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Originally Posted by rdkarthik  Alpha-N is not an advanced version for mapping. Its just an alternative. It works great on wild cam profiles because these cams produce a lot of pressure fluctuations in the intake manifold when they are working at RPMs other than designed for, confusing the speed-density system. |
.. we can minimise the pulses to a certain extent only by tuning the length of the intake runner but again we have
restrictions as to how much we can compensate by doing this ... alpha-n is the next best soln
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Originally Posted by rdkarthik What errors are you talking about? Is it computed quantity of air in the system?
Alpha-N does not depend on vacuum anyway...
right.. MPFIs are far better than TBI for precision and metering.. MPFIs can be Alpha-N too.
wrt escorts, when compared to a carb system, alpha-N TBI is definetly an improvement, but not wrt mpfi and/or speed-speed density ssytem for a stock car. |
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Originally Posted by rdkarthik 1. With Alpha-N its very difficult to pass emission standards, even at OEM levels - E2,E3,E4,etc, as compared to speed-density or maf. Thats why we dont see them on street cars (execpt in limp home mode with a screwed map sensor system) |
yes dude and these alpha-n systems dont consider
target AFR at all like speed density systems ..base maps simply say x rpm and y TP = IPW in simple words..
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Originally Posted by rdkarthik 2. Alpha-N is prefered (actually a must) for individual throttle body and/or wild cam profile applications.
3. MAP or MAF is a must for turbo/supercharger applications |