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Old 08 Sep 2008, 11:46 am
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Join Date: Aug 2007
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Default few questions about superchargers and turbos?

ok.. now keep in mind money is hardly an option.. i get everything dirt cheap because of job.. ok... i drive a it possible to put both a supercharger and tubro in there... supercharger to work off low rpm's and turbo to work off high rpms?... also can you put a twin turbo in an rsx-s??
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Old 08 Sep 2008, 12:01 pm
Join Date: May 2008
Posts: 92

With the right set up the turbo charger is redundant. I have seen cars with both, but why?Either a supercharger or a turbo charger can boost the intake air pressure enough to float the valves by themselves when the set up is wrong. It would seem that with both the problem would be more pronounced.In short, great for show and a trailer queen but it would be not much for the road or track.The more moving parts the more likely it is to break.
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Old 08 Sep 2008, 12:31 pm
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Join Date: Aug 2007
Posts: 891

you really only need one, a turbo or the supercharger although i have seen both done. i suppose that you could twin turbo your Type-S, but i havent seen one done to that car yet. i would recommend to just get a turbo. you dont need loads of extra power at lower rpms. floating valves realy only happen at very high RPM( that you wont get to), either way do a compression test before you start to make sure that everything is okay, also if you plan on keeping the motor with stock internals dont plan on turnig up the boost very high without breaking things. just a few links... i know you dont have a B18 but the info is still usefull "dirt cheap" i hope they are good quaility parts
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Old 08 Sep 2008, 01:01 pm
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Anything is possible, with enough $ & saavy. The question is 'why do it'? WW2 saw compound turbosupercharged aircraft engines that delivered incredible amounts of boost...enabled high altitude flight in rarified air from internal combustion engines.Automotive applications don't warrant compound forced induction systems, they would be a step backwards. Various vehicles operate under high levels of boost, but almost always using a single technology...mostly turbocharging for street & track applications, and superchargers at lower boost for street, and high boost for the custom class of drag strip racers (i.e., top fuel, funny cars, etc.).Twin turbos are not employed so much to provide added boost over single turbo designs, but rather to reduce the inherent problem of 'turbo lag' associated when a turbocharger 'spools up'. Twin turbo setups typically employ smaller turbines, having less mass/inertia, that reduces the problems from turbo lag. The issues & considerations for using high boost boost levels for street applications are numerous. For example, there are design limitations with various engine blocks used on many street machines. Many Honda motors for example (as good as they are), are of an 'open deck' design that limits the amount of boost possible w/o some serious redesigns that some racers end up employing. Note that dragsters use custom milled, billet aluminum to get the very strongest block possible...anything less would be disasterous when running high boost.Also, using very high levels of boost is counterproductive with many of today's high compression engines. Many normally-aspirated engines already operating on 91/93 gas, run close to 'detonation' (i.e., pre-ignition before tdc), that only would be exacerbated if lots of added boost was employed. Most new cars now equipped with engine 'knock' sensors will in conjunction with the engine control module retard the timing to prevent knock. So in order to take advantage of high boost, you'd have to reduce the compression, and/or employ higher octane racing fuels, plus use a custom tunable, aftermarket engine control management system, plus trial & error in experimental tuning to achieve optimum results...hopefully w/o damaging the motor (blown gaskets, bent rods, etc.). In the end, the car literally becomes a weekend track car, undrivable for daily street applications.
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