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Re: All true Posted by Dave The Ice Age Knave [Email] (#2068) [Profile/Gallery] (more from Dave The Ice Age Knave) on Thu, 13 Aug 2020 20:16:55 In Reply to: All true, bobc [Profile/Gallery] , Thu, 13 Aug 2020 06:55:46 Members do not see ads below this line. - Help Keep This Site Online - Signup |
I just love the ideas put into play for the 9-5. Your team of flight technicians might enjoy the following rough notes from the Saab 9-5 Tunberg book:
>The 9-5 needed to have better fuel economy than predecessors. On the emissions side things were going really well in 1993 with Trionic, Bosch, engine design etc so the newer focus was fuel economy.
>Decreasing inner friction would increase fuel economy by 5% but turbo decrease by 2%.
>Turbo would increase torque allowing for higher gearing for fuel economy.
>In the end, fuel economy improved by 7%
>they had 25 ideas for better fuel economy. They prioritized on best return at lowest price
>Lowering internal friction was a priority - they developed the worlds thinnest valve shaft using a new alloy allowing for lighter but weaker springs. To offset weakness, they added an extra spring.
> focus then on lower weight for connecting rods,bushings, crankshaft, balance shafts and flywheel.
>New shorter pistons reduced amount of coolant required which shortened warmup time and lowered emissions.
>New (somewhat short-lived as we know) electronic throttle kept the driver from accelerating/decelerating so hard that it increased emissions.(Arcs especially tend to be a little lame off the line to reduce wheel spin and control emissions from over-enthusiast drivers). In other words, drive by the wire TB's allowed Saab to prevent the driver from doing "bad" things like wasting fuel and prevent the engine from doing bad things like polluting the air.
>(As some know the 9-5 engines are not considered as robust for tuning as it's predecessor engines.
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