max boost for 93 octane

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ka-t 300
Posts: 168
Joined: Thu Jul 26, 2007 2:41 pm

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How can you figuire out how much boost you can run on 93 octane. like when do you know not to increase boost any more or you will start detonating which is not good ? ! . will you start not noticing power increase before you hear detonation or what ect. ?


ka-t 300
Posts: 168
Joined: Thu Jul 26, 2007 2:41 pm

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Bump . no body knows ? also has any one ever tried using octane booster 104 or somthing like that to up your octane for detonation prevention ? does it work or is it a gimmick ?

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RideNslidE
Posts: 230
Joined: Mon Feb 12, 2007 2:38 pm
Car: 1993 240 hatch the track and a 1993 240 vert DD
Location: san diego

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there are too many factors to determine max psi for 93 oct. including compression ratio, cooling methods and outside temp, I'm sure theirs more i just cant think of any. id suggest going with water/meth injection to get your octane needs, its cheap and can get you effectively 120 octane.

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C-Kwik
Moderator
Posts: 8070
Joined: Thu Aug 01, 2002 9:28 pm
Car: 2013 Chevy Volt, 1991 Honda CRX DX

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The use of a good knock sensor is the best way to detect knock....period.

There is no simple answer. Way too many variables. Compression, A/F ratios, ignition timing, intercooling efficiency, backpressure, turbo efficiency (which varies with airflow and boost pressure), hot spots in combustion chamber as simpler examples. To put it shortly, people write big thick books about this stuff. Takes a lot of math to come up with a definitive answer (even then there are uncertainties as some variables are just assumed). For the most part, tuners tend to just bump up boost until knock is detected then back off and/or try to tune it out. Just start out easy and work your way up to it. Jumping in head first unless you know what you are doing can be risky. Given all the potential variables, the last thing you want to do is base your decisions on the opinions of others.
ka-t 300 wrote: Bump . no body knows ? also has any one ever tried using octane booster 104 or somthing like that to up your octane for detonation prevention ? does it work or is it a gimmick ?
Octane boosters do bump up octane, but by an extremely small amount. Think about it. Consider the size of the octane booster bottle. Consider the amount of fuel in your tank. Do you really think its going to bump up your octane to any significant amount for that kind of cost? I'd be surprised if you even got a bump in octane of half a point.


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