Holden Problems

I can't comment on the Walkinshaw chip specifically, I don't have any experience of it, but I'm not a huge fan of the chips in general as you don't really know how they achieve the results they claim, and ultimately you don't know what effect they will have on the car down the track. If you can find someone who has fitted a Walkinshaw chip you could ask them, after all first hand knowledge is the best you can get.

Running the higher pressure shouldn't have any great effect on the wear of your tyres as you describe, but you could drip it back to the specified pressure and see if that makes any difference. I would believe that what you are seeing is the result of the alignment Holden uses.

It's sad that it takes outside pressure to get action, but it's nice to know that there are people in customer service at Holden that do a good job. Happy to be of assistance.

Yes, it is within the law, and no, there's not a lot you can do about it. If it's any consolation everyone else is in the same, or a similar boat. The best solution is to estimate the actual speed using the GPS results and drive accordingly.

It's suffering from fuel surge, and I would be looking into the fuel tank, to the anti-surge fuel pot.

As it's not a consistent problem you would have to think there's an issue such as a connection or a sensor that's faulty. The factory system used by Holden is an Impco one, designed and developed by Impco for Holden. I would bypass the Holden dealer and go to an accredited Impco dealer and have them check it for you.
 

The main things to be aware of are the start-up knock in the engine that plagued the Gen III, also the rear suspension clunk due to warn bushes, and the rear tyre wear.
 

It's a service reminder and should have been reset by the mechanic at the time of the service. Take it to a Holden dealer who should be able to do it for you.

We have asked Holden to check your claim and get back to us with a result of their investigation.

That's what happens when you change to low-profile tyres and fit harder springs, shock absorbers and bushes. You can try different shock absorbers, which might help, but there's not a lot you can do about it.