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Need some apc boost advice please....
Posted by Smeter (more from Smeter) on Wed, 24 Mar 2004 13:50:45
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okay... here's the situation....
I have a 1992 Saab 900 turbo with a modified apc box from swedish dynamics. In 5th gear I am able to acheive full boost (i.e. the turbo needle stays pinned in the beginning of the red section). However, when bringing up the rpms in 3rd and 4th gear the turbo needle tends to fall away to about 75% of the yellow section. I guess in theory this could be due to back pressure in the exhaust system. But I don't think that is the case because I get full boost in 5th gear. Rather, I am left with the impression that this is apc related whereby the system is doing its job and retarding the ignition timing. So, where does this leave me? New exhaust? Or, should I do something as simple as get another spring thingie in the diaphram unit of the ignition distributor. And if I do need another spring in the diaphram, who the heck sells one?
I know.. I know... this post is a little long and requires some thinking. I am hopeful that someone out there has the energy to address this post. If you do, I thank you in advance.
posted by 64.228.37...
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