Quote:
Originally Posted by matsalleh76
Increasing the front spring rate will also increase understeer.
We have never had any high speed straight line stability problems: the suspension bushes, steering components, etc are fresh and the car has always been smooth, steady, & true @155KPH. Perhaps something in the suspension/steering needs attention.
What caused the rear subframe to fracture and where did it fracture? 124's will sometimes develop a crack on the bottom of the rear diff carrier section between the two diff mounting bosses.
Regards,
bobf
(ex-Westbrook CT.)
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The 560SL and 450SLC springs have the same spring rate. The 450SLC spring is just longer. See picture.
This cars suspension is not as refined as the 124. It's a 1971 handed down from a 115.
Alot of this could be me. I'm really not comfortable with either the stock 560SL or the modified 560SL above 100 MPH and that number has been coming down as my age goes up. But it does seem to come on earlier with the V12 like 90 MPH.
The rear sub frame cracked from engine torque. Once I put in a limited slip phantom grip rear and stick summer tires it stared to hook up and cracked the Diff mounting pad. I have substantially beefed that up and don't expect any more problems there. I attached pictures of the old and new mount. Old one was made with a 1/8" tube and 0.095" plate tig welded from the top only. New one is made with 5/16" tube and 1/8" plate tig welded from both sides.