mass-hole

I understand how it works, what I am curious about is if anyone has noticed that the truck engine brakes more when anti-lag mode is active vs when it is not. Kinda curious if the feature could be used on the regular trucks as an engine brake when towing since the Ecoboosts tend to suffer a little in this area.

chimmike

anti lag mode?

you know what antilag typically does...typically drops ignition timing way down...in some cases can cause the combustion to occur within the turbo itself. Antilag would not be an effective engine braking system, and in general it can destroy turbos pretty quickly if overused.

EDIT:
http://www.tfltruck.com/2016/12/2017...answered-ford/

interesting. Doesn't sound to me like having the turbos spinning a higher rpm is going to assist engine braking in any way.

mass-hole

Right, the raptor just acts like a diesel and opens the TB to allow the engine to flow its full volume through the turbines.

It may not help, that's why I am asking. I have to imagine though that running at 5000 RPM's and having the turbos spooled up to 12-15 psi is going to require a lot of HP(or Anti-HP i guess you could call it).

chimmike

remember when coasting or engine braking, the engine is basically acting like an air pump; there is no fuel used.

mass-hole

Right. I wrote a tune for my Jeep that closed up the VNT vanes when off throttle and above 2400 rpm instead of leaving them wide open. It was able to make 1.7 BAR of intake manifold pressure at 2900 RPM just coasting, no throttle. The thing is, that 1.7 Bar is at 6500' where the ambient air is .8 Bar so I was making a little over 2:1 pressure ratio with no fuel, just straight air being pumped through.