Rara,
Thanks for clearing that up for me, and people can argue sematics with me anytime they want.. that usually leads to something else ENTIRELY new being brought up.. hnce my question below...
See, I guess even an old dog can learn new tricks...
oh, and goodwin, I hate to argue semantics, but the fact that there is nothing before 4400 rpm is not turbo LAG, but is a function of the boost threshold. Boost threshold is the minimum rpm where appreciable boost is made, lag is the time it takes (while cruising above the boost threshold) for the turbo to spool up when the throttle is opened up. Boost threshold is really a matter of how well the overall turbo is sized, both the compressor and turbine sides. Lag is mostly (though not all) a function of turbine sizing.
Question, then... I understand what you are saying, and I know what you are talking about...
Hey! I want To put a T04E with a monster Compressor wheel and a HUGE turbine
but what I want to know is how , from a dyno plot, can you tell the difference between the two, lag and boost threshold.I've seen many dyno's of guys with too large of turbo's that caused them to be above the surge line on the compressor maps, and with the overly large turbine's they displayed similar plots..(late boost causing the HP to peak out very high), but after just changing the AR and turbine size of the exhaust housing, and keeping the compressor the same, it pulled their HP curve BACK down lower in RPM's, granted I still think their Compressor wheel was too large, but hey... I wan't there when they picked the turbo's.. and at least they recognized that something was not right and they were trying to correct it)... I guess thats what confused me...any input would be apreciated...
Thanks...
