5 speed mileage gains.
02-06-2011, 08:12 PM
#32
Nordschleife Master
I would have thought that the MAF would have been better as you are actually measuring the amount of air going into the engine.
I know that with some factory hop kits, like the older Ford GT-40 kits for the Mustangs we used to do changed from the stock MAP systems to MAF units.
I know that with some factory hop kits, like the older Ford GT-40 kits for the Mustangs we used to do changed from the stock MAP systems to MAF units.
A MAF system will automatically compensate for stronger/weaker engines, it also responds well to mods made, without the need for reprogramming. Meaning people like MK can get an increase in displacement, and not have the engine grenade. But a MAP system tells the computer instantly about a change in throttle based on the vacuum present. However, if you increase displacement from 5L to 6L you need to retune the map, as it wont have nearly enough fuel for that said motor.
As well, the technology behind the car electronics has made leaps and bounds in the past decade or two. Therefor being able to make use of the full advantage of the MAP sensors. I can tell you that with MAP on MSII, I could achieve amazing fuel economy, yet see zero effect on partial throttle acceleration. Yet with the MAF system, if I leaned it out to the area that I could with the MAP, it was a complete DOG at part throttle acceleration.
The sensitivity of the MAP is probably in the range of 100:1 to the MAF sensor from my observations of tuning.
02-06-2011, 08:14 PM
#33
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Dont some systems run both?
I seem to remember seeing that on some cars.
I seem to remember seeing that on some cars.
Each system has their own advantages and disadvantages.
A MAF system will automatically compensate for stronger/weaker engines, it also responds well to mods made, without the need for reprogramming. Meaning people like MK can get an increase in displacement, and not have the engine grenade. But a MAP system tells the computer instantly about a change in throttle based on the vacuum present. However, if you increase displacement from 5L to 6L you need to retune the map, as it wont have nearly enough fuel for that said motor.
As well, the technology behind the car electronics has made leaps and bounds in the past decade or two. Therefor being able to make use of the full advantage of the MAP sensors. I can tell you that with MAP on MSII, I could achieve amazing fuel economy, yet see zero effect on partial throttle acceleration. Yet with the MAF system, if I leaned it out to the area that I could with the MAP, it was a complete DOG at part throttle acceleration.
The sensitivity of the MAP is probably in the range of 100:1 to the MAF sensor from my observations of tuning.
A MAF system will automatically compensate for stronger/weaker engines, it also responds well to mods made, without the need for reprogramming. Meaning people like MK can get an increase in displacement, and not have the engine grenade. But a MAP system tells the computer instantly about a change in throttle based on the vacuum present. However, if you increase displacement from 5L to 6L you need to retune the map, as it wont have nearly enough fuel for that said motor.
As well, the technology behind the car electronics has made leaps and bounds in the past decade or two. Therefor being able to make use of the full advantage of the MAP sensors. I can tell you that with MAP on MSII, I could achieve amazing fuel economy, yet see zero effect on partial throttle acceleration. Yet with the MAF system, if I leaned it out to the area that I could with the MAP, it was a complete DOG at part throttle acceleration.
The sensitivity of the MAP is probably in the range of 100:1 to the MAF sensor from my observations of tuning.
02-06-2011, 08:32 PM
#34
Captain Obvious
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The MAP cars didn't like any upgrades so most have upgraded to a MAF setup (a simple wiring harness change). I managed to put an SC on my MAP car and it worked pretty well (put a checkvalve on the MAP vacuum line)......but at the end the engine block ckacked in half and drove the crank pulley into the rad.
02-06-2011, 08:44 PM
#35
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The couple I did you had to change the ECM, harness and a few other things when you did the upgrade with the heads, manifold and cam.
The only 5.0 Mustangs that had a MAP were the '86 and the '87s, after that, they were all MAF.
The MAP cars didn't like any upgrades so most have upgraded to a MAF setup (a simple wiring harness change). I managed to put an SC on my MAP car and it worked pretty well (put a checkvalve on the MAP vacuum line)......but at the end the engine block ckacked in half and drove the crank pulley into the rad.
The MAP cars didn't like any upgrades so most have upgraded to a MAF setup (a simple wiring harness change). I managed to put an SC on my MAP car and it worked pretty well (put a checkvalve on the MAP vacuum line)......but at the end the engine block ckacked in half and drove the crank pulley into the rad.
02-06-2011, 09:41 PM
#36
Nordschleife Master
there have been a number over the years which have run both yes.
And MAFs have changed design over the years to become more reliable. But that said, you also need to keep in mind, they arent looking for the maximum possible, or to squeeze the extra little bit out on most cars. So whatever is more cost effective is what is used.
That said, if you look at all standalone systems, they are all running MAP. With some retaining the ability to run MAF as well.
And MAFs have changed design over the years to become more reliable. But that said, you also need to keep in mind, they arent looking for the maximum possible, or to squeeze the extra little bit out on most cars. So whatever is more cost effective is what is used.
That said, if you look at all standalone systems, they are all running MAP. With some retaining the ability to run MAF as well.
02-06-2011, 10:26 PM
#37
Race Car
Dan
'91 928GT S/C
475hp/460lb.ft
02-07-2011, 02:09 PM
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Greg That is awesome! Can't wait to get the cars out and see you go by. Love that stuff. We need another get together when the weather gets nicer but it isn't 90 degree's outside!
