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Old 03-12-2006, 11:01 PM   #21
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Technically yes the other sensor do adjust for timing advance, but in reality it is still keeping yur timing advance.

It is not something you want to run al the time, if you do it your just defeating the purpose. And your advance depends on what size resistor you put in , IIRC you can go up 4* with a 10k ohm. But 4* puts you in piston popping range.
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Old 03-12-2006, 11:06 PM   #22
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Piston popping range from timing advance? Maybe I'm misunderstanding.

Popping pistons is a pre-ignition/detonation/KR thing related to boost level, temp, and octane.

Doing the IAT trick won't prevent the knock sensors from working.
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Old 03-13-2006, 12:22 AM   #23
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It'* a 4.2 K ohm 1/2 watt resistor that is supposed to gain 2* timing.


Quote:
It is not something you want to run al the time, if you do it your just defeating the purpose. And your advance depends on what size resistor you put in , IIRC you can go up 4* with a 10k ohm. But 4* puts you in piston popping range.
I don't understand what you are saying. How will it defeat the purpose, if the air mass is cooled before it is burned. Can you explain.
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Old 03-13-2006, 11:07 PM   #24
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Timing does not advance based on cooler temps. Timing is retarded based on too hot of temps (at least in my 00 code). The only timing advance worth monitoring (in terms of these tests) is at WOT.
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Old 03-13-2006, 11:26 PM   #25
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Yes I know that Rogue. The idea is to prevent knock or temp induced timing retard....effectively advancing it by as much as it would have been retarded at higher boost, higher temps, etc
What else does the IAT control besides A/F and timing
I don't see that the engine knows what the temp of the charge is after the supercharger. It must interpolate it using other variables like IAT, MAP, MAF, O2, rpm, etc.......but if the IAT was fooled....
So if you were intercooling, how would it know how much cooling after the IAT sensor?
If you were cooling effectively but the IAT is detecting 100F readings, won't it retard the engine.

Hey, I admit I don't know squat about the programming of our PCM'* but I'm really curious to understand.
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Old 03-13-2006, 11:59 PM   #26
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Don had a 4 degree timing advance with the sensor disconnected, and repeated it a couple times. Disconnected, the IAT (in the PCM) defaulted to 60 compared to the actual 80 ambient.
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Old 03-14-2006, 02:54 AM   #27
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I rest my case.
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Old 03-14-2006, 07:48 AM   #28
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Quote:
Originally Posted by willwren
Don had a 4 degree timing advance with the sensor disconnected, and repeated it a couple times. Disconnected, the IAT (in the PCM) defaulted to 60 compared to the actual 80 ambient.
Was this checked at WOT or cruise?
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Old 03-14-2006, 07:49 AM   #29
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Quote:
Originally Posted by 2000SilverBullet
If you were cooling effectively but the IAT is detecting 100F readings, won't it retard the engine.
It is my understanding that yes this would happen, but I don't remember at what temp timing is pulled and if I remember right it was a max of 1 degree at some really high heat.
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Old 03-14-2006, 07:50 AM   #30
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The real solution to this is to add manual timing controls and select your timing advance.

I will get a copy of the IAT tables and post him here.
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