Intake system
03-02-2001, 08:19 PM
#11
Junior Member
Join Date: Mar 2000
Posts: 622
Likes: 0
Received 0 Likes
on
0 Posts
The way I'm reading the Bentley ...
Model Year 2000 engine code "ATW", has the coil driver built into the coil-pack.
But, 1999 and earlier engines with code "ABE" use N122 as the coil driver (I think Bentley has a typo here, cause my '99.5 engine code is AEB not ABE). Didn't see any sensors associated with N122, just seems to be a heatsink for the power transistors.
But, 1999 and earlier engines with code "ABE" use N122 as the coil driver (I think Bentley has a typo here, cause my '99.5 engine code is AEB not ABE). Didn't see any sensors associated with N122, just seems to be a heatsink for the power transistors.
03-02-2001, 10:19 PM
#16
Member
Join Date: Mar 2000
Posts: 3,348
Likes: 0
Received 0 Likes
on
0 Posts
Re: The Consortium says....
Where in Bentley does it say N122 alters ignition timing? I always thought the power stage is sort of like an ignition amplifier(people have used that term before on AW). Maybe it just converts the ignition signal from the ECU to a higher voltage and then the coil ups it a little more. I really don't think Audi would alter the timing of the ignition with some device inbetween the ECU and the coils, I mean everything should be taken care of in the ECU.
Why would they measure the unpressurized air temp in teh airbox to control timing? It really doesn't make any sense. Then what's the use of the Intake Air Temperature sensor G42 at the throttle body? I would think the air temperature through the throttle body after the turbo and intercooler is more important for determining ignition timing. After all this temperature is closer to what is actually entering the cylinders.
This is not an attack on your post, I'm not an EE nor English major(as you can see in my writing =P). I'm just raising some questions. AFAIK N122 is not a computer, honestly I don't know exactly what it does but I really don't think it does any kind of temperature measurement.
This is what I gathered from the Bentley. I could be wrong tho.
Why would they measure the unpressurized air temp in teh airbox to control timing? It really doesn't make any sense. Then what's the use of the Intake Air Temperature sensor G42 at the throttle body? I would think the air temperature through the throttle body after the turbo and intercooler is more important for determining ignition timing. After all this temperature is closer to what is actually entering the cylinders.
This is not an attack on your post, I'm not an EE nor English major(as you can see in my writing =P). I'm just raising some questions. AFAIK N122 is not a computer, honestly I don't know exactly what it does but I really don't think it does any kind of temperature measurement.
This is what I gathered from the Bentley. I could be wrong tho.
03-03-2001, 05:22 AM
#17
AudiWorld Super User
Join Date: Mar 2000
Posts: 3,359
Likes: 0
Received 0 Likes
on
0 Posts
Hoffman Audi is the one who told me this...
...and they blamed my modification of the air horn for the demise of this $315 part. They claimed that by shortening the airhorn and not subjecting the piece to the intake airstream, it is "affecting the ignition timing" while overheating. This piece apparently did something so vile to the #2 coil that it had to recently be replaced.
G42 definetely feeds back data to the ECM for processing. N122, on the other hand, has no power source other than the signals coming from the ECM. How can the module be amplifying the signal without an external power source. I view it as a signal modifier and not as an amplifier.
What would be interesting is to see is how the signal is modified by N122 with a change in temp. I may pull it this weekend (or Monday during the storm) to see.
Mike O.
G42 definetely feeds back data to the ECM for processing. N122, on the other hand, has no power source other than the signals coming from the ECM. How can the module be amplifying the signal without an external power source. I view it as a signal modifier and not as an amplifier.
What would be interesting is to see is how the signal is modified by N122 with a change in temp. I may pull it this weekend (or Monday during the storm) to see.
Mike O.
03-03-2001, 07:23 AM
#18
Uhmm, I think they may have fed you crap on that part :( It is primarily a heat sink..
The air sensor (for non turbo cars) is next to the MAF. For the turbo cars, there are two of them. This is true for many cars. The power module is located in a place goon enough to dissipate heat. Audi's are not unique