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Posted by Mr. Science (more from Mr. Science) on Wed, 18 Sep 2002 19:22:29 Share Post by Email
In Reply to: very definitive. . ., Tony Basile, Wed, 18 Sep 2002 17:18:42
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...where did you pick this up?

As I suspected in my response to Nathaniel, you can see that the Viggen 5spd limits torque in 1st and 2nd (technically in all gears, but the 3-4-5 limits are right at the stock max output, pretty much an electronic redundancy to the physical limit), whereas the other engines w/ 5spd only limit torque in 1st (no need elsewhere, though interesting that they didn't put the redundant electronic limit in 2-5 as they did on 3-5 in the Viggen...seems to me that makes your SE better suited to perf. upgrades w/o ECU reprogramming)

I see only a qualitative description here of the ability of the auto trans to limit torque, but you're right in that it clearly shows it's the engine computer doing it. What I still wonder though is whether this is something other cars' engine computers do as well. If so, why don't they publish it? If not, why does Saab's need/utilize a limit when others' don't (higher safety margin for auto trans components?)

Illustrated torque curve looks like it is a rough depiction (for illustrative purposes) of the 2.3L Viggen motor, but I assume it's not the exact torque curve mapped in the ECU (looks like it hits peak a little too soon and dies off a little too late).

Any idea where I could get my hands on the actual curves? Also I put a post on the perf. board earlier today looking for some other technical data... maybe you'd have a source?

Awesome stuff...thanks!

Cheers,

'Roo


posted by 128.42.17...

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