Octane?

[04HappyBus]

I'm curious.  What grade fuel does everyone run?  With a stock motor?  With mods?  Is everyone a 91+ octane user or do some go with 89 (or even 87)?  The owner's book lists 87, which seems low with a 11:1 compression ratio.

 

[BlueHaya]

87

 

[heavybusa]

87

 

[DaCol.]

(04HappyBus @ Aug. 08 2007,17:14)  The owner's book lists 87, which seems low with a 11:1 compression ratio.

Your basing this on what

? Engineering data or the Expert next door ? Remember there is alot of research that goes into an engine, and the Octane level isn't given as a "OH YEAH" after thought. I always feel the engineer who designed the engine know's alot more than me  

 

[MsMeow]

87 and I try to only buy from Shell

 

[Revolution]

87 and i find she runs better on a name brand gas like sunoco, amoco, bp, or hess.

 

[limited06busa]

87

 

[BUSAFETT]

I run 93 all the time unless I have to choose otherwise.

BF

 

[wpg2rch]

87...occasionally 89. Don't know why, don't notice any difference.

 

[xzvs]

+1000
87
run what the guys that built it recommend

 

[proud dad]

87 is the minimum recommendation..............read it right now....minimum

 

[needlepimp]

87 your just waisting money with anything higher

 

[CrashTestDanny]

My bike's placarded for 91+, so that's what I run. With more and more stations pushing the price spread between 87 and 91 to $.30, I'm beginning to envy you 87+ guys.

 

[dolilind]

Ran with about everything from 87 to VP c12. Don't run any different. But the VP has a nice smell to it .

Now just run on 87, acctually lost HP with the C12 (117 octane)

 

[Turbo-Torch]

(CrashTestDanny @ Aug. 08 2007,19:09) My bike's placarded for 91+, so that's what I run.  With more and more stations pushing the price spread between 87 and 91 to $.30, I'm beginning to envy you 87+ guys.

You have a Busa that has a tag on it stating it needs 91 octane?

 

[WuzzaCBXRider]

Stock here and I use mid grade, usually 89. No pings or rattles at any elevation. Will be running in extreme heat in a couple weeks (probably) crossing NV, UT and WY at speed on my way to CO and then over TR Rd. at 12'000'+ so I'll see how she runs then as well. In my lower comp ratio air/oil cooled CBXs, I have to run the highest octane available or they'll rattle and ping like hell when its real hot.

 

[proud dad]

(Turbo-Torch @ Aug. 08 2007,22:25)

(CrashTestDanny @ Aug. 08 2007,19:09) My bike's placarded for 91+, so that's what I run.  With more and more stations pushing the price spread between 87 and 91 to $.30, I'm beginning to envy you 87+ guys.

You have a Busa that has a tag on it stating it needs 91 octane?  

honda st1300

 

[stlbusarider]

87's all you need. Try switching it up, run 2 tanks of each grade and see what you like.

 

[TennBusa]

With the trash they're calling gas right now, I've had to move to 89. Without downshifting, I was getting a lot of pinging with even a little roll on on 87.

 

[WWJD]

mine's fully factory stock: 87 oct street and track