Does anybody on run an s with a swapped jdm motor?
If you do. do you run 91 octane?
Would octane booster help at all?

 

You can run 11.7:1 on 91 but the ecu may have to pull some timing.

Octane boost would stop detonation but remember that those boosters have less energy content then the primary compenents of gasoline, so you may not notice much difference in performance.

 

Top gear reports on octane booster

http://video.google.com/videosearch?q=5th+...er&sitesearch=#

 

That is 5th gear, but its essentially the same thing except for casting.

 

here in CA, the highest grade fuel we have at regular gas stations is 91 octane..

 

iirc those octane boosters don't even really raise octane by a whole point. Something about the way octane is calculated.

 

So its safe to run 91 octane with a jdm engine?
No octane booster needed?

 

Civic Type R FTW!!!

 

Octane booster is meant to help prevent detonation.

The higher the octane, the slower the fuel burns, therefore you can control timing more aggressively which makes more power.

On a stock ecu, the high the octane the less chess for detonation, and also less horsepower the car will make.

 

I have a JDM car, with a JDM engine.

I believe that you 91 octane is the same as our 95 RON.

There is NO WAY i'd let my car be run on 95

The minimum I put in is 97 RON (or 93 Octane), but mostly 99 RON (95 Octane?)

Still, at $11/gallon, it's not cheap, but then 95 RON is $10/gallon

I knew a guy who had a JDM EVO V. He ran it on 95 and it melted a piston.