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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 14,101
The RPM switch is a device that allows you to move an entire range of function. It has no provision for fine tuning.
You are talking about high HP applications, those above 375RWHP. Those issues simply do not apply below that power level. This is not a theory. The RPM switch does nothing to add fuel, it simply delays the onset of boost enrichment. I don't have one on my engine and the ratios are perfect.

Back to our regularly scheduled program....

Are there any patterns forming? How about a simplistic build guide:
255 RWHP - stock Euro
300RWHP - turbo, cams, 0.7bar
350RWHP - turbo, cams, intercooler, headers, 1.0bar
375RWHP - turbo, cams, intercooler, headers, 1.0bar, head work
400RWHP - turbo, cams, intercooler, headers, 1.0bar, head work, fuel system mods
450+RWHP - all of the above plus EFI
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, 05:52 AM
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