01-08-2012, 10:37 PM
Iirc, there is a bracket you can take off, and unplug the oil feed pipe to the turbo. Taking them off makes access for adjustment easier. You can probably leave the bracket off for a quick smooth road test, just don't let the car shake around too much... obviously DO refit the oil feed pipe before a quick test drive to check the adjustment, and DON'T forget to refit the bracket once things are ok 
You can adjust boost once FMIC is on, but the mapping also boosts fuelling, the higher the mapping the more boost you'll make. A standard HDi makes about 15psi on 90bhp mapping, but with 120bhp mapping and an FMIC it'll make about 16-17psi, and then with 150bhp mapping probably 17-18psi, so the adjustment is only tweaking it up a few PSI really.
MBC is a pain to fit. I don't really see the point in them as they just lag the turbo wastegate response and make them boost spike more, and the last thing you really need on these cars is ALL that torque coming in suddenly as it just makes the lower gears even more useless. Once in the higher gears you have 'acceleration' lag (ie, revs can't rise that quick vs boost), so the presence of the MBC's lag isn't really noticed.
Handy to tweak up, but how often are you really gonna tweak boost once you've got it right?
Also lots of failure points. Costly. Also really bad if you snap the boost take-off or inlet on the compressor housing or wastegate actuator body, as it's a turbo/engine moved/out job to get the turbo out and fix it all properly (seen it done opps!)
Dave
You can adjust boost once FMIC is on, but the mapping also boosts fuelling, the higher the mapping the more boost you'll make. A standard HDi makes about 15psi on 90bhp mapping, but with 120bhp mapping and an FMIC it'll make about 16-17psi, and then with 150bhp mapping probably 17-18psi, so the adjustment is only tweaking it up a few PSI really.
MBC is a pain to fit. I don't really see the point in them as they just lag the turbo wastegate response and make them boost spike more, and the last thing you really need on these cars is ALL that torque coming in suddenly as it just makes the lower gears even more useless. Once in the higher gears you have 'acceleration' lag (ie, revs can't rise that quick vs boost), so the presence of the MBC's lag isn't really noticed.
Handy to tweak up, but how often are you really gonna tweak boost once you've got it right?
Also lots of failure points. Costly. Also really bad if you snap the boost take-off or inlet on the compressor housing or wastegate actuator body, as it's a turbo/engine moved/out job to get the turbo out and fix it all properly (seen it done opps!)
Dave