24 replies to this topic

[GMLXSS]

Hi all, I have spent quite a bit of time looking for my answer through out the forum but have not bee successful thus far, so here's my situation...........I am putting together a big brake upgrade for my LX hatch & as she already has HQ set up on it from before I bought her, I don't know which stubs have been used in the set up HQ or Torana.
What are the advantages and disadvantages(if any) of using the HQ stubs? How can I tell if I have HQ or Torana?
If this has been previously talked about........a link pleeeaaaase. Thanks all.

[Statler]

Look in the Torviki links & the 'usefull topics' links m8.

[A9X]

clean the stubs and post the part numbers, i'll tell you where they are from

[dattoman]

Pics of your setup would also help

What diameter is the disc ?
If its got HQ setup on it... thats the stub thats been used
Unless they have machined the rotor down to 256mm and used the Torana stub

[wot179]

Have a read through here and the assorted links within. http://www.gmh-toran...rana stub axles

[GMLXSS]

Ok that's the kind of direction I needed.

Thanks guys. So the torana stubs will only allow small rotors, yeah? Hence if putting some big ass MF disc's on the front.......HQ all the way eh!!!!

[ls2lxhatch]

Dattoman was refering to running HQ discs on Torana stubs with HQ style calipers bolted to the Torana stub. This is achieved by reducing the diameter of the HQ disc to suit the Torana disc brake stub axle caliper mount position.

Any size rotor that can be fitted on a HQ stub can also be fitted to a Torana stub. It is the mounting of the caliper on the Torana stub can cause issues. A full size HQ disc can be mounted on a Torana drum brake stub axle with a HQ caliper using an adaptor from CRS.

Hoppers have a 290 mm and 330 mm kit for the Torana disc brake stub axle.


The only significant benefit of HQ stubs are they are stronger than the Torana stub.

The HQ stubs lower the car 20 mm which may require new springs.

The A9X style steering arms should be used with HQ stubs.

The HQ stubs increase camber which is good for a track car but may cause issues for s street car depending on the amount of camber you want to run.

The Hoppers 300 mm kit on HQ stubs will increase track by 8 mm each side. The Hoppers 290 kit on Torana stubs will not alter the track.

Edited by ls2lxhatch, 07 June 2012 - 05:58 PM.

[limo]

I have a question, at the farm I have a LC 4 dr donor and it has Commodore discs and calipers fitted.
how does this compare with the HQ set up fit and clearances? How is this fitted to the Torana crossmember?
I am thinking of using this front end in my LJ V8 with Commy BW cut to fit in the back

[dattoman]

Only you can answer those questions by taking a look at the car and taking lots of happy snaps to show us

[tsn007]

What are peoples experiences using the Torana drum stub and Hq rotors and calipers ?

Is this a good setup??

How does it affect steering,bump steer,?

thanks

[dattoman]

They shouldn't effect anything as nothing suspension wise has been changed

[limo]

Only you can answer those questions by taking a look at the car and taking lots of happy snaps to show us

I will try on sunday, I thought some one would have fitted the commy brakes,

[dattoman]

They don't just bolt on
So someones adapted them and not sure how till we see your pretty pics

[GMLXSS]

ls2lxhatch thanks for your detailed explanation.
Could you tell me why the different diameter rotors change the track dynamics in the hoppers kits?

[ls2lxhatch]

The rotors in the LX 290 and the HQ 300 kits have the same height so they are not the cause of the track difference.

The problem is that the Hoppers kit caliper can not be mounted in the same position on the HQ stub axles as they can be mounted on the LX stub axles due to the different factory caliper mount positions and the position of the axle on the stub.

The caliper on the LX kit can be mounted so that the original track is maintained. The caliper on the HQ kit has to be mounted 8 mm further out to clear the sub axle which then means that the disc has to be moved out 8 mm and the track is increased 8 mm each side.

The LX kit has two offset options.

Option 1 uses hub made for the Torana and retains standard track.

Option 2 uses the same hub as the HQ kit (Commodore conversion hub) and increases track by 8 mm which some people may want due to rim choice.

The only difference between the two Torana kits with the hub and the caliper spacers.

The difference between the Torana +8 kit and the HQ kit is the spacers and a difference shape caliper adaptor. The position of the holes in the HQ and Torana caliper adaptors are the same but the Torana caliper adaptor has a section cut out to clear the stub axle. The Torana caliper adaptor can be used on the HQ stub axle.

[limo]

here you go Datto, not good pics had to use my phone not camera as my SD card reader packed up






the caliper appears to be bolted to stub axle so maybe not commy but the stud pattern is
, so what are they?

[dattoman]

Its all HQ

[limo]

Its all HQ

stud pattern is commodore, I used a rear rotor from VS commodore and holes line up, goes straight on

[limo]

bugga now I have to change one of them, would have preferred HQ but if both were commy would have been easier
do the rear rotors have bigger holes?
I can't run HQ on the back with commy pattern?

[ls2lxhatch]

Commodore studs are larger than HQ and the pattern is close so Commodore rear disc rotors will fit over HQ studs. As long as the axle has a hub to center the rear disc rotor the Commodore rear disc rotor is fine on HQ stud.

The Commodore rear disc rotor is even a loose fit on the Commodore studs as the disc rotor is centered by the axle hub not the studs.

Edited by ls2lxhatch, 11 June 2012 - 06:30 PM.

[A9X]

the Commodore rear disc rotor is fine on HQ stud

^^ who are you and what have you done with Andy ???

[ls2lxhatch]

I agree with Bomber. See above.

The Commodore rear disc rotor is even a loose fit on the Commodore studs as the disc rotor is centered by the axle hub not the studs.

Edited by ls2lxhatch, 11 June 2012 - 07:09 PM.