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Discussion Starter · #1 ·
Here's a nice link I came across.....will help out everyone out there that likes to give their R a little "race blend" every once in a while......<p><A HREF="http://www.osbornauto.com/racing/blend.htm" TARGET="_blank">http://www.osbornauto.com/racing/blend.htm</A>
 

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Re: Octane Blending...... (s60rdood)

I wish the gallons on the chart went up to 20 or so. Also, they state to put in the 92 first, then the amount of gallons of 100 octane. I have always done it the other way: put in 5 gallons of 100, then fill with 91. this way, the high octane gas gets blended better, or so I would think. oclv
 

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Re: Octane Blending...... (frankhoffy)

My gas station sells 94 octane as premium and 110 octane <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> racing gas, or so the sign on the pump states. I wondered if that would even be safe to put in my car <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> ?
 

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Re: Octane Blending...... (Quick Brick)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>frankhoffy</b> »</i></TD></TR><TR><TD CLASS="quote">So, filling up an almost empty tank with 100 octane would be bad?</TD></TR></TABLE><p>not at all!<p><TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Quick Brick</b> »</i></TD></TR><TR><TD CLASS="quote">My gas station sells 94 octane as premium and 110 octane <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> racing gas, or so the sign on the pump states. I wondered if that would even be safe to put in my car <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> ?</TD></TR></TABLE><p>too low of an octane is bad, but there is no such thing as too high <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/biggrin.gif" BORDER="0"><p>I have used straight 104 (Sunoco) and it smelled so healthy
 

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Re: Octane Blending...... (Quick Brick)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>Quick Brick</b> »</i></TD></TR><TR><TD CLASS="quote">My gas station sells 94 octane as premium and 110 octane <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/eek.gif" BORDER="0"> racing gas, or so the sign on the pump states. I wondered if that would even be safe to put in my car <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/confused.gif" BORDER="0"> ?</TD></TR></TABLE><p>Make sure the 110 is an unleaded fuel. Typically fuels with 105+ octane are leaded. If it is unleaded, go have some fun <IMG NAME="icon" SRC="http://********************/smile/emthup.gif" BORDER="0">
 

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Re: Octane Blending...... (frankhoffy)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD><i>Quote, originally posted by <b>frankhoffy</b> »</i></TD></TR><TR><TD CLASS="quote">So, filling up an almost empty tank with 100 octane would be bad?</TD></TR></TABLE><p>Not at all, but it's a little overkill. Aim to get a blended amount of 94-95.
 

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Discussion Starter · #8 ·
Re: Octane Blending...... (George @ ViVA)

George- That's right......everyone, DO NOT use LEADED GAS.....you WILL melt the inside of the cat and FRY your o2 sensors........but ooooo does it smell good <IMG NAME="icon" SRC="http://www.vwvortex.com/vwbb/tongue.gif" BORDER="0">
 

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Re: Octane Blending...... (s60rdood)

here's an article with <A HREF="http://www.motortrend.com/features/performance/112_0606_sf_high_octane_fuel/" TARGET="_blank"> Rockett Fuel & MotorTrend</A><p>Motor Trend: If traditional pump-available 92/93 octane premium unleaded fuel isn't high enough octane, can I blend race gas with it? How do I know how much to blend?<p>Rockett Brand: First, remember that you should not blend leaded racing gasoline with normal pump gasoline for street use. You can blend unleaded gasoline with a high octane race unleaded fuel such as Rockett Brand 100. RocketBrand has blending charts that allow you to accurately blend to your desired octane number. You cannot accurately blend with traditional octane boosters. If your only goal is increased octane, blending pump gas with Rockett Brand 100 is an OK way to go. If you are trying to get the most performance out of your engine, use100 octane without mixing it with street gasoline. Our 100 octane burns more completely than street gasoline, thereby offering more power and less unburned hydrocarbons in the exhaust--in other words less tailpipe emissions.
 

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Re: Octane Blending...... (s60rdood)

I've been running 100/91 blend for close to a year now on every tank. Living in CA, where we can't get 93 at the pump, the goal is simply to create the 93-94 octane the car was designed for.<p>No chart is necessary to figure out the blending; the math is probably 6th grade. If "X" is the number of gallons of 100, and "Y" is the number of gallons of 91 (in this case), then the simple formula is:<p>((X * 100) + (Y * 91))/(X + Y) = octane<p>If I fill up right about when the low-fuel light comes on then I put in 5 gal of 100 and ~10 gal of 91. With the formula above that gives 94 octane. I've got two 5-gal gas cans that I fill with the 100-octane unleaded and take home so that I don't have to visit the place more than every 2-3 weeks.<p>The R is a completely different animal running 93-94 compared to 91. The car is noticeably down on power with 91 and even more noticeably down on torque. It's pathetic, really. And once you've gone from 91 to 93-94 you won't want to go back.<p>If I can no longer get 100 octane to blend -- and if I don't feel like tackling a water injection project to make it run okay on 91 -- then I'll sell it. If you, like me, live in a state where 91 is called premium, and if you've never put in 93-94 octane, then you've never actually driven your R. There's probably 30 hp and 40 lb-ft of torque left sitting on the table.
 
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