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Originally posted by HB.
Both, the NSX and Boxster are virtually running the same compression ratio. Heatsoak would also be a good factor for any related failures. Both cars have very tight engine compartments, so I'm just wondering why it works for the NSX and not the Boxster? Better engine maybe???
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I don't think it has to do with the NSX having a better engine. Like I said, running a relatively low amount of boost should most likely not yield any issues.
Keep in mind that Comptech is a very reputable company. Since I'm familiar with BMW, I'll give you an example of what I'm trying to say. Dinan has been known to produce a very reliable system for the E36 M3. A lot of competitors produce essentially the same system with the same Vortech blower. However, the difference is in engine management and boost. I've seen people have
major issues with these other company's systems and not with the Dinan. Granted, there are also success stories with these other companies. The difference is that you never hear of any issues with Dinan. It's not rocket science. It's just whether the package as a whole is designed well. Know what I mean?
When you hear about engines grenading, there's only a few reasons that could make that happen. Run low enough boost, have proper fuel delivery and proper engine management and you should have no problems.
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There are plenty of 996 onwers who are running centrifugal superchargers, and have had no problems thus far. Does the 996 use different engine internals then the 986? If you can run a centrifugal blower that spins almost twice as fast as a PD blower and not have problems, why can't these motors handle less boost, less CFM?
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Centrifugal works totally different than a twin-screw. You get hardly zero boost below 4K rpms. Max boost occurs at redline. And if all you're getting at redline is a low 6psi or something, then that's actually less stress than a PD's constant boost. How fast they spin vs a PD is irrelevent.
So you're saying there are 996 motors running over 9psi of boost on bone-stock internals running high compression? I'm skeptical.
I know you want real life stories and not theory. But since supercharging a Boxster is not that popular at the moment, all we have are theories.