Octane Question

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    Offline hemidude426ci

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    Octane Question
    « on: July 01, 2008 - 12:19:50 PM »
    My 'Cuda has 11.5:1 Compression and the highest grade fuel I can buy locally is 91, which octane booster is most effective? I've heard good things about 104, thoughts, comments?
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    Offline GoodysGotaCuda

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    Re: Octane Question
    « Reply #1 on: July 01, 2008 - 12:35:15 PM »
    If you go through the steps to set your car up right for it. E-85 i think is 110 octane? That is if it's in your area...
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    Offline Changin Gears

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    Re: Octane Question
    « Reply #2 on: July 01, 2008 - 12:38:19 PM »
    In my area 93 octane is $4.25 and 110 octane race gas is $5.59.  With that much compression just run race gas, or a mixture.
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    Offline hemidude426ci

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    Re: Octane Question
    « Reply #3 on: July 01, 2008 - 05:10:51 PM »
    Yea, I live in the SF bay area, so at Sears Point, the local raceway 97 is about $7.50 and I want to actually be able to drive my 'Cuda. Are there any chemicals I can mix into my fuel to boost my octane from 91 to at least 94ish?
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    Offline pink panther

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    Re: Octane Question
    « Reply #4 on: July 01, 2008 - 05:12:21 PM »
    I use the 104 booster and premium gas, If I don't the chally doesn't run quite right.
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    Offline 73Chally

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    Re: Octane Question
    « Reply #5 on: July 01, 2008 - 05:20:40 PM »
    Are your heads steel or aluminum?  If aluminum, you might be able to get away with the 91 for mild street driving, although 93 would be preferable.  At least that way you would only need to add the 104 when you want to run it hard.  If your heads are steel, then I would definitely go with the 104 Boost.  From what I have seen it is one of the better additives on the market.
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    Offline OUTLAW

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    Re: Octane Question
    « Reply #6 on: July 01, 2008 - 05:32:37 PM »
    Toululene is 114 octane and I run it with a mix of 91 octane..around here Sunoco 110 octane is $7.00 a gal  
    With my 13:1 comp ratio I roll my timing back a bit (for every day driving) and run a mix of QT 91 octane and toululene -for racing I bump my timing back up and use straight 110 or 118 octane ($9.00 a gal)

    here is the formula for figuring octane with toululene (xylene is 110 octane but have never used it )

    It's just simple averaging. For example:
    3 gallons of 101 = 303; 2 gallons of 114 = 228
    303 + 228 = 531
    531 / 5 (total # gals) = 106 octane  

    it is not recommended to use more than 30% mixture and 20% is more acceptable

    3 gals of 91=273 + 1gal toululene=114 ...(25% ratio)

    273 +114=387 /4= 96.7 octane


    you get the idea



    all the "boosters" do is raise octane .2 of a point (equal to injector cleaner...LOL)
    « Last Edit: July 01, 2008 - 05:34:16 PM by OUTLAW »
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    Offline MEK-Dangerfield

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    Re: Octane Question
    « Reply #7 on: July 01, 2008 - 05:34:43 PM »
    This is what I use. It's a lead substitute. Thanks for turning me onto this OldSchool.   :thumbsup:

    http://www.kemcooil.com/products.php?cId=4



      Mike
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    Offline Oldschool

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    Re: Octane Question
    « Reply #8 on: July 01, 2008 - 06:44:32 PM »
    Quote from: MEK-Dangerfield on July 01, 2008 - 05:34:43 PM
    This is what I use. It's a lead substitute. Thanks for turning me onto this OldSchool.   :thumbsup:

    http://www.kemcooil.com/products.php?cId=4



      Mike





     :2thumbs:   That stuff has TetraEthyl Led (TEL) in it and it flat out works.  Plus, the proportion chart is idiot proof---which was a HUGE plus for me....    :bigsmile:   
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    Offline ntstlgl1970

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    Re: Octane Question
    « Reply #9 on: July 01, 2008 - 06:59:45 PM »
    Can you get that stuff in CA though? And they let street cars fill up with race gas at Infineon now? that is news to me and very cool if true. used to be you weren't allowed to pump gas into your car unless it was a race car only - as in no license plates - I might be remembering the leaded race gas though...
    « Last Edit: July 01, 2008 - 07:46:27 PM by ntstlgl1970 »
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    Offline Oldschool

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    Re: Octane Question
    « Reply #10 on: July 01, 2008 - 07:15:33 PM »
    Quote from: ntstlgl1970 on July 01, 2008 - 06:59:45 PM
    Can you get that stuff in CA though?



    It should be available in Ca.  You can order it off of the company website.  It states that it is for off road use only, but they aren't responsible for the consumer actions after the purchase...    :naughty:   
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    Offline ntstlgl1970

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    Re: Octane Question
    « Reply #11 on: July 01, 2008 - 07:34:05 PM »
    OS - you're right, I went in and loaded up my cart, the disclaimer doesn't mention it being illegal in california.

    IMO I think this (the lead additive) would be the most reasonable solution for the octane problem unless you live close to Infineon/Sears Point or one of these other gas stations. On this website, they list stations pumping high octane gas in northern california:

    http://personal.linkline.com/dbarton/Unleaded_Racing_Fuel_in_SoCal.html

    I threw a couple of addresses in here since I don't know where you live....

    Los Altos
    VP / Rancho Auto Service
    601 Rancho Shopping Center (Riverside Dr & Fremont Ave near Foothill Expwy) 650-948-1365
    VP StreetBlaze 100 unleaded at the pump 06/13/08  $7.50

    Rancho Cordova/Sacramento
    Teegarden Motorsports Specialties
    11383 Pyrites Way, Rancho Cordova  916.638.RACE(7223) 
    http://www.teegardenmotorsports.com/about.htm
    They offer Trick brand 100 octane unleaded a little differently. 
    Not at a traditional pump, but and old style pump (with rotating numbers) that draws the fuel from 50 gallon barrels.  05/02/08 about $8.00

    Redwood City
    Kings Union 76
    975 Woodside Road  (650) 364-9620  http://www.kings76.com
    Torco 100 unleaded at the pump 06/13/08 $5.99

    San Leandro
    Richard's Automotive
    1495 Hayes Rd.,  510-483-4318
    VP StreetBlaze 100 and 93 unleaded at the pump 04/20/08 $6.31
    Other VP fuels in pails.

    Sonoma
    Infineon-Sears Point Raceway
    29265 Arnold Dr, Sonoma
    http://www.searspoint.com/  800-870-7223
    The track (and race gas pump) is open to the public Monday through Friday from 8:00AM to 5:00PM with the exception of some major event days.  As far as weekends go, some of the smaller events do not have an admission fee and even the ones that do are usually $10 - $20. To be sure, you can check first before driving out there by calling 800-870-7223 and pressing “0” to speak to the receptionist.
    Fuel supplied by Sunoco Fuel, credit card only.
    100 octane unleaded at the pump 02/08/08

    « Last Edit: July 01, 2008 - 07:45:40 PM by ntstlgl1970 »
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    70 Cuda, 7.0L Gen-III Hemi, Viper T56 w/9310 gearset, 3.91's, Megasquirt MS3x v3.57, Innovate wideband, Firm Feel upper arms, torsion bars, springs and strut rods, QA1 DA shocks. I did everything on this car except the fancy paint stuff and I drive it...and I can't seem to stop messing with it....
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