9 replies to this topic

[yel327]

Scans from Australian Street Rodding Magazine article about CRS drop stubs. Gives good drawings of the stubs for reference. You'll have to download and rotate the second page, had to do it in the scanner this way.

 

 1 of 3.pdf   1.62MB   31 downloads

 

 

 2 of 3.pdf   1.37MB   25 downloads

 3 of 3.pdf   1.65MB   21 downloads

[yel327]

Still available here by the looks:

https://www.stubtech...ucts/index.html

[Toranamat69]

Good to see they have this info available. I had this convo with crs about 10 years ago and the guy on phone couldn't tell me what kpia their drop stubs were and didn't know there was even a difference. I didn't buy any and am using tonner stubs anyway as they suit my set-up better.

Be good if they did the same for a set of a9x stubs to finally put that bs to rest.

I suppose I could do the measurements when I have a chance.

Edited by Toranamat69, 30 July 2021 - 12:38 PM.

[yel327]

A9X are the same as any other late HX or HZ, same part number. The kpi will be the same as all HK-WB. If you talked to the guys in that link they’d know what you were after, they took ownership of the stub manufacture before Rod sold Castlemaine Rod Shop which was about 2005 I think.l? See here:
https://www.stubtech...b-axles-sp.html

[Toranamat69]

Yes I agree. There is a cohort of expert on fb spreading misinformation about the A9x ones.

[yel327]

They are probably also the same “special” people experts that are anti-vaccines, anti lockdown, pro-trump idiots.

[claysummers]

According to the site stub tech is still owned by RH and his wife


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[yel327]

Yes I think that is right, they split it off before Rod sold the rest off.

[axistr]

To the best of my knowledge the A9X had the same Torana 9.5 deg KPI angle as the rest of the Toranas. I thought they were 9 deg but I will stand corrected. A9Xs didn't have different length top control arms to compensate for the 2 degrees of extra negative camber. I regularly hear the HX one tonner is exactly the same as A9X and share the same part number. I haven't had a set of original A9X stubs in my hands over the past 20 years to check the numbers or KPI angle.

 

However I get a few customers bringing me their stubs to ensure they will suit their car for good steering. Plenty of them saying they have original A9X stubs in their hands. I set the stubs in my vice and put a digital angle indicator on the bearing face and set to zero. I then put a straight edge or round bar through the top and bottom ball joint holes and read the angle from vertical. All the factory Holden stubs I check with a 1" higher spindle height have been close to 7 degrees. And Torana stubs have been closest to 9 degrees.

 

I had an original A9X in my late teens and always did my own wheel alignments. I never had problems setting good cambers and didn't have abnormal shim stacks under the top control arm mounts. Its a real give away seeing a Torana with early Holden or HQ-WB stubs fitted, they always have around 3 degrees or more of negative camber and buggered or worn inner front tyres.  When having conversations with the owners some tell me it don't steer practically well, and the other wouldn't know what good steering felt like it was the looks that was important to them. I can remember setting mine with 1/4 degree of negative camber and wouldn't have been able to get that with HX one tonner part number stubs.

 

I wouldn't mind betting the racing teams in the day used HX one tonner stubs with 7 degrees KPI as they wanted more negative camber for racing, but for street use it would have worn tyres badly and not handled as good on street radial tyres. My theory is Holden had the same casting and casting number as HX stubs but drilled/machined them with 9 degrees of KPI for street registered cars. Due to only low numbers when It come to the A9X it would have been a very cheep and simple solution rather than making unique control arms. This theory would fit because as we know Holden made unique steering arms rather than use the HQ steering arms. Using a rack and not the steering box and wheel offsets probably played a part to suit the difference in KPI. I could be wrong but But I don't think Holden just grabbed standard HX stubs from the parts bin to try and make them handle better, it just doesn't add up. In my opinion HQ-WB with 7 degrees KPI stubs on Toranas just doesn't work. Unfortunately most people aligning vehicles don't know what KPI is and its effect on steering and relationship with the scrub radius and rim offsets.         

[claysummers]

I can only agree with your logic axistr. At least fitting Holden to Torana gives a usable hard cornering camber, although trying to achieve adequate positive caster will only exacerbate the negative camber. It is when people try and fit Torana stubs to early Holden and end up with positive camber I really can only shake my head.


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