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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Powertrain and Drivetrain Discussions > N54 Turbo Engine / Drivetrain / Exhaust Modifications - 335i > question about higher octane gas?



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      03-09-2007, 06:39 PM   #23
DrM
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I agree. Shiv has said that the BMW ECU can take advantage of up to 93 octane without a special map. The additional octane allows the ECU to change the timing without causing knocking. However, if the car is only programmed to use up to 93 octane, 100 octane will have little effect.

I am not saying 100 octane won't help other cars. Their ECUs might have more aggressive maps that allow them to take advantage of the higher octane. They may be relying upon the knock sensor to pull timing based on the fuel. Just because some other car benefited from 100 octane means nothing to the 335. Unless you have tested a 335 on a dyno with 93 octane and 100 octane, you can't say for certain.

I am simply saying that based on Shiv's comments the 335 won't benefit much from gas above 93 octane, unless you are using the PROcede and load a 100 octane map.
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      03-09-2007, 07:34 PM   #24
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Quote:
Originally Posted by bmwzimmer View Post
CEA, you'll need more than 1-2 gallons to make 93. Use this link below to see how much you need.

http://www.motorsportsracingfuels.co...alculator.html
dude that calculator SUCKS .... i put in 91 and 100 mix to get 16 GAL of mixed gas and it told me i need to use a negitive number of low 91 oct gas.... POS :mad:
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      03-09-2007, 07:38 PM   #25
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how much is 100 octane in our area now anyways? last time i checked it was up to about $5.25 a gallon!
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      03-15-2007, 12:52 AM   #26
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Quote:
Originally Posted by IrishFlush03 View Post
I live in Maryland and we only have 93, 89, and 87 ... I wish we had 100 cus gas is only like 2.50 a gallon for 93...
its 8.99 per gallon at the 76 here in laguna area for 100 octane.....yea i know...pshh
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      03-15-2007, 01:10 AM   #27
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Quote:
Originally Posted by ///M_owns_you View Post
its 8.99 per gallon at the 76 here in laguna area for 100 octane.....yea i know...pshh
damn yo, that place is a rip... i get 100 octane for cheap.

shit i dont even pay that much for c16
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      03-16-2007, 01:02 AM   #28
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"Race gas" can come in many different forms...
100 octance from a Sonoco pump won't hurt your car, it will hurt your wallet though. However a fuel such as C16 is a different story. C16 is a leaded fuel which tends to foul O2 sensors.
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      03-16-2007, 01:05 AM   #29
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Quote:
Originally Posted by merritt View Post
"Race gas" can come in many different forms...
100 octance from a Sonoco pump won't hurt your car, it will hurt your wallet though. However a fuel such as C16 is a different story. C16 is a leaded fuel which tends to foul O2 sensors.
not only that it will clogg up your cats.

C16 is really only for cars running really high boost and basicly running lean as shit!

but yea, there are so many different types of race gas its crazy.
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