Here are the improvements that were made during Ferrari 348 production:
14. 08/20/93 clutch thrust bearing/slave—production improvement
Other factory enhancements:
the change in final drive ratio
The 1994 348 Spiders have a 4.34 to 1 final drive ratio.
The 1993 348 TS's have a final drive ratio of 3.53 to 1 (click here:
the stainless steel fuel line change, the major change to the Spider one-can exhaust from the old 2-can muffler, rear subframe upgrade to part number 4628, the change from the Motronic 2.5 to Motronic 2.7 ECUs (at and above chassis #86406), the increase in redline to 7800 RPMs (Spider, SS, Challenge, Competizione), the battery location switch from the rear bonnet to beneath the front bonnet (1992), larger intake plenums (for GTS, GTB, Competizione), 50mm wider track via 25mm wheel offsets, exhaust cam pulley setting re-indexed (U.S. Challenge 348's and Euro GTB, GTS, and Spiders), and the front bonnet A/C fuse switch from blade to inline bullet.
1989 model Ferrari 348's did not have the mad mouse seat belts. Early 1989 models had an external radio antenna.
1992 models and up came with body colored side skirts and spoilers. SS models had a reverse curve front spoiler (and small lip), removed rear grill, kevlar seats, chrome prancing horse "cavallino" emblems front and rear, strengthened door panels, leather interior door panels, and a taller 5th gear.
Challenge models also came with aluminum pedals, an alternate fuel pump, a lighter front bumper, roll cage mounts, carbon fiber brake cooling ducts, a bigger heat shield, rubberized tow hooks front and rear, exhaust timing advanced, and 18 inch speedline racing wheels (225/40 ZR 18 front and 265/40 ZR 18 rear).
Competizione models came with carbon fiber bumpers, aluminum and carbon fiber "thin" front bonnet and rear decklid, carbon fiber undertray, F40 half-shafts, upgraded fuel mapping in the ECU chips, lexan rear window, 15 inch brakes, and a strengthened frame.
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