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Lower octane
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iEatCheezInc
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PostPosted: Mon Feb 27, 2006 8:02 pm    Post subject:  Lower octane Reply with quote

I have the DHP PCM and I run 93 octane and have for about the year I have had it. They suggest atleast 91 octane. Well today I went and got gas and I told the guy to fill it up V-Power, well I always watch them when they fill my tank. Well today it paid off for he hit the regular and was putting the nozzle in my tank when I popped my head out the window and told NO! v-power. Well what would happen if I didn't catch him? What kind of problems would it create?

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PostPosted: Mon Feb 27, 2006 8:06 pm    Post subject:   Reply with quote

Depends on how you drive your car. I had a DHP tune on my car and never ran 91+ and never had any problems.

The worst that could happen is you run a little too lean and you hear knocking. If this happens, run the car nicely until the next fillup.
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PostPosted: Mon Feb 27, 2006 8:30 pm    Post subject:   Reply with quote

Blackf0rk is right, a little lean and some knock. If it bothered you you can add a little +7 octane booster. That should bring you back to the 93-94 mark.

But as long as you keep your foot out of it, it should't be a problem.

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PostPosted: Mon Feb 27, 2006 8:32 pm    Post subject:   Reply with quote

Pitch Black SS wrote:
Blackf0rk is right, a little lean and some knock. If it bothered you you can add a little +7 octane booster. That should bring you back to the 93-94 mark.

But as long as you keep your foot out of it, it should't be a problem.


hmmm, octane booster!!! where could I pick up such a product? would it hurt to add to premium fuel? so id have like 100 octane?

I dont know much about the octane ratings and what they mean, so I'm not sure if that would hurt the car or not. but it would just be close to racing fuel wouldnt it?

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PostPosted: Mon Feb 27, 2006 8:57 pm    Post subject:   Reply with quote

Yeah I didn't think there would be too much of a problem.

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PostPosted: Mon Feb 27, 2006 9:16 pm    Post subject:   Reply with quote

I wouldnt go to high, I've caused damage in the past to a car when I added 110 octane boost to an 87 octane motor. A $650 lesson!

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PostPosted: Mon Feb 27, 2006 9:23 pm    Post subject:   Reply with quote

Ouch! ok, ill learn from your lesson.

thanks.

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PostPosted: Mon Feb 27, 2006 10:05 pm    Post subject:   Reply with quote

But if you want to add some octane booster. You can get it almost any auto part store. But like PitchBlackSS said you add too much..... Smile

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PostPosted: Mon Feb 27, 2006 10:07 pm    Post subject:   Reply with quote

Pitch Black SS wrote:
I wouldnt go to high, I've caused damage in the past to a car when I added 110 octane boost to an 87 octane motor. A $650 lesson!


Yeah thats not good. I never run any higher or lower than 93. occasionally 94 but they dont carry that anymore so.

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PostPosted: Tue Feb 28, 2006 2:14 am    Post subject:   Reply with quote

octane does not serve any other purpose than to slow the burning of the fuel. Higher octane does not mean higher power

That is why higher compression engines require high octane fuel. Compressing the Air:Fuel mixture creates heat and if compressed enough the fuel will begin to burn before it is intended to. for example. Diesel engines have a compression ratio of like 19:1. And dont use spark plugs because at this high of compression the fuel ignites on its own because of the heat generated. I forget what compression ratio our cars have but it is not high enough to require a higher octane fuel. Im not sure what is changed in the DHP PCMs to make them require higher octane. But i can tell you that if you dont use the required octane than you will get preignition or knock. This is very harmful to your engine and can not be allowed to happen!

sorry. i like to explain stuff Smile i like to talk about what i learn

Pitch Black SS wrote:
I wouldnt go to high, I've caused damage in the past to a car when I added 110 octane boost to an 87 octane motor. A $650 lesson!


Im going to go out on a limb here and guess you burned some exhaust valves?

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PostPosted: Tue Feb 28, 2006 6:57 pm    Post subject:   Reply with quote

slb785 wrote:
Im going to go out on a limb here and guess you burned some exhaust valves?


Yup....But it was fun doing so!!!

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PostPosted: Tue Feb 28, 2006 8:13 pm    Post subject:   Reply with quote

Warning: I'm not responsible if anyone uses any of these ideas and has any adverse reactions or damage Twisted Evil The following information was obtained from Clubcobra.com

You could always use one of these homebrew boosters instead of the off the shelf "octane boosters"

Formula #1 - Toluene
R+M/2.........114
Cost...........$2.50/gal
Mixtures with 92 Octane Premium
10%...........94.2 Octane
20%...........96.4 Octane
30%...........98.6 Octane
Notes: Common ingredient in Octane Boosters in a can. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Often costs $3-5 for 12-16 ounces, when it can be purchased for less than $3/gal at chemical supply houses or paint stores.

