11-03-2014, 06:22 PM
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#1
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Safe afr's and timing ?
My car is a 3.4. I am running 12.8-13.0 afr and 22degrees of timing above 6krpm. What is safe and what is normal and what is the best performance. Thanks in advance.
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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11-04-2014, 07:08 AM
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#2
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Really. No one?
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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11-05-2014, 06:59 AM
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#3
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Registered User
Join Date: May 2011
Location: weehawken nj
Posts: 240
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How are you adjusting ignition timing?
I guess you just advance the timing until it starts to knock, and then back off a few degress... just like the good ol days
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11-05-2014, 08:08 AM
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#4
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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I can not adjust the tables. I can manipulate the maf. I am interested in the numbers that are safe and good for best performance.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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11-05-2014, 08:42 AM
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#5
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Registered User
Join Date: Sep 2009
Location: toronto
Posts: 2,668
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I seemed to recall a guy called the quickcuban who worked with MAF manipulation for his 3.4 swap. He was in excellence....might have his contact info
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986 00S
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11-05-2014, 08:46 AM
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#6
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Registered User
Join Date: Sep 2009
Location: toronto
Posts: 2,668
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Sent you a PM for the contact I hope he will answer you.....as has been through it
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986 00S
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11-05-2014, 01:36 PM
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#7
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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I have spoken to him many times. I have had my 3.4 for almost 5 years now. It is tuned to a safe number on the afr's I just wanted to know what are it's limits. Like can I push it to 13.5:1 or will the thing melt and also with what kind of timing should I be looking to be around.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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11-05-2014, 02:30 PM
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#8
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Engine Surgeon
Join Date: Aug 2008
Location: Cleveland GA USA
Posts: 2,425
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13:1 is magical for these engines, BUT according to where you are sampling, the values might not be correct. Few people realize the catalytic converter role and how it effects pre and post cat AFR.
Do you have a lightweight flywheel? Do you have solid/ semi- solid motor/ trans mounts?
__________________
Jake Raby/www.flat6innovations.com
IMS Solution/ Faultless Tool Inventor
US Patent 8,992,089 &
US Patent 9,416,697
Developer of The IMS Retrofit Procedure- M96/ M97 Specialist
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11-05-2014, 02:51 PM
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#9
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Registered User
Join Date: Apr 2010
Location: Canada
Posts: 3,121
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some widebands (plx I believe) have a narrowband output so that you can replace one of your pre-cat narrowbands with the wideband and still send the proper signal to your ecu - that is, no additional bungs to weld on.
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11-05-2014, 06:05 PM
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#10
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Pre cat and 987 mount and stock tranny mounts. No worries on the knock there hopefully with this setup. Jake thank you for answering my question. Stock flywheel. Remember I sent you my aasco.
__________________
996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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