Hypertech Tune Question

[EdC]

I have an '07 Stage 2 with cold air induction (CAI) along with the Hypertech 93 octane high performance tune. In the lower gears at the higher rpm limits - I am getting significant "valve rattle" - or that is the how I can best characterize the sound I am hearing.

Anyone got a clue or recommendation???

Thanks,

[mln385]

If your valve rattel is what I think it is "DETONATION" then you need to back off the tune or risk engine trouble.

Are you putting 93 octane in the tank?

Marc

[EdC]

Yes I am running 93 octane - BP's best only. I did raise the RPM limit by 100 RPM on the tune - perhaps take that back to factory default or down a little?