Massive difference in AFR's between standard pump and 4bar S3 on mine @ 87k on the clock.
Only reason for 4 bar i can see if the extra fuelling required when shifting more air on a k03s?
but it is'nt required Phil.... software can use stock injectors to deliver whats required on CC and my own for example, where others reach for the 4bar fpr... but why?
If you can adjust overall fueling on something like unisettings, which will have the same effect as just throwing in a 4bar reggy, which works the pump harder, then the better solution to me is not to work a pump harder than it has to when its always going to flow less when it has to push more pressure.
I personally think its a throw back to the old 4bar maps revo did before stage 2's were named and dreamt up. (4bar codes and stage 2 were the same thing, just rebranded to make them appear new)
To me. adjusting fueling in software is the technically more correct way of achieving it. Its not like the stock injectors cant flow it, because they clearly can.
Larger reggys are to get more out of an injector size, to save you buying bigger injectors. BUT doing this adds more load to the pump, so anything weak will suffer this etra load.
ALSO, for those who dont realise, the fuel pressure regulators are rising rate regulators, so the 4bar is 4bar rated at zero manifold pressure (atmos, 1000mb ish ), and when boost is developed this is added to the fpr, so if you run 1.5bar boost your pump is trying to flow at 4bar + 1.5bar = 5.5bar pressure, whilst you are asking it for max flow... so its not too surprising tired pumps aint going to cope too well. Worse in
ibiza's as you cant even reliably see any lean conditions from the lack of wideband afr measurement.
Bosch 044 shown as a comparison of a good (upgrade pump, and the flow reduction with pressure)
