Originally Posted by KPWSavestheDay
Are you kidding Chris? Airflow in lbs per minute has a direct relationship to the power you are making....pounds per square inch means absolutely nothing unless you are extremely familiar with the compressor map for the turbo you are running.
True, lb/min directly relates to power you are making, however I was meaning for instantaneous diagnosis of what is going on within your motor, aka when something is wrong. 15psi on a T25, obviously is different from a T88, and I'd desperately hope that you'd know the difference in what airflow you should be running on both turbos, and in my opinion with DSMlink lb/min is nothing more than bragging rights after you have already tuned your system completely. Yes it is a great number for judging your overall state of tune, but from what I inferred from your post, you were stating that it was a better tool for judging your instantaneous state rather than psi, which I dont feel is correct if you know what your setup should be at. Basically you said having a logged boost source is irrelevant is what I recieved from your reply, which to me is absolutely wrong.
Originally Posted by KPWSavestheDay
Because the airflow logged will be higher. Also I always save my logs with the turbo they were on, the gas used, the psi I was running, and the date and number of run that day.
True, I suppose once airflow is all calibrated that is correct, I still was thinking in terms of my past experience calibrating the GM MAFT as well as tuning the car thereafter. The notes portion of DSMlink I dont use very often, but it is pretty much irrelevant to me at this point with the boost sources.
Boost doesn't mean anything. It is pressure as measured in the intake manifold but it doesn't tell you anything about the actual flow of air. Is 15psi on a t25 equal to 15psi on a t88? Of course not. That is why looking at lbs per minute or some measure of flow is much more important than the pressure the intake manifold is subjected to.
To me I think this statement is also half correct and half incorrect. Depending on what state of tune you are in both aspects are beneficial. During tuning I agree, for very established setups such as T25's, 14b's, 16gs, etc, I like to aim for a lb/min that I know the turbos generally are rated for, during the initial tune, and once the setup is fully tuned the manifold pressure definately would come into play as far as diagnosing problems. [/QUOTE]
What would you rather me tell you, something meaningless like your signiture (23 psi on pump gas) or something that gives you an actual idea of what is being made, ie airflow logs of 44 lbs/min.
Want me to change the sig to 40+lb/min on pump? I put it in there because 99% of the damn people on this forum dont recognize airflow figures. I run a FP Green, 1g head, DSMlink, fmic, full fuel setup, 3" catback, 38mm Tial, etc etc. Believe me I'm not worried about my sig on Dragva.com in the least