Recentely peformed a dyno test on my A4 1.8T.so that I could compair afterward with the chip I order. I was suprised to find out that it only had 115 hp. and not 150hp. Does anyone have a clue what is wrong?

What rpm was the 115 recorded at? Did you go through the rpm scale or did it max out at 115? Jeeze - sounds wierd. I'll be watching your post for answers...

Sorry-hit the enter key too quickly-hardly sounds unreasonable for a rear wheel power figure using the usual 20% parasitic driveline loss.How the quattro handles the power distribution in this situation (on a chassis dyno) is the real question.You didn't really expect 150HP at the tires did you?

In a 2WD car, you normally expect 15% loss with a stick, 20% with automatic.

Check the turbo hoses. My car came with faulty hoses and the leack caused a loss in power

The number that you got from the Dyno was most likely HP at the wheels. Manufacturers quote power of the engine, not the power delivered to the wheels. (If you ask me that is stupid and unreasonable.) Usually you can expect 15% to 25% power loss on its way from the engine to the wheels. I expect that quattro makes that number worse. I assume that you have a FWD, so 115HP * 1.15 = 132.25 or 115 * 1.20 = 138. Still little low, but definately in range.

Also, you should perform the comparison on the same EXACT day. Dyno numbers taken today will not compare to numbers taken tommorrow. Weather has great impact (withing 15%) on engine power.

Tomasz

If 115HP was already adjusted for power at the engine, then your turbo is most likely dead. Bring your car to the dealer.

The figures posted state 150 HP @ 5500 RPM. HP is a function of torque*RPM

Basics:

1 horsepower is 550 ft*lbf/second
Torque is measured in ft*lbf
RPM is measured in revolutions/minute
1 minute is 60 seconds
1 revolution is 2*Pi(3.141592...)radians

therefore 1 HP is [torque*(rpm/60)*2*Pi/550

The 1.8t engine develops 155 ft*lbf torque from 1750 to 4000 rpm. At 1750, its developing 51 HP!

The published figures for hp by the manuf. are flywheel (engine) hp numbers. Chassis dynos provide the actual hp at the wheels. This number is usually lower than the flywheel hp due to parasitic loss from the drivetrain. Typicall conversions between flywheel and wheel hp is 15% loss for manuals and 18-20% for automatic transmissions.

Assuming you have a manual (15% drivetrain loss) the calculations would be 115/.85 = 135.x

Automatic: 115/.80 = 143.x

So you appear a little off, but there are many possible reasons for that (heat soak if you were driving alot beforehand, timing retard, air temperature etc.).