You should also consider, turning the N1000 at the max speed, if you will cross the point of diminishing returns well before the impeller reaches terminal velocity?
I haven't seen a compressor map for the N1000 (yet - still looking for one), but if it is anything like the s-trim, by the time you get up into the upper 40k rpm range, the efficiency of the compressor drops way off, and the result is, you aren't moving a significant increase in air mass, but you do start to needlessly beat up (heat) the air, which in turn demands less timing &/or richer mixture, so you end up with same or less net horsepower than you'd make keeping the compressor closer to the efficiency sweet spot in the compressor map.
Here's the s-trim map:
http://www.vortechsuperchargers.com/...-trim_map.html
The N1000 should look very similar in shape, just picture everything shifted to the left slightly, i.e. max airflow of 850 cfm vs 1000 cfm for the S-trim.
These maps can be confusing. The most important trend to pay attention to IMO is the line on the bottom right, thet 65% efficiency line. Notice how the flow increases dramatically at first, but then as impeller speed goes up, the flow stops increasing even though the pressure keeps rising. [edit] and as it goes past 45000 rpm the mass airflow actually DECREASES as pressure increases! [/edit] Adding pressure (boost) without adding mass airflow is a bad thing, you are basically getting the same amount of air at a higher temperature. :weird:
Bookmarks