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Discussion Starter #1
I have a B18C1, 94 integra, I was wondering what the engine is designed to use, for gasoline, I have been putting 91octane in it since i bought it. Recently, my mom used my car and put 87 octane gas in it, and it didn't seem like it was as smooth or as powerful. What is recommend for gas? I heard that 91 octane can be harmful to the engine if it is not designed to use it.


Also would removing my Cat and resonator on the exhast clear things up and increase power? with stock muffler, or with a Apexi N1 muffler?
 

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it's supposed to run on 91 I believe(I have a ls so I'm not positive).
 

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Discussion Starter #3
I have an LS nonvtec also.

Does anyone know for sure? will 91 octane cause any harm?
 

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in that case you have a b18b1. the b18c1 is the vtec gsr engine. the b18b engine doesnt need 91 octane 87 octane is fine. no running 91 wont harm the engine any.

click me

engine info
 

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GSR and Type R engine are the only ones that require premium fuel. however, if you've been putting 91+ octane gas in your car already... you shouldn't really go back to 87 or even 89. That would explain your knocking and power loss. Some people say that premium is a waste on LS's, but it won't hurt it. Just remember, stick to one or the other, don't mix.
 

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I noticed that is ran somewhat smoother and there was a nicer kick if i let it gradually climb to 5Krpm then nail it in 2nd.... pulls a bit stronger.

How much is it recommend to advance the timing, and does that increase the power, pros/cons?
 

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There shouldn't be a problem going from 91 to 87 again on a B18B.

If you are having knocking problems with 87 gas, there is something else causing a problem.
 

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Discussion Starter #8
Define knocking, I am pretty sure it isn't knocking.

To what degree is it recommended to advance the timing? And what is stock?
 

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knocking sounds like someone knocking on a wood door, coming from your engine.

Stock is 16, if you want to advance it most people will say 18 is the best bet.
 
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