Early on - while trying to tweak an engine or two with some parts swaps, I had attempted to sort out and chart the available 928 HP numbers by year but it seemed there were no two spec sheets that agreed on all the transition points. My final checkerboard of data simply turned into a mess because the factory numbers were roughly plotted by world market, model, year, engine, compression, fuel/ignition control, transmission type, final differential ratios and production month. In some years one spec sheet also threw into the mix something called a “special order application” for super rich customers in countries like Saudi Arabia and Bahrain.
The U.S. HP numbers below may be off a little -
I thought the life of the 4.5 Liter 16 valve began back in the 1978 and ran up to 1982 with about 230 HP using the Bosch CIS fuel injection (some late models came with an early L-Jetronic fuel injection). The 4.7 Liter 16 valve engine ran from 1983 – 1984 with 240 HP using the electronically controlled L-Jetronic fuel injection (some with early LH-Jetronic). The 5 Liter 32 valve engine was available from 1985 – 1991 initially using a modified LH-Jetronic which quickly changed to Bosch Motronic for about 300 – 330 HP. The 5.3 Liter 32 valve engine ended the lineup from 1992 – 1995 with 350 HP and Bosch Motronic fuel injection. Of course these numbers do not include the hair on fire nitrous, twin turbo, rocket fueled afterburner kits that are available for owners who can’t quite get enough HP under their butts…….
Please correct any discrepancy you notice….
Thanks Michael
