What size (OEM) MAF does the '03 Cobra come with?
- Thread starter DAP
- Start date
-
Sponsors (?)
RedSquad7
Member
MAFS are not calibrated to a injector size. They have a transferfunction that is put into the computer and so is the injector size. follow the link for a explantion on how maf work.
Http://www.tccoa.com/articles/intake/index.html
Http://www.tccoa.com/articles/intake/index.html
Vic_Ferrari
New Member
Your C&L will need a custom program by someone capable.
I know this sounds basic, but most custom tuners don't have a clue how to set up the transfer function properly.
I wouldn't use the MAF upgrade until I had the pulley, and even then I would only use it if the factory unit ran out of counts.
My mod list includes a STOCK mass air.
If I reach for more airflow, I will need a mass air upgrade.
This has nothing to do with the SIZE of the mass air.
90MM is big enough for gobs of HP.......but the electronics are limited within the factory unit.
I know this sounds basic, but most custom tuners don't have a clue how to set up the transfer function properly.
I wouldn't use the MAF upgrade until I had the pulley, and even then I would only use it if the factory unit ran out of counts.
My mod list includes a STOCK mass air.
If I reach for more airflow, I will need a mass air upgrade.
This has nothing to do with the SIZE of the mass air.
90MM is big enough for gobs of HP.......but the electronics are limited within the factory unit.
RedSquad7
Member
Vic_Ferrari
New Member
..
Meat.....
I have some data acquisition that will show if you are close to running out of counts.
If I were to port the blower and add a lower pulley or upgrade to a whipple or KB, I would require a mass air upgrade...not because of size, but because of electronics.
Blown96bird....
Better do some homework.
MAF's can be calibrated by their manufacturer for a specific injector size. This doens't necessarily mean the transfer function doesn't need to be changed, and it doesn't necassarily mean it as to be the same injector size the car has....as long as the tuner knows what he has.
Lets say you have a MAF calibrated for 42 LB injectors but you have 36's.
Or, you could have a MAF calibrated for 42s and actually have 42's.
Both may run just fine, but will require a different transfer function and changes in injector control. One may run great on the stock transfer fuction.....but require other changes.
It is very possible (and sometimes likely) that you can buy a MAF calibrated for a cetain injector size and not have to change the transfer function, but you may have to adjust injector mins/max, pulsewidth, whatever.
I'm not being specific here again for proprietary reasons.....
Just wanted to clear up an incorrect statement.
You can in fact have a mass air calibrated for a specific injector size and this is actually the quinessential question when doing an offsite (or without a dyno) custom program for a vehicle with a mass air upgrade.
First question from the tuner should be......What size injector is the MAF calibrated for?
Meat.....
I have some data acquisition that will show if you are close to running out of counts.
If I were to port the blower and add a lower pulley or upgrade to a whipple or KB, I would require a mass air upgrade...not because of size, but because of electronics.
Blown96bird....
Better do some homework.
MAF's can be calibrated by their manufacturer for a specific injector size. This doens't necessarily mean the transfer function doesn't need to be changed, and it doesn't necassarily mean it as to be the same injector size the car has....as long as the tuner knows what he has.
Lets say you have a MAF calibrated for 42 LB injectors but you have 36's.
Or, you could have a MAF calibrated for 42s and actually have 42's.
Both may run just fine, but will require a different transfer function and changes in injector control. One may run great on the stock transfer fuction.....but require other changes.
It is very possible (and sometimes likely) that you can buy a MAF calibrated for a cetain injector size and not have to change the transfer function, but you may have to adjust injector mins/max, pulsewidth, whatever.
I'm not being specific here again for proprietary reasons.....
Just wanted to clear up an incorrect statement.
You can in fact have a mass air calibrated for a specific injector size and this is actually the quinessential question when doing an offsite (or without a dyno) custom program for a vehicle with a mass air upgrade.
First question from the tuner should be......What size injector is the MAF calibrated for?
