CLK-Class (W208) 1998-2002: CLK 200, CLK 230K, CLK 320, CLK 430 [Coupes & Cabriolets]

100 Octane

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Old May 12, 2009 | 08:20 PM
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From: Hotlanta
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100 Octane

Has anyone here run 100 in their W208? If so....anyone know where to find it in Atlanta Area? Do you see/feel any increase or is it something you'd have to tune the ECU to reap any benefit?
Thanks,
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Old May 13, 2009 | 01:07 PM
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higher octane will allow more timing advance. On a stock 430 with no ecu flash you would have no benefit over recommended fuel. Even with the flash I doubt you would notice the difference with the 100 over say 93. You'd need heavy mods to justify the hassle and expense of 100.
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Old May 13, 2009 | 07:24 PM
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You can buy it at the Shell station at Crabapple Rd. and Birmingham Highway in North Fulton.

You won't see any performance increase unless you're highly modded. My CLK had no performance benefit at the drags on that gas.
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Old May 13, 2009 | 11:42 PM
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Major Night and Day difference between 93 and 100 in a CLK320. The number 1 ranked High Octane Gas in Japan is provided by Eneos Gas Station. It burns so quickly you will soon find yourself on "E"

The only thing you can get on a military installation is 93 at around $2, no other options. So I end up paying around $7 a gallon for the 100 High Octane Gas.

Last edited by Williams707; May 13, 2009 at 11:45 PM.
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Old May 14, 2009 | 01:24 PM
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Originally Posted by Chappy
You can buy it at the Shell station at Crabapple Rd. and Birmingham Highway in North Fulton.

You won't see any performance increase unless you're highly modded. My CLK had no performance benefit at the drags on that gas.
Hey Chappy, won't the ECU adjust itself over time from running the higher octane repeatedly?
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Old May 14, 2009 | 01:26 PM
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Originally Posted by MMM430
Has anyone here run 100 in their W208? If so....anyone know where to find it in Atlanta Area? Do you see/feel any increase or is it something you'd have to tune the ECU to reap any benefit?
Thanks,
Don't forget that 100 Octane does contain Lead and that will kill your factory cats over time.

Last edited by Ghostrider; May 14, 2009 at 01:30 PM.
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Old May 14, 2009 | 01:27 PM
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Originally Posted by Ghostrider
Don't forget that 100 Octane has lead and that will kill your factory cats over time.
This is 100 unleaded.
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Old May 14, 2009 | 01:39 PM
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Originally Posted by Ghostrider
Hey Chappy, won't the ECU adjust itself over time from running the higher octane repeatedly?
Maybe....I drove around for 4 days and ran 30 gallons of 100 Unleaded through it.

Then, I went to the drags. My times were worse....go figure.
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Old May 14, 2009 | 01:40 PM
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Originally Posted by Chappy
This is 100 unleaded.
Copy, roger that!!

It must be so cool to be able to get 100 Octane...
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Old May 14, 2009 | 01:41 PM
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Originally Posted by Ghostrider
It must be so cool to be able to get 100 Octane...
I think it now runs $8 or $9 bucks a gallon.
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Old May 14, 2009 | 01:42 PM
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Originally Posted by Chappy
Maybe....I drove around for 4 days and ran 30 gallons of 100 Unleaded through it.

Then, I went to the drags. My times were worse....go figure.
Did you remember to do the Sneaky ECU Reset before you filled up with that first tank of fuel??
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Old May 14, 2009 | 01:55 PM
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Originally Posted by Ghostrider
Did you remember to do the Sneaky ECU Reset before you filled up with that first tank of fuel??
lol....every trick in the book brah....

I dropped $150+ in expensive fuel (at the time it was $6/gallon when 93 went for $2/gallon). Never helped a lick performance-wise, except it turned my exhaust tips a little blue.
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Old May 15, 2009 | 01:28 PM
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Unless the timing is adjusted for that octane, theoretically it shouldn’t make better performance; actually it should make the performance worse since the burning time and the sparks are out of sequence. But that theoretically…
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Old May 15, 2009 | 01:40 PM
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Originally Posted by Chappy
lol....every trick in the book brah....

I dropped $150+ in expensive fuel (at the time it was $6/gallon when 93 went for $2/gallon). Never helped a lick performance-wise, except it turned my exhaust tips a little blue.
didn't the exhaust smell sweet like candy also?

