4.6L 3v bottom end strength with supercharger?
#21
dk, where are you getting your info? I've not seen different numbers on how much the bottom end will tolerate with different kinds of FI. I am curious to know why the bottom end might be less tolerant of a TVS than a twin screw.
As far as the E-Force not being efficient, at 5psi it makes as much power below ~5300 rpm as a whipple with 10psi.
JDM and DynoJoe might disagree with you on E-Force's potential. Their cars are about to dip into the 9's.
As far as the E-Force not being efficient, at 5psi it makes as much power below ~5300 rpm as a whipple with 10psi.
JDM and DynoJoe might disagree with you on E-Force's potential. Their cars are about to dip into the 9's.
#22
dk, where are you getting your info? I've not seen different numbers on how much the bottom end will tolerate with different kinds of FI. I am curious to know why the bottom end might be less tolerant of a TVS than a twin screw.
As far as the E-Force not being efficient, at 5psi it makes as much power below ~5300 rpm as a whipple with 10psi.
JDM and DynoJoe might disagree with you on E-Force's potential. Their cars are about to dip into the 9's.
As far as the E-Force not being efficient, at 5psi it makes as much power below ~5300 rpm as a whipple with 10psi.
JDM and DynoJoe might disagree with you on E-Force's potential. Their cars are about to dip into the 9's.
The E-Force is a roots style with the newer, more efficient generation 6 rotors. They have a twist like the twin screw, but still pump air rather than compress it, so they are very different designs. The twist in the rotors makes them quieter and more efficient. Being a roots style, they are still not quite as efficient, but between the rotor design, the longer runners, the bigger throttle body, and some other small design characteristics, they are quite efficient. HOWEVER, the rated "5 psi" marketing hype is 466 BHP, or about 400-410 RWHP, and being roots, at 6300 rpm you are at almost 7.5 psi of boost. A Whipple at 10psi with a stock TB and no other changes will get around 480 RHWP at sea level. So tell me which one is more efficient?
Now do some math - One PSI boost on a 4.6 will get you ~16 rwhp. A Whipple takes about 35 hp to spin at 6300 rpm, so all things being equal, if you took away 2.5 psi from the whipple example, you still see the E-force as taking about 40 more hp to run at that RPM. The older straight rotor roots superchargers can take upwards of 80-90 hp to spin at 6k rpm. The rods and crank are pushed harder to get the same power at the flywheel than any other type of FI.
JDM has a 600+ RWHP mustang with the E-Force, but it is a stroked and built motor with cams and heads, and the supercharger has a small pulley and a custom tune. I don't know what they are running for boost, but I guarantee it is more than 12 psi at over 6k rpm (you need about 13-15 psi to make that kind of power, even on a stroked and built motor). With a turbo at the same max boost, they would see 40-60 more hp at the wheels.
#23
he is right, there are alot of factors. I am running 10 psi paxton supercharger, with charge motion delete plates and NSR Blower Cam, Ted Jannetty Custom tune = 519 rwhp I have gone 20k miles so far, its my DAILY DRIVER....not even a sputter, glitch free, runs like a top. Crazy power............ So many people on this forum have told me that they hope I am saving up to rebuilt my motor...I don't see it happening, sorry guys
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