp max power were achieved at 200.5km/h @ 4th gear and on 5th dyno run, as the stock cats needed to be heated up and each consecutive run gave better readings. The ambient temp outside was 16c and inside Dyno shop about 20-22c.

The car lost ~20hp in last 180,000 miles/292,000km- down from 400hp to 379hp. 5% loss in almost 300,000km of hard driving.

Overall I'm satisfied and right in-line with what my M5 mechanic Maris Rungis @DriftDarbnica predicted (378hp, when I asked him to place the bets) before the Dyno run.

End of video shows clip where we did a €2 coin balancing test on the M5 motor to check for vibrations. Stands still and the minimal €2 sway is from the belt-fan air passing by.

Next up is crankshaft balancing, new rod bearings & chains/guides, sensors/grommets/gaskets/o-rings/et. al. replacement and refreshment before charger install. After refresh probably will have PedM5 from M5Board tune the ESS supercharger to perfect tune. Also I'm not doing myself the M5 rod-bearings & ESS install, but two ladies @ Drift Darbnica. Will film for viewing pleasure.

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