Quote:
Originally Posted by MikkiJayne
The best thing you can do with an FSI or TDI engine is to disable the EGR in software and then remove the inlet and manually clean out all the crud. With the EGR disabled it won't build up again.
|
It seems I am mistaken on this as the FSI engines don't have EGR, contrary to many threads on the various forums. Lots of people call the secondary air valves 'egr valves' since they're in a similar arrangement to EGR valves on diesel engines, but in fact they work completely opposite to EGR. It appears that the FSI engines are in fact no different to the port-injection engines in this regard so all the crud that builds up is purely from oil vapour! Colour me surprised.
In that case, a catch can may actually help, but only if it removed
all the oil vapour, which can be quite a challenge. Looking at the SSP for the 4.0TT it seems Audi have gone to much more trouble to achieve this separation than in previous engines to try and solve the problem. There is an aftermarket device which is commonly used on marine engines called the Provent, made by Mann & Hummel, which is also quite popular with the TDI crowd. If there's any space under the bonnet of a D3 S8, this might be worth investigating:
