TeT W-901 Review
Warning: it's not pretty. Please don't take it personally, I'm not trying to be rude or mocking, I just think there are some tips that could improve your tunes. 
And this much power on such little grip is always gonna be a handful, so you've set yourself a really hard challenge.
Note: all testing was done without any TCS or ASM. I realise this is not what TeT specifies but IMHO much better tuning results are achieved without it. It is fine to use a small amount in endurance races, for example, to help achieve consistent laps, but at the tuning stage you really need to access the car's full potential without any electronic nannys. </rant>
Parts only (except suspension) (as a baseline against which to compare the TeT settings)
Urgh! Grip, please?!!!! 1st gear? No. 2nd gear? No. 3rd gear? Maybe...
The 2nd to 3rd gearshift is soooo slow (since a Racing Flywheel is not available for the W12) that I found myself cruising around in 3rd even in the slowest corners. Using 2nd meant waiting far too long for 3rd to engage and then most often wheelspin in 3rd because it is hard to get the right amount of throttle after the change.
Braking distances are much longer than expected, but interestingly they improve if early downchanges are used to compression lock the rears. Heavy understeer while braking.
The front end does not grip until very late in the corner. And at this stage the driver is about to start accelerating out, so rear traction becomes the more important issue.
Laguna Seca lap time (using DS2): 1:27.6 Yes, most of the above problems would be greatly reduced with better tyres, but still I think there is much more potential even with the current parts...which is where TeT comes in...
TeT Tune
(using default settings for downforce (not sure if it's adjustable anyway?) and LSD because none were given)
Braking distances are still very long (perhaps not something that can be avoided with these parts). Understeer while braking is slightly reduced, which is nice.
And the shorter gearing means better acceleration in 4th (I can see how this would make quite a big difference when using TCS). Despite having "traction issues" under 150km/h, the stock W12 is indeed over-geared, so this is a step in the right direction.
Rear traction when accelerating is slightly improved, so I think the +ve rear toe has paid off.
Perhaps due to the low ride height, the overall balance is very understeery. As Greycap noted, the ride is very stiff.
Laguna Seca lap time (using DS2): 1:26.1
So the clock gives a 1.5 sec improvement and my thumbs also liked your settings better, which means there are some positives here. If I may suggest further areas to look at for improvement, they would be: raise the ride height, softer springs + dampers + stabilisers, taller (smaller number) 2nd and 3rd gear, shorter 4th and 5th and 6th gear, less front brake, and experiment with the LSD settings to reduce understeer. But maybe in the end, better tyres are unavoidable for taming the beast.
Again, please believe that I am only posting this as constructive criticism. Hope it helps.
Simon
) and maybe an SUV one, although I'm wondering, MX-Crossport, Honda Element, Land Rover Range Stormer, can't figure out what to choose.
The difference was that guy plastered the Aids on his cars (even the very slowest VW Beetle), wheras GT_Prologue 5 seems more discriminatory.
