Quote:
Originally Posted by Nick06tC
For the supercharger unreliable. That is just a Scion tC thing. TRD has had MAJOR issues with the supercharger. I am on my second.
And I know 3 people personally who have gone through 3 EACH. All different shops installing them.
As far as how much boost for a tC. People have done up to 14PSI, without doing anyhting internally. but that isnt the norm. Usually 11-12 PSI is the limit. That is turbo tho.
Supercharged, it can handle more because it isnt a sudden boost, and its only at redline so the engine isnt stressed through the entire RPM range.
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in my experience, superchargers are more reliable than turbo set ups... thats why you used to see more OEM superchargers than OEM turbos, at least untill recently, there are ALOT of new cars out there that are turbo from the factory now.... ALOT
i partially agree with what you said about turbo seeing high boost throughout the RPM range, but depending on the setup the same can be done with a supercharger.... take my setup for example, i have a 2.7" pully that is capable of putting down 20psi at redline, but when i run it i usually limit boost to 17 psi via the bpv(cracked and melted the stock piston in cyl 4 @ 19psi
) , but i hit 17psi just over 4k rpm's, so i see 17psi for most of the power band. theoretically i could throw a smaller pully on there and still limit the boost to 17psi, and would see that 17psi throughout the RPM's, BUT that would greatly increase the amount of heat the blower would make from being spun out of its efficiancy range.
the thing thats nice about turbo's is they dont have any parasitic loss. belt drivin superchargers take power to make power... think about driving with the a/c compressor on, a supercharger has the same effect, and the faster you spin a blower the harder it is to spin and thus takes more power. if you had two cars that were identicle in every way, and you put a turbo on one and a supercharger on the other, and all factors were the same for both setups(cfm, boost, intake temps, etc), the turbo setup would make more power b/c it doesnt use up any power to make its boost. but generally a supercharger is more reliable b/c often, considering the whole set up, there are fewer parts to break or leak or whatever. and usually with a supercharger there is a much smoother power delivery, turbos can tend to be more punchy, esp if theres lag.