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Quicksilver77's Avatar
 
Join Date: Jan 2008
Location: Folsom, CA
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Calling all Sneaky smoggers!!

Hello all!
It is time for the good 'ol California smog check!
I went in for a pre-test and found that on the 2
speed dyno test my Carbon-Monoxide reading was too high, double what it
should be actually! My Hydrocarbon's and Nitrous-Oxide have a lot of
wiggle room to play with. My thought is that I can lean the AFR's out
a bit which will lower the HC's and CO's and let the catalytic converter
deal with the increased NO.
I do not at this time have an AFR gauge... so is there any quick
and dirty way of doing this without it?

Let me know if there is any other info you would like!
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Sean D. 1987 930
India Red/Beige/Black; Mahle 3.4L; Kokeln IC; K27 7200; GHL Headers; Borla Stainless Muffler; SC cams; Sachs Aluminum Clutch; Aluminum flywheel; Bilstein Sport Shocks; Adjustable Rear Sway Bar; Weltmeister Shock Tower Brace; Lowered and Corner Balanced; MOMO RSGT Seats...
Old 08-29-2008, 11:15 AM
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You can adjust the CO to lean (counter-clockwise) but only about 5 degrees. It is very sensitive. Your oxides of nitrogen should not go off the scale unless your combustion temperature spikes.
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'77 930 turbo Garretson I/C 1 BAR spring, (2) '82 Triumph Bonneville Royal Wedding Edition
Past rides: '74 914 1.9 liter twin plugged track car, '83 928S, '87 924S, '75 911S w '78 ROW 3.0, '72 911T, '70 911T and various other insignificant domestic examples. Happiness is a grey tailpipe! Turbo lag......it's worth the wait!
Old 08-29-2008, 12:46 PM
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Just unplugging an injector will help too if you have EFI.
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Norm '86 930
DTA P8Pro ECU - Synapse BOV - 60# Siemens inj - K27HF - Dual GHL - Kokeln IC - Elgin SC330 cams -
HRE 560R 8.5x18 ET25 11x18 ET0
https://flic.kr/p/nVgoAC
Old 09-02-2008, 04:29 PM
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Join Date: Mar 2006
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Send a message via AIM to Chuck Jones
I see you're in Folsom....I have a LM-1 with the sensor and 10 foot extension which I would be more than happy to loan you for your AFR's...

email me at fishoncj@aol.com if you'd like to borrow it.

Chuck...Elk Grove.
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1987 factory Slantnosed 930 Cabriolet/Guard's red
2002 Midnight Blue 996TT X50
1999 Iris Blue 996 (Dash fire burned and totalled 9/07)
Old 09-02-2008, 08:33 PM
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ALcohol.
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Old 09-03-2008, 02:12 PM
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Make sure you go out and flog the car beforehand, it really helps to have the engine fully warmed up. Thats how I passed in ATL without a cat, and no CO adjustment needed.
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87 930
96 BMW M3 Coupe
89 951
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Old 09-03-2008, 03:26 PM
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Exactly, pour a bottle of isopropyl alcohol in low tank of gas, drive it hard befor test. Good luck!!
Old 09-03-2008, 04:09 PM
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