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RarlyL8 RarlyL8 is offline
Crotchety Old Bastard
 
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,308
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Glad to. The OEM -145 head has a lower chamber machined for use with a frequency valve. If the Lambda system is inactivated (O2 sensor unplugged) the frequency valve goes into default. The default setting will not allow adjustment to the flow. If the frequency valve is defeated the fuel head will not function properly. The 007 modified head has a lower housing that is machined similar to a Euro fuel head. The frequency valve is eleminated. This allows the flow to be adjusted and will actually flow more fuel than a Euro head when wide open. iA sent them out wide open which is why we saw so many come back for re-adjustment.
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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 02-15-2014, 08:54 AM
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