Formula #2 - Xylene
R+M/2.........117
Cost...........$2.75/gal
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........97.0 Octane
30%...........99.5 Octane
Notes: Similar to Toluene. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Usually mixed with Toluene and advertised as *race formula*.

Formula #3 - Methyl-tertiary-butyl-ether (MTBE)
R+M/2.........118
Cost...........$3.50/gal
Mixtures with 92 Octane Premium
10%...........94.6 Octane
20%...........97.2 Octane
30%...........99.8 Octane
Notes: Oxygenate. Very common in octane booster products. Has lower BTU content than toluene or xylene, but oxygenate effect makes the gasoline burn better and produce more energy.

Formula #4 - Methanol or Ethanol
R+M/2.........101
Cost...........$0.60 - $1.75/gal
Mixtures with 92 Octane Premium
10%...........94.3 Octane (Methanol)
10%...........94.7 Octane (Ethanol)
20%...........Not Recommended
Notes: Methanol is wood alcohol. Ethanol is grain alcohol and found in Gasohol in 10% ratios. Both alcohols are mildly corrosive and will eat gas tank linings, rubber and aluminum if used in excessive ratios. Main ingredient in "Gas Dryers", combine with water.

Formula #5 - Isopropyl Alcohol and Tertiary Butyl Alcohol
R+M/2.........101
Cost...........$0.60-$1.50/gal
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........Not Recommended
30%...........Not Recommended

*EDIT* Here's some good reading on the use of octane, CR and boosters
http://www.diabolicalperforman.....ctane.html

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PostPosted: Tue Feb 28, 2006 9:41 pm    Post subject:   Reply with quote

Loaded05 wrote:
Warning: I'm not responsible if anyone uses any of these ideas and has any adverse reactions or damage Twisted Evil The following information was obtained from Clubcobra.com

You could always use one of these homebrew boosters instead of the off the shelf "octane boosters"

Formula #1 - Toluene
R+M/2.........114
Cost...........$2.50/gal
Mixtures with 92 Octane Premium
10%...........94.2 Octane
20%...........96.4 Octane
30%...........98.6 Octane
Notes: Common ingredient in Octane Boosters in a can. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Often costs $3-5 for 12-16 ounces, when it can be purchased for less than $3/gal at chemical supply houses or paint stores.

Formula #2 - Xylene
R+M/2.........117
Cost...........$2.75/gal
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........97.0 Octane
30%...........99.5 Octane
Notes: Similar to Toluene. 12-16 ounces will only raise octane 2-3 *points*, i.e. from 92 to 92.3. Usually mixed with Toluene and advertised as *race formula*.

Formula #3 - Methyl-tertiary-butyl-ether (MTBE)
R+M/2.........118
Cost...........$3.50/gal
Mixtures with 92 Octane Premium
10%...........94.6 Octane
20%...........97.2 Octane
30%...........99.8 Octane
Notes: Oxygenate. Very common in octane booster products. Has lower BTU content than toluene or xylene, but oxygenate effect makes the gasoline burn better and produce more energy.

Formula #4 - Methanol or Ethanol
R+M/2.........101
Cost...........$0.60 - $1.75/gal
Mixtures with 92 Octane Premium
10%...........94.3 Octane (Methanol)
10%...........94.7 Octane (Ethanol)
20%...........Not Recommended
Notes: Methanol is wood alcohol. Ethanol is grain alcohol and found in Gasohol in 10% ratios. Both alcohols are mildly corrosive and will eat gas tank linings, rubber and aluminum if used in excessive ratios. Main ingredient in "Gas Dryers", combine with water.

Formula #5 - Isopropyl Alcohol and Tertiary Butyl Alcohol
R+M/2.........101
Cost...........$0.60-$1.50/gal
Mixtures with 92 Octane Premium
10%...........94.5 Octane
20%...........Not Recommended
30%...........Not Recommended

*EDIT* Here's some good reading on the use of octane, CR and boosters
http://www.diabolicalperforman.....ctane.html


From what I've read some of these are pretty close to the stuff you pay an outrageous amount for...

But I've never used any of them and am not endorsing them in any way.

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PostPosted: Wed Mar 01, 2006 12:19 pm    Post subject:   Reply with quote

Make sure you read the link I posted. It gives a very good synopsis of just how important throwing that bottle of "octane booster" in your tank is Rolling Eyes Remember, the motor in that article was tuned for the octane that was provided to it. Just simply adding "octane booster" to your gas in an untuned engine is just like burning money.

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PostPosted: Wed Mar 01, 2006 1:55 pm    Post subject:   Reply with quote

My friend was doing yard work and needed to mix some gas for his weedeater. And didn't have any 87 octane gas to mix. All he had was some 110 octane racing gas. It worked great for about 2wks and then well let's just say he had to buy a new one. Very Happy

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