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Old Nov 6, 2015 | 06:14 PM
  #41  
03sierraslt's Avatar
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Originally Posted by Atomic
On whipple's site they have different "2.3s", the 140R is 1389 but the 140AX is 1430cfm. If you want to be picky you need to know what speed that is at, if its at max speed (18000rpm) then it moves about the same as the eaton rotor set.

Who is saying they loose boost with RPM? That is consistent with belt slip or a super donkey dick cam (engine VE peaks while blower VE is falling). To gain boost with RPM usually means the cam is dying out pretty fast (barring all other possibilities like valve springs or exhaust pressure) before the blower does.
So your saying my 224/236 cam is dying out because I build boost with rpm meanwhile I have zero back pressure and valv springs rated well above my cam specs?
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Old Nov 6, 2015 | 07:07 PM
  #42  
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I have a gauge for that
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Yep! Boost is basically the difference in volumetric flow between what the blower puts out and what the engine takes in. If boost increases it doesnt mean you dont keep making more power, just that you are falling past peak torque.
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Old Nov 7, 2015 | 12:20 PM
  #43  
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No I don't think so.

Look at the VE of the r2300. With RPM it gets to 100. It will surpass the engine even if the engine hasn't signed off yet.
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Old Nov 7, 2015 | 03:24 PM
  #44  
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I have a gauge for that
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Yea...thats what I said....blower VE is high and engine VE is low, so you get boost rising with RPM.
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