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converting torana to hq stud pattern

Started by _ultrabluea9x_ , Aug 18 2006 12:30 AM

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38 replies to this topic

#1 _ultrabluea9x_

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Posted 18 August 2006 - 12:30 AM

does anybody know if there is a hq disc that will bolt onto a lh torana stub axle and retain the torana caliper,as i dont really want to change the whole setup,
any info would be a help

thanks..................

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#2 TerrA LX

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Posted 18 August 2006 - 12:40 AM

i dont think you will have much luck with this one as the radius from the center is different meaning the caliper for the HQ disc needs to sit out further than the torana one, hence you need the HQ or similar stub axle.
sorry.

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#3 _ultrabluea9x_

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Posted 18 August 2006 - 12:44 AM

thankyou,,,,,,,,,,,,,,,,,,,,,,,,,,

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#4 _Herne_

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Posted 18 August 2006 - 10:14 AM

You can set HQ/HZ discs up on a Torana stub axle, its a simple matter fo a tad of grinding where the caliper bolts up, my car has this mod (its very effective and handles well) Someone here a few short months ago posted some photo's of how to do this, has anyone got those photo's.

Alternatively is there anyone here who has performed this surgery themselves who can tell Glenn exactly what to cut and where? As I stated earlier it is an extremely simple and effective mod to fit HQ type discs on a Torana stub axle.

Cheers
Herne

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#5 makka

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Posted 18 August 2006 - 07:37 PM

you could get some blank LH discs and get them redrilled to HQ pattern

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#6 _torana_

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Posted 19 August 2006 - 04:56 PM

im the guy herne was talking about.

i did this conversion a while back ( torana to hq )
http://www.gmh-toran...ic=1012&hl=line

cheers julian

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#7 _ultrabluea9x_

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Posted 19 August 2006 - 05:16 PM

thankyou JULIAN

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#8 _pallbag_

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Posted 19 August 2006 - 05:39 PM

Not wanting to steal your thread ultrabluea9x, but can anyone advise me what the correct names of the highlighted A & B parts are in this photo.
And when people talk about converting from Torana to HQ/L34 front end is this what they refer to, or is there more to it apart from this and the stud pattern ?
Posted Image

Pic courtesy of Aidan's Hoppers stoppers installation thread

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#9 _ChiaLX_

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Posted 19 August 2006 - 06:01 PM

"A" is the lower wishbone and "b" is the upper wishbone.
generally these do not have to be changed for a hq coinversion.
The part they do change is the stub axle which is the part the disc would bolt onto.
they are uually swapped left to right so that the calipers can be bolted on without fouling.

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#10 TerrA LX

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Posted 19 August 2006 - 07:06 PM

the origional question was if HQ type disc's can be bolted to LH/LX stub axles and im still led to believe this cannot be done. am i correct or have i led ultrabluea9x on a bum steer.

torana's (Julian) link led to this quote "hi all
ive modified my lh torana to hq stubs on the front ( swapped from left to right ) and have bought a set of harrop a9x steering arms for the mod. I also have a set of wb calipers ( girlock alloy type )." end quote.
and is as i read above. if it can be done another way please let me know.

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#11 _ChiaLX_

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Posted 19 August 2006 - 07:15 PM

ALX76
I believe you are correct. the only way I know of fitting hq style discs to a torana is also changing the stubs.
His best bet would to be do as macca said and buy blank torana discs and get them drilled to HQ

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#12 _Herne_

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Posted 19 August 2006 - 07:34 PM

Hahahaha ^^^^ Take a look at my car fellah's lol

Herne

Edited by Herne, 19 August 2006 - 07:35 PM.

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#13 _ChiaLX_

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Posted 19 August 2006 - 07:41 PM

Come on Herne take off a wheel and get some pics up for us :rockon:

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#14 _Herne_

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Posted 20 August 2006 - 11:14 AM

Not sure if these are going to show what you need but here goes.

Posted Image

I personally do not know how to pick the difference so when I say I have HQ type disks on Torana stubs I am quoting what Bruce told me when I purchased the car.
Those who know Bruce will understand. Bruce also converted a modified HZ Salisbury 10 bolt to mount onto an LX floor pan about 9 yrs ago when my car was built. He was told that couldn't be done either lol Many have done it now.

Herne

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#15 _Herne_

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Posted 21 August 2006 - 02:51 PM

C'mon guys I met your challenge and posted the photo's.
Where are the comments? LOL

I don't need to say 'told you so' hahahaha.

Ahh just thought of one thing that might not be so obvious, Bruce had to grind away a tiny bit of the shoes themselves to make em fit.

Cheers
Herne

Edited by Herne, 21 August 2006 - 02:53 PM.

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#16 Toranamat69

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Posted 21 August 2006 - 06:51 PM

Herne,

I was going to suggest they look like HQ discs turned down to the same diameter as torana discs and then they should go on the Torana stub axle with the wider caliper but I wasn't sure how the pad would clear when I looked at my setup. Removing some metal from them would solve the issue.

