[jmj996]

Sounds like you picked up a really nice car. Computer guy here since I was 10 yrs old, but also a car guy since I was 15 yrs old. I think you're really going to enjoy this car. It's nice that you've done all that extra work to freshen it up, but that had to be really expensive. At some point I think you should try to start doing as much of this stuff yourself as possible, because it's going to be very expensive to own otherwise. It's not an ideal car to learn on because of the extra intricacies of turbocharging and computer control, but it's still a nice car to start getting your hands greasy with because there is soooo much documentation and numerous how-to guides for various 951 maintenance and upgrade projects out on the Internet, as well as awesome 951-specific aftermarket support (or you can even go to a Kragen or O'Reillys and get things like a fuel injector reseal kit or a rebuilt starter the same day).

I'm not a tuner (yet), but being a computer guy, I'm heading that direction as soon as I'm ready to take the big, expensive jump in HP. I think you would have the most fun with this car trying to implement a good EMS with a lot of sensors (i.e. add things like intake air temp sensor). My main focus for now has been the brakes, suspension, and reliability for the track. I still need a roll bar and some other safety stuff before I go big on HP increases. I'll be going the route Nize took, with an independent Engine Management System. Fortunately for you, a lot of the expensive hardware has already been upgraded for you, so you've got a big head start.

I can't tell you what to do about the speedo. Personally, I wouldn't go through the trouble. Just use the calculator on Clarks Garage and theoretically determine how far off it is, then do a drive-along with cell phones to see if it checks out on someone else's speedo (just don't use a Japanese import for the drive-along because they are notorious for being a little higher than actual speed - Nissan has even had to extend their warranties due to being high by more than 5% on a lot of vehicles, which results in the speedo showing more mileage than actual).