Rear subframe

[jp280]

Hy guys, im planning on installing an Nissan R32 rear subframe into my Nissan 280zx, however the front mounting points are wider on the R32 subframe than the 280zx by aprox 50mm. So my question is, am i better to modify the mounting points on the chasis or have the R32 subframe modified?
The second question which would solve the first is, i could buy a Racefab subframe made to suit my application, is this simply up to the certifier or is there more to being able to use one for road use? (picture of racefab subframe attached).
Many thanks, Jeremy.

[Todd]

Essentially you can modify either the vehicle, or the subframe to make it fit, the decision is up to you. However if you modify the subframe mounts, make sure that no geometry changes are made to the subframe itself. If you were to make geometry changes to the subframe (or go for the custom Racefab item) you'll need to get Technical Advisory Committee (TAC) Design approval. This is a relatively easy process, especially with a company like Racefab who have probably gone through it before and can provide the engineering diagrams required.

If you modify the R32 item to fit (or the vehicle to accept it), there's simply the LVV standards to meet, most of which should be outlined in the NZ Car Construction Manual/can be downloaded here: www.lvvta.org.nz/shop/. You'll need to look at both the sections titled 'Chassis Modification and Construction' as well as 'Body Modification and Construction'.

Hope that Helps
Todd (the new guy)

[jp280]

Hey Todd, another quick question do aftermarket lower control arms also require the same design approval? Picture is of the arms i plan to use.

Many thanks, Jeremy

[Todd]

Hi Jeremy,

Yes, if you're still to process a design approval, then include these on it also.

You can see some info here though, that should help guide you in the right direction: www.lvvta.org.nz/documents/infosheets/LVVTA_Info_01-2012_Custom_Suspension_Arm_Inspection_Approval.pdf

The exact answer on if it does or doesn't require TAC approval will depend on if the geometry has changed from that of the OEM arm, and if the certifier is satisfied with its design and construction. The wording from the suspension standard states "Where any doubt exists in relation to any aspect of an aftermarket suspension arm during the LVV certification assessment process, an LVV Certifier should use Chapter 6 Suspension Systems of the NZ
Car Construction Manual as a source document for guidance, and as part of that assessment process may elect to refer the component to the LVVTA Technical Advisory Committee for approval."

Looking at those arms, it does appear the geometry will be changed, so I'd say yes, approval is required.

Hope that all makes sense.

Todd