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Forced Induction All questions and problems regarding Superchargers, Turbos, NOS, ZEX, intercoolers, water injection, etc.

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Old 01-23-2007, 11:12 AM   #11
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Quote:
Originally Posted by BillBoost37
I fully agree Pat..

Having seen a nosedrive shaft connected to a rotor, the question of how the article mentions less rpm at the same wot..is a question. Unless WOT rpm was dropped
i gotta agree with the P Dad......there is a gearing change

reason is that Intense Recommends a 3.4 for Gen 3 and they Recommend a 3.6 for the Gen V, when starting to mod

becuse its similair to the M62 Gen 2 and Gen 3....they can spin the charger at a lower speed and have it make the same amount of boost....although the M62'* used different pullies, and different inlets to acheve this
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Old 01-23-2007, 11:25 AM   #12
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That'* the problem...where'* the gearing? Nosedrive is a solid shaft in bearings to my knowledge. The nosedrive shaft couples to one of the rotors and from there the rotor gears only time the two rotors to not clash.

Far as I know the only thing that controls how fast the rotors spin is the pulley and belt.

Edit...we could look at pics..but Pauls bandwidth exceeded and his PB is hosed.
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Old 01-23-2007, 11:31 AM   #13
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Quote:
Originally Posted by BillBoost37
That'* the problem...where'* the gearing? Nosedrive is a solid shaft in bearings to my knowledge. The nosedrive shaft couples to one of the rotors and from there the rotor gears only time the two rotors to not clash.

Far as I know the only thing that controls how fast the rotors spin is the pulley and belt.

Edit...we could look at pics..but Pauls bandwidth exceeded and his PB is hosed.
correct, and you are thinking exactly the same as me in the actuall working of the SC

could it be that there is a change in the way were the ND shaft couples, with the gears and then from there it has an effect on the speed that the rotors turn

do we have any pics of the ND or the rotor Gears of the Gen V from when Wren was playing with Pauls....from there we can compare it to the Gen 3??
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Old 01-23-2007, 11:35 AM   #14
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IIRC Paul only sent the case and not the rotors or ND.

I remember seeing it and they are the same as an M90. Guess I'll need to pick one up to check it out and find out where the "gearing" is located.
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Old 01-23-2007, 11:40 AM   #15
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Is the crank pulley the same?
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Old 01-23-2007, 12:33 PM   #16
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Guys, the V spins slower to produce the same boost because it'* more efficient. A gearing change isn't possible. The gear driven by the coupler spins at the same rate as the pulley. The other gear must be the same size to keep them synchronized.

Tolerances in the compressor casing are much tighter, the coating on the rotors is thicker to begin with so it 'breaks in' to this tight housing, and the inlet is a total redesign to flow better.

The outlet is also redesigned, and the rotor casing is longer.
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Old 01-23-2007, 01:46 PM   #17
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Fully agree Bill.. however when taken out of context..

" At wide open throttle, the Gen V turns at 700 fewer
rpm "

It sounds like a pulley size difference, if wot is considered the same on both.
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Old 01-23-2007, 02:21 PM   #18
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ok ive been thinking about this one

lets say (numbers are only a example, and not ment to be an exact calculation)

for the GEN 3

pulley and ND shaft spins at 1000 RPMS
rotors spin at 700 RPMS

GEN V

pulley and ND shaft spins at 1000 RPMS
rotors spin at 500 RPMS

this could be achieved by both gears and are attached to the rotors being physically larger in diameter than the Gen 3 Gears...this in effect would spin the rotors themselves slower
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Old 01-23-2007, 02:25 PM   #19
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The pulley is directly connected w/o gearing to the rotor. Whatever speed the pulley/nosedrive shaft spin is the same rpm that the rotors will spin. The only gears are to keep the rotors from hitting lobes. They have no rpm changing ability.
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Old 01-23-2007, 02:29 PM   #20
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Quote:
Originally Posted by BillBoost37
The pulley is directly connected w/o gearing to the rotor. Whatever speed the pulley/nosedrive shaft spin is the same rpm that the rotors will spin. The only gears are to keep the rotors from hitting lobes. They have no rpm changing ability.
yes bill im aware of that
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