[RKDinOKC]

On the GTS went very conservative on the power upgrades and only then when another repair actually made is economical. The reason for that is the 951 before the GTS.

It was a 90 944 Turbo. It had be rebuild by a guy that was a Boeing engineer. It had a bunch of stuff. K27-8 turbo with custom chips, lightweight flywheel, Lightened knife edge crank, carilllo rods, had been nikasiled, the heads o-ringed, a boost/wideband/egt data logger, adjustable fuel pressure regulator, and a manual boost controller. It ran like a scalded ape. It had one problem though. The EGT got way hot accelerating. As I fixed and tuned stuff my goal was to add some power but also keep it as reliable as possible. Ended up with the shop I used putting a bigger turbo than I asked, leaving slop in the piston/cylinder tolerance (they thought it would rev faster being a little loose) and not torquing the bolts properly (bolts strarted coming out or breaking off). It had 420rwhp but at only 2500 miles was a disaster. To bad it cratered. Was planning make my own boost controller like the eboost controller that would let me program the boost curve through the rpm range for each gear. That would let me limit the boost/wheel spin in lower gears, but also crank the boost up where it could be used in higher gears.

So in maintaining the 928 I only added upgrades I was positve would not cause any reliability issues. The supercharge or turbos fur sure. Example: GT cams. When in needed new cams I went in with factpry GT cams. They made more power than the stock GTS cams, but could still use the valvetrain from a stock 928 engine. There were other hotter cams available, but needed custom springs, valves, and lifters to be reliable.

So my engine upgrades were GT cams, headers, x-pipe, and programmable ecu chips. Am adding 24lb injectors because tuned for the cams/exhaust it is using 100% of the stock injector timing at full load full throttle. Not a lot, but takes the 350hp crank (dynoed 295rwhp) to 380rwhp. Pretty significant considering the increase is across the entire torque curve not just bumping up the peak.