ok i have an 88 GT with a 306, an Ecam and other bolt on mods anyway the car has 24lb injectors..... the MAF is calibrated for 19's im not positive how big the MAF is or if its stock but i want to know from people who have already upgraded like that , how much of a power or running difference should i expect? the car is running very rich now the unburned fuel smell is very potent will the upgraded MAF solve that problem? i am also about to buy a 93 cobra maf calibrated for 24lb injectors that is a 70mm. will this be the best idea to stick with a factory unit?



any info or suggestions will help THANK YOU!!

 

Traditional Ford ECC-IV tuning suggest you get a MAF calibrated for your injectors. Another option is to upgrade your ECC-IV to ECC-V and have it tuned for your setup. And yet another, perhaps the best option, is to upgrade to Megasquirt 2. Megasquirt 2 is primarily a speed density ECU, but it can use MAF too, however speed density is better for power and you can toss your MAF.

Costwise, from cheap to rich you have calibrated MAF, Megasquirt 2, ECC-V. Powerwise, from least to most you have calibrated MAF, ECC-V, Megasquirt 2. Hasslewise, from easy to PITA you have calibrated MAF, Megasquirt 2, ECC-V.

 

I thought speed density was thrown out the door in favor of MAF because MAF is more accurate. also, I thought mass air was not around until somewhat after 88.
why is speed density better for power than MAF? wouldn't the best thing for the motor be to know more exactly how much air is coming into the motor?

 

oh yeah i forgot to add my 88 has already been converted to mass air so that might clear things up... and yeah im not too familliar with anything about the mass air so if you could just stick to the size and injector calibration that would be fine thanks

 

your only 2 options is to find a maf from a 93 cobra or buy a c/l maf with the 24# sample tube..

 

The answer I got is speed density will produce more power as there is no restriction in air flow. MAF will run consistantly as the car wears, that will make you pass emissions tests down the road without retuning. A higher flowing MAF will not measure air at idle accurately. With MAF you only need to calibrate the MAF itself, after that you somewhat have an idea of the airflow, with speed density the entire engine is getting calibrated to get airflow. However as engine wears down you need to keep retuning. In other words MAF is calibrated and it's hard to tune with it, MAP is the vacuum pressure of your engine and thus as engine parameters change so does the vacuum, you can tune more accurately with MAP.

MAF improves emissinos, but restrics airflow, and it is hard to tune with MAF.

Some modern cars prefer speed density, for example Dodge Neon, SRT-4, and I'm sure other Dodges too.

Lesten to this is technology that replaces some stuff is not necessarily better. Another example of such replacement is coil over plug ignition, old waste spark EDIS-8 worked great for up to 10,000 rpms, the new COP can go twice that fast, but it is there for diagnosing propuses, now dealer can pin point which cylinder has problems with ignition, drawback is it cost more.



If you want to keep things simple KillSwitchNY. 65mm MAF will be more than enough for up to 350 horses. Getting a larger MAF will be a waste of money.