I just got a '99 A4 1.8T Quattro (74000 miles, I absolutely love it)
to replace my '00 Passat 1.8T (43000 miles). I've noticed that the
Passat has much more "pop" than the Audi even though they have the
same engine. I realize that there is a 30000-mile difference between
My question is, what do I need to replace/repair to regain the
If he's in the US, both engines are rated at 150hp stock. What he's
observing is the additional power loss to the wheels inherent in the quattro
system. Also, because of the all wheel drive, hitting the gas pedal does
not result in such an abrupt "kick" or "pop" but is more smooth instead.
Also, the A4 1.8TQ is several hundred pounds heavier than a FWD Passat.
To the original poster: Assuming your turbo isn't blown, there isn't really
anything to regain. You could, however, purchase an aftermarket chip (ECU
programming) to increase torque/horsepower. Check out www.goapr.com and
www.giacusa.com if you're in the States.
Well, I would check the airmass sensor. Audi's Turbo Diesel Engines have
a design flaw with that, therefore the Diesel drivers know, that if the
airmass sensor goes, the power drops by some 20 HP.
I found problems with petrol engines and their sensor on the web, and
just for peace of mind I would check it out. The airmass sensor is not
in the telemetry of the OBD on the diesels, so I assume (sorry, no
better info) that it's not in the Diagnostic of the petrol engines
There are driving cycles with which an audi dealer can check if the
sensor is gone.
On the diesel you can actually unplug the sensor without damage
(although the engine goes into safe mode) and test drive to discern if
the engine works differently.
Maybe you can do the same on the petrol engine but I have not read about
it and I have no idea if it's dangerous for the engine.
I keep forgetting that I need to specify what country I live in on
I am in the US and both cars are 150hp. I have the GLS FWD Passat.
Both cars are gasoline. The Pasast weighs about 3073 lbs and the A4
3200 or so, so there is a minor weight difference.
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