Try to get the RB30, ando usé this tune: 1st: 5.00 2nd: 4.30 3rd: 3.80 4th: 3.30 5th: 2.80 6th: 2.30 7th:1.80 8th:1.30 Final Drive: 0.59 And use the best things as posible My 1/4 mile: 4.3 My 1/2 mile: 7.1 I use the Mclaren speedtail but i can do a time of 7.6 at 1/2 mile with the Datsun 240z