Pump Gas Debate...

[IceDragon]

How comes these new cars like honda civics can run an 11:1 compression ratio on basic pump gas (87)... but when I am telling people I want to run an 11:1 cr on my laser, they tell me I have to run 93 octane premium gas. I know you all will say the tuning of it, but I have a fuel and timing management system to do so, and I just want to know, why would there be any detonation that could destroy my engine if properly tuned???

 

[VelocitàPaola]

I know that the Acura RSX Type-S (2.0L), which has 11:1 compression, needs to run on premium gas (~93 octane).

I can't imagine any car with a compression ratio of about 9.5:1 or higher being able to run on only 87 octane. So, just like you need 93 octane, I think everyone else with high compression does too.

 

[Quasimondo]

The only way I can see any engine with that high of a compression ratio run on 87 octane is if they set the base timing to 0*, but then that would negate the power gained by upping the compression.

Either way, I doubt you can run any engine with an 11:1 CR on 87.

 

[glenneclipsegsx]

its because u are running a turbo. do some research on how turbos work off the forums and you will understand. but ya u can put 87 in an NA stock honda that has higher compression but it wont run very well.

 

[beating4g63s]

its because u are running a turbo. do some research on how turbos work off the forums and you will understand. but ya u can put 87 in an NA stock honda that has higher compression but it wont run very well.

before you post check out his vehicle description he is 1g N/T. also is your goal to run 11:1 on 87 or something.

 

[glenneclipsegsx]

woops i seem to forget that people actually drive non turbo cars anymore. Didnt even see what forum this was. Sorry guys long day.

 

[IceDragon]

Yeah, i was going to rebuild the engine, and i found some high comp pistons for cheap, i was gonna splurg on them, but if i can't keep running 87 in it, i ain't gonna buy them becuase I have a commuter car... and 93 adds up on long trips =)

PS. my nissan 300zx turbo from 1985 runs 87 with like 7 - 9 psi boost and i believe its stock compression is like 8.5 or 9... ish haha...

 

[terminaltsi]

those high compression hondas should be using 93.... if you know someone who isn't they're just being cheap. the ecu is pulling back timing when it sees knock from 87 octane in there. you would alos have to use 93 in your high comp. motor. anything with a turbo should also be using 93 or it won't make it's maximum power.