i jus wanted to know if it will be safe to us 89 octane in my gsr?its on a stock ecu and not on much mods i jus need 89 for commuting pls help me out

 

No

 

yes provided the car isn't ran under load or on a really hot day with ignition timing at 18btdc. in the heat or with more ignition timing you will get knocking. freeway driving? no big deal. still when you add up the cost of 91 at only a dime more a gallon that's roughly one dollar per fill up.

 

your not suppose to...but my friend use to use 87 in his gsr and it ran coo...but that car was a pos

 

This has been covered before.

The bottom line is that it will not hurt a stock vehicle.

The caveate is that 89 octane will result in lower fuel economy, which means that you don't actually save money.

It is in your best interest to run 91 like the manual says.

 

^ ditto.
and you dont get all that awesome bleach that you get in the 91..

 

91 whats that? i use 93 octane

 

thats koo we dont have 93 or i would use it

 

i use 93 too.

 

93? i use e85

 

hope it's boosted or running 12:1 +

e85 has less bang ounce for ounce than regular gas, it's higher octane is wonderful if you tune for it, you just consume more & need a map that supports it

 

Are you doing this in attempt to save money?

 

boosted indeed does wonders for numbers on dyno especially with torque. its pretty much race gas and over here its a dollar cheaper then regular

 

is and isn't ethanol has great octane numbers but requires more of it versus petro fuel to create the same thermal energy. this is why you will make less power on e85 if you dump it in something like a stock GSR. now if that gsr has 12:1 pistons and you tune it for e85 and it's higher octane, oh hell yea, you can run WAY more timing thus kicking the snot out of regular gas.

 

93 unleaded premium > all

 

I only use 93. It is extremely hard to find 91 in NY.

 

u will get crappy mpg the low octane u go
im using bp ultimate 97 octane in my gsr
im getting about 34mpg

 

 

if you can't afford the proper gas then you can't afford the car. sell it and buy a sohc civic.

 

it says premium unleaded on the cluster.

 

Which is 89 octane.

87 is low grade, 89 is premium, 91 is supreme.

Also keep in mind that different place rate the same octane differently. RON, MON, and AKI can be used for an octane rating, and do not match each other (in terms of the number listed).

That said, my GSR only gets 91. I've actually set off the knock sensor with 91 on a 105* day, and had to add half a tank of 105 to prevent it from happening the rest of the day. This was on track though, and running for 45 minutes above 6k RPM isn't exactly kind on the engine.

 

In most locations, premium is 91 octane and midgrade is 89.

 

95 octance in uk is like 91 in the states

 

Greetings, UK.

I think Japan has RON 100 for premium. I was talking about US octane before.

 

i tested regular unleaded vs 91 premuim the differents are vtec kick-in harder and faster with the premuim gas.