Originally Posted by kyxapka
Unless the timing is adjusted for that octane, theoretically it shouldn’t make better performance; actually it should make the performance worse since the burning time and the sparks are out of sequence. But that theoretically…
our ECUs adjust automatically? aren't they using 100+ in europe?
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Old May 15, 2009 | 03:31 PM
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Originally Posted by sfclk
. . . . . . . aren't they using 100+ in europe?
The reason European fuel has a higher octane rating is they use a different formula. Here in the US this is the following formula:
(RON + MON) / 2

In most places around the world (including Europe and Australia), the Research Octane Number (RON) is what’s posted on the pump. There is a second rating called the Motor Octane Number. Both numbers are determined using a variable compression engine, but the MON uses heated fuel, the engine is run at a higher RPM, and the ignition timing is adjusted during the test. The MON is always eight to ten points lower than the RON.

This means the exact same 98 octane gallon of UK fuel, is rated at 93 or 94 octane in the U.S. 100+? I suppose it's available, but I've never sought high octane fuel overseas. My rentals get the cheap stuff
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Old May 15, 2009 | 03:56 PM
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Take a look...

http://www.europeancarweb.com/tech/0...ted/index.html
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Old May 15, 2009 | 04:01 PM
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Originally Posted by MarcusF
I suppose it's available, but I've never sought high octane fuel overseas. My rentals get the cheap stuff
I'm sure they don't appreciate this little fact when you bring back that Lambo!!
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Old May 15, 2009 | 05:31 PM
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Originally Posted by sfclk
our ECUs adjust automatically? aren't they using 100+ in europe?
It is my understanding that it will adjust to the certain degree within the specified range; otherwise we could easily use 87 the same way we think that it’ll adjust for 100.
And MarcusF is correct – US number is lower by around 4 points. So our 93 equals to European 97-98.
By the way, lower octane has higher power and burns longer. And higher octane has more controllable burn (something like that). It is my understanding that it’s better to control at the higher RPM, which we don’t use in the daily driving were we need more power at the lower rpm (think stop and go traffic)
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Old May 16, 2009 | 01:33 PM
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Your ECU will not "adjust" to make more power from higher octane. If you search my posts you'll see that when I was more active on here, I was always looking for ways to make more power. If it was as simple as just upping the octane I would have been running it all the time.

unless you're running a different tune that takes higher octane into account, or unless you're running forced induction with high boost and need to control detonation, you won't see any benefit from 100 octane. If anything, your car will run slower as higher octane fuel combusts at a slower rate.

Use the recommended octane for a stock car. Nothing more, nothing less.
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Old May 16, 2009 | 08:53 PM
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Higher octane does help the ECU run at its maximum potential so in that regard it does help smoothen out the power band because it prevents any detonation hence the ECU is just allowed to operate at 100% (most of the time your car is only running at 95% or less, this just enables your ECU to advance timing all the way), but you won't pickup 10HP or anything like that unless you have your ECU tuned for it. It makes much bigger difference on FI cars vs. NA ones.

The easiest solution is simply getting Toluene, its 114 octane unleaded race gas, you can pick it up at most paint stores in one gallon jugs for $10-13 (sherman williams & etc). You can get it in 5 tanks or 55 gallon drums as well (although its a bit overkill). You only need to run a few gallons to get the effects; honestly anything over 96-97 octane isn't going to really do anything extra. Its totally 100% safe and is already in the gas at the pump (just in smaller quantities obviously). It is not recommended in concentrations higher than 40% (so just add 2 gallons to a full tank, or 1 gallon per half tank, and that's all you need really).
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Old May 16, 2009 | 09:06 PM
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I rotate 93 & 100 Octane fuel every 2-3 weeks and even just yesterday I filled up with Eneos 100 High Octane. I get way better performance with Eneos' 100 Octane in my 320 which really throws me back in my seat. All this talk about it should be slower is "Not The Case" with me.


