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I have a question on any JDM engine. Currently I am having installed a ITR (B18C) engine in my 99 civic EX. My question is this. Since Japan runs on 100 octane for their high compression engines and California's highest rated octane is 91, how will my engine react to 91 octane. Will it be fine? Will it detonate? Will the knock sensor retard the timing soo much that the car is barely driveable to the fact that I cant rev too high or I risk blowing up the engine due to detonation? I can add octane boost but the most it will do is add one to two points to the rating. Should I be concerned or will it be ok. Any comments will be greatly appreciated. Thanks
 

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TeG01 said:
yup, 91 is ok. The Rsx TypeS has an 11:1 compression like the jdm itr motor.
You need to consider that the KA20 is a different engine with different engine management with i-VTEC for more control over intake and exhaust events. One of my friends has a JDM H22 with 10.6:1 (USDM is 10.1:1) and it runs fine in 110 degree heat.

I think it's fine as long as it's not a 400 degree day outside, and the quality of the fuel is good. 76, Chevron and Shell sell very high quality gasoline, and if you're still not sure, put some octane booster in every tank.
 
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