At what power level do you need to beef up the rear A arms ?

[pxr5]

Ive picked up a ST170 2l engine, I would like to fit a turbo, so at what power level do you need to strengthen things? thanks

[casesensitive]

mabbs got 308bhp or so out of his, that's the most of any Rocket I'm aware of, he might be the man to ask.
Or you could read his extensive build and see if he did upgrade the suspension.

[Stiggy]

Chains tend to break at the weakest link.
But what is considered the weakest part of the Rocket suspension?
Is it the wishbones, the bolts, the brackets on the chassis or the chassis?
Claimed big BHP is largely irrelevant, it is torque that creates the load on the suspension components.
It is possible that the bones etc will take higher loads but how long for?
Has the possibility of continual high force and fatigue been taken into consideration?
Will say 250 ft lbs of torque cause failure at the corners after just one blast off the line or many thousands?
Have the potential forces created by bigger power probably coupled with bigger brakes, sticky tyres and a heavy foot been considered?

The chassis and bones were designed and tested and analysed by a structural engineering firm using data from a 1.6 100 ft lb Focus. They passed the test but we did not continue to increase loads until something burst.

[casesensitive]

I *think* both jack and kiwicanfly have modeled the chassis in Solidworks, simulating the various parts to breaking point.