gesTTalt

at the flywheel? I know they are in Nm, but one can convert them to ft-lbs by multiplying by .737.

If the readings are at the flywheel, then how do you convert it to the wheels?

Question 2: on Blk 204, if your command pressure is 2190 mBar and your actual at the intercooler is 2530 mBar (translation: command is ~ 1.2 bar(17 psi) and intercooler is at 1.5 bar (22 psi)), what can be happening?

A friend who ported and polished the throttle body is getting pretty equal command and actual (approximately 2200 mBar ~ 1.2 bar) -> with APR, AireTek intake, and custom 4" cat-back exhaust.

Apaprently, the TB has a "bump" that impedes the air flow and makes you inefficiently enter cylinder 1, plus possibly causing a back up in at the intercooler (hence, the greater actual vs. command pressure). At least, this what I'm guessing.

john s

"The power P furnished by the spark ignition engine is determined by the available net flywheel torque and the engine speed. The net flywheel torque consists of the force generated in the combustion process minus frictional losses (internal friction within the engine), the gas exchange losses and the torque required to drive the engine ancillaries. The combustion force is generated during the power stroke and is defined by the following factors:
- The mass of the air available for combustion once the intake valves have closed,
- The mass of the simultaneously available fuel, and
- The point at which the ignition spark initiates combustion of the air/fuel mixture."

As far as the pressure difference, check your readings with the engine off. They should all read atmospheric pressure, as seen on block 113. Press on the gas pedal and the commanded pressure should go up to almost 1.3 bar but the manifold and turbo pressures should not change.

Agent911

1/
the exact values are not known. for FWD, the powerloss is 10-15% RWD ->12%-20% and AWD 20-27%.

around those area. our TT is really all FWD (including quattro) and only engages AWD when there is a slippage with something like 30~40% power to RWD and the rest to FWD.

2/
command is what ECU wants, and intercooler is actual boost. ecu will regulate wastegate solenoid to keep it at the desired boost, but chiped, different pipings (FMIC) and if polished - its not calibrated to the given conditions.

a stock ecu, and stock engine will be much closer to command boost.