why does my car run WORSE on high octane

i tried switching from 87 to 91 octane and it made my car run like crap. its less powerful and less responsive. this is the second time i have tried this, from two different brands of gas. my car is a very healthy 89 crx dx. any ideas???
 

B16

Super Moderator
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higher octane gas is actually harder to ignite, which is why it works well in high compression motors. the heat from high compression motors will not detonate the air/fuel mixture. what motor are you running?
 
Hi.
 
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