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thanks Dean, few more questions for ya
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Posted by perkj [Email] (more from perkj) on Wed, 14 Jul 2004 09:01:44 Share Post by Email
In Reply to: T7 Engine Management details?, Dean, Wed, 14 Jul 2004 05:51:08
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Thanks Dean.....lots of good stuff there!! Just curious, is the T7 a derivative of/based off of a Bosch LH/turbo EFI system or is it purely a Saab home grown EFI?

>So also no huge power whan cold like the T5.
From this I assume you mean cold ait temps so a "cold air intake" system is pointless for a T7?

>The DI-ECU monitors the plasma resistance of the spark plug gaps and
> detects knocking conditions that way. So there are four knock sensors,
> the plugs.
So there a a seperate DI-ECU from the main ECU? Not sure I quite understand how the measure of resistance in the plugs can determine knock...any further insight here? My understanding of a more standard knock system (detection of vibrations in cyclanders) just isn't allowing me to understand the workings of the T7.


Do you know the flow rate of the stock injectors (Viggen specifically)?

Do you know what conditions put the T7 into safe/limp mode, besides the TB? I had a check-valve go bad with triggered the CEL and the car seemed to run normally (full boost, etc)

>The T7 DI does not have the life expectancy of the red T5 DI
Any insight into why the DI failures are so high (the $1 million dollar question, I know)? Anything beyond proper plugs, gaps, etc to prevent failure? Is Saab doing anything to address the issue? Recall on the horizon?

Do you know the normal timing of the ignition system....timing at idle, full advance, timing at full boost, etc?


Again thanks for the info...I'll post more questions as they come to me



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