Is there a way to log N249 duty cycle?
07-07-2008, 05:34 PM
#1
AudiWorld Super User
Thread Starter
Is there a way to log N249 duty cycle?
Still getting some hesitation as boost builds. On gas pretty hard, not WOT, and at about 10psi it cuts out and stutters a bit and I can hear what sounds like the DV cycling. I already replaced the N75 and that seemed to fix things a bit (no longer surging to 30psi). I'm wondering if the N249 is on its way out or perhaps some other sensor is and the ECU gets confused and tries to dump boost. Also, this seems to be heat related. It's much worse on a hot day so I'm thinking a sensor or something electrical and not a leak somewhere. Thanks!
07-07-2008, 05:41 PM
#2
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John: Yes, I believe it can be logged.
When I had problems with my new turbo setup, we looked closely at the wastegate duty cycle, which of course is determined by the N75. Unfortunately, I don't recall which blocks you need to look at.
07-07-2008, 05:56 PM
#3
Do the log suite..(update)...>>
002, 118, 204
2K then WOT to redline in 3rd gear
Email me the file!
(N75 is in the 118 block. No Log for N249 that I know of...It takes its commands to dump boost from the ECU which is a slave to the sensors......all of them)
<img src="http://images19.fotki.com/v22/photos/7/7305/776256/Sensordiagram-vi.jpg">
2K then WOT to redline in 3rd gear
Email me the file!
(N75 is in the 118 block. No Log for N249 that I know of...It takes its commands to dump boost from the ECU which is a slave to the sensors......all of them)
<img src="http://images19.fotki.com/v22/photos/7/7305/776256/Sensordiagram-vi.jpg">
07-07-2008, 06:45 PM
#6
AudiWorld Super User
Thread Starter
I thought about that but was a bit worried that it might be the ECU pulling boost
for some other (good) reason. Didn't want to possibly put a hole in the block by disabling a failsafe mechanism. I think before I pull it completely I'll swap with the spare sitting in the blue car 
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