I am using an individual runner intake manifold (8 x 52 mm throtthle blades)
and the vaccum signal (MAP signal) generated is very bad ( around 9 PSI and rapidly fluctuating). This gives problem in calibrating the acceleration enrichment (transients) during part load and engine goes very lean ( 17-20 AFR) with extrem stumble.
Seems like a small change in throttle opening with this kind of intake manifold gives a BIG change in added airflow which is not able to compensate for with a low MAP signal. (SW function not capable ?)
When using Alpha-N I can program what MAP signal I want to correlate to my trotthle opening and thereby be able to use the whole range of transientcompensation via the TAU table.
Have you maybe another opinion / experience ?
Engine is a Chevy smallblock 383 cui.
/Swede
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