[W126 Coupe] Rear anti roll bar conversion

[Divov]

Hi all,

Racing the SEC I need to reduce the understeer inherent in these cars.
My 500SEC has a feeble 14mm rear anti rollbar.

Has anyone got any experience on playing with the rear anti roll bar? 
What diameter should I be trying?

Thanks
Alec Divov

PS. Raced this week-end at Lichtenburg circuit which is the shortest & tightest track in the country. 
Only 1 mile total length! Totally unsuitable for the bigger cars.
Never the less, with the new Bilstein lowered suspension, the car was a dream and so easy to drive.
Won both races but was disqualified in the first for breaking my handicap time. 
The car was extremely competitive in the tight stuff but want more power!!  
36 laps & front tyres are history!! Backs still OK.
Any tips on were I can find more power on a limited budget.
  1.. Thinking of raising compression.
  2.. Bigger valves??
  3.. Gas flowing heads
  4.. Free flow exhaust.
Any recommendations / experience appreciated.  (this is a Euro motor without all the emission control crapola.)
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