Audi 90 1989
Engine code: AAN, with modifications
Years: 1992 - 1996
Type: 5-cylinder in line, turbocharged
Bore: 81.0 mm
Stroke: 86.4 mm
Valves: Four per cylinder
Displacement: 2226 cc
Modifications:
Compression Ratio:8.5:1 reduced from 9.3:1
Engine Management:Modified Bosch Motronic M 2.3.3
One ignition coil per cylinder
Cylinder selective ignition
Cylinder selective fuel mixture
Adaptive boost pressure control
Maximum boost pressure: 3.0 bar
Fuel pressure regulation: 4.7 bar over intake manifold pressure, up from 4.0 bar
Injectors: 25% increase in capacity
Mass Air Flow Sensor: Porsche Carerra RS
Intake manifold: Intended Acceleration cast magnesium & extrude honed
Allows for short path Audi S1 type intercooler
Exhaust Manifold: Intended Acceleration cast nickel header & extrude honed
Shorter & larger diameter runner tubes -- 5mm increase in outlet to turbo
Turbocharger: K26 - 3472 HHB 10.91 Manufactured by KKK
similar to that used on US IMSA-GTO 620 hp engine, but now with water cooling, tighter clearances, and newly designed polygonal shaft for
higher rpm limits (will not fit on stock manifolds)
Air Induction: Sport quattro intake hoses
Air filter: Modified Audi/Porsche RS2
Exhaust: 3" stainless steel from turbo back
Muffler: Two 3" stainless steel racing mufflers
Horsepower:510 (reduced to 430 hp now as higher hp bent stock rods)
Drive Train:
Flywheel: Aluminum, weight 11 pounds
Clutch: 8 carbon kevlar pucks (rated 750-850 hp)
Final Drive: Quattro drive train with 4.11 ratio gears
Transmission: Audi CBL 6-speed
Ratios 1st through 6th (3.5, 1.89, 1.32, 1.03, 0.86, 0.73)
Driveline: Modified to fit
Other Modifications:
Poly-ribbed accessory belt abandoned in favor of individual belts
Engine mounts shift engine to left (for larger turbocharger clearance)
Transmission mounts
Shift linkage
3 inch 321 stainless steel downpipe
Radiator cowling increased for 300 watt four-blade fan
Audi/Porsche RS2 oil pan with Intended Acceleration baffling
Audi 200 water manifold
Audi/Porsche RS2 radiator/turbo coolant hose
1989 Audi US IMSA-GTO rear wing
Audi/Porsche RS2 type body for S1 type intercooler
European model Porsche 993 fog lights, turn signal & side lights
Group A shock absorbers
Audi 200 hydraulic pump for power brakes
Audi 200 harmonic balancer
Relocated battery
Scheduled future modifications:
Increase displacement to 2.5 liter
Upgrade to 4" exhaust
Wheel bearings, bearing carriers, and hubs from Audi/Porsche RS2
Alcon composite aluminum brake rotors
Increase size of fuel lines
17" wheels
Paint: Ginster Gelb (Yes, an original factory yellow!)
Painted By:Ron's Auto Body Shop
Olympia, Washington
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