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Old 11-18-2016, 11:26 AM   #1
Evendahl
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330ci Supercharger octane booster

recently bought a 330ci with a supercharger that is mapped to run on 98 octane. the problem is that i dont have 98 available in my area, I only got 95. Can i add octane booster to add octane and prevent pre ignition ? and is there any good onctane boosters on the market that can raise the octane by 3 ?
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Old 11-18-2016, 11:30 AM   #2
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Octane boosters are a scam.

Have the engine retuned for lower octane.
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Old 11-18-2016, 11:37 AM   #3
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Im going to get it retuned, i just want a temporary solution that will reduce the chances of pre ignition.

Last edited by Evendahl; 11-18-2016 at 11:38 AM.
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Old 11-18-2016, 11:51 AM   #4
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You could probably add up to a liter of ethanol or methanol whenever you fill the tank from empty. That would probably take your 95 octane up to 98, or at least closer to 98.

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Old 11-18-2016, 01:03 PM   #5
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knock sensors, just dont drive it hard. Or add some e85 to each tank
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Last edited by Pole position; 11-18-2016 at 01:04 PM.
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Old 11-18-2016, 01:09 PM   #6
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You could buy a meth injection system from AEM or Active Autowerke... but you will want to get the car tuned ASAP either way
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Old 11-18-2016, 06:28 PM   #7
Evendahl
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how much e85 per tank will I need to raise the octane from 95 to 98 ?
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Old 11-18-2016, 06:42 PM   #8
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how much e85 per tank will I need to raise the octane from 95 to 98 ?
Does Norway not have Google?
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Old 11-18-2016, 07:00 PM   #9
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Does Norway not have Google?
nope
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Old 11-18-2016, 07:19 PM   #10
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Quote:
Originally Posted by Evendahl View Post
how much e85 per tank will I need to raise the octane from 95 to 98 ?

Blend a ratio of about ~25% E85 with about ~75% 95 octane, this should give you what you want.




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Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 11-18-2016, 07:20 PM   #11
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Blend a ratio of about ~25% E85 with about ~75% 95 octane, this should give you what you want.




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ty
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Old 11-18-2016, 07:26 PM   #12
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ty
Your welcome...


What I want for the E46F community is for you to post up ALL of your results & thoughts on how well you think this works for you.

Also you shouldn't need a new tune, this will work as your new "chemical" tune.



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Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 11-18-2016, 07:27 PM   #13
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You might want to start adding some Stabil Marine, Gumout All in One, Redline Sl-1, etc, to each tank to help counteract the negative effects of the ethanol.

http://www.fuel-testers.com/list_e10_engine_damage.html
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Old 11-18-2016, 07:28 PM   #14
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^ Good call.



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Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 11-18-2016, 07:28 PM   #15
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330ci Supercharger octane booster

Quote:
Originally Posted by Evendahl View Post
how much e85 per tank will I need to raise the octane from 95 to 98 ?

E85 is about 105 octane, although it's stoichiometric value is closer to 10.1 (opposed to 14.7). I can get my books out if you want exact numbers, but probably around 3-4 gallons. You start risking lean conditions if you use much more.

Edit: dang, Rob43 the race car driver beat me to the line, and with more information too!
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Old 11-18-2016, 07:35 PM   #16
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Originally Posted by BKMrSteel View Post
E85 is about 105 octane, although it's stoichiometric value is closer to 10.1 (opposed to 14.7). I can get my books out if you want exact numbers, but probably around 3-4 gallons. You start risking lean conditions if you use much more.

Edit: dang, Rob43 the race car driver beat me to the line, and with more information too!

Certainly your contribution is also excellent.

Based on what I said plus what you said, I'd estimate roughly 97.5 octane (~93 USA) once mixed.



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Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.

Last edited by Rob43; 11-18-2016 at 07:36 PM.
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Old 11-18-2016, 07:45 PM   #17
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appreciate it
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Old 11-18-2016, 07:55 PM   #18
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appreciate it

Again, when you get results... give back to the E46F community.




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"Chance Favors The Prepared Mind"

I BUILD SUSPENSIONS (Consult) FROM MILD TO WILD FOR RWD & Xi E46's
Quote:
Originally Posted by RacerX View Post
Nitrous is a little trickier than boost, but it's not the spray that kills motors, it's STUPIDITY!!
I Know How To Fix The Rear "Bouncing" Problem On Your Cheap Coilovers Like: Jom RL FK SE & RK.
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Old 11-18-2016, 08:11 PM   #19
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Now I have alternative fuels on the mind, perfect for a young male on a Friday evening haha. How much Everclear do we think it would take? Might cost the same too haha
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Old 11-18-2016, 08:14 PM   #20
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Now I have alternative fuels on the mind, perfect for a young male on a Friday evening haha. How much Everclear do we think it would take? Might cost the same too haha
That's what I want to know, more or less. I wonder how much denatured alcohol would have the desired effect, if added to the 95 octane gasoline.
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