User blog comment:Mr. Mysterious Spyman/Multiplayer T&T Renewal/@comment-115.27.211.119-20171104153114

For anyone who wants to know the system of mapping tuning:

As the word "mapping" indicates, mapping tuning can "map" your car's performances to the next upgrade or downgrade level IF THEY CAN.

Say, firstly ignoring the pro kits, taken upgrades 1111 as an example. If you tunes it 0808, then its performance is exactly the same as if it is upgraded as 0202, since the acc. and handling are downgraded, while speed and nitro are upgraded each for a level.

Things work well for both upgrades and pro kits. Since each pro kit combines two performance terms, in real game one can never figure out an equivalent balanced tune method (means the sum of mapping tunning equals zero) for elite cars to their non-elite counterparts (if your elite bar disappeared lol). However we do find unbalanced situations - 5555+5555+0000, which is exactly the same as 4444+4444. Despite unavailable (or only available by hacking), 0000+0000+8888 also features 1111+1111. Unsurprisingly, they share the same performance rank.

The last question is about when cars cannot be further up/down graded, namely 0- and 5+. For 0-, the maximal difference it could tune is half of the level between 0 and 1; and for 5+, the maximal diff. is half of the level between 4 and 5. Again, the performance rank follows.

I hope this can help you tune elite cars for MP more accurately.