138 replies to this topic

[originalglenn]

this is what id do

ring brown davis tell them there tank has failed inspection(youve already done this)

get engineer to talk direct to brown davis(engineer will probably tell em there tanks no good)

tell brown davis you can only see 2 options

1/ you return the tank for a full refund as it is unsuitable for the use intended( theres legal stuff about things you buy having to be suitable for intened use)
2/brown davis modify the tank so its legal(ideally at no cost but realisticaly at minimum cost say $100??)

your 3rd option is to have the tank modified yourself

some other thoughts

cops will pull you over at some stage
if they think your car is suss you will need to take it to your local rta for an inspection even if you do have an engineers report(last time i was pulled over for a breathyliser, did the test ,then young cop stepped back did a lap of the car then waved me on)

there is a really good reason why the body should hit the ground before the fuel tank

[76lxhatch]

Where are your exhausts? Exhaust counts as part of the body, and you can do a line from your wheels to the tips of the exhaust. That's what's on my Eng. Cert anyways.

That would fix everything

[Toranavista]

Brown Davis will argue the tank is high quality and fit for purpose as it is designed for circuit racing.

I think at this stage you need to gather factual documentation from as many sources as possible regarding measuring of the departure angle (Brown Davis, NSW RTA, Your Engineer).

In particular ask your engineer for the documentation he is using to base his decision.

If the "wording" the engineer is using is very subjective you need to either convince him your case for using the exhaust is reasonable or use another engineer with a different interpretation of the wording.

[ls2lxhatch]

Under the NCOP in WA you are allowed to have different width rims front and rear. See page 16 of this document.

Using the SS tyre CR70H13 which is approximately 200/70/13 as a baseline the following rules apply.

Maximum width 260.
Diameter 584 mm - 625 mm

Your rims have to be within +25 mm of the standard track. I would use the A9X track as a baseline.

Specifications - Rims, Tyres And Track

The NCOP which applies in WA does not mention that exhaust can be used in the departure angle calculation, the NSW documentation does. I have spoken to a fuel tank manufacturer today and they are checking if the exhaust can be used.

[76lxhatch]

Logically it wouldn't be so bad if the exhaust was allowed to be used. If you hit something with a reasonably solid exhaust which in turn hits the chassis rails or body, that would be enough to beach the car and avoid hitting the tank (which I believe is the spirit of the rule?)

[ls2lxhatch]

ls2lxhatch and 89'king

u can use the A9X tyre diameter on any lh/lx for wheel size.

the important thing is this.u can go 2inches wider than the largest optional rim for the torana.which is 14x6.so 8 inches is the widest u can go on a banjo.

the rule also states,where a donner axle is used,u can go 2 inches wider than largest optional rim for the donner axle.also u use the wheel track from the donner axle.u can real

tricky,buy putting hq-hx stubs on the front,this is a donner axle,and u can use the hq-hx wheel track,on the front

the largest rim i could find for a nine inch was 15x7.so on a nine inch u can have 9inch rims

a borgwaner in a vs clubsport came out with 17x8 inch rims.so on a borgwaner u can have 10inch rims.

i hope thats clear

The modification rules in NSW are different to the modification rules in WA. The NCOP is the National Code of Practice, NSW has had input into the rules and in many cases they are the same, however in regards to rims and tyres they are totally different. NSW has not adopted the NCOP at this point in time but is expected to some time in the future. The goal is to have one set of rules nationwide.

WA has adopted the NCOP, all light vehicle modifications are subject to the standards in the NCOP. Under the NCOP the rim width is dictated by the tyre width and profile. Tyre width and profile is dictated by a set of rules based on the widest tyre fitted by the manufacturer.

This is the section that covers rims and tyres.
NCOP11 Section LS Suspension and steering 3 Feb 2006

This section covers fuel systems. The NSW rules specify that exhaust systems may be used in the departure angle at the discretion of the engineer. The NCOP does not have this clause.
NCOP9 Section LM Fuel Systems 3 Feb 2006

Edited by ls2lxhatch, 08 June 2009 - 07:08 PM.

[ls2lxhatch]

It is noted in this diagram originally posted by Yella_SLuR and also posted my Mowie. Going by Yella_SLuR it may actually be the Canberra regs.

Edited by ls2lxhatch, 08 June 2009 - 10:15 PM.

[MRLXSS]

Would over-riders on the bumpers alter the Rear Entry Angle?

[fuzzypumper]

Just a thought, but if it is up to the engineers discretion on whether the exhaust should be considered then could there be some way of strengthening the tailpipes to act more protective to the tank clearance and change his mind?
Possibly a thicker pipe or dual mouting brackets on each tailpipe?

But then it all seems pointless if the coppa who pulls you over can stick his nose up the engineering report you carry in you glovebox and send to the RTA anyway.