1988 Pontiac Fiero V8 Swap Project

This 1988 Pontiac Fiero is powered by a 4.6L V8 from a mid-90's Cadillac Seville STS. The 4.6L V8 engine, 4T80E transmission, fuel system, computer and accessories were made to fit in the same spot as the original Fiero 2.5L 4 cylinder engine. The swap is made to look as stock as possible. All of the electronics work together and the original instrument cluster reads RPM and speed properly. The 4.6L engine is the L37 version, with 32 valves, 300 HP and 295 lb/ft of torque. In it's current state, the car will do a 0-60 MPH run as fast as 5.2 seconds. Engine redline is 7000 RPM and shifts occur at 6850 RPM. There is not really an aftermarket for the Cadillac Northstar V8 engine. There is no reputable tuner in the US nor anyway to use a solution like HP Tuners on these engines. The PCM for the 96-99 Northstar engines is unique - it has two separate PCM's in the shell, one controlling the engine and the other the 4T80. Both sides are independent and have 88 kb of memory. These engines came about as aggressive as they could from the factory at 300 HP out of 4.6L displacement. It would be another 10 years before another domestic manufacturer got 300 HP out of a 4.6L engine (2005 Mustang GT). At some point since there is no future for the Northstar engine, the Fiero is due for a new engine swap. The 4T80E transmission will remain in place for it's durability and will run off a separate controller. The new engine selection will be an LS4 5.3 V8 (303 HP and 323 lb/ft torque) in which there are plenty of aftermarket options and tuning options available.


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