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Re: Boost levels on '96 Aero manual Posted by Karl [Email]  (#161) [Profile/Gallery]
(more from Karl) on Sat, 8 Dec 2001 17:56:58
In Reply to: Re: Boost levels on '96 Aero manual, BillJ, Sat, 8 Dec 2001 11:45:45 Members do not see ads below this line. - Help Keep This Site Online - Signup |
Hi Bill,
To try to answer your questions:
1. There was no "overboost" function or anything like it introduced in 1996. I know for a fact that the Aero software was unchanged from 1994 to 1997 (even 1998 if we include the "Classic" as it was called here). What I guess you're referring to is the momentary boost surge that you may get when you apply the throttle briskly. That has more to do with the fact that in the software boost levels can be "programmed" in two different ways. For instance, the program could (at a certain rpm, gear and throttle position) have "1,0" bar or "1,0 bar+", depending on whether the software is supposed to stabilize boost or continue to increase boost beyond that point. I guess that's what you're experiencing.
2. Heat plates is an interesting "phenomenon" that Saab introduced in 1996 as a measure to reduce emissions at cold start. It's an electrically heated "plate" that has "tentacles" that sit in the intake channels and heat the intake air. Naturally they seriously reduce airflow through the intake and, for performance reasons, should be removed.
Determing if you have heat plates can be done in any of the following ways:
1. Standing in front of the engine bay, check the fuse box on the right. If it has any referral to "HEAT PLATE", well you have heat plates...
2. Check between the engine block and the intake. The heat plate is like a 7-8 mm gasket with an electrical wire attached on the driver's side.
3. Check your boost @ 5500 rpm. If it's 0,82 bar you have heat plates, if it's 0,69 bar then your car doesn't have 'em...
Removal is easy. Remove intake. Unscrewing the bolts is a bit of a pain as access is limited, but it's no worse than many other things we willingly undertake... Just buy a new gasket from Saab and remember to untap some of the coolant as this can risk get into the engine otherwise... I took the opportunity to change coolant while I was at it. It REALLY improves performance, especially in my car which has an upgraded ECU.
/ Karl
posted by 193.150.1...
, Sat, 8 Dec 2001 11:11:56, Sat, 8 Dec 2001 17:56:58 <-- Viewing This Message, Sat, 8 Dec 2001 20:32:42, Sat, 8 Dec 2001 11:17:36
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