I wanted to see how many (if any) of you guys are running your cars with 100 octane. I filled up the other day with it. I havent driven it much to notice any difference. There is only one place I know of in my area that sells it. It is pretty expensive (4.59 per gallon) to be exact.

 

Where in NH did you fine 100oct..are you in Loudon?

 

Nashua, Exit 6 Broad st...SUNOCO

 

i have noticed a decent amount of type-r's in and around mass.

i live outside boston and am picking up my itr this weekend. (first one stolen). any itr gatherings in NE?

 

Running a higher octane than is recommended by the manufacturer will generally not yield any performance gains, and can sometimes lead to decrease in performance. The octane rating on gasoline is directly proportional to how long the the fuel burns in each combustion cycle. Sometimes people will call low octane gasoline "quick gas" as it burns more quickly than higher octane fuel, which on high compression engines can lead to pre-ignition. Running 100 octane fuel I would imagine could lead to incomplete burn on engines that are not properly configured for it. I could be wrong on that last point, so feel free to correct me.

Nonetheless, I think it's highly doubtful you'll yield a sigificant increase in performance through use of 100 octane gasoline.

 

What AdamF said is true.

If you don't have higher compression, it won't make a difference. How high of compression is needed to see an effect with 100 octane or higher? I'm not exactