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Old 11-03-2014, 06:22 PM   #1
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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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Old 11-04-2014, 07:08 AM   #2
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Really. No one?
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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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Old 11-05-2014, 06:59 AM   #3
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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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Old 11-05-2014, 08:08 AM   #4
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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.
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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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Old 11-05-2014, 08:42 AM   #5
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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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Old 11-05-2014, 08:46 AM   #6
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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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Old 11-05-2014, 01:36 PM   #7
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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.
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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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Old 11-05-2014, 02:30 PM   #8
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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?
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Old 11-05-2014, 02:51 PM   #9
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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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Old 11-05-2014, 06:05 PM   #10
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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.
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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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