Quick MAF ?
04-12-2008, 02:47 PM
#1
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Join Date: Mar 2008
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Posts: 22
Quick MAF ?
On a MAF Meter what determines the size injector it should be used for? Is it the size of the MAF or something else? I hear people saying that you can recalibrate the meters to use different size injectors, what do they change on them in order to use different injectors?
04-12-2008, 05:20 PM
#3
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Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
RE: Quick MAF ?
The only meter that can be 'Re-calibrated' with the use of sample tubes is C&L.
These are mass produced cheap meters. They will work for many applications, but there are better products out there.
This is a bit of a pet peeve of mine, so please allow me to rant a little [8D]
The aftermarket Mustang MAF industry has completely destroyed the meaning of the word CALIBRATE.
The aftermarket meters tell you that their MAF meter is 'calibrated to 24's', but what they really mean is that their meters output is offset in order to trick the ecu into ending up near stoich.
A true calibration requires the meter to be in the system in which it will be used (or atleast something VERY close to it).
I'll stop there, as I'm sure no one cares...
Basic answer to the OP...
You cannot swap a sensor from housing to housing. Even if the sensors are the same part number, as the sensor and housing are calibrated as a set.
Another part of the so called aftermarket calibration is of course the injector size.
Often forgotten however is the ecu's role in the aftermarket 'calibration'.
A 36Lb MAF for a A9L will not be the same as a 36Lb MAF for an X3Z...
jason
These are mass produced cheap meters. They will work for many applications, but there are better products out there.
This is a bit of a pet peeve of mine, so please allow me to rant a little [8D]
The aftermarket Mustang MAF industry has completely destroyed the meaning of the word CALIBRATE.
The aftermarket meters tell you that their MAF meter is 'calibrated to 24's', but what they really mean is that their meters output is offset in order to trick the ecu into ending up near stoich.
A true calibration requires the meter to be in the system in which it will be used (or atleast something VERY close to it).
I'll stop there, as I'm sure no one cares...
Basic answer to the OP...
You cannot swap a sensor from housing to housing. Even if the sensors are the same part number, as the sensor and housing are calibrated as a set.
Another part of the so called aftermarket calibration is of course the injector size.
Often forgotten however is the ecu's role in the aftermarket 'calibration'.
A 36Lb MAF for a A9L will not be the same as a 36Lb MAF for an X3Z...
jason
04-12-2008, 06:48 PM
#4
Thread Starter
Join Date: Mar 2008
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Posts: 22
RE: Quick MAF ?
Thanks for the information. Right nowI have aMAF that is for 24 lb injectors butI have 19 lb injectors in it right now. IfI do not put in a 19 lbMAF what will happen? Right nowI do not have enough HP to put in the 24 lb injectors that is why they are not in.
04-12-2008, 10:01 PM
#5
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Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
RE: Quick MAF ?
Running 24Lb injectors with a 19Lb MAF wouldn't be a good way to go...
Without the 24Lb MAF used to lie to the computer about airflow, the ecu will run rich.
Approximately,
1 - (24/19) x 100 = 26% Rich
The ecu can only compensate for 12.5% rich
Basically, you would max out the adaptive ability of the ecu, and still be 13.5% from stoich.
IOW, you won't like it...
What brand MAF do you have now?
What ecu do you have?
Without the 24Lb MAF used to lie to the computer about airflow, the ecu will run rich.
Approximately,
1 - (24/19) x 100 = 26% Rich
The ecu can only compensate for 12.5% rich
Basically, you would max out the adaptive ability of the ecu, and still be 13.5% from stoich.
IOW, you won't like it...
What brand MAF do you have now?
What ecu do you have?
04-12-2008, 10:38 PM
#6
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Join Date: Mar 2008
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Posts: 22
RE: Quick MAF ?
I'm running a 24lb MAF with 19lb Injectors. The MAF is a C&L 73MM (24lb) and I believe the ECU is a A9P, does that sound right for the ECU? Should I buy a 19lb MAF or should I put the 24 lb Injectors in?
04-12-2008, 10:58 PM
#7
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Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
RE: Quick MAF ?
Sorry, I guess I misread what you were doing. [&:]
A9P does sound right.... Is your car an auto?
For cost reasons I have3 suggestions...
1. Run the 24LbInjectors (with the C&L)and see how it goes. Depending on your setup, it could run ok, or it could cause some issues.
2. Stick with the 19's and run a STOCK Ford MAF meter. You should be able to find a 70mm/F2VF MAF for around $25, which will work well with the A9P & 19's. (this isn't stock for your vehicle, but by pure coincidence Ford programmed the output of this meter to be nearly identical to that of your stock meter in your 89)
3. Buy a different sample tube for the C&L meter, which will get you the 19Lb calibration. Again, depending on MANY variables, it could run ok, or this could cause issues.
Here is the C&L calibration page...
http://www.cnlperformance.com/calibration.html
I would prefer to use the 70mm/F2VF with 19Lb Injectors option, if it were MY car, but the choice is ultimately yours.
A9P does sound right.... Is your car an auto?
For cost reasons I have3 suggestions...
1. Run the 24LbInjectors (with the C&L)and see how it goes. Depending on your setup, it could run ok, or it could cause some issues.
2. Stick with the 19's and run a STOCK Ford MAF meter. You should be able to find a 70mm/F2VF MAF for around $25, which will work well with the A9P & 19's. (this isn't stock for your vehicle, but by pure coincidence Ford programmed the output of this meter to be nearly identical to that of your stock meter in your 89)
3. Buy a different sample tube for the C&L meter, which will get you the 19Lb calibration. Again, depending on MANY variables, it could run ok, or this could cause issues.
Here is the C&L calibration page...
http://www.cnlperformance.com/calibration.html
I would prefer to use the 70mm/F2VF with 19Lb Injectors option, if it were MY car, but the choice is ultimately yours.
04-12-2008, 11:11 PM
#8
Thread Starter
Join Date: Mar 2008
Location:
Posts: 22
RE: Quick MAF ?
Thats what I was thinking, buy a stock MAF. I found a meter that is 70 MM and for 19 lb injectors, it is identical to a 93 Cobra. Would that work? It is on ebay, item# 280217096911.
http://cgi.ebay.com/ebaymotors/93-Mu...spagenameZWDVW
By the way thank you for the help, very helpful.
http://cgi.ebay.com/ebaymotors/93-Mu...spagenameZWDVW
By the way thank you for the help, very helpful.
04-12-2008, 11:17 PM
#9
3rd Gear Member
Join Date: Nov 2007
Location: Washington, Seattle
Posts: 551
RE: Quick MAF ?
$70 is pretty high for a used stock MAF.
AND, there is no telling how they 'calibrated' that meter for 19's....
If you are interested, then send them a question asking for all the part numbers on the sensor.
If there is an 'F2VF' in there, and an 'afh70' then you should be ok with it.
AND, there is no telling how they 'calibrated' that meter for 19's....
If you are interested, then send them a question asking for all the part numbers on the sensor.
If there is an 'F2VF' in there, and an 'afh70' then you should be ok with it.