Differences between 7M-GE and 7M-GTE

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Traits & Components	7M-GE	7M-GTE
Induction	Naturally Aspirated	Turbocharged(stock 6-8psi)
Unique Components	ACIS - Acoustic Control Induction System	Check valve between surge tank and ISCV.
Air Flow Meter	VAFM - Vane Air Flow Meter (deflection meter system)	KVAFM - Karmann Vortex Air Flow Meter (optical meter system)
EFI Naturally both systems use different engine, engine bay, dash wiring harnesses and EMS.	One knock sensor between cyls 3 & 4	Two knock sensors: First between cyls 1 & 2; Second between cyls 5 & 6
Ignition	Single ignition coil w/ distributor	Multi-channel igniter, multi-coil (wasted spark*)
	CPS located in distributor	CPS without distributor.
Gauge cluster differences	Battery gauge, different tach circuit	Boost gauge, no batter, different tach circuit
Lubrication System	Lower volume oil pump same pressure as GTE pump.	High volume oil pump same pressure as GE pump.
	No oil cooling components.	Oil cooler (bypass, pressure regulated)
Additional Cooling Features		Oil squirters to cool pistons
		One additional 10" or 12" aux fan between the A/C condensor and the radiator.
		Turbo cooling circuits (oil and water)
Piston dish volume (this accounts solely for the difference in compression between the two engines)	9.5cc	19cc
Cylinder volume	40cc	40cc
OEM head gasket thickness	1.37mm	1.37mm
Compression	9.1:1 (My calculations show this should be a bit higher. Around 9.3.)	8.387:1
Cylinder bore	83mm	83mm
Stroke	91mm	91mm
Minimum Recommended Octane (AKI = R+M/2)	87 AKI or better (91 RON, 95 RON recommended)	91 AKI or better (97 RON)
Transmission	W58 (push type pressure plate), A340E	R154 (pull type pressure plate), A340E
End Gear	4.30:1	3.91 ('87-'88), 3.73 ('89-'93)
Fuel Pump	Intermediate flow	High flow
Fuel injectors	'86.5-'88 Low impedance: 260-320cc/m '89-'93 High impedance: 276-340cc/m (NOT interchangable**! Let the rumor of the later model injectors flowing over 20% more die already!)	'87-'93 Low Impedance: 404-456cc/m

*The GTE ignition setup uses three channels to control spark across all six cylinders. This is accomplished by what is known as "wasted spark". When the igniter is signalled to fire channel #1, for example, it actually sends a spark to cylinder #1 AND cylinder #6. While one cylinder is on its combustion the other is on its exhaust stroke... thus one spark is "wasted". The pairings are: 1 & 6; 3 & 4; @ & 5

**The '89 and later MKIII injectors may be used in earlier models by bypassing the injector pack on the driver's side fender. These injectors are most easily spotted by their green tops where earlier model injectors had yellow tops. The yellow top injectors can NOT be made to function in '89 and newer vehicles.