Whats the MAF w/ You October 22, 2005, 09:02:50 PM Well I finally logged into the new web site, and finally changed my duty station. Moved from Biloxi, Mississippi Just in time. Dragged that heavy T-Bird and all my racing junk across the United States to San Diego, CA to ship it off to Hawaii. Went to school for 6 months, and now I am back into a life living status in frickin Ewa Beach, Hawaii. I finally got that Bird off the trailer at the strip and blasted a 11.69 @114. I guess that sitting for a while helped something. The locals were astounded. There is not many fast street cars here cause it costs a boat load for shipping. Most people build lite big block cars here just for cost effectiveness. I am really writing because I need to know an answer to a question. Went to a Junktard here and there was 12 SC T-Birds. Some w/ SC some without. On Mikes home page he screwed 2 of those turds to a 351W and ran low 10's. I was thinking of the same thing so I picked up the blowers/ intercoolers/ and injectors and MAF w/ all ducting from 2 cars. I just wanted to install the injectors for now and the MAF, but found the MAF calibration is done by the computer on those cars. The injectors are all 30's from the 91 and older SC Birds. I just wanted to know if someone knew if the MAF was calibrated for any certain injectors or did ford just cheap out and install some cheap junk ones that are calibrated for who knows what??? Quote Selected
Whats the MAF w/ You Reply #1 – October 23, 2005, 12:40:33 PM None of the Ford MAFS are calibrated for a given size injector....all of that is done in the EEC programming. All Ford MAFS are actually highly precise insruments that output a very repeatable transfer function that will support the airflow demands of a given engine without pegging....the engineers then use that transfer function to write a fuel curve for the injector size that will be used. In other words...you're not going to able to take say a MAF from a Thunderbird SC and expect it to function properly in your Thunderbird just because you happen to be using injectors the same size. Quote Selected
Whats the MAF w/ You Reply #2 – October 23, 2005, 01:07:46 PM A different MAF sensor WILL change your fuel curve. Like Hawk said the initial calibration is in the ECU, however with a MAF sensor swap and the factory computer you can run different size injectors. The SC's ran 24#'s as far as I know. This chart has OE part # references for different MAF's: http://www.tomco-inc.com/Catalog/34mass%20air%20flow%20sensors.pdf Quote Selected
I am so confused????? Reply #3 – October 24, 2005, 01:53:23 AM SO I just need to buy a MAF that is calibrated for a 5.0 Mustang with 30# injectors so that it will function properly, I take it that the MAF is then only calibrated for the engine type based on the injectors, load, timing advance and volumetric cfm injested by the engine from idle to wide open throttle. I was always under the impression that it just created a voltage ratio based upon air movement through the sampling tube in relation to 12 volts. 12 volts being maximum airflow 0 being not running. I have been tpuppies the voltage signal with a variable resistor to obtain the correct a/f ratio. Is this not good practice, or does that just calibrate the MAF to my exact setup? Quote Selected
Whats the MAF w/ You Reply #4 – October 24, 2005, 04:12:57 AM QuoteI have been tpuppies the voltage signal with a variable resistor to obtain the correct a/f ratioThis is exactly how aftermarket MAF's work. Nothing wrong with what you're doing, in fact hats off to you for saving cash!This method only works up to a point however. Your gonna have problems runnin 42 pound injectors on a stock computer. The best solution would be a cutom program, but are you gonna do that every time youdo a modification?Once you get that radical ypur gonna need a custom setup of some sort.http://www.sensorland.com/HowPage060.htmlhttp://fordfuelinjection.com/index.php?p=26http://www.mustangworks.com/articles/electronics/InductionBlues.html Quote Selected
MFing MAF Reply #5 – October 25, 2005, 03:01:39 AM well I am at witts end with my car, then If I am unable to change the MAF with out spending boat loads of cash figuring out this problem, 2 years ago the car ran just fine at the track until one night, I made a pass and the car ran 7.30 in the 1/8th and the following pass it went 7.80 and lost all of its low end torque. I thought that maybe I damaged my stock torque converter with all the low end that nitrous builds, so I bought a nitrous converter with 2600 stall, well the problem still existed 2.20 short times on the motor and a miss at idle was noticed, well checked the plugs, coil, ignition box. nothing, injectors swapped, nothing, time for compression test, nothing, checked fuel pressure, nothing, no codes no lights, just embarrasingly slow short times. well I thought maybe drive train, checked the rearend, nothing, maybe the brakes are dragging, nothing, well I do not know, as time went on I was somewhat able to tune the nitrous system around the problem, ran good on the bottle, but my tow rig would give it what for on the motor. still runs 13.80 with a 2.20 short time at 105, it pulls like hell on the top end. This has got to be a MAF issue, I think that it is too rich down low and then leans out the more RPM it winds. maybe the signal wire to the EEC that reads RPM got pinched but I would think that I would have a code. I had a chip burnt last year and the car idles better and is more manageable in town, but yet the same problem still persists. driving down the road if I am already moving the car runs like a raped ape. but from a dead start a 3year old on a tricycle would lay me out for 60 ft. this would be great for the stock 2.73 gears but I have 4.10's. the car is so close to getting a fricking carb it has no idea. I was thinking that the MAF is hosed, maybe it is giving a signal that is within tolerance for the EEC but the voltage does not move in relation to air flow. I do not know where to go anymore and I have too much wrapped up in fuel injection to just give the stuff away for pennies on the dollar. Quote Selected
Whats the MAF w/ You Reply #6 – October 25, 2005, 08:36:18 AM Quote from: Paul FlockhartThe SC's ran 24#'s as far as I know. Nope, the early SC used 30lb inj(red), while the late(94-95)used 36lbers(dark blue). The 24lb inj are a medium blue.LightningbirdSo what EEC, MAF, and injectors are you currently running??????????? Getting another MAF for the 30lbers isn't a problem. I believe even Summit has them these days. Quote Selected
Whats the MAF w/ You Reply #7 – October 26, 2005, 12:01:44 AM right now I am running a A9M EEC with 24# injectors and a PRO-M 75mm Mass Air Meter that was supposedly calibrated for 24# but I need to junk it, I think that it is bad, I still am not getting a code but all problems point to the MAF. I cannot tell what is exactly wrong and the code puller will not show a problem. When I stand on the gas it feels like the timing is retarded 100000000 degrees and the car is really rich @ idle then leans out on top end and will not pull beyond 5500 rpm. I do not know how to test the MAF voltage to ensure the meter it functioning correctly. Quote Selected
Whats the MAF w/ You Reply #8 – October 26, 2005, 08:35:44 AM Quote from: Lightningbirdright now I am running a A9M EEC with 24# injectors and a PRO-M 75mm Mass Air Meter that was supposedly calibrated for 24#.Thats the exact same combo I have. Mine also seems a little rich on the bottom, but will at least pull 1.9 sixtys and runs hard to the EECs 6250 redline(fuel cut off) with no problem. Looks like you need to try another meter. I'd get one for the 30lb inj as you can use it with the SCs you are thinking about installing. Quote Selected
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