An excellent starting point is
http://www.mkiv.com . I'd suggest you pay special attention to the
FAQ and
Tech Articles sections. There's also a semi-hidden "
tmp" area with a few goodies not linked to anywhere else.
Toyota has also published a great information source for the Mkiv Supra called the NCF (new car features). The '93 NCF for the Mkiv Supra is a picture-and-text description of the features in plain English. An online copy exists
here, but I'd encourage you to get your own copy from Toyota (part number 00400-NC096) if you're serious about learning the details of the Mkiv. The NCF very well-written, and really does makes for great bedtime or travel reading!
Another great information source (especially for turbo details) is:
http://www.moreboost.org/
...note that this site isn't up 100% of the time, but when it is up the information there is unique and extremely valuable. In other words, don't get discouraged if the link doesn't work when you click it...just plan on coming back to it at another time.
Lastly, take a look at this pretty cool (imho) site featuring a list of very high horsepower Supras at
T04R.com. You'll find configuration details about street-driven, high-horsepower Mkiv Supras.
If you don't find what you're looking for at those sites, or the 'stickied' threads on this forum, please feel free to post any question on this forum (in a new thread), and I'll do my best to get you an answer.
All members: Please feel free to add to this thread with any great links to other information sources for the Mkiv Supra (except for other 'forums', since we know this is the forum that folks should be coming to!
)...