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wcc wcc is offline
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Join Date: Aug 2005
Location: Michigan
Posts: 3,334

Car runs and pulls nice and strong. Been really enjoying it this summer. But I can't get over the dieseling. I've heard from others also that it's normal, but it just bugs me. Last night I sprayed some ether around with no change EXCEPT where the air box bolts down. Could this be my problem? I've looked for a gasket or O-ring from our host but haven't found one yet. Any ideas or suggestions would be helpful.

Thanks guys!
Old 08-01-2007, 04:54 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
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Join Date: Dec 2004
Location: Danville - CA
Posts: 1,259
Rarly8 - Is the timing adjustment you speak of just an issue of adjusting the timing to factor settings or something slightly off from that? I was thinking of having my wrench check timing next week and wanted to try and give him some guidelines.
Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 08-01-2007, 05:02 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
Crotchety Old Bastard
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Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
Every setup has its "sweet" spots. There are so many different cams, turbos, exhaust systems, A/F ratios, variables in general. The timing and CO affect the spool down noise you hear from the turbo when the ignition is shut off. For a "mild" engine the spool down noise goes away when the tuning is dialed in. That has nothing to do with the delayed fuel cutoff of the 930 pumps that can cause the chug to a stop phenomenon, separate issue.
I typically set the timing at 26* initially. Once the CO is set at 3% you can wiggle the timing a bit to find that "sweet spot" where it all comes together nice and does not detonate nomatter what the temperature is or grade of fuel used. Others may chime in with a different method.
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 08-01-2007, 05:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)

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