100 oct racing fuel - MBWorld.org Forums

Feb 19, 2005 | 01:04 PM

leadfoot

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100 oct racing fuel

Hey guys found a unocal76 gas station that sells 100oct. racing fuel.Can you run this fuel in our 55's.Would it be beneficial or would it **** up the engine.Inputs appreciated.

Feb 19, 2005 | 02:49 PM

draggingcents2

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Joined: May 2004

Posts: 371

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From: OC

2005 E55

Quote:

Originally Posted by leadfoot

Hey guys found a unocal76 gas station that sells 100oct. racing fuel.Can you run this fuel in our 55's.Would it be beneficial or would it **** up the engine.Inputs appreciated.

It will help some and it will hurt hurt just help. What are the cross streets and town of the 76 station???

Feb 19, 2005 | 03:00 PM

leadfoot

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You made no sense.Do you reread what you write?

Feb 19, 2005 | 03:19 PM

Jakpro1

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Posts: 7,092

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From: Salt Lake City (but not Morm)

2003 E55 & 2014 GL550

Honestly dude, from all the research I have done....it's only good for a few HP and 476/490 (whichever you believe 55's have) to 480/495 really isn't noticeable.

Using info from Hot Rod test of high octane fuels on the dyno.....actually it was racing gas so you might not even get that much HP.

Just my humble....some will differ and that's okay.

http://www.hotrod.com/techarticles/72498/

Last edited by Jakpro1; Feb 19, 2005 at 04:42 PM.

Feb 19, 2005 | 06:27 PM

DerekFSU

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I've run both 100 and 105 octane. Heard it can damage the oxygen sensor. Never saw any gains with it so haven't done it since.

Feb 19, 2005 | 10:13 PM

Stephen04E55

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Joined: Nov 2003

Posts: 881

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From: Mechanicsville, VA

'09 CLK550, '18 AMG GTR, '06 C55 AMG, '25 GLS450, 09 E63

If the 100 octane was unleaded it will not harm your 02 sensors. Only leaded racing fuel will harm your 02 sensors.

Feb 19, 2005 | 10:34 PM

vrus

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Joined: May 2004

Posts: 3,797

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From: Richmond Hill, Ontario

2003 E55 AMG

If you want to increase the octane rating in your fuel and create better combustion, just drop some pure methanol into your gas tank.

I am not sure what the proper ratio of fuel/methanol should be, but it is cheaper and should be easier to find than race fuel.

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Feb 20, 2005 | 02:05 AM

Evolution Marine

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Joined: Nov 2004

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From: So. Cal.

2006 CLS55-030, 2002 BMW 540 Wagon, 1995 VW Jetta GLX

More HP

leadfoot - Anything over 94 Octane Unleaded Fuel the ECU can not advance the timing enough to take advantage of the added octane, so 100 Octane fuel is not necessary with OEM programming in the ECU. Reprogram the ECU for the 100 octane race fuel and more boost and you will be able to take adavntage of the added octane, however you will need switchable ECU programing ability to be able to run pump gas when you are not running race fuel. You will also need the ability to switch cleanly between the fuels which requires an oxcilliary fuel tank for the race fuel and some solenoid valves, fuel lines, and some electrical work.

- Bob