348 Ride height

The rear can only be lowered so much because the spring perches will hit the control arms. You might have to raise the front. Sorry, I’m no help with your measurements.

 

Also the factory springs aren’t stiff enough to support serious lowering. Gotta get H&Rs for that.

 

You do not lower or raise by knowing a set distance on the spring perch. You measure current ride height as per the WSM and then do the math with motion raito to determine number of turns to get the RH you want. Or you can just turn the perches and sneak up on your desired RH. The mortio ratio is in the WSM. It was 70 or 75 IIRC. Shock body is 1.5 pitch so 1.5mm per complete turn.

 

You need to find the detail spec dimensions.
Here you will see the height of the top of the inside of the wheel arch’s F+R .
It’s this dim you adjust to by trial and error . The metal arch to the flat garage floor .

Also with new springs / shocks ie the day they come out of the box and are fitted they tend to be stiff and stand long .
Takes approx a few months to settle , and or a good run a few 100 miles . Then re measure and if necessary re adjust .

Earlier this yr i had some fresh Koni s fitted to my GT4 ( 1976 build ) .The car had basically sagged and lowered itself + the shocks were quite worn . Happened slowly over the yrs .

First week it stood up as jacked up by a few cm . A few 100 miles ( the Koni s are double acting so need elongation as well as compression) it was stiffer a lot noticeably stiffer and juggling a bit
A 1000 km trip from U.K. to Switzerland it settled . Eased up ride wise softened and stopped jiggling about . By 4000 km post fitting all back to normal inc ride height . Std Konis for 308 / GT 4 s don’t have adjustable perches .

Noticed the 348 has .

Have you just fitted new shocks ? How old are they and what milage has been thrashed out on them ?

When new from Marenello the cars been sat for a few months , when sales were slow quite a few months to settle ….by the time the punter first owner got it …..+ it’s been PDI d and they I suspect would have done those measurements and adjusted a corner or two ? To spec .

 

Dims are here post #9 . [ doesn’t matter which fixed points are used ….in this case suspension bolts ]

https://www.ferrarichat.com/forum/threads/348-ride-height.585796/

 

The having to settle is only if there are other areas or itmes of stichion that have not been accounted for. When making these suspension adjustments it is more of a package or system than turn a screw and only your idle goes up or down. In suspension touch one thing it effects another.

 

Going backwards::

The distance between the perches is irrelevant--{what matters is the height of the rear A-Arm bolt on the chassis side compared to the ground while the car is on a completely flat surface}. A 32+ year old could have hit a pot hole hard and twisted the frame by a few 10ths of a mm, the spring perch housing could have taken a blow and bent, springs sag, ... the only way to get these things right is my first sentence in {}s.

The surface must be deal flat (less than 0.3mm across all 4 tires) or the cars differential load on the tires can change enough to alter the measurements.

If you raise the left rear you also compress the right front--that is just how the situation works, and also why one tires to get the cross-weighting correct (above and beyond getting each wheel weighted well).