Knowledgebase
Fitting VS-VY L67 into VN/VP commodore
Posted by MACE Support 3 on 07 October 2014 08:42 AM

L67 conversion into factory 5 speed manual (T5/getrag) commodore

  • Mirror balance flywheel to flexplate (balance pressure plate to FW for added security)
  • Get the crankshaft drilled for flywheel dowels to fit flywheel
  • If running the factory loom then several wires must be extended including:
  • Fuel injectors
  • Crank angle sensor
  • Temperature sensor
  • High flow fuel pump (walbro 255LPH EFP-057/GSS-342)
  • PCM/memcal must be recalibrated.
  • These following steps regarding wiring only apply if your undertaking a complete conversion (meaning Ecotec/Buick V6 and automatic transmission swapped with an L67 and manual transmission)
    - bridge neutral/park safety switch permanently for the car to start
    - wire up the manual speed sensor to the dash (3 wires)
    - wire the manual reverse switch to the reverse lights (2 wires)

 
L67 conversion into factory 4 speed auto commodore

  • If running the factory loom then several wires must be extended including:
  • Fuel injectors
  • Crank angle sensor
  • Temperature sensor
  • High flow fuel pump (walbro 255LPH EFP-057/GSS-342)
  • PCM/memcal must be recalibrated
  • Make sure you retain the L67 flexplate when purchasing the motor as the ecotec and L67 have dissimilar rotational harmonies

These following steps regarding wiring only apply if your undertaking a complete conversion (meaning Ecotec/Buick V6 and automatic transmission swapped with an L67 and manual transmission)
- bridge neutral/park safety switch permanently for the car to start
- wire up the manual speed sensor to the dash (3 wires)
- wire the manual reverse switch to the reverse lights (2 wires)


A VS Ecotec / VS L67 heater tap is needed to hook up the heater/coolant hoses correctly.

 

Try finding a complete T5 V6 engine loom & matching ECU to use for the conversion to make life easier. If you use your existing wiring loom, you will need to modify the engine coolant sensor plug. As the L67 V6 is a different shape plug to the VN/VP/VR V6. You will need to cut an engine coolant sensor plug and wires off an old ecotec loom, and graft it on in place of the original plug.

 

It’s much easier to run the MAP (manifold absolute pressure) sensor and fit a MAT (manifold air temperature) sensor to the LIM (lower intake manifold) of the L67 engine. Then you can re-use most of your present loom and the ECU. With this setup you will run the one knock sensor (removed from the current engine & installed into the L67 on the same side yours presently is). You have to do this as ecotec (twin) & non ecotec V6's (single) knock sensor use a different frequency or something to that effect.

The VN/VP have the same air-conditioning pump (compressor) as the VR's, so re-use the compressor mated up to the VN/VP passenger side alloy engine mount bracket. The VN/VP engine mount brackets have locating holes for the VN/VP compressor. The VN/VP/VR compressor will pick up three of the holes and you need just to reuse a bracket off the VN/VP/VR set up. The 4th mounting support bolt passes through the bracket which gets bolted to the block and has a nut fitted to the end of it as shown below:

If installing an L67 with the factory 4L60e auto that came with it into earlier commodores like the VN-VR, a portion of the box will need to be shaved in order for it to sit comfortably inside the transmission tunnel. This will be a case of trial and error until the right amount has been removed. Also, at least one of the auto transmission lines that run alongside the block will need replacing as it is different. Swapping to hard steel line from later models will work.

In most cases Mace Engineering will be able to provide a memcal or PCM/ECU recalibration for you to be able to run the L67 without any worries. Unfortunately we cannot modify the factory ECU for the VN-VR commodore at this time; a full custom dyno tune will be required to run an L67 safely. However, if a simpler conversion is desired, we recommend using a VS L67 or Ecotec loom and modifying that accordingly running alongside the VS L67 ECU or Ecotec ECU. If this path is taken then we can accommodate a tune for that ECU, please see the ‘VS commodore running the L67 with factory VS ECU’ hyperlink below and submit to us a report thoroughly listing all specifications of your vehicle including any current modifications prior to making a purchase.

VS commodore running the L67 with factory VS ECU
(select set-up from drop down menu)


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