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      01-25-2009, 09:51 PM   #1
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Racing Fuel (100 octane) in 335i

Guys,

Is it ok to put 100 octane fuel in 335 once in a while if i want to have more power/fun? I am really curious how it will behave running 100 octane... fyi mine is stock...

any infor will be appreciated...

Thanks
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      01-25-2009, 09:52 PM   #2
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      01-25-2009, 09:55 PM   #3
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your car will enjoy it! if you really want more power just get a JB3/V3
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      01-25-2009, 10:08 PM   #4
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      01-25-2009, 10:37 PM   #5
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If you have no way of increasing boost or timing, nothing different will happen.
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      01-25-2009, 10:40 PM   #6
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Quote:
Originally Posted by clickclickboom View Post
If you have no way of increasing boost or timing, nothing different will happen.
Using higher octane gas than the car is designed for will not harm anything but it will not give you a performance advantage.

CA
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      01-26-2009, 04:33 AM   #7
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if you want more power buy M3! dont mess with octane numbers.
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      01-26-2009, 05:07 AM   #8
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Quote:
Originally Posted by captainaudio View Post
Using higher octane gas than the car is designed for will not harm anything but it will not give you a performance advantage.

CA
+1 agree, no gains.
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      01-26-2009, 09:17 AM   #9
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      01-26-2009, 02:47 PM   #10
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It does nothing. Get a book on turbo charging. It will answer a lot of these questions. Everytime you change boost you have to alter fuel enrichment, engine timing and cooling of the engine. I all you do is one of the 3 it doesn't give you anything helpful. The car must be programed for it.
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      01-26-2009, 02:50 PM   #11
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Quote:
Originally Posted by Deda View Post
if you want more power buy M3! dont mess with octane numbers.
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      01-26-2009, 02:50 PM   #12
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Make sure it's unleaded.
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      01-26-2009, 05:08 PM   #13
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It won't hurt your engine and will give you a little more power. If you are stock, then it won't be much, but the ecu should add a little timing especially at high rpms. 100 octane gave me about .5 mph in my 1/4 mi runs.
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      01-26-2009, 05:14 PM   #14
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Make sure it's unleaded.
This is the only rule that you should follow.
I will be running 105 this Friday and it won't hurt anything.
Leaded gas will destroy your cats!!
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      01-26-2009, 05:16 PM   #15
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Quote:
Originally Posted by Mr. 5 View Post
This is the only rule that you should follow.
I will be running 105 this Friday and it won't hurt anything.
Leaded gas will destroy your cats!!
Some tuners say a diluted mix of leaded is ok. 50/50 at least, not that I'm willing to try it.
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      01-26-2009, 05:29 PM   #16
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more concerned about your o2 sensors w/ the leaded fuel.

I have no cats.
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      01-26-2009, 06:06 PM   #17
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Quote:
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more concerned about your o2 sensors w/ the leaded fuel.

I have no cats.
It will take some time before the 02 sensors go, but the cats is a for sure deal.

Quote:
Originally Posted by GeorgiaTech335coupe View Post
Some tuners say a diluted mix of leaded is ok. 50/50 at least, not that I'm willing to try it.
Yeesh. Yah, you can try it. I wouldn't trust leadded fuel with any sort of cat.
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      01-26-2009, 06:07 PM   #18
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I say even with a Dinan tune it doesn't give you that much help. Procede and others actually have a seperate map for running race fuel. Those maps get the very most out of the race fuel with timing, fuel delivery and engine cooling.
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      09-11-2011, 08:19 AM   #19
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old thread, but since its been a while, this causes no harm at all? but really only helps w a tune?

is it good to run once in a while to "clean" the car a little? or am i just making crap up?

thanks guys
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      09-11-2011, 10:01 AM   #20
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it wont "clean" anything so much, but it will make the ecu adjust

this will take time, but will reflect in your mpg

this will also revert (in time) when you change back to your regular octane value

the power gains are real, but minimal. and this depends greatly on the condition of the engine and exhaust on the whole

but , id do it
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      09-11-2011, 10:08 AM   #21
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Putting race gas on a stock car will give minimal gains, but adding race gas to a modded car will give you the results you are looking for
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      09-11-2011, 10:20 AM   #22
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Quote:
Originally Posted by ducati955 View Post
old thread, but since its been a while, this causes no harm at all? but really only helps w a tune?

is it good to run once in a while to "clean" the car a little? or am i just making crap up?

thanks guys
A waste of money unless you are increasing boost. BMW designed these engines to run on 91oct with peak performance on 93oct with the stock tune. Anything above 93 and you might pick up 5hp with better timing. If you want to clean the fuel system a little just throw in some Techron or BG 44k in the fuel tank.
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