My rear leaf spring seemed to have lost its tension, and the dealer tech said he tightened some bolts that increased the tension and raised the ride height in the rear Can the leaf spring tension be increased for a firmer ride by tightening some bolts? Which ones? Is this a "tunable" feature?

 

Not without also gaining some ride height. Yes it is tunable, but you really have only two options. Tune it for equal left to right ride height. Or get 4 scales, and tune it for best handling.

 

Pfadt coilovers will solve the problem.

 

Yes but I have the F55 so don't want to drop that feature.

 

You've got a great suspension. I had an '05 with MSRC and loved it, and of course the ZR1 and some exotic foreign stuff is using it - not just a "similar" shock, but shocks made by the same supplier as the Vette uses.

Some people think anything OE is crap, and the answer to any issue with the Nav, brakes, seats, tires, shocks, etc., etc., is to get some aftermarket replacement. Not true!!

Now, to answer your question.....No, the composite leaf spring tension is not tuneable.

You can corner weight the car, which will put closer to the same weight on each of the four corners - or similar weights on each end of the front and rear leaf springs, but you can't change the tension or spring rates of the composite leaf spring.

Here's a picture I pulled from another thread that shows a broken leaf spring:




The owner of the car in the picture installed exhaust cutouts and the hot exhaust gas heated up the leaf spring and it broke.

What you can see in the picture above is the mounting point for the right side of the spring - and there's another one for the left side.

Those are fixed mounting points. If you could move those mounts left and right to change the point where the spring "pivots", then you could adjust the "tension" of the spring.

Butt.....those "pivot" points are fixed, and the spring rate won't change - unless you blow hot exhaust on it!!!

So....your springs haven't changed any, and your mechanic may have changed your ride height, but he didn't change any spring tension. The leaf spring tension cannot be changed.

Bob

 

A new car will settle just a bit as the suspension bushings break-in but that's about it. Did you by the car used?

 

What may have happened then was the mounting bolts were loose. They tightened some bolts and the rear suspension is firmer. I bought the car new, but ran over a curb, so it may have loosened something.