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Dirt Bike Mods & Maintenance
Has anyone used VP Ultimate 2 ?
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[QUOTE="Rich Rohrich, post: 656734, member: 16241"] B02 is definitely MTBE based and will lean things out due to the additional O2. I've used as much as 35% without hurting anything other than the fuel curve. But here's the hook, in addition to the fuel curve changes B02 has an effect similar to advancing the ignition timing. It shortens the initial ignition delay period, and causes a faster pressure rise. Even though it has a high octane rating it can easily cause engines to knock if you over do it. I have found that it's best to sneak up on it. The ability to adjust the ignition curve with a programmable 3d ignition can be a real advantage when playing with this stuff. B03 is I believe Pentane based with no additional O2 so it will tend to make things a bit richer due to more vaporized fuel making it's way to the combustion chamber. In the past I've used Acetone in an attempt to get a similar effect when the air temps are down, but based on conversations with Dr. Dave his blend should work much better. No surprise there. :thumb: B04 is something with a high boiling point, probably an aromatic hydrocarbon that can be used to help cool the piston crown. I'll probably be talking to Dr. Dave this weekend so I'll try and get some additional [b]specific[/b] details. I've been thinking about doing a full interview with him for a while now. Maybe this is a good starting point to work from. [/QUOTE]
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MX, SX & Off-Road Discussions
Dirt Bike Mods & Maintenance
Has anyone used VP Ultimate 2 ?
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