So i got a quick question tht a friend needs to knw , well he didnt know if he should switch to premium gas on his jdm gsr b18c , hes been using regular but someone told him tht he should be using premium but isnt sure if he needs to switch to premium instead of using regular..does anyone knw ?

 

All b18c require premium.

 

Even if its not the type r and gsr ? so even tho hes been using regular he can switch to using premium ..? will anything bad happen if he goes to premium since hes been using regular ..? & one last thing will he notice anything different from using regular and going back to premium ?

 

The car will run much better when he switches to premium. Even the GSR is recommended to use 91+

 

So true. When I bought my integra , I used 87 octane gas due to its lower pricing. But, after my dad and friend told me that I should use 91+ due to it being better for sports cars, I did so, and well, the change and feel of the car is so much better. Trust me, you will notice the difference.

 

If you love your car then you will use the car it is supposed to use.

 

*gas

 

Premium...u wanna use 87 get a d series

 

Alright cool thanks guys, ill be sure to let friend knw ,jst wasnt sure if nothing would go wrong if he switched to premium .lol

 

Only thing your friend might encounter is getting to 88mph faster. Other then that nothing bad will happen by switching over.

 

Even US "premium" (91 AKI or "(R+M)/2") isn't high enough, considering that the JDM engine was intended for 100 RON octane, which would be 95 octane here in the US.

Basically, your friend been risking pre-ignition by using the wrong fuel. He should go get it tuned for the fuel he intends to use, or run enough octane booster to get to Japan premium octane levels and run the JDM ECU.

 

premium.