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Premium Member
06 AWD SS
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Discussion Starter #1
A friend of mine with a GTO puts premium in his car religiously and is convinced that putting an octane boost or fuel injector cleaner in his tank every so often is keeping the fuel system clean. My point is that if he always puts premium in is there really a need to clean it and isn't he kind of wasting his money?


Just curious because he has the same motor as us and if it actually does help maybe I'll start doing it.
 

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Everything I work on
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The fuel can be very clean but then it's transported in a tanker and it gets contaminated. It then is pumped into a gas station holding tank where it becomes contaminated further. Then it's pumped out, through lines, through a pump, and it becomes contaminated further still.

In short, gas is dirty when you get it.

Your friends logic will create problems down the road. Fuel injection cleaner and Octane boosters deteriorate and eat rubber, some plastics, etc. This is why they should be used sparingly. One should also change the fuel filter any time fuel injection cleaner or octane boosters are used. Octane boosters are proven to do...............a lot of nothing in the way of performance.
 

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TrailblazerSS
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I try to use fuel injector cleaner once every 2 months, Didn't think it would hurt anything! I have never put regular fuel in my tbss just premium 91 or better.
 

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'06 AWD
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I knew this about booster and cleaner...but marvel really how much per tank?

Ma'am have you ever seen a cat skeleton in a tree? Exactly it will come down.
 

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Willy M'Fn Wonka
07 Trailblazer SS
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I use this one:

 

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I knew this about booster and cleaner...but marvel really how much per tank?
Depends on size of tank. A car with an average sized tank of 12-14 gallons a pint will suffice............but a quart won't hurt a thing (upon fill up). A truck with 20+ gallon tanks should use a full quart at fill up.

Marvel is part solvent and part lubricant. It is easily burned in the cylinder without smoke (unlike seafoam). The solvent breaks down carbon and other contaminates. When used in the fuel system it breaks down the carbon build up on top of valves and on top of pistons. The lubrication prevents carbon from sticking to the valves and to the tops of pistons. It also lubricates the pintle in the fuel injector for smoother and quieter operation. Also, the solvent does it's job gradually and doesn't attack debris like fuel injection cleaners do. FI cleaners break down deposits to an average of 2 microns. While that all fine and good, our fuel filters only trap debris as small as 5-10 microns. Once the FI cleaner hits the filter, it attacks what's in it and now we have a mass quantity rush of 2 micron deposits charging the fuel rail and injectors. The injectors will pass the deposits right into the cylinder, where they accumulate as carbon build up.

Remove the cylinder head from a religiously used FI cleaner engine and the injector and air flow patterns are clearly written on top of the pistons. Everywhere the fuel/air hit directly, it's clean and the rest is carbon. Remove the cylinder head from a religiously used MMO engine and the "clean" is everywhere and evenly distributed.
 

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TBSS 3SS
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Interesting information about this subject.

100 OCTANE RACING GASOLINE VS. OCTANE BOOSTERS
Why Should I Buy High Octane Gasoline When I Can Buy Octane Boosters?

http://www.whitfieldoil.com/www/docs/171.277/vp-racing-fuel-

I'm going to try out a half tank of 100 octane and see if my butt dyno notices anything.
 

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TrailblazerSS
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Billy, are you saying to use MMO at every tank fillup?
What do you think of Seafoam?
 

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secret squirrel
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while Billyman speaks the truth, there are major differences between 'fuels'....

Chevron has a different anti knock/cleaner package than 76 or Mobil.

most cheaper fuel stations like USA,Valero, and the like, dont put a anti knock package equivilent or a cleaning agent in their fuels. these places use a "base" fuel, add a minimal package for detonation, and ship it out depending on it knock index.

adding 100 oct to your fuel of 1/2 tank of 91 will give you minimal gains unless you tune for the added 100 oct. tune it to be a little more lean and add some timing IF you use the 100 oct. otherwise, you will lose some performance by just ADDING 100 oct. without a tune. especially if your boosted.....if you add some 100oct, you help with detonation and you may feel a difference with higher boost.

my grandfather used to work at the 76 refinery here locally and explained some of the processes of the 76 fuel. my best friend is currently in India working for Neighbors International ...a major oil drilling company. :cheers1:


i use Marvel in my old pickup truck and i use Lucas Oil fuel treatment in the SS, Evolution, and the IS300.
 

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Premium Member
'06 AWD
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Thanks Billy makes sense.
Ma'am have you ever seen a cat skeleton in a tree? Exactly it will come down.
 

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Hooked on speed
06 Trailblazer SS
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Good explanation Billy.
 

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2007 TBSS AWD
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adding 100 oct to your fuel of 1/2 tank of 91 will give you minimal gains unless you tune for the added 100 oct. tune it to be a little more lean and add some timing IF you use the 100 oct. otherwise, you will lose some performance by just ADDING 100 oct. without a tune. especially if your boosted.....if you add some 100oct, you help with detonation and you may feel a difference with higher boost.
What if the 100 octane you are using has a stoich point of 13.7:1?
 

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secret squirrel
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What if the 100 octane you are using has a stoich point of 13.7:1?
then it wouldnt need a tune....but then what would be the benefit?? higher octane helps to prevent detonation at higher compression ratios and higher boost applications. higher octane isnt a magic potion to make more power without making other changes....

in the explained application of .50 tank of 91oct and .50 tank of 100oct would help with detonation IF he/she had any. that would have to be determined on a dyno with a wideband to see what his/her stoich point actually is to reap the benefits of the higher octane. why leave power on the table with higher octane in the tank?? tune for it.....you know that......:cheers1:
 

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2007 TBSS AWD
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then it wouldnt need a tune....but then what would be the benefit?? higher octane helps to prevent detonation at higher compression ratios and higher boost applications. higher octane isnt a magic potion to make more power without making other changes....

in the explained application of .50 tank of 91oct and .50 tank of 100oct would help with detonation IF he/she had any. that would have to be determined on a dyno with a wideband to see what his/her stoich point actually is to reap the benefits of the higher octane. why leave power on the table with higher octane in the tank?? tune for it.....you know that......:cheers1:
Yes I know. The point I was making is that you don't just make the tune leaner because you are running 100 octane. In certain cases you need to richen up the tune on race gas.
 

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secret squirrel
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Yes I know. The point I was making is that you don't just make the tune leaner because you are running 100 octane. In certain cases you need to richen up the tune on race gas.
no problems Matt. i understood what you were debating about the stoich point. however, IN MOST CASES, people put the 'magic potion' of 100 oct in thinking it will make MORE power.....it eventually will because it will help with detonation and make a smoother power curve, thus, a 'magic potion'.....hehehehe:boff:...beer sir??:burp:
 

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no problems Matt. i understood what you were debating about the stoich point. however, IN MOST CASES, people put the 'magic potion' of 100 oct in thinking it will make MORE power.....it eventually will because it will help with detonation and make a smoother power curve, thus, a 'magic potion'.....hehehehe:boff:...beer sir??:burp:
I like to run the lowest octane I can get away with while making the most of the combo:)
 

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secret squirrel
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I like to run the lowest octane I can get away with while making the most of the combo:)
like a autoshop instructor once said "use the lowest octane fuel you can, just before detonation''

:cheers1::coolthumb:
 
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