MK8 and mass air sensor tied to an a9p eec Reply #15 – May 05, 2018, 09:26:11 AM also,if i change to 30# injectors will the a9l or a9p eec be able to manage them?i know they are low resistance injectors,,,,the CFI 3.8L are high resistance but are 34# (green tops) which i have a couple dozen of).i also have a dozen CFI 5.0L 54lb which are also high resistance but what i have seen is the sefi 5.0,, all the injectors are low resistance. Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #16 – May 05, 2018, 09:44:04 AM Quote from: jcassity;465554when you say stock electronics,, you mean the eec ,, correct?No, I mean the from the MAF sensor.John Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #17 – May 05, 2018, 09:47:38 AM Quote from: jcassity;465555also,if i change to 30# injectors will the a9l or a9p eec be able to manage them?i know they are low resistance injectors,,,,the CFI 3.8L are high resistance but are 34# (green tops) which i have a couple dozen of).i also have a dozen CFI 5.0L 54lb which are also high resistance but what i have seen is the sefi 5.0,, all the injectors are low resistance.A9* all require High Z and as long as you have a MAF calibrated for 30 or whatever you end up running you should be able to manage.John Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #18 – May 05, 2018, 10:17:04 AM Quote from: Skunk;465557No, I mean the from the MAF sensor.Johnreword plsyou mean -use a stock stang mass air sensor? Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #19 – May 05, 2018, 11:03:49 AM Quote from: jcassity;465561reword plsyou mean -use a stock stang mass air sensor?I mean the electronics from the stock MAF get installed on the new housing if you go the sample tube MAF housing direction.Just reading Thunderjets posts....he brings up a good point about needing larger injectors. Yes the 24s will work fine up to around 300 hp. The problems arise at high RPM where there isn't enough time to squirt into the cylinder due to cam events. This is where you need a larger injector to deliver more fuel in less time.John Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #20 – May 05, 2018, 11:46:51 AM C&L MAFs reuse the stock electronics from an 89-93 5.0 Mustang MAF. You put the electronics in the C&L housing. The C&L unit has different size sample tubes that change the amount of air passing over the MAF sensor element, "calibrating" the signal back to the computer to compensate for larger injectors. This process works well for up to 30lb injectors. I discovered that the 24lb injectors on my car were too small when a friend hooked up his quarter horse to my car. Under high load, high rpm conditions the 24lb injectors were hitting 90% duty cycle. It's better to be in the 80% range. Swapped to 30lb red top injectors (used in 89-92 Thunderbird SCs) and I've yet to see over 75-80% duty cycle under the same conditions. It's a bit overkill but it's very safe.As far as a stock A9P controlling 30lb injectors with no tune, yes it'll work. Here's my car idling after a cold start. It has 30lb red top injectors, 76mm C&L MAF, stock replacement Motorcraft fuel pressure regulator, and NO computer tuning done. https://youtu.be/Z92w1Y0-E_4 Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #21 – May 05, 2018, 12:11:30 PM ok,, so i have the ebay maf which skunk said its for the sellers application plus for late 90's / early 2000's trucks.....and...i have 3 MKVIII mafs....so..dont i have enough mafs lying around that if i buy the C&L,, one of my maf's should work?,, assuming that i also upgrade to 30lb injectors? and i work in the correct sample tube??am i tracking this right? Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #22 – May 05, 2018, 12:19:54 PM also,,the larger the sample tube,, the leaner you are able to calibrate,,the smaller the sample tube,,, the richer you are able to calibrate,,and,,,,do you feel like the sample tube could be fabricated "as-bult" in my own shop to achieve a better running feel? Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #23 – May 05, 2018, 01:00:17 PM here are the maf's i havethe ebay one -xl3f-12b579-batwo MKviii-- f3vf-12b579-aaone u/k which i think might be a stock stang one,, smaller tube than the mk8' - f5uf-12b579-bawhich one to use on the C&L? Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #24 – May 05, 2018, 03:13:36 PM None of those will work for you. Your unknown is for a 96 truck. For any of them you will still need to define the Transfer function in the ECU.I took a quick glance and any of those meters will run you lean below 1.4 volts and pig rich above that voltage. If you run Mark8 computer with Mark8 MAF you can tweak from there with sample tubes.John Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #25 – May 05, 2018, 04:50:27 PM Quote from: Skunk;465573None of those will work for you. Your unknown is for a 96 truck. For any of them you will still need to define the Transfer function in the ECU.I took a quick glance and any of those meters will run you lean below 1.4 volts and pig rich above that voltage. If you run Mark8 computer with Mark8 MAF you can tweak from there with sample tubes.Johnjust to confirm,,,if i find the mustang maf,, and move forward i am going to be able to run fine with the right C&L sample tube,,correct? Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #26 – May 05, 2018, 06:23:15 PM Yes but specifically an 89-93 mustang.John Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #27 – May 06, 2018, 07:36:44 AM Or this and this.Ultimate control and part compatibility. I have a similar setup, I can share my tune with you and you should only need to swap the MAF transfer function for your Specific MAF and set the displacement to match your 331. Maybe a couple other small tweaks in the timing tables. Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #28 – May 06, 2018, 06:33:38 PM Quote from: TheFoeYouKnow;, I can share my tune with you and you should only need to swap the MAF transfer function for your Specific MAF s.[/QUOTEthats nice of you,, and thanks a lot!i am avoiding going down the road of software for my youngest son,, this is going to be his car and although we both have to deal with things geeky all the time,, we'd rather keep this as simple as possible. this will be his daily driver ...... soon enough hopefully. Quote Selected
MK8 and mass air sensor tied to an a9p eec Reply #29 – May 06, 2018, 07:21:28 PM I think it would make an invaluable learning opportunity. Digging your hands into a tune is the best way to really understand why an engine computer does what it does, how it makes it decisions, and what information is used and adapted to influence its judgment. You learn how it thinks. What I've learned tuning has made me a more effective technician, especially where an ECM becomes involved. Quote Selected
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