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1.
The term used to refer to Volkwagen/Audi's 1.8 litre turbocharged gasoline engine. Features of the engine include:
-a cast iron cylinder block
-aluminum valve cover, oil pan, and crossflow intake
-dual overhead camshafts or DOHC (later revisions included a variable valve timing feature for performance/emissions control)
-5 valves per cylinder, three inlet and two exhaust
-individual ignition coils for each cylinder (no distributor)
-Sequential fuel injection
-drive-by-wire throttle control system

The engine came in several revisions:
transverse: AWD, AWW, AWP, APH/AVC , AWV, ATC, AGU, ARZ, AVJ, AUM, ARX, AWC, BJX, AJH, AQX, AYP, BVP, AJQ, APP, AUQ/ARY, BBU, BVR, APY, AMK, APX, BAM, BFV(240hp)
longitudinal: AMU, BEA, AEB, APU, AWT, BFB, AJL, BEX,

The fact that the engine was originally designed with the use of a turbocharger makes it very compliant to the introduction of higher flow aftermarket turbochargers and high boost with increased fueling. Simple software tuning can increase the engine output to 200+bhp and 250+lb.-ft. of torque. Changes to engine hardware can have the 1.8T engine producing over 300hp.
The cast iron cylinder block along with native forced induction and high compression ratio (9.5:1 stock) allow the 1.8T to produce high output from limited combustion volume.
by cookiehead2 April 17, 2008
 
2.
the 1.8T is the best engine that has evar been made, it's reliable, extremely fast and is great for mileage also. This beast is mostly found in the VW mk4 bodies but also Audi's, Skoda's and Seat's. rumour has it that Chuck Norris' heart is replaced with a 1.8T. The 1.8T can nevar loose.
"Whoa! Jimmy's Jetta has been running low 16's all day long!!!11!"

"Yeah baby, the 1.8T can nevAr loose! werd"
by Bobhelsinki April 26, 2008