rel3rd
03-18-2006, 09:42 PM
I figured this may be the best place to ask, since some guys are running Speed Density on their Factory Stock cars...
In the past, I've had a few Mustangs that I wound up converting from the stock SPEED DENSITY setup to a MASS AIRFLOW setup. I am 99% sure that along with adding the 4 wires for the mass air meter's sensor connection, I also had to switch a few wires around in the harness. If I did a MASS AIR to SPEED DENSITY conversion, wouldn't I also have to swap these wires around???
Reason for asking, in my quest for stock engine 12's, I tried the MAF to SD swap, but all I did was unplug the maf meter and remove it from the intake tract, and also hooked vacuum to the BAP sensor, which made it into a MAP sensor...The car never seemed to run right and according to my track numbers, I was right...I'm thinking that either the wires had something to do with it, or the fact that supposedly the SD cars run leaner than their mass air counterparts, and the car was maybe just TOO LEAN to make more power. Unfortunately, I didn't have a way to adjust fuel pressure manually for the WOT dragstrip runs, so I basically got pissed and swapped it back to mass air....car immediately picked up the power it had lost.
I "thought" the wires that were switched around were just something to do with the EGR or Thermactor, but I am not positive...it's been a while since I've done a mass air conversion...AIR pump stuff is all gone anyway, but Thermactor "stuff" is still in place on passenger side strut tower.
Could either theory I have, be the cause of the car not gaining the power everyone thought it would gain?
Any insight is greatly appreciated...
BTW, Engine is 100% stock, which was why I even considered trying to run speed density. And possibly of importance, the car seemed to have a very definitive dead spot between gear shifts at WOT...like a lean stumble you'd get in an old 4 barrel car...
In the past, I've had a few Mustangs that I wound up converting from the stock SPEED DENSITY setup to a MASS AIRFLOW setup. I am 99% sure that along with adding the 4 wires for the mass air meter's sensor connection, I also had to switch a few wires around in the harness. If I did a MASS AIR to SPEED DENSITY conversion, wouldn't I also have to swap these wires around???
Reason for asking, in my quest for stock engine 12's, I tried the MAF to SD swap, but all I did was unplug the maf meter and remove it from the intake tract, and also hooked vacuum to the BAP sensor, which made it into a MAP sensor...The car never seemed to run right and according to my track numbers, I was right...I'm thinking that either the wires had something to do with it, or the fact that supposedly the SD cars run leaner than their mass air counterparts, and the car was maybe just TOO LEAN to make more power. Unfortunately, I didn't have a way to adjust fuel pressure manually for the WOT dragstrip runs, so I basically got pissed and swapped it back to mass air....car immediately picked up the power it had lost.
I "thought" the wires that were switched around were just something to do with the EGR or Thermactor, but I am not positive...it's been a while since I've done a mass air conversion...AIR pump stuff is all gone anyway, but Thermactor "stuff" is still in place on passenger side strut tower.
Could either theory I have, be the cause of the car not gaining the power everyone thought it would gain?
Any insight is greatly appreciated...
BTW, Engine is 100% stock, which was why I even considered trying to run speed density. And possibly of importance, the car seemed to have a very definitive dead spot between gear shifts at WOT...like a lean stumble you'd get in an old 4 barrel car...