Raw Lifter
New Member
- Jan 1, 2004
- 55
- 0
- 0
Vic_Ferrari
New Member
boost
Doesn't surprise me.....I've seen it happen.
Everyone keeps talking boost.....remember, boost is pretty much irrelevant.
Boost is nothing but a measure of backpressure in the system from a given mass or air coming in.
here's why I don't like going by PSI:
My boost dropped by over 1 psi with the headers, but I'm now CLOSER to pegging the MAF.
Why?
The MASS of air coming in is greater and is less restricted, hence the drop in manifold pressure....but it's still getting more air (and the proof is in the MAF voltage/counts)
This is why you see blowers other than the eaton making stupid power at 14 psi....it's a greater mass of air than the eaton can produce at that PSI.
it's also another reason why a ported eaton works so much better.
Doesn't surprise me.....I've seen it happen.
Everyone keeps talking boost.....remember, boost is pretty much irrelevant.
Boost is nothing but a measure of backpressure in the system from a given mass or air coming in.
here's why I don't like going by PSI:
My boost dropped by over 1 psi with the headers, but I'm now CLOSER to pegging the MAF.
Why?
The MASS of air coming in is greater and is less restricted, hence the drop in manifold pressure....but it's still getting more air (and the proof is in the MAF voltage/counts)
This is why you see blowers other than the eaton making stupid power at 14 psi....it's a greater mass of air than the eaton can produce at that PSI.
it's also another reason why a ported eaton works so much better.
Vic_Ferrari said:
Oh I understand and agree with what your saying Vic. I was just surprised to hear this is all. There are guys out there running KB equipped Cobra's with full exhaust & intake (headers, mid-pipe, cat back, CAI & TB) and they aren't pegging the MAF according to the data logging being done. I was just suprised to hear you were so close to doing so with your current combination.
U.M.
Vic_Ferrari
New Member
There are a few things that can be done to the transfer function to help the issue with pegging the stock mass air, but if you have a KB and want it tuned correctly, you will need a mass air upgrade.
Raw Lifter
New Member
- Jan 1, 2004
- 55
- 0
- 0
Uncle Meat said:
Yep, Metco 6lb lower pulley, bassani mid lengths, x cats and cat back...cold air kit, accufab tb and a superchip programer....472 rwhp
Vic_Ferrari
New Member
...
Well, you can make it run on the stock mass air....doesn't mean it should run this way.
If you peg the maf and manipulate the other table it refers to when it pegs the maf....you can maipulate it just right......until conditions change and it can't compensate because the MAF doesn't know the difference anymore.
Hell, you can make it run 9:1 when it pegs the maf if you want to get silly to make a point.....doesn't mean it's right.
Ever notice you have a lot more power on a cold day? YOu know of course that colder air is more dense.....yadda yadda yadda
The MAF recognizes this extra mass of air when it is not pegged.
When you are pegged and using the other table, it will run best within the conditions it was tuned in ONLY. Got pray for anyones soul who does this.
You can make it look GREAT on the dyno and feel great on the street).....then comes that really cold day, or a slight change in modifications or fuel quality......
How lean can an 03 run before it blows?
I'd rather not know.
Uncle Meat said:
Well, you can make it run on the stock mass air....doesn't mean it should run this way.
If you peg the maf and manipulate the other table it refers to when it pegs the maf....you can maipulate it just right......until conditions change and it can't compensate because the MAF doesn't know the difference anymore.
Hell, you can make it run 9:1 when it pegs the maf if you want to get silly to make a point.....doesn't mean it's right.
Ever notice you have a lot more power on a cold day? YOu know of course that colder air is more dense.....yadda yadda yadda
The MAF recognizes this extra mass of air when it is not pegged.
When you are pegged and using the other table, it will run best within the conditions it was tuned in ONLY. Got pray for anyones soul who does this.
You can make it look GREAT on the dyno and feel great on the street).....then comes that really cold day, or a slight change in modifications or fuel quality......
How lean can an 03 run before it blows?
I'd rather not know.
