I hope someone here can help me out on my Triumph Spitfire Mk3 1968 powered by Hayabusa engine. Weight is 690 kg and distribution is 51% in front and 49% for the rear.

Upgrade of the rear suspension:

I have decided it was time to upgrade the rear suspension with a full CV jointed axle setup along with another diff with LSD and better ratio (3,55:1). The Leafspring, diff and the swing axles will be removed and my goal is to go the full independent rear suspension route.
These modifications will be custom made.

But, I have not found the right suspension yet, i.e. I am looking for Coil Overs or a good solution for the rear suspension.

Any good advice's greatly appreciated.

the simplest significant upgrade to spitfire mk3 suspension is to change the rear spring to 'swing spring' and associated front anti roll bar: all as per mk iv and 1500.

after that longer drive shafts may help (as per the late mk iv and 1500)

for a different arrangement, the gt6 'rotoflex' is also an option.

all of these can be done without substantial body or chassis changes.

wouldn't fancy putting Hyabusa power through a rotoflex joint :-)
As already said, unless you are looking to alter the chassis a swing spring plus a 78" front ARB si probably your only option. Spax do adjustable rear shocks.

This link shows someone putting coilovers and CV joints on a GT6.

He kept the Triumph diff, though. He also kept the transverse leaf spring to act as the upper wishbone.

http://myweb.tiscali.co.uk/tlweb/gt6/repmod/mod_sus_rr_shocks.html

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Originally posted by softfeet
This link shows someone putting coilovers and CV joints on a GT6.

He kept the Triumph diff, though. He also kept the transverse leaf spring to act as the upper wishbone.

http://myweb.tiscali.co.uk/tlweb/gt6/repmod/mod_sus_rr_shocks.html

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quote:

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Originally posted by snakebelly
wouldn't fancy putting Hyabusa power through a rotoflex joint :-)
As already said, unless you are looking to alter the chassis a swing spring plus a 78" front ARB si probably your only option. Spax do adjustable rear shocks.

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Originally posted by gremlin1234
the simplest significant upgrade to spitfire mk3 suspension is to change the rear spring to 'swing spring' and associated front anti roll bar: all as per mk iv and 1500.

after that longer drive shafts may help (as per the late mk iv and 1500)

for a different arrangement, the gt6 'rotoflex' is also an option.

all of these can be done without substantial body or chassis changes.

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Does anyone have the length of the lower wish bones, i.e. from the frame to the hub? I am going to fabricate them, but it would help if I have appr. length for them. i don't need bended/curved ones, as i am not using Rotoflex, I am using CV joints.

Grassroots motorsports (US magazine) did this a to an RX7 powered beast
http://grassrootsmotorsports.com/project-cars/1974-triumph-spitifre-ro-spit/

Few pictures on their website.

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Originally posted by Northpole
I hope someone here can help me out on my Triumph Spitfire Mk3 1968 powered by Hayabusa engine. Weight is 690 kg and distribution is 51% in front and 49% for the rear.

Upgrade of the rear suspension:

I have decided it was time to upgrade the rear suspension with a full CV jointed axle setup along with another diff with LSD and better ratio (3,55:1). The Leafspring, diff and the swing axles will be removed and my goal is to go the full independent rear suspension route.
These modifications will be custom made.

But, I have not found the right suspension yet, i.e. I am looking for Coil Overs or a good solution for the rear suspension.

Any good advice's greatly appreciated.

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quote:

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Originally posted by woodster

quote:

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Originally posted by Northpole
I hope someone here can help me out on my Triumph Spitfire Mk3 1968 powered by Hayabusa engine. Weight is 690 kg and distribution is 51% in front and 49% for the rear.

Upgrade of the rear suspension:

I have decided it was time to upgrade the rear suspension with a full CV jointed axle setup along with another diff with LSD and better ratio (3,55:1). The Leafspring, diff and the swing axles will be removed and my goal is to go the full independent rear suspension route.
These modifications will be custom made.

But, I have not found the right suspension yet, i.e. I am looking for Coil Overs or a good solution for the rear suspension.

Any good advice's greatly appreciated.

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Pictures please

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quote:

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Originally posted by Northpole
What is "Swing spring"?

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Update:
I have now replaced the rear diff and suspension in my Spitfire. Using Subaro STI R160 diff, axles and hub. Bought Coilovers with 250 lbs and 330 lbs springs. will start with the 330 lbs as I have in front lower the car 3.5 inch from standard, using now shorter and stiffer springs (330 lbs)
I had to do some modifications obviously.
Like building a plate for diff, shorter axles, custom made, smaller brake, liquid handbrake etc.
Custom made fully adjustable wishbones. Toyo R888 tires.
I hope with Limited slips diff, ratio 3,54:1, I will get better handling and hopefully will be faster from the line.