Leaded race fuel? - BMW S1000RR Forums: BMW Sportbike Forum
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post #1 of 24 (permalink) Old 06-18-2017, 11:36 AM Thread Starter
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Leaded race fuel?

I just got the Brentune stage 2 alpha n flash on my 15 and i want to see what this thing can really do. Nice smooth power band and definitely more power mid range just on 93. The only pump race fuel i can find in St.Louis is 110 leaded... so whats the deal with leaded fuel? I have a danmoto cat delete but i still have the 02 sensors installed.. should i reset the adaptations then run bike with 93 octane till it stores new maps then remove the 02 sensors and put in the 110 octane? Or just leave the 02 sensors in and put 110 leaded in? Or should i never put leaded fuel in this thing if i want it to last? I heard VP's MR12 has lead in it also. True?
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post #2 of 24 (permalink) Old 06-18-2017, 12:12 PM
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Leaded race fuel?

Leaded fuel is very hard on o2 sensors, especially if it is running rich. They can burn out an o2 sensor in a couple of tanks of gas. I have run avgas fuel which is low lead 100 octane but I alway mix it half and half with pump gas. I have ran atleast 30 tanks like that without any issues but I'm also running completely stock fuel mapping.

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post #3 of 24 (permalink) Old 06-18-2017, 12:43 PM Thread Starter
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Yea i was thinking 100 low lead avgas might be a better option. What about that VP T4? Is it leaded? Also does anyone know if i remove my 02 sensors is it going to make my bike perform less desirably with the Brentuning stage 2 flash?
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post #4 of 24 (permalink) Old 06-18-2017, 05:57 PM
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VP PRO6 is the unleaded version of MR12.
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post #5 of 24 (permalink) Old 06-19-2017, 10:37 AM Thread Starter
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Originally Posted by RansomT View Post
VP PRO6 is the unleaded version of MR12.
Ok is that a newer product? How does it compare to MR12? What about T4? The guy that dyno'd my bike said he recommends VP T4.. So is 110 leaded a bad idea? Too much lead compared to MR12 or about the same?
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post #6 of 24 (permalink) Old 06-19-2017, 11:14 AM
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Did they tune your bike for 110 or 93 pump gas? If they didn't, you will likely see no gain at all, I wouldn't be surprised if it dynoed less. And def find a gas station around that has VP instock or that will order you some... there's a lot around. Let us know what she does!
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post #7 of 24 (permalink) Old 06-19-2017, 11:47 AM
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post #8 of 24 (permalink) Old 06-19-2017, 12:07 PM
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Quote:
Originally Posted by Luker669 View Post
Leaded fuel is very hard on o2 sensors, especially if it is running rich. They can burn out an o2 sensor in a couple of tanks of gas. I have run avgas fuel which is low lead 100 octane but I alway mix it half and half with pump gas. I have ran atleast 30 tanks like that without any issues but I'm also running completely stock fuel mapping.

False.. I have ran VP C16 for over 6 months in various vehicles without having a 02 sensor failure, its not like you daily ride on the fuel. Leaded fuels will eventually kill an 02 sensor but it doesn't happen that fast. Typically most race guys don't have their choice of race fuel at the pump so they buy of either a race shop or have it shipped to them. I understand the convenience factor but always make sure your getting top quality. You can find 116 unleaded but traditionally most drag bike guys run oxygenated fuels like VP U4.4 and MR12 , MR12 is usually a top pick but very expensive also oxygenated fuels have a short shelf life and are hard on fuel lines so typically after a race most guys drain the tank and run pump gas.

Last edited by Force Induced; 06-19-2017 at 12:16 PM.
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post #9 of 24 (permalink) Old 06-19-2017, 12:14 PM
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Originally Posted by BuiltLikeGoku View Post
Yea i was thinking 100 low lead avgas might be a better option. What about that VP T4? Is it leaded? Also does anyone know if i remove my 02 sensors is it going to make my bike perform less desirably with the Brentuning stage 2 flash?
Always run your 02 sensors for safety and performance reasons, with the sensors the engine is running blind and cant tell what the AFR coming out of the engine. Also Avgas is a touch higher octane but not really worth it if your trying to push pass 93 pump gas best bet is just get a race fuel.
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post #10 of 24 (permalink) Old 06-19-2017, 03:15 PM Thread Starter
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Looks like T4 may be the way to go if i want to keep it unleaded and isn't too awful expensive. Sounds like i could probably get away with running leaded fuel every now and then but not run it constantly. Anybody know anything about octane boosters for pump fuel? Is Torco good or extremely corrosive? Does it matter?
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