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Unread 10-16-2010, 07:36 PM   #11
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I down pulleyed down and switched to e85 netting almost 100hp and like 80+ tq.
Number 1 Reason to go E85 = 91 octane is almost 3 Bucks a gallon here, E85 roughly 110 Octane is 2.09

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Unread 10-16-2010, 07:56 PM   #12
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Originally Posted by Nategr8ns View Post
If you ask me, he probably means a supercharger pulley to increase the pressure.
Nope, that would an overdrive pulley. Kenny was talking about an underdrive pulley:

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yeah you can get that with a pulley a few tenths of an inch smaller too,
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Unread 10-16-2010, 10:06 PM   #13
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this is a convo which it would really help to have a clue about turbos/supercharger.
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Unread 10-16-2010, 11:31 PM   #14
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this is a convo which it would really help to have a clue about turbos/supercharger.
If you have a supercharger you want to switch to a bigger crankshaft pulley to spin the supercharger belt faster. If you are naturally aspirated, you want an underdrive pulley to reduce the parasitic power loss.
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Unread 10-17-2010, 12:01 AM   #15
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I figured that much out.
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Unread 10-17-2010, 12:11 AM   #16
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I figured that much out.
Thats about the extent of my knowledge...

I know that Kenny is dead wrong about underdrive pulleys bringing 30HP...

I wish.
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Unread 10-17-2010, 12:13 PM   #17
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Did they ever fix that issue where it screws up cats? (ethanol)

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Unread 10-17-2010, 06:40 PM   #18
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E85 has a higher energy density than gasoline, hence higher power output from the engine. I recall an article in 5.0 Mustang where they switched a 2004 Mach1 from gas to E85 and got a ~30hp and ~25tq improvement at the expense of about 2MPG...

Its worth it.
Wrong, it has less actually, but has a much higher octane rating (105 octane) So you can run higher boost levels, or compression ratios without detonation. You actually have to run 20-35% more e85 through the engine, than gasoline to produce the same power.
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Unread 10-17-2010, 07:07 PM   #19
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Wrong, it has less actually, but has a much higher octane rating (105 octane) So you can run higher boost levels, or compression ratios without detonation. You actually have to run 20-35% more e85 through the engine, than gasoline to produce the same power.
hence why you get lower gas mileage
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Unread 10-17-2010, 07:14 PM   #20
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Wrong, it has less actually, but has a much higher octane rating (105 octane) So you can run higher boost levels, or compression ratios without detonation. You actually have to run 20-35% more e85 through the engine, than gasoline to produce the same power.
I believe you misread his post...cause you just proved his point lol
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