Board Thread:Game Discussion/@comment-26819222-20160920060504/@comment-25956839-20160921090035

How far to upgrade the 910 will depend on your best strategy, see RR3 Wiki:Upgrades Strategy For 100% Completion.

It is used in three series, and upgrades are in three stages: Total 653 to FU - 20% discount.
 * TDT 378 (PR83)
 * HHC 85 (PR84)
 * CCC 190 (PR86)

@MELR2

How much did you spend on upgrading the other cars? Total 983 ?
 * HHC 315 P1
 * CCC 302 WP
 * TDT 366 Elemento

The 100% strategy guide, is the cheapest option, based on new players, with no upgrades on the other cars. Experienced players with upgrades should check their best strategy, before following the guide.

Even then bot slowing may be required. :)