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oldcorollas
Forums Junkie


Location:
Kita-Ku, Sapporo, Japan
Registered:
January 2003
 
Re: SUPERCHARGERS VS TURBOS Thu, 10 March 2005 07:55 Go to previous messageGo to previous message
Kyosho wrote on Thu, 10 March 2005 18:44


Full Boost is NOT instant...

The Super charger has to spin up linear to the RPM of the engine...
At LOW rpm, Full throttle, the engine is wanting more air then what the SC is suppling compared to at Full throttle on high RPM...



crap.
a supercharger is driven at an EXACT RATIO compared to crank speed. at WOT, the SC provides a DEFINED amount of air. the SC doesn't need to spin up.

EXAMPLE:
a 2L motor will consume (at 100% VE) 1L of air PER REVOLUTION.
if you have sayyy an SC12 (1.2L) running at 1:1 with crank speed, it WILL PROVIDE 1.2L of air per revolution. this DOES NOT CHANGE WITH RPM (except for inefficiencies)
an engine is an air pump, and an SC is an air pump. they are coupled mechanically.
this is why SC'd cars can have 80% of max torque just off idle.


Kyosho wrote on Thu, 10 March 2005 18:44


Boost still has to build up, but builds up more linearly then what a Turbo does...



NO NO NO.. boosty IS LINEAR. it doesn't build up. the ratio is mechanical and the air provided, and thus boost, is the result of a mechanical ratio. at high rpm (depending on cams) the VE of the motor decreases, as does the VE of the SC, as well as the power required to drive the SC increasing due to friction, as well as extra heat generated by the positive displacement style of air induction.



Kyosho wrote on Thu, 10 March 2005 18:44


As for the bleed valve, there are systems available (No bull shit) that you can over drive your Super charger more then normal, to make boost earlier, yet as it hits a specific boost, the valve opens, and starts to leak air out (just after the SC, so problems of dumping fuel are a non issue)
The problem there becomes, if you BLOCK the valve, Boost will build up heaps... IF the supercharger can hold togethor with the centrifugal forces acting on it...
SuperChargers are only able to go to a maximum RPM...


sigh.. so there are valves that change the drive ratio of the SC?
what you are talking about (but don't know it) is effectively a wastegate for an SC. the problem is that boost is not rpm related. boost is ratio related. to double boost you double the drive ratio. yes this does limit the engine rpm, but ONLY because of things like compression efficiency of the SC and (in toyotas case) the melting of the lobe coatings.

LOL, SC lobes can withstand a lot of centripital acceleration. ever heard of lobes breaking up?

SC's have a recommended rpm range which is due to their efficiency, same as for turbos. exceed that rpm and you drop the efficiency to a level that is unacceptable...


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Read Message   SUPERCHARGERS VS TURBOS supa_rollaThu, 10 March 2005 04:49
Read Message   Re: SUPERCHARGERS VS TURBOS TurboRA28Thu, 10 March 2005 04:53
Read Message   Re: SUPERCHARGERS VS TURBOS tim123cThu, 10 March 2005 05:07
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Read Message   Re: SUPERCHARGERS VS TURBOS oldcorollasThu, 10 March 2005 07:08
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