Author | Topic |

Location: Kita-Ku, Sapporo, Japan
Registered: January 2003
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Re: SUPERCHARGERS VS TURBOS
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Thu, 10 March 2005 07:55

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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...
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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...
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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...
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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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| Subject | Poster | Date |
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SUPERCHARGERS VS TURBOS
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supa_rolla | Thu, 10 March 2005 04:49 |
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Re: SUPERCHARGERS VS TURBOS
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TurboRA28 | Thu, 10 March 2005 04:53 |
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Re: SUPERCHARGERS VS TURBOS
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tim123c | Thu, 10 March 2005 05:07 |
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Re: SUPERCHARGERS VS TURBOS
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Kyosho | Thu, 10 March 2005 05:21 |
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Re: SUPERCHARGERS VS TURBOS
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oldcorollas | Thu, 10 March 2005 07:08 |
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Re: SUPERCHARGERS VS TURBOS
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Kyosho | Thu, 10 March 2005 07:44 |
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Re: SUPERCHARGERS VS TURBOS
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boxh34d | Thu, 10 March 2005 07:53 |
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Re: SUPERCHARGERS VS TURBOS
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oldcorollas | Thu, 10 March 2005 07:57 |
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Re: SUPERCHARGERS VS TURBOS
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IRA11Y | Thu, 10 March 2005 08:30 |
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Re: SUPERCHARGERS VS TURBOS
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oldcorollas | Thu, 10 March 2005 07:55 |
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Re: SUPERCHARGERS VS TURBOS
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river | Thu, 10 March 2005 05:24 |
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Re: SUPERCHARGERS VS TURBOS
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4agte | Thu, 10 March 2005 06:49 |
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Re: SUPERCHARGERS VS TURBOS
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Henn | Thu, 10 March 2005 12:12 |
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Re: SUPERCHARGERS VS TURBOS
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oldcorollas | Fri, 11 March 2005 00:05 |
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Re: SUPERCHARGERS VS TURBOS
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supa_rolla | Thu, 10 March 2005 23:45 |
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Re: SUPERCHARGERS VS TURBOS
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THE WITZL | Fri, 11 March 2005 00:34 |
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Re: SUPERCHARGERS VS TURBOS
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Ben Wilson | Fri, 11 March 2005 01:53 |
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Re: SUPERCHARGERS VS TURBOS
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M.W.P. | Fri, 11 March 2005 08:40 |
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Re: SUPERCHARGERS VS TURBOS
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mick | Fri, 11 March 2005 09:59 |
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Re: SUPERCHARGERS VS TURBOS
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river | Fri, 11 March 2005 10:10 |
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Re: SUPERCHARGERS VS TURBOS
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Corona RT142 | Fri, 11 March 2005 11:04 |
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Re: SUPERCHARGERS VS TURBOS
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towe_001 | Fri, 11 March 2005 12:11 |
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Re: SUPERCHARGERS VS TURBOS
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boxh34d | Fri, 11 March 2005 13:28 |
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Re: SUPERCHARGERS VS TURBOS
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towe_001 | Fri, 11 March 2005 14:04 |
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Re: SUPERCHARGERS VS TURBOS
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joorsh | Fri, 11 March 2005 14:34 |
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Re: SUPERCHARGERS VS TURBOS
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joeninety | Fri, 11 March 2005 22:09 |
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Re: SUPERCHARGERS VS TURBOS
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M.W.P. | Sat, 12 March 2005 03:37 |
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Re: SUPERCHARGERS VS TURBOS
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fatmr2 | Sat, 12 March 2005 01:30 |
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Re: SUPERCHARGERS VS TURBOS
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Joshstix | Sat, 12 March 2005 03:56 |
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Re: SUPERCHARGERS VS TURBOS
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Norbie | Sat, 12 March 2005 07:13 |
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Re: SUPERCHARGERS VS TURBOS
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towe_001 | Sat, 12 March 2005 09:18 |
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Re: SUPERCHARGERS VS TURBOS
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IRA11Y | Sat, 12 March 2005 09:32 |
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Re: SUPERCHARGERS VS TURBOS
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THE WITZL | Sat, 12 March 2005 09:13 |
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Re: SUPERCHARGERS VS TURBOS
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Norbie | Sat, 12 March 2005 09:45 |
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Re: SUPERCHARGERS VS TURBOS
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IRA11Y | Sat, 12 March 2005 10:04 |
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Re: SUPERCHARGERS VS TURBOS
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brett_celicacoupe | Sat, 12 March 2005 10:03 |
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Re: SUPERCHARGERS VS TURBOS
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thu187 | Sat, 12 March 2005 16:26 |
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Re: SUPERCHARGERS VS TURBOS
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IRA11Y | Sat, 12 March 2005 18:23 |
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Re: SUPERCHARGERS VS TURBOS
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Kyosho | Sun, 13 March 2005 07:43 |
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Re: SUPERCHARGERS VS TURBOS
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YelloRolla | Tue, 15 March 2005 13:29 |
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Re: SUPERCHARGERS VS TURBOS
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JustenGT4 | Wed, 16 March 2005 02:24 |
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Re: SUPERCHARGERS VS TURBOS
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Chris Davey | Sun, 13 March 2005 01:51 |
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Re: SUPERCHARGERS VS TURBOS
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pro_ke | Sun, 13 March 2005 02:20 |
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Re: SUPERCHARGERS VS TURBOS
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Mookie | Wed, 16 March 2005 23:13 |
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Re: SUPERCHARGERS VS TURBOS
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THE WITZL | Sun, 13 March 2005 08:28 |
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Re: SUPERCHARGERS VS TURBOS
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thu187 | Sun, 13 March 2005 14:11 |
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Re: SUPERCHARGERS VS TURBOS
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TRD-ST162 | Sun, 13 March 2005 23:14 |
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Re: SUPERCHARGERS VS TURBOS...more things to consider!!!
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supa_rolla | Sun, 13 March 2005 23:47 |
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Re: SUPERCHARGERS VS TURBOS
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supa_rolla | Mon, 14 March 2005 10:40 |
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Re: SUPERCHARGERS VS TURBOS
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YelloRolla | Wed, 16 March 2005 02:32 |
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Re: SUPERCHARGERS VS TURBOS
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jamem | Wed, 16 March 2005 02:45 |
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Re: SUPERCHARGERS VS TURBOS
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Corona RT142 | Wed, 16 March 2005 02:46 |
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Re: SUPERCHARGERS VS TURBOS
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jamem | Wed, 16 March 2005 10:28 |
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Re: SUPERCHARGERS VS TURBOS
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GUN METAL 87 SC | Wed, 16 March 2005 07:10 |
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Re: SUPERCHARGERS VS TURBOS
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takai | Wed, 16 March 2005 07:41 |
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Re: SUPERCHARGERS VS TURBOS
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Joshstix | Thu, 17 March 2005 06:59 |
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Re: SUPERCHARGERS VS TURBOS
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Norbie | Thu, 17 March 2005 09:59 |
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Re: SUPERCHARGERS VS TURBOS
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IRA11Y | Thu, 17 March 2005 10:03 |
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Re: SUPERCHARGERS VS TURBOS
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takai | Thu, 17 March 2005 10:06 |
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