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UC Front subframe on LX Hatchback


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#1 _mr hatchback_

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Posted 13 May 2011 - 01:30 AM

Hi Guys,

I have been doing some mods on my LX SS Hatchback in the way of changing the front subframe to a UC unit w/ HQ spindles as I wanted better steering geometry etc
& I seem too have run into a little bit of a problem with the aftermarket AP Racing calipers fouling up against the tie rod, I have been told that I should use a HZ RTS
steering iron as this well help with clearance & there is also another type of tie rod that I should use thou my mate could not remember at the time & I am hoping that I
will be able too get a look at the Hatchback over the weekend that was his as he did a similar conversion on it thou not with AP Racing brakes it had the big Girlock units
on it & he managed too get it spot on & it pulled up really well & his turning circle did not suffer also.

I would greatly appreciate any advice or help on this as it is a bit of a stress & not too mention that I paid a fair bit of coin for the AP Racing brake setup that I explained all
of this to & I thought that suspension shop would be able too work this out thou it seems like I will have too do all the groundwork for them, I have picked up a set of HZ RTS
steering irons from the wreckers & I just need to figure out if they will work & also what type of tie rod & then I hope all will be fine & then get the brakes setup correctly & ???.

I don't know if this matters thou I have GTS Rallye type steel rims that were 14 Inch & they have been modified to 15 Inch so they still measure 14 Inch on the inside diameter
& they have a step up as I am shaw you guys are aware of & yes it is very tight with the AP Racing brake setup, I could have gone for a bigger rim & brake thou I wanted to
keep with the old school steel GTS Rallye type rims as I love them & the look too.

Thanks guys......

#2 _robslxhatch_

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Posted 13 May 2011 - 07:10 AM

how about swapping stubs left to right and rear mounting the calipers, like hoppers style conversions. Pics might help aswell. Are your calipers touching the tie-rod or the tie-rod-end???

#3 76lxhatch

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Posted 13 May 2011 - 07:19 AM

You don't want the HZ steering arms, they will be way out. A9X(-style) ones would be the best option with the HZ stubs - they will offer the most clearance at the tie rod end too as it will sit lower. Otherwise you're looking at tweaking the caliper position or changing it completely by swapping the stubs as above (which carries its own set of clearance issues).

#4 dattoman

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Posted 13 May 2011 - 09:24 AM

I'd like to see which caliper , disc and positionisng on the vehicle

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#5 _mr hatchback_

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Posted 13 May 2011 - 11:01 AM

I will figure out how to do the resizing of the photos soon as I have not yet figured it out on this forum as I am not the best with that sort of stuff,
also too answer the previous questions about the stubs they are left on right & right on left & the caliper is fouling against the head of the tie
rod & I am hoping that the longer arm & tie rod will help & yes I could try & mount the calipers at the rear thou I am hoping I don't have too.

Thanks guys...

#6 dattoman

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Posted 13 May 2011 - 04:38 PM

If you send me the pics I'll resize and post them for you

[email protected]

#7 TerrA LX

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Posted 13 May 2011 - 05:21 PM

If you upload to a photobucket account then post the IMG link from photobucket here it resizes automatically.

#8 antelopeslr5000

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Posted 13 May 2011 - 06:12 PM

how about swapping stubs left to right and rear mounting the calipers, like hoppers style conversions. Pics might help aswell. Are your calipers touching the tie-rod or the tie-rod-end???



Depending on what type of AP caliper is being used, the calipers may need to be changed from leading to trailing also if swapping stub axles from left to right.



#9 _cruiza_

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Posted 13 May 2011 - 06:57 PM

castlemain rod shop have repo A9X steering arm which will fix up your steering geometry and some / all of your clearance issues

#10 lxsstorana

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Posted 13 May 2011 - 07:36 PM

Hi Guys,

Went to the suspension shop with Mark today and he took some photo's.

Here they are, appreciate your opinions.(and he bought some HZ steering irons to overcome the problem).

Cheers Mick.

Posted Image [Posted Image
Posted Image Posted Image
Posted Image Posted Image
Posted Image Posted Image

#11 _mr hatchback_

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Posted 13 May 2011 - 07:51 PM

Hi again Guys,

I would like too say thanks to Michael aka LXSSTORANA as I have not yet mastered my way around a computer with copying & pasting etc with this type of stuff thou I will get it sorted soon, I did compare the HZ steering irons with the Torana ones & they looked around 25-30 mm longer which should help with clearance thou I don't want too get bad bump steer etc.

I would like too say thanks to Dattoman for his offer with helping me with the photos & also any of your input too.

All the best Guys.

#12 dattoman

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Posted 13 May 2011 - 09:17 PM

Well I'm not entirely suprised
That calipers not exactly designed for a HQ disc of 276mm diameter and 25mm thick (assuming thats what they are)
It suits something more like 300-330mm x 28 and even then its tight

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#13 76lxhatch

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Posted 13 May 2011 - 09:21 PM

You still don't want to use the HZ steering arms, they will introduce some major bump steer

#14 _robslxhatch_

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Posted 13 May 2011 - 10:23 PM

I am guessing rear mounting these is not an option??

