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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,104
The RPM switch is an excellent idea because you do not need the FULL, and I mean all hell breaks loose full gush fuel dump at 3,000 rpm, the point at which modern turbochargers produce FULL BOOST. It is 'tunable' by inserting an rpm plug of varying RPM full boost threshold. Mine happens to be 5,200 rpm - up from 3k stock.
That is precisely the area I am typing about. That 3000rpm dump point is not an absolute and can be tuned out. An rpm switch does not reduce the dump, it just moves it so that the extra fuel dump is in an area where it can be used so it does not show up on the graph as excessive. It does work as it was designed, just not the way I would go about getting there due to the variables seen in boost threshold. I prefer to control boost enrichment by boost signal, not by rpm.

The above "guide" is very simplistic. There are many ways to achieve the same HP levels.
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 09-21-2007, 08:15 AM
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