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Standard thing - high NOx readings. Those restrictions are very tight on cars in California these days, and Saabs have no way to deal with it. EGR handles the duty on most cars, but a Saab relies only on the catalytic converter.
Lowering the compression ratio seems to have positive effect on NOx emissions - I assume by lowering in-cylinder temperatures. I'm not sure about that scientifically, but it certainly seems to be the case anecdotally. Switching to a 2.1l head on my 1992 900Tc and my 1990 SPG had a pretty dramatic effect on each of their NOx output, so I'm following the formula on the 1980 as well... Those cars the head was part of the performance package, but if it will help the 5-door fly through the way they did, I'm all about that... :)
posted by 216.57.64...
Posts in this Thread:
- Valve Guide Replacement, Justin VanAbrahams
, Fri, 8 Dec 2006 15:39:21- smog failure details?, MS, Fri, 8 Dec 2006 19:06:12
- In general..., Justin VanAbrahams
, Fri, 8 Dec 2006 17:52:02 - Re: Valve Guide Replacement, chrisx, Fri, 8 Dec 2006 17:39:39
- Re: Valve Guide Replacement-Surprising, Roger D
, Fri, 8 Dec 2006 17:34:24 - Re: Valve Guide Replacement, SWEDISH DYNAMICS, Fri, 8 Dec 2006 17:20:06
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