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Macdonald bros racing

Started by HDT166 , Feb 08 2014 06:18 PM

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#51 HDT166

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Name:Aaron
Location:Perth
Car:Lx 2 door, VC HDT
Joined: 11-August 13

Posted 07 December 2014 - 10:21 PM

Has any one used castlemaine 2" drop spindles ? Was thinking of using them with harrop arms . But I have hopper stoppers brakes so I gotta check if I can still use them.

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#52 _AGGRSV_

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Posted 10 January 2015 - 10:17 PM

The reason McDponald Bros don't buy the -2 is that they know they need to cut the spring. as the free height of the spring is still too tall for a Torana. The are too many coils to reset the spring lower without coil bind therefore the free height can only be altered by cutting the spring. Then you are back to a pigtail spring with too low spring rate.

That is what I thought, so I rang a couple of spring makers and they said that they don't have a jig to make a spring to suit the QA1 Pro-coil system. If you can give me the name of a spring manufacturer that does that would be great. The top and bottom are flat, the bottom id is 2.5" and the upper id is 3.5", free height is around 8".

I was considering paying to have a jig made but then I found that the QA1 Mustang Pro-Coil spring is close to what is required for a Torana. I am using the 600 lb/in as my baseline spring. According to my calculations it is close to being the correct height but I won't know for sure until the car is fully assembled and driven. I should be able to get the free height reset if required however one spring place was not that keen of resetting the spring without knowing the type of spring steel used. If I can't get the spring reset I at least now have a spring that can be used to make a jig and a baseline for the spring rate and free height.

So was a factory spring pig tail or flat top? I can't remember!

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#53 ls2lxhatch

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Location:Perth
Car:LX Hatch
Joined: 29-May 06

Posted 11 January 2015 - 12:27 PM

The factory spring has a flat top and a pig tail bottom.

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#54 _AGGRSV_

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Posted 11 January 2015 - 09:42 PM

Cheers mate!

Oh, did you end up trying a mustang spring??

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#55 ls2lxhatch

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Location:Perth
Car:LX Hatch
Joined: 29-May 06

Posted 12 January 2015 - 10:03 PM

I have the Mustang spring in. In looks about right however I won't know for sure until the car is finished and on the road. I have no idea when that will be.

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#56 _AGGRSV_

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Posted 15 January 2015 - 09:04 PM

Fair enough mate. I am heading to McDonald Bros tomorrow and was going to order them if you had of said they worked out ok. I'll pick Ray's brain anyway!