How can I stiffen up the suspension

Can anyone please help me in hardening up the front suspension and rear. I don't want to lower it as its for my boys banger racing. Is there a cheap way of doing this or changing it with a different type of car.
Many thanks
 
Hmmm, not sure, I know the anti roll bars from the k11 micra s fit without to much modification. Might help
 
Spring assisters. Blocks out 1.1 coils thus stiffer spring and raises ride height marginally.

GE14 for the front.

http://www.ebay.co.uk/sch/i.html?_o....TR0.TRC0&_nkw=spring+assisters+ge14&_sacat=0

I think I got mine from Amazon for £15 pair delivered.
I tried a pair of these in the back but they were too small for the gap. Thus, when the gap closed it would go significantly harder and caused oversteer moments.

You can raise the back with additional spring perches from top and bottom of a donor cars rear springs. Try a top one in the bottom (as well as the top) or two bottom ones in the bottom, or even 3!
 
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