Yep, it is safe. The modified TCU wouldn't allow you to accelrate hard in fifth from third as it will drop it down a few cogs, it is only if your sitting at 30-35 MPH, which is easy in a big torqey V8 and will allow it achieve better MPG. I like to follow 30 MPH speed limits so I am essentially wasting revs and fuel sitting in fourth, and am sometimes tempted to drive at 38 MPH as it does bug me. I understand what your saying Sloss, but no crankshafts have gone bad at all as far as I am aware, and TozoM8 who is considered a ZF gearbox God over in the US, actually says this mod helps prolong with box/TC if anything, torque etc is limited in certain gears and some sophisticated tuning is built into the software, I can't pretend to understand it all though.
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2009 Audi RS 6 Saloon V10 - 420mm Ceramics, Keyless, Soft Close, Adaptive Cruise, Glass Sunroof, Blinds, Twin Pane & UV, Freeview & DAB, High Beam Assist, MTM bits, Audi Exclusive Bits, MRC, Milltek, GYEF1 ASY2's, Bluetooth streaming music to AMI mod - 753 PS/1021 NM
2016 Audi S3 Saloon, Sepang, S-Tronic - B&O, Tech Pack etc... Company Car
1995 Audi A8 4.2 V8 quattro Sport - Bose, Solar, Blinds
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