I've noticed that the cars with a turbo, notably the RB4 GT, have problems with the turbo blow off valve. It may just be the turbo gauge, but whenever I lift off and hear the blow off valve blowing off, the turbo rpms go down. The purpose for a blow off valve is to keep the rpms up by releasing the pressure that would otherwise create drag on the turbine and slow the turbo down. I don't know if the blow off valve has been implemented in the physics model for LFS, but it's something that bugs me :P

Thanks

when i was driveing the mrt in single player, the turbo sometime kept cutting out. but the accelerator was at full

The turbo rpms go down? How do you know? There is NO display of turbo rpm.

What the gauge is, is Boost Pressure. And when the dump valve or the blow off valve opens, the boost pressure will do down.

To Turbo: Are your pedals spiking? Where you changing gear? More details are needed to evaluate your 'problem'.

Never mind, i fixed it