Are those UC steering arms you have on there?

M@

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#17 TerrA LX

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Posted 21 August 2006 - 10:35 PM

yes i may have misled you on this topic as i know the disc bolts straight on, virtually all holdens interchange from far back as 1960's right thru to 1980's including gemini and so i should have more defined the origional answer to yes but i dont think you will get a caliper to fit with out too much trouble.
but i spose it depends on how much mucking around/expense you want to go to, especially if you have to turn down the disc, all you would gain is ventilated discs and forfit possible larger pad area and then there is the benifit of the one inch drop by going to HQ type stub allowing you to have more suspension travel if you origionally lowered the torana setup.
i see some validation if you adapt this process but at the end of the day..........

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#18 _Herne_

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Posted 21 August 2006 - 10:55 PM

Hi Toranamat

Yes the discs have been turned down about 20mm. The calipers are cast iron and not alloy due to the alloy ones tending to flex. Weight difference is of minimal consequence realisticly.
Steering arms are LX from what I am told by Bruce

Pads are ground down slightly so as the pad is the exactly the same as the caliper and fits snugly - all engineered of course! A tad of grinding also at the rear of the caliper for a snug fit.

Hi ALX76

No slur intended - yes agreed your statement was tad misleading esp to those who just read the forum and may not be in the least mechanically inclined, they may have thought I was bullshitting

No harm done though. Caliper fits fine with the tiniest amount of grinding, very minimal infact. Dont know about the expense as Bruce does most of the work himslef and machining he may get done as a favour or at a very minimal cost - perks of being in the trade for a a good number of years and helping each other out. My car was setup with handling and braking in mind! Anything else is secondary and dont forget this work was done about 9 yrs ago and the car is only on its second set of pads after pulling some impressive times on the track on many an occasion.

At the end of the day I have a very well behaved Torana that brakes extremely well.

Cheers
Herne

Edited by Herne, 21 August 2006 - 10:56 PM.

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#19 TerrA LX

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Posted 21 August 2006 - 11:06 PM

hey Herne,
"this work was done about 9 yrs ago and the car is only on its second set of pads after pulling some impressive times on the track on many an occasion."
let me know what pads you using as i get around 6 weeks on hard driving and about 8 months if i cruse.
cheers T.

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#20 _ultrabluea9x_

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Posted 21 August 2006 - 11:21 PM

i receQUOTE
Message Forwarded From Struggler

QUOTE
QUOTE
QUOTE
andrew

i forgot to ask when i rang you,

will i need the standard torana disc brake hub? or the torana drum brake hub for your way of fitting the HQ brakes?

i got a set of each now
can you give me a short run down on any other parts i will need for that conversion done the right way?

cheers
mick

You use the existing torana disc stubs, the HQ disc uses the same bearing. In order to clear the caliper you will need to machine about 6mm off the external diameter of the HQ disc, also get the disc machined thru the whole pad face (right up to the hub). The caliper will also bolt on but you will need to perform some clearance grinding to clear the tie rod end. Every thing just bolts on.

ok, when you say machine 6mm off the external diameter, thats on the outside of the disc? Yes, reduce the overall diameter of the disc by about 10mm (5-6mm off the radius)
and when you say get the disc machined thru the whole pad face, is that so i can use the torana calipers? No you will be using the HQ caliper but because they are bolting in the torana location they will sit about 6mm closer to the centre of the disc
or is the hq the one to use? Yes
sorry mate i am just trying to get my head around it before we pull everything off
cheers
mick

ived this post from yirriss,originally posted by struggler(where are you know)

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#21 _Herne_

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Posted 22 August 2006 - 12:01 AM

Bruce machined his bearing recess too, couldn't remember exactly why but is sure he took 3 to 5mm off to make extra clearance. he was not even sure if this was absolutely necessary, just something he did.

Cheers
Herne

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#22 _Herne_

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Posted 22 August 2006 - 12:03 AM

hey Herne,
"this work was done about 9 yrs ago and the car is only on its second set of pads after pulling some impressive times on the track on many an occasion."
let me know what pads you using as i get around 6 weeks on hard driving and about 8 months if i cruse.
cheers T.

I will ask Bruce as I have no idea what they are without removing them and not sure if I could tell then lol he did mention something about not breathing in the dust lol ahem......

Cheers
Herne

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#23 _Herne_

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Posted 22 August 2006 - 11:29 AM

ALX76

Hi again

Just realised how my statement of only on its second set of pads in 9 yrs could seem misleading at the least lol

To clear it up a tad, the car only did 20K in its first 7.9yrs (approx) of life. Some of that was done at Wakefield park.

Since I have owned the car I have clocked up 6k in around 15 months or so.

The pads are still very fine at this point in time.

For a comparison - Bruce and his buddy were out at Wakefield park for a days testing. His buddy with an S/L hatch (I am not sure what brakes it has) went through two sets of pads, Bruce's brakes were fine and hardly showing wear. Obvioulsy a whole lot depends on car setup and how its is driven.

Cheers
Herne