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Certifiable
Join Date: Jan 2008
Location: Folsom, CA
Posts: 194
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Adjusting the AFR's?
Hello again folks!
I know I am a total FNG before I ask this, but I need to adjust the AFR's to cure a hunting idle... and well... I need some help locating the proper screw to turn... (left lean, right rich correct?) anyone have a picture to help a noob out? Thanks in advance! -Sean I hope the dumb questions of mine stop soon! I feel like a tool!
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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... |
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03-17-2008, 12:01 PM
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Crotchety Old Bastard
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Not my picture but an excellent example.
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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 |
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03-17-2008, 02:01 PM
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Certifiable
Join Date: Jan 2008
Location: Folsom, CA
Posts: 194
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Thanks a ton Brian!
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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... |
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03-17-2008, 07:11 PM
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Forced Induction Junkie
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Do a click at a time...... a little goes a long way.
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Dave '85 930 Factory Special Wishes Flachbau Werk I Zuffenhausen 3.3l/330BHP Engine with Sonderwunsch Cams, FabSpeed Headers, Kokeln IC, Twin Plugged Electromotive Crankfire, Tial Wastegate(0.8 Bar), K27 Hybrid Turbo, Ruf Twin-tip Muffler, Fikse FM-5's 8&10x17, 8:41 R&P |
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03-18-2008, 07:06 AM
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Certifiable
Join Date: Jan 2008
Location: Folsom, CA
Posts: 194
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I will absolutely take it easy on the turning of the fuel mixture screw...
In fact if I can't get the idle cleaned up with in a click or two left... I will run it to the local indy for a quick once over with the CO meter. Thank you for your advise! -Sean
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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... |
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03-18-2008, 11:03 PM
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Smart quod bastardus
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Make sure you don't have a vacuum leak first, otherwise you may still have the problem.
What makes you sure the idle screw needs turning, did you take a CO reading already?
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max ---"When you're racing it's life! Anything else either before or after, is just waiting" |
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03-19-2008, 07:51 AM
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A fellow Pelacanite
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Remember that you need to gently push down with the allen key and then turn it so that the allen bolt which is spring loaded upwards engages into the slot below it before you actually make an adjustment.
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1981 UK 930. G50/01 shortened, 964 3.8RS Fibreglass Body Kit, 18" Alloys 8.5" F & 10" R, 225's F & 285's R, Special Colour Metallic Blue Paint, FIA Sparco Evo's, A/C and Air Pump removed, Electronic Boost Controller, GHL Headers, Tial46 WG. Fitting - New service kit. Needs Fitting - Innovate XD-16 Kit, Kokeln IC. Stephen's K27 HFS, EVO Intake Assy & his Modded USA Fuel Head. 1983 UK 911 3.2 Carrera Sport Coupe. Black, Black Leather with Red Piping, Black Alloy Gear Knob, K&N Air Filter Element, Turbo Tie rods. Needs Fitting - K&N CO Sensor, Round A/F Dial Gauge, Factory Short Shift Kit. http://www.danasoft.com/sig/Iamnotanumber.jpg |
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03-19-2008, 10:18 AM
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Certifiable
Join Date: Jan 2008
Location: Folsom, CA
Posts: 194
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Fredmeister,
I did the starter fluid trick-a-roo, and noticed no perceptible change in idle, or the fluctuation thereof after spraying everywhere. (Hopefully eliminating the vacuum leak possibility?) She is experiencing hard cold starts, and I have the very strong scent of fuel at start up, and idle, with the idle fluctuating between 800-1050 rpm. Which leads me to believe that the I am on the rich side. (Is my diagnosis sound? I'm still a FNG!) I am going to take her in for a little dyno/AFR work Monday to get everything dialed in on the 91 octane fuel, and verify the AFR's under load, but I figured in the meantime I will give it a click, or two, toward the lean end of things to try to cure the hunting idle. Until everything is sorted on Monday I will be off high boost levels and just tooling around town, if I do take her out. Thanks for your advise! NathanUK, Thank you very much for the tip!
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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... |
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03-19-2008, 10:29 PM
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Smart quod bastardus
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Sounds like you are not so bad after all. You seem to have a good grasp on things.
It is tuff to work on adjusting these cars without the equipment. I won't touch mine till I get a good A/F meter system so that I can measure things to see what really is happening. It is too easy to screw things outta whack without gages. Remember to count the number of clicks from where you started so that at least you have a reference point to go back to. You should run a check on system pressures as well. Get yourself a CIS testing kit and makes sure the injection pressures are set correctly. Cold system, warm system and Control pressures need to be in spec before going anywhere from there.
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1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, full bay intercooler, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.95 bar max ---"When you're racing it's life! Anything else either before or after, is just waiting" |
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03-20-2008, 03:24 PM
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78 Porsche 911SC 3.0L, 3.3Turbo soon. 
1985 Porsche 930 Fac. Slantnose 3.3l
Herman the German
