I have a 1993 VMax with a TBoost installation. I have had the bike since 2005. The VBoost has been working perfectly all this time. Even after I installed the TBoost, 4 years ago, everything worked as it should, 3K, 6K, off. The first time I noticed any problem was 2 weeks ago. I went out for a ride and the VBoost started opening @ 6K like it should, since the TBoost switch was set on 6K. On the way back home, I felt like berserking a bit, but the Boost did not kick in at all. The bike still has massive power with no dead spots, but now, I can't tell the difference in the power, no matter what the TBoost switch is set on. I don't hear the whirring sound of the VBoost in the startup phase and can't see any linkages moving, either. Could a faulty TBoost module create this scenario?