That's what full-race said about ATTESSA and why they took it out.
" ATTESSA is known to cause oversteer. Particularly on the early R32 GTRs, the ATTESSA system was very slow to react and would often "add" FWD too little, too late. Many Japanese and Australian race vehicles have done away with the ATTESSA system and gone to a fixed, manually controlled torque split, similar to an EVO or STI. Adjusting the torque split allows you to change the balance of the car. If the car is oversteering, add FWD. If the car is understeering, add RWD. By utilizing a fixed tq split, the driver can learn to anticipate the vehicle's handling and will not be surprised by an understeer or oversteer condition when least expected.
Follow the link below to read a great article about the problems, and remedies of the ATESSA system on the R32 GT-R's.
http://autospeed.com/A_107753/cms/article.html "
If what Simmode said is true, then I'd assume their problem was that ATTESSA automatically adjusts torque split from corner to corner whereas they dialed in a set split which works great for one corner but not so much for the next.
Edit #2: I didn't see them explicitly say you couldn't use ATTESSA though. I mean after all you're buying a full GTR pretty much, you could very well use the ATTESSA controller instead of Blitz or w/e they have you buy and use with their conversion kit.
Modified by Lev_96_240sx at 5:38 AM 2/22/2010