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Cat upgrade to accept 110 or 100 octane, leaded fuel

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Old 03-19-2010, 02:46 PM
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2004 E320
Cat upgrade to accept 110 or 100 octane, leaded fuel

The last time I looked at the issue of putting 110 or 100 octane, leaded race fuel into an E320 or E55, basically what I heard was that it will kill the catalytic converter.

OK, so lets look at this problem from the other side:

-Is there a way to upgrade the cat to be able to handle 110, leaded fuel?
-Are there any other compnents that would be effected by the lead content or higher octane fuel?

Just so you know, this is for track purposes only and wouldn't be daily-driven @ 110 gas. It would most likely use 15-20 gallons in 1.5hrs-2hrs at Laguna Seca.
Old 03-19-2010, 02:54 PM
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Why not just run 100 unleaded and call it good...
Old 03-19-2010, 03:00 PM
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Originally Posted by citylightva
Why not just run 100 unleaded and call it good...
I believe both the 110 and 100 octane fuels are leaded. I mean if we could find 100 somewhere within an hour of the track we'd grab it. We would just rather be using the stuff the Le Man's cars are using.
Old 03-19-2010, 04:01 PM
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Originally Posted by Merked E320
I believe both the 110 and 100 octane fuels are leaded. I mean if we could find 100 somewhere within an hour of the track we'd grab it. We would just rather be using the stuff the Le Man's cars are using.
Gotcha...That makes sense...A couple of the drag strips around Dallas have 100 unleaded, but I can see how LS would not...Haha just pull your cats for the day...Kidding...Sorry I am absolutely no help, but I don't think you can make your cats work with leaded...
Old 03-19-2010, 04:22 PM
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E-ZGO 53hp., 1999 E 430 sport, 2004 E 55, 2008 Tahoe LTZ on 24"s
Race fuel for a 320?
order from

Murrieta, CA
Phone: 951-696-5100
Fax: 951-696-5577
vppacific@vpracingfuels.com

http://www.vpracingfuels.com/road-racing-drifting.html
Old 03-19-2010, 04:25 PM
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Not only does leaded race fuel kill cats, it kills O2 sensors. They make 100+ octane unleaded fuels. Sunoco is one such company that is used in racing
Old 03-19-2010, 05:29 PM
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Originally Posted by blackbenzz
Not only does leaded race fuel kill cats, it kills O2 sensors. They make 100+ octane unleaded fuels. Sunoco is one such company that is used in racing
+1 on the 02 sensors! I believe 76 stations sell 100 octane unleaded gas in certain locations. There is a station in either Ontario or Chino off Euclid that sells it. You'd have to be running some high boost to necessitate the use of fuels higher than 100 octane on our cars.
Old 03-19-2010, 06:28 PM
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Originally Posted by Merked E320
The last time I looked at the issue of putting 110 or 100 octane, leaded race fuel into an E320 or E55, basically what I heard was that it will kill the catalytic converter.

OK, so lets look at this problem from the other side:

-Is there a way to upgrade the cat to be able to handle 110, leaded fuel?
-Are there any other compnents that would be effected by the lead content or higher octane fuel?

Just so you know, this is for track purposes only and wouldn't be daily-driven @ 110 gas. It would most likely use 15-20 gallons in 1.5hrs-2hrs at Laguna Seca.
sunaco sells 100 race fuel that is unleaded ... there also is a 104 street blaze thats unleaded .. i ran c-16 118 leaded in my car for my last run and it made a huge difference .. but to benefit with the high octane u would need a race tune file . also leaded will hurt cats so i would advice not to .. but i'm catless and the other thing about the 02 sensor is if u run leaded all the time it can do damage but once in awhile wont hurt anything at all and i'm talking from me doing it in my car ..
Old 03-19-2010, 06:38 PM
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a quarter mile at a time
uhhhhh, just curious, what kind of mods are on your E320 to look into +100 octane fuel?
Old 03-19-2010, 07:07 PM
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Originally Posted by Yacht Master
Race fuel for a 320?[/url]
Originally Posted by e1000
uhhhhh, just curious, what kind of mods are on your E320 to look into +100 octane fuel?
Old 03-19-2010, 07:16 PM
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Originally Posted by Merked E320
The last time I looked at the issue of putting 110 or 100 octane, leaded race fuel into an E320 or E55, basically what I heard was that it will kill the catalytic converter.

OK, so lets look at this problem from the other side:

-Is there a way to upgrade the cat to be able to handle 110, leaded fuel?
-Are there any other compnents that would be effected by the lead content or higher octane fuel?

Just so you know, this is for track purposes only and wouldn't be daily-driven @ 110 gas. It would most likely use 15-20 gallons in 1.5hrs-2hrs at Laguna Seca.
I see that you are here/near the bay area. VP sells 100 Octane Unleaded and so does ERC in San Lorenzo. ERC can make any blend of fuel you want leaded or unleaded.
Old 03-20-2010, 01:06 AM
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2004 E320
Originally Posted by e1000
uhhhhh, just curious, what kind of mods are on your E320 to look into +100 octane fuel?

No Mods on the E320, just the racing wheel and tire setup.

I wanted to look into this because, if it was some easy mod's I would have loved to upgrade since I have access.

Also for next season I will be running a 335i Coupe which is boosted, and if I could understand the concepts necessary to handle that kind of fuel, it would be nice. Learn about it now and really apply it next season.

Thanks though!
Old 03-20-2010, 01:22 AM
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On your E320, unless you slap on a supercharger, turbos, or nitrous, and then compliment them with a tune, you would see no gains from the higher octane race fuels. Just stick with the 91 octane California crappy gas or try the VP 94 octane.

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