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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.