whats the deceleration air setting thats listed in my safc-II



i read thd manual and of course it meant nothign to me





my car backfires/ throws flames alot, and im hoping this will aid in helping that



im running rich which is why i think the backfiring happens most of the time, but i would still like to know what the feature does, and how to effectivly use it



i mean i know nothing about deceleration air, so maybe someone would be so inclined to tell me ???





thanks!



=-dustin

[quote name='fitness stain' date='May 10 2005, 06:52 PM']whats the deceleration air setting thats listed in my safc-II



i read thd manual and of course it meant nothign to me

my car backfires/ throws flames alot, and im hoping this will aid in helping that



im running rich which is why i think the backfiring happens most of the time, but i would still like to know what the feature does, and how to effectivly use it



i mean i know nothing about deceleration air, so maybe someone would be so inclined to tell me ???

thanks!



=-dustin


[/quote]



those are for map type air flow meters. We have the flap or the cone. Does not apply for rx7s.

It depends how it was hooked up, I know some ppl hook them up to use the map sensor on 7's it is supposadly more accurate under boost.

well poo noise ...



thanks guys!

[quote name='fc3s4utnv' date='May 10 2005, 04:32 PM']It depends how it was hooked up, I know some ppl hook them up to use the map sensor on 7's it is supposadly more accurate under boost.


[/quote]



I think you confusing the use of the pressure signal in place of the TPS signal.

It can make the transition from the low map to the high map happen only under high boost.

You still need the AFM input set to "flap".

Backfires or "afterburn" will happen when there is fuel in the exhaust during deceleration.

Possible causes:

Atmospheric blow-off valve.

Problems with the TPS.

Slow or mis-adjusted throttle closing dash pot.

Removed ACV and/or air pump.

[quote name='sureshot' date='Jun 2 2005, 11:02 AM']Backfires or "afterburn" will happen when there is fuel in the exhaust during deceleration.

Possible causes:

Atmospheric blow-off valve.

Problems with the TPS.

Slow or mis-adjusted throttle closing dash pot.

Removed ACV and/or air pump.


[/quote]



https://www.nopistons.com/forums/pub...IR#>/boink.gif

The deceleration air control is for HOT WIRE type sensors.



It won't do anything for you, so don't worry about it. Unless you've done something like put a Mustang AFM with appropriate adapter circuitry in, at which point you'd likely know what you were doing with it anyway (it's far from a straight swap).



As for using the pressure sensor vs the TPS: I recommend using the pressure sensor. Engine operation is actually based on manifold pressure, not throttle position. At low RPM, you reach full manifold pressure very early on in the throttle throw - 30% throttle may be 100% manifold pressure at 2000 RPM. The other 70% of throttle does nothing (and actually may reduce power slightly by opening the secondaries up more and reducing primary port velocity). By using the pressure sensor, your fuel corrections are adjusting based on what actually matters, not the rather artificial throttle setting.



Also, for those using the SAFC to enrich the fuel mixture under boost, using the pressure sensor is the only way to go for accurate results. 10lbs of boost will always show up as the same voltage (and therefore "throttle opening" percentage), no matter where the throttle actually is.



-=Russ=-