The ENEOS NEW Vigo high-octane gasoline. I think it is only sold in UK and Japan. I think they tried to market it in the US and was rejected.

http://www.eneos.co.jp/company/rd/in...inne_vigo.html

Sorry you will have to use Google Translation or another Translation site
Japanese - English

Summary:
ENEOS NEW Vigo, a sulfur-free high-octane gasoline that the Company began supplying in January 2005, addresses environmental problems with its sulfur-free guarantee by improving fuel and acceleration efficiency by adding a friction modifier, and by providing the leading engine-cleaning capability in the Japanese market. By adding a new high-performance cleaning agent, we advanced the cleaning capability that the previous ENEOS Vigo possessed. The cleaning agent cleans the inside of the engine, and can reduce air intake valve grime by as much as 86%. This in turn reduces the regulated exhaust emission components (carbon monoxide, hydrocarbons, nitrogen oxide) by 10-30%. As it contains a friction modifier (the only such product in Japan), fuel consumption is improved (CO2 emission is reduced) by 3%, and acceleration is improved by up to 5%.

Hence the fact that this is the #1 Rated Gas in Japan for several years.

http://www.cdproject.net/responses/p..._CDP6_2008.asp

I don't have any performance mods except for the Supersprint exhaust from mid~back.

Last edited by Williams707; May 16, 2009 at 09:14 PM.
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Old May 17, 2009 | 03:14 AM
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octane is octane, brand makes very little difference. The only big distinguishing factor is leaded or unleaded. There are many ways to get that higher octane, but they all relatively do the same thing (better detonation prevention). Toluene you can use up to 40%, alcohols only up to 10%, & etc.

ENEOS Sales pitch aside, just make sure its unleaded and not alcohol based and you should be fine. Toluene or Xylene will do the job although Toluene seems to work better IMO, xylene is technically 117 but for some reason the effects were not as pronounced. hope that helps.
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Old May 19, 2009 | 04:06 PM
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haters crazy
Some race fuels are also oxygenated
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Old May 19, 2009 | 08:41 PM
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Originally Posted by AMS Performance

The easiest solution is simply getting Toluene, its 114 octane unleaded race gas, you can pick it up at most paint stores in one gallon jugs for $10-13 (sherman williams & etc). You can get it in 5 tanks or 55 gallon drums as well (although its a bit overkill). You only need to run a few gallons to get the effects; honestly anything over 96-97 octane isn't going to really do anything extra. Its totally 100% safe and is already in the gas at the pump (just in smaller quantities obviously). It is not recommended in concentrations higher than 40% (so just add 2 gallons to a full tank, or 1 gallon per half tank, and that's all you need really).
has anyone here actually tried that? i've heard of this being done...
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Old May 20, 2009 | 01:41 AM
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Originally Posted by AMS Performance
octane is octane, brand makes very little difference. The only big distinguishing factor is leaded or unleaded. There are many ways to get that higher octane, but they all relatively do the same thing (better detonation prevention). Toluene you can use up to 40%, alcohols only up to 10%, & etc.

ENEOS Sales pitch aside, just make sure its unleaded and not alcohol based and you should be fine. Toluene or Xylene will do the job although Toluene seems to work better IMO, xylene is technically 117 but for some reason the effects were not as pronounced. hope that helps.

With Obama wanting to increase fuel efficiency maybe the Eneos Vigo Gas will get lucky enough to make it to the United States. Then you will be able to test and feel the difference.

Months ago I told my friend who street races his mod'd 1JZ here in Japan to use the Eneos Vigo gas instead; I followed up and asked him the other day if he made the transition over to Eneos Vigo Gas and if he has noticed better performance. In short he said yes and from now on it will be the only gas he uses.

So here you have it

2 People - Tested and Approved
1 Person - Untested, No Factual Data, Unapproved

I tend to lean towards Benchmarks and not White Papers. You decide

The only Eneos Vigo statement I disagree with is the wording of where it states that "fuel consumption is improved (CO2 emission is reduced) by 3%". What I have noticed is a 3% increase in fuel consumption. I would not call an increase of frequently filling my tank improvement.

"Octane is Octane" evidently is not true seeing that I and my friend have tested both types of High Octane gas. I guess someone has failed to read where it states that Eneos has special additional additives which gives a 5% increase in power. The rational is the same difference as adding Toluene to your current tank of gas. Duh~ Now I see why your statements are often corrected by other forum members.

"ENEOS Sales pitch" HA you make me laugh.

Last edited by Williams707; May 20, 2009 at 01:43 AM.
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