thats all well and good , but as the 4efte cams are the same as naturally aspirated 4efe ones , the turbo cams were no better, so dont see your point
interesting, i wasnt aware that the 4efe and 4efte cams are the same but you learn something new every day.
in saying that it doesnt surprise me one bit. toyota being toyota cross parts over everywhere they can to save money / make things easier
i would say the cams were probably designed for the 4efte as they produced enough of them to justify specing them to suit the higher performance application. The 4efe hardly being a high performance engine wouldnt have gained much from a more suited n/a cam obviously.
anyone know if the 5efe cams are also the same as 4efte and fe?
i can see where your coming from but unless you know of fhe cams being used in another engine and that engine being forced induction or you know for sure that the 5efhe cams are the same duration as the 4efte cams then my point still stands. The 5eFHE cams are likely to have a greater duration and LSA than that you would expect from a turbo cam
i dont know the specifics of the duration of these cams but as a general rule an n/a cam is always going to be longer than that of a forced induction engine as it is benificial for the n/a engine to have a greater LSA and the valves to be open longer to alow it to draw in as much air as possible.
where as with a forced induction engine the air going into the combustion chamber is pressurized and doesnt need to be drawn in so the valves dont need to be open for as long nor do the valves need to overlap anywhere near as much. the longer the exhaust valve is open whist the inlet is opening the lower the exhaust gas pressure is going to be and the lower the temperature of that exhaust gas. both of these things are huge contributing factors to turbo spool times so not desirable for a turbo application.
there is so much more to it than that and i have missed out huge chunks of how it all works but you get the idea.
cheers
Ryan