New owner with offset question (and more)

[riber.bentsen]

Those numbers sound to me like Cup1 rims. They are the ones I have on my car, and yes, they work without spacers.

The tire sizes are: Fronts: 225/45R17 (alternatively 235/40R17) Rears: 255/40R17 (alternatively 265/35R17).

[stepson]

Originally Posted by dtw

No idea why there are two computers, but here mine are! The boxes are sealed up a lot like 911 3.2 DME boxes which I've been into many times, so that was no big deal. In went the chips from Ken and we're done...very quick 30 minute job that was a nice break from the front of the V8, which is not going so quickly.

The left computer is the ignition computer
The right computer is your injection computer.

[dcrasta]

YMMV however I would not go below 55 front offset. I do not think those wheels would work well on your Porsche 928. Possibly better suited for your 911. In any case, this website has some good information and opinions that may help you make your decision.

Landsharkoz - Home of the Porsche 928 In Australia - Tech Tips - 928 Wheels & Tyres

Cheers.