Engine/Transmission (1998.5 - 2002) Bigger turbo effect on Edge?

[RowJ]

I don't understand enough about how my Edge EZ works to answer my own question.



How (if at all) will going to more air from a bigger turbo effect timing and fueling of the edge?



Been told with stock turbo (HY-35) Edge kicks in fueling around 8 psi on middle setting. Will it still take 8 psi on bigger turbo or does more air at a lower reading "fool" the Edge to kick in differently?



Based on the difficulty I am having in just formulating this question, I realize how little I understand. Hope this is clear enough to get feedback!

 

[RustyJC]

The Edge EZ is going to respond to intake manifold boost pressure, not mass flow. It gets its pressure readings from the manifold air pressure (MAP) sensor and, depending on the jumper position setting, varies the point at which it begins adding additional fuel from that. My recollection was that the EZ began adding fuel at 3 psig (position 3), 10 psig (position 2) or 20 psig (position 1) boost pressure, but I could be wrong.



Rusty

 

[BarryG]

RowJ:

I don't think the EZ timing will change do to a turbo difference. Your turbo question does bring up a point that may affect the amount of time before it hits full fuel mode. Typically a larger turbo has more lag so it will take a bit longer to spool up to the desired psi for the ez to get to the full fueling point. So it will still add full fuel at the preset psi but it may take a bit longer to get to that point due to the increased turbo lag of a larger turbo. It is just looking for the preset psi to add more fuel. However If I have this right what you lose on the bottom end you will make up for in the top end with more air (read higher psi from the turbo). If I recall the HY35 map is good to about 28psi, an HX35 map is good to about 30 or 32psi (dont know what an hx40 is good for). I may be off on my map numbers but it is in the ballpark (they can put out more but it becomes ineffecient after that point due to increased air temp). A call to Edge, Piers, Diesel Dynamics etc might be in order to get a better descritption of what happens exactly. If I am wrong someone will surely chime in with a correction.