_AMG_

Put in MS109 race gas tonight, About 3 gallons worth (total drum comes in 5 gallons) mixed with CA91 octane. There was a noticeable increase in power especially up top. The AFR at full throttle was a little rich, about 12.9.
But over all the car felt strong and pulled great with the increased octane.
Im going to try to mix in a full 5 gallon drum to my gas and see how much more power the car would get.

Off topic but...I was also monitoring the Intake temp it was reading around 117 degrees at 57 degree weather while driving. But parked it was reading around 170 (I knew these engines get hot but not this hot).
My friend was recommending I go with a water/meth Injection. I dont know how well it works on N/A engines but his 997 turbo was reading around 70 degree's on his intake temp. He also claims on really hot days (90+) the most hes seen the Intake temp was around 100 degrees.
Any thoughts about Water/Meth injection on the C63? Im really considering it..

The gas is VP Racing.

jsc1234

where did u get race gas in socal?

_AMG_

My buddy with the 997 turbo hooked me up. I think he gets it from this place called Manning Fuel in Sun Valley, CA.

blindfold

Instead of messing with any sorts of injection, I would highly recommend you to look into proper ducting or a louvered hood to decrease intake temperature that way.

_AMG_

IMO meth injection is the absolute best way to cool down your engine.
A vented hood would be a nice way to dissipate heat. But what I was thinking is if somebody made air scoops to put right in back of the grill so that would direct more air through the 2 snorkels that connect to the intake.

Quadcammer

not buying it for a minute.

If your car was not detonating or pulling timing, the extra octane is useless.

the head

The fuel is oxygenated. With no detonation issues at all on my race bike it gains 4.5whp. A previous car I had gained about 20whp with the fuel and no changes to the program or boost at all. Needless to say it went way up when the boost and timing were changed. Of course, your mileage may vary...

GHAZAN

what are you using to check all this data?

CLS63 AMG

i think if you go with MS103 with your car much better then 109 !

_AMG_

How would you know?
Mixing 5 gallons of MS109 to 10 gallons of CA91 for example would produce around 95-96 octane. I was skeptical at first too but I did feel a difference in power, especially the next day.

If you don't think a higher octane makes power then go fill up your car with 87 octane.

Jons95c36amg

My AFR runs 12.9 also with 93oct gas.

GHAZAN

i didnt think 12.9 was 'rich' for these cars. Also AMG what are you using to log these data points?

_AMG_

I was using the Auterra DashDyno.

bhamg

I have verified the following on three different dyno sessions: On my M5 which had a 94 octane-optimized tune, running 91 octane gas resulted in a loss of something close to 18HP. There is a difference one can feel in throttle response through the mid/upper-midrange running the 94 octane.

GHAZAN

well that's bc you had a tune optimized for 94...not really relevant to our/his situation

bhamg

Only if this motor is tuned to a max of 91 octane, otherwise totally relevant. I suspect it's tuned in OE form well above that. Back to your drawing board now...

LZH

The ECU will advance and retard timing as it sees fit to optimize for more or less octane and the presence (or lack thereof in this case) of dieseling. To really get the most out of high octane fuel you need a tune specifically for that octane...but I have no doubt that a stock ECU will advance timing to make a bit more power.

_AMG_

+11111

austinholloman

Are there any fuel stations in LA that sell 93 oct?

bhamg

No, but the latest list of stations that carry 100 octane at the pump is here (mix with 91 octane to desired octane level). I've used four of the stations on the lis...the Alliance station on Sherman Way and the Car Wash in Long Beach used to be the cheapest of the bunch but they are all expensive now. 110 octane is available in 5 gal cans for around $75.

http://www.6speedonline.com/forums/s...where-get.html

_AMG_

Dont know any pumps that have 93 octane but there are plenty that have 100+ octane.

Here is a list of all the stations....
http://www.6speedonline.com/forums/9...locations.html

EUGENE-Taiwan

that looks like fun! I love race gas

_AMG_

Hey Eugene how you been man?

Haha Race gas FTW!!!

EUGENE-Taiwan

I have been busy as hell

but I'll be in LA on the 11th-14th for a business trip then back to taiwan for a week then off the Europe for 2 weeks.

I'll leave you a PM to see if you want to meet up

_AMG_

Sounds great man.
Have a safe trip.