#15 _mr hatchback_

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Posted 14 May 2011 - 03:34 AM

Hi Guys,

I have had a look at the receipt from Specialised Brake & Clutch & also I had a look at the emails between us that have I have managed too get some more info on the kit that
I was supplied from them, the kit consists of AP Racing 4 piston caliper w/ adaptor mounts to suit HQ & Mintex M44 Pads to suit AP w/ DBA slotted disc rotors to suit HQ pattern
that are 276 mm disc size that also suit 14 Inch size Rallye GTS Rims as these are a 14 Inch turned into 15 Inch size Rallye GTS Rims which is a tight fit & the caliper had to be
modified for clearance issues also.

Thanks guys for your help & I will also give a call to Castlemaine Rod Shop & see if they can offer some help in the way of the A9X style steering iron as I am sure there is a way
of getting this correct it will just take some research & help also advice from guys like yourselves on the forum that I am very grateful of your input & help etc, I am very tired so I
may have gone on a bit so I will say good night & good bye for now Guys.

All the best.

#16 ls2lxhatch

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Posted 14 May 2011 - 11:54 AM

What is the part number on the AP calipers?

A9X steering arms are made and sold by Harrop Engineering $155 each + GST although you won't find them on their website.

Left 99-ARM2066-10
Right 99-ARM2066-20

The HQ style stub axles lower the ride height compared to the Torana stub axles. You will need to fit a spacer where the compression bump stop hits the k-frame to limit compression travel to the same height as the standard compression travel. The A9X has a metal block welded to the k-frame.

Edited by ls2lxhatch, 14 May 2011 - 12:04 PM.


#17 Toranamat69

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Posted 14 May 2011 - 02:14 PM

The A9X steering arms are the only ones you should be using with the HQ stubs. Lookin at the pics though, I am not sure they will fit with that combo though.

#18 ls2lxhatch

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Posted 14 May 2011 - 02:58 PM

So can this problem be overcome? or is Mark fighting a loosing battle with the current set up.

If the caliper is from the CP5200 family then the smallest diameter disc is 304 mm x 28 mm. A HQ disc does not even come close to being suitable.

#19 _cruiza_

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Posted 14 May 2011 - 05:36 PM

What is the part number on the AP calipers?

A9X steering arms are made and sold by Harrop Engineering $155 each + GST although you won't find them on their website.

Left 99-ARM2066-10
Right 99-ARM2066-20

The HQ style stub axles lower the ride height compared to the Torana stub axles. You will need to fit a spacer where the compression bump stop hits the k-frame to limit compression travel to the same height as the standard compression travel. The A9X has a metal block welded to the k-frame.


you are absolutely right my bad I was rather tired when i posted sorry for the confusion

#20 dattoman

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Posted 14 May 2011 - 05:55 PM

Try then on the back (swap stubs) is his only hope
But I think its a ballsup from the start trying to fit that caliper on such a small disc

#21 micklx

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Posted 14 May 2011 - 09:06 PM

Who is Kevin Gavin ?

#22 _Liam_

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Posted 14 May 2011 - 09:53 PM

Sounds like Kevin Gavin owns Specialised Brake & Clutch.

#23 _mr hatchback_

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Posted 15 May 2011 - 02:53 AM

Hi again Guys,

I must say that yes it is Kevin Gavin from Gavsport which is under the Specialised Brake & Clutch business in the Penrith area of Western Sydney & I will tear him a new
rear end if this is a big stuff up on his behalf as I made it very clear via email & I made sure that he responded to me email just incase there was a stuff up, I will also take a
closer look at the brake calipers on Monday as I still have the Hatchback at the suspension shop which is not that far from my house & I get on very well with the shop as I
have dealt with them over many years & they are good guys to deal with.

I should add that once I mentioned to Kevin Gavin that there was a problem he has not replied to my emails & when they want you to give them a deposit too get the job
started they are quick on the reply email thou not so at the moment so I hope that he can fix the brake issue, & the suspension I am sure will work out once I try a couple of
different steering irons & perhaps I will have too use these Castlemaine Rod Shop or better still the Harrop A9X style steering irons sound like the ones I should use & I will
also talk to the suspension shop about this spacer for the HQ spindles 'stubs' for the bump stop issue also.

Thanks Guys.....

#24 _Bomber Watson_

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Posted 15 May 2011 - 03:28 AM

Hey mate.

Looking like you have got the raw end of the stick.

You definitely will need the A9X style steering arms with any H series stub as far as i know.

Seems you have been sold a dodgy kit if datto is correct, and datto is always correct. So if you have trouble fitting everything up and the supplier doesnt want to know about it i have some holidays booked soon, i'll be more than happy to catch a flight, meet up with you, down a bottle of bourbon (would be grouse if you supplied that) and then go visit the supplier.

Sure a few other blokes will be willing to lend a hand.

Im sure all you need is a few wild boys on your side to get a good result...

Cheers.

Edited by Bomber Watson, 15 May 2011 - 03:29 AM.


#25 ls2lxhatch

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Posted 15 May 2011 - 11:42 AM

The Harrop A9X steering arms will lower the tie rod end about 15 mm compared to the UC steering arms which may solve your clearance issues.

If the caliper is a CP5200 family then I doubt an engineer could approve the caliper being used on a 276 mm x 25 mm disc. You should be covered by the NSW statutory warranty as the goods are not fit for the purpose for which they were sold.

4 Piston Calipers - CP5200 Family specifications.

Edited by ls2lxhatch, 15 May 2011 - 11:43 AM.





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