The 4/4 runs a 1 inch turbo with around 14 psi boost. Boost comes in at 3,000 rpm. Based on the result from two rolling roads the power output is measured the same at 195 hp. However it has taken me two years to get the mapping as I want it. It is not only power delivery but also needs to be well mannered in all sorts of driving conditions. Simply placed on a rolling road you may get a mapping suitable for the track, but not necessarily suitable for the road. Fortunately Omex were extremely helpful, and I found a few good ideas in some books about ecu tuning.
On the subject of evaps, I found little info on zetec evaps, so I purchased a second hand valve so I could work out what it does. Basically if there is a vacuum at the manifold, and a signal from the ecu, then it will allow vapor out of the filter and into the manifold. It may be that the ecu works in the same way as that on my +8, once the engine is up to temperature, the ecu signals the valve to open. There may also be a condition in the ecu on engine speed ( my memory isn't much good )
I am sure it would be possible to retain the evaps and build a simple box to enable evaps based on engine temperature, the valve takes care of the requirement for there to be a vacuum in the manifold. The omex ecu does have programmable outputs, I would have to check the manual to see if it could enable an output based on engine temperature.
With some work I have done on the +8, and the various issues (nightmares) I had with the 4/4 mapping, I am not sure that these modifications are for the faint hearted. It needs a certain grim determination (or stubbornness) to succeed.
