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Discussion Starter · #1 ·
what octane do you think will be required in the new LTR450? do you think vp 100 octane would be alright to run through it?
 

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I would say 91-93 octane, "premium", for the required part.

You could run vp100, but it probably wouldn't be needed unless you increased the compression and all that good stuff. But the smell... :arrow:
 

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I agree...91-93 required...

I do not think the 100 will be bad...but I have seen tests with Race gas (over 100) in stock compression actually lowering HP!

I have also seen VPU4 add 1 HP to stock bikes...
 

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Discussion Starter · #5 ·
is VPU4 specifically made for four strokes?after the gas stations around here stopped carrying 93 octane which is what my cannondale required. i started using VP performance unleaded in my cannondale,which had a 12:1 ratio and it worked really well, it was 100 oct.
 

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From VP's website:
U4
Used in stock and modified 4-stroke applications, as well as stock 2-strokes. Makes up to 6% more power than pump gas and any basic nonoxygenated racing fuel. Passes fuel rules for AMA amateur racing and is also perfect for club level racing, CCS, WERA and AFM. For optimum horsepower and performance, do not store this fuel in vehicle — drain fuel system.

• Color: Clear
• Motor Octane: 92
• Specific Gravity: .718 at 60° F

Now, take my build for example...50.54 HP on 91 octane pump gas.
50.54*.06=3.03!
Of course it said up to 6%, but can you imagine just chaning fuels and adding 3HP to my build!!! Daddy likey!

I have heard it is slightly cheaper then some of their other common fuels but I can not say from personal experience...called my dyno guy and told him to have 5 gallons in stock for me on my dyno day the week after Christmas...I want to make some runs with pump gas, drain it then some runs with the U4 to see for myself.
 

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I would assume it will run 93 octane pump gas in stock trim if not that would kill part of it's buyers not everyone is willing to run race gas to ride like most of us would! lol but vp seems to make everything run better lol!
 

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Discussion Starter · #9 ·
i don't think any engine mods will be done to doug gust or jeramia jones quads and i garantee they will be using race gas in their LTR'S.
 

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I agree...91-93 required...

I do not think the 100 will be bad...but I have seen tests with Race gas (over 100) in stock compression actually lowering HP!

I have also seen VPU4 add 1 HP to stock bikes...
Was that Leaded, lo-lead, or unleaded? Reason I ask is, I usually pickup 110 unleaded for my car And I was thinking of just using that. But if it will run better on 91 then its a no-brainer.
 

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I'm currently using VP U2. It's designed for 2 strokes and 4 strokes with high compression and it runs and smells fantastic.

Here's the specs of of the VP site: www.vpracingfuels.com


U2
Designed for stock and modified 2-stroke applications. Makes up to 6% more power than pump gas and any basic nonoxygenated racing fuel. Passes fuel rules for AMA amateur racing, and is also perfect for club level racing, CCS, WERA and AFM. Makes engines faster and more responsive without harming the carburetor, O-rings or gaskets. For optimum horsepower and performance, do not store this fuel in vehicle — drain fuel system.

• Color: Clear
• Oxygenated: Yes
• Motor Octane: 101
• Specific Gravity: .717 at 60° F
 

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I agree...91-93 required...

I do not think the 100 will be bad...but I have seen tests with Race gas (over 100) in stock compression actually lowering HP!

I have also seen VPU4 add 1 HP to stock bikes...
Was that Leaded, lo-lead, or unleaded? Reason I ask is, I usually pickup 110 unleaded for my car And I was thinking of just using that. But if it will run better on 91 then its a no-brainer.
The runs I have seen personally lowering HP were oxygenated fuels...I called VP last week and they told me any fuel over 105 on less the 13:1 compression will lower HP. I think the guy I talked to was named Bruce...

Personally I like to see the difference myself or on someone I trusts runs...I have called everywhere and no one around the Tulsa area can get U4 or U2 for that matter unless I want to purchase 55 gallons and pay the shipping. So, no testing for me!

My local Dyno shop can get 110, so I might just see what it will do...
 

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Discussion Starter · #13 ·
i just seen a pic of a close-up of the top of the gas tank of the LTR and it has a sticker on it that say's (use premium unleaded with a minimum 90 pump octane) so that answers that question i had. i would post a pic but i can't we don't have a way for me to do it :evil: we really need to get a better way to post pics around here.
 

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i talked to my dealer and me and him agreed premium at the pumps will be fine but it wont hurt to add a little race gas. to much octane is a waste of money and yes it can lower hp but if you put higher compression your gona need to run higher octane. i think stock compression is plenty high go any higher and you are gona have problems but that is just my prediction based from expreience :wink:

and just a reminder dont burn air plane fuel it isnt lubricated and your motor will run hot and youll burn your piston and you dont wanna damage the cylnder walls because it isnt just a sleeve that can be replaced it is electroplated and would be a pain in the butt to fix
 
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