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Mixing premium with purple gas (110). Help me out here.
#594788
01/26/10 06:50 PM
01/26/10 06:50 PM
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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My GTX has a problem with pre-detonation and I'm trying to take care of it. The 440 has stock replacement forged pistons and the stock 906's have been shaved (0.010" or 0.030" I forget).
I have been adding a quart of Octane Supreme to 10 gallons of fuel and that seemed to help but not take care of it. According to the info on Octane Supreme this mixture should raise my octane by 8.0 full points putting 92 premium at 100 octane, but I'm not sure how much I believe that.
Anyway, that costs $10 extra for a tank full. I just called our local distributor and I can get purple gas (110) for $11/gallon in a 55 gallon drum. If I mix 50/50 that would cost me an additional $30.00 over that of the Octane Supreme but I was hoping it would work better.
Long story longer...what octane does my car need and when you mix fuels do you just average the octane (50/50 of 92 and 110 is 101)???
What do you do?
Last edited by VITC_GTX; 01/26/10 07:34 PM.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: 3ddart]
#594795
01/26/10 07:54 PM
01/26/10 07:54 PM
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Joined: Jan 2003
Posts: 25,200
Upper Midwest
MoparforLife
Too Many Posts
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Too Many Posts
Joined: Jan 2003
Posts: 25,200
Upper Midwest
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What are you running for timing? You can also try to back it off just a tish and see what happens.
Clean it, if it's Dirty. Oil it, if it Squeaks.
But: Don't fix it, if it Works!
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: 3ddart]
#594796
01/26/10 07:58 PM
01/26/10 07:58 PM
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
VITC_GTX
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OP
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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Quote:
van: i have it as a favorite and that's the addy it gives. it is a spread sheet that you input you octain and it does the math to tell you what the combo works out to. maybe someone smarter with puters then me can help you out. dave
Thanks, I'm sure I'll figure it out.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: MoparforLife]
#594797
01/26/10 08:05 PM
01/26/10 08:05 PM
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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Quote:
What are you running for timing? You can also try to back it off just a tish and see what happens.
Dizzy was redone by FBO. If memory serves it's ~15 initial and 35 total right now.
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Re: Mixing premium with purple gas (110). Help me out here.
[Re: 3ddart]
#594798
01/26/10 08:56 PM
01/26/10 08:56 PM
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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Quote:
van: i have it as a favorite and that's the addy it gives. it is a spread sheet that you input you octain and it does the math to tell you what the combo works out to. maybe someone smarter with puters then me can help you out. dave
Got it to work, thanks 
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Re: Mixing premium with purple gas (110). Help me out h
[Re: VITC_GTX]
#594802
01/26/10 09:55 PM
01/26/10 09:55 PM
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Joined: Aug 2003
Posts: 8,716
Baltimore/Denver
64Post
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master
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Posts: 8,716
Baltimore/Denver
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Auto or man tranny? If auto, does it kickdown? Rough RPM range where detonation begins?
And where's the bog you're trying to get rid of?
Last edited by 64Post; 01/26/10 10:01 PM.
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Re: Mixing premium with purple gas (110). Help me out h
[Re: VITC_GTX]
#594803
01/26/10 10:11 PM
01/26/10 10:11 PM
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Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
RapidRobert
Circle Track
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Circle Track
Joined: Nov 2003
Posts: 36,041
Lincoln Nebraska
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Quote:
I'm hoping that 100 octane will do the trick, I would hate to run straight 110 but if I have to I will (assuming that is enough).
Any pinging is very damaging and must be stopped immediately. I'd empty the tank & add 5 gal of 100 & if no ping I'd then add 2&1/2 gal of pump gas, shake the trunk violently to mix it & repeat,& if no ping (you're at 50/50) continue to add a gal at a time, mix & repeat & doing the math keeping your tryouts brief as the amt used will skew your proportions. If it pings @ 50/50 go the other way. I would have your initial/total/springs/vac adv in the accepted norm for your eng (bb or sb) then give it as much octane as it requires to handle that amt of timing.EDIT if fact I would start w 100 & max your timing (those 4 parts IN ORDER) then start reducing the proportion. WOT on your hottest/driest day will require the max octane.
Last edited by RapidRobert; 01/27/10 12:37 AM.
live every 24 hour block of time like it's your last day on earth
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Re: Mixing premium with purple gas (110). Help me out h
[Re: RapidRobert]
#594804
01/26/10 10:22 PM
01/26/10 10:22 PM
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Joined: Mar 2003
Posts: 15,491
the boonies
aarcuda
I Live Here
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I Live Here
Joined: Mar 2003
Posts: 15,491
the boonies
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disconnect the vacuum advance and plug it. dont use it. you shouldnt ping with that cam and a stock motor with 93 octane. Unless you have a ton of carbon in the cylinders.
try knock any carbon out by using the old water in the carb trick
It's got a cop motor, a 440 cubic inch plant, it's got cop tires, cop suspensions, cop shocks. It's a model made before catalytic converters so it'll run good on regular gas.
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Re: Mixing premium with purple gas (110). Help me out h
[Re: aarcuda]
#594805
01/26/10 10:26 PM
01/26/10 10:26 PM
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
VITC_GTX
OP
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OP
master
Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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Quote:
disconnect the vacuum advance and plug it. dont use it. you shouldnt ping with that cam and a stock motor with 93 octane. Unless you have a ton of carbon in the cylinders.
try knock any carbon out by using the old water in the carb trick
No vacuum advance, it's gone.
Stock motor with heads shaved a little.
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Re: Mixing premium with purple gas (110). Help me out h
[Re: 64Post]
#594806
01/26/10 10:29 PM
01/26/10 10:29 PM
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Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
VITC_GTX
OP
master
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OP
master
Joined: Mar 2003
Posts: 4,930
Tri-Cities, Washington
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Quote:
Auto or man tranny? If auto, does it kickdown? Rough RPM range where detonation begins?
And where's the bog you're trying to get rid of?
Auto, it doesn't kick down as early as I like but does kick down.
No tach (tic toc isn't accurate with electonic ignition) but I'm guessing 2500-3000ish 
Bog is off the line. I changed squirters and it got better but it's not right yet. The car will only spin the tires for ~30 feet.
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