Quote:
Originally Posted by SubieNate
You think they're going to risk telling owners what the engine can take with FI solely on lab tests? Don't be silly.
That said, it would be extremely complicated to model all the forces put onto every component in the engine under real conditions in a laboratory test. There are so many different thermal and mechanical loading conditions happening so quickly in the engine that predicting and isolating the worst case scenario for each and every component and then coming up with a test setup to replicate those conditions would be extremely difficult.
Definitely not worth it to Toyota or Subaru since as has been stated over and over again, there will be no factory forced induction. And it's very easy for them to put the TRD supercharger on a few test cars to determine whether it's going to impact long term reliability at 5 psi or whatever low number they'll use. Much, much easier than lab tests.
(I'm not just being a downer here, I worked as a structural test engineer for a while. Things get uber complicated when you're talking about an assembly as complicated as an IC engine with as much going on thermally as an IC engine on top of the mechanical stress)
Nathan
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That's what they do for a living! They are PhD engineers designing this thing and their companies reputation relies on them developing a safe, powerful and reliable product on paper first before they will consider spending millions on tooling to start the pre-production test engines. So to say that modeling it using forced induction or not, is not a likely scenario than I think you're mistaken. Granted not all conditions can be thought of in the design stage, but in my mind I would think that they would pick the worst of worst scenarios and go from there. I.e) desert temps, to Arctic temps, to plugged filter, WOT with cold oil and go from there. The forces is the easy part, the hard part would the air flow through the engine to maximize fuel economy, power, reliability, drive-ability, etc. Fuel emission requirements are getting tougher and tougher, so to make 100 hp/l is amazing, granted its no 240 like the s2000 but the s2000 had less requirements to meet when it was brought out.