dme/afm question
08-28-2003, 11:01 AM
#16
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i want an easily chippable DME in my car. switching between the cars accomplishes this. anyone want to trade an early dme and afm for a late one?
-Michael-
-Michael-
08-28-2003, 02:50 PM
#17
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Chip the early DME. FRWilks has the solder on board and selector switch for this.
When I say NOT COMPATABE I mean unless you do some serious parts swapping.
As to swapping between early and late modes: The AFS (NOT meter -- sensor) and the idle control valves are definately different. The AFS in the resistance cuve and the idle control valve in that the early is a timed heated bi-metalic spring off of the fuel pump circuit and the later is controlled by the DME.
I can see putting a later model DME into an early car for testing. As the AFS reports airflow differently the car will not perform as well as with the correct DME. Replacing the older AFS with the later AFS to get the right feedback on airflow. Since the idle control valve is seperate from the DME you should have proper cold start idle.
Putting an early DME into a later 944 is mostly the opposite. Changing the AFS and the idle bypass/control valve to the early one and itersecting a 12 volt keyed power wire for activating the valve.
If your idle is crappy or fluxuates and/or poor performance you have hit the wall on compatability.
When I say NOT COMPATABE I mean unless you do some serious parts swapping.
As to swapping between early and late modes: The AFS (NOT meter -- sensor) and the idle control valves are definately different. The AFS in the resistance cuve and the idle control valve in that the early is a timed heated bi-metalic spring off of the fuel pump circuit and the later is controlled by the DME.
I can see putting a later model DME into an early car for testing. As the AFS reports airflow differently the car will not perform as well as with the correct DME. Replacing the older AFS with the later AFS to get the right feedback on airflow. Since the idle control valve is seperate from the DME you should have proper cold start idle.
Putting an early DME into a later 944 is mostly the opposite. Changing the AFS and the idle bypass/control valve to the early one and itersecting a 12 volt keyed power wire for activating the valve.
If your idle is crappy or fluxuates and/or poor performance you have hit the wall on compatability.
08-28-2003, 03:21 PM
#18
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yeah, i'd do that but i'm not about spending $400 for something that wont help THAT much.. i will however buy a welt. chip for $100 and mess with things this way. guess i'll search ebay for a late dme and afm setup.
-Michael- anyone got a late dme/afm to sell me?
-Michael- anyone got a late dme/afm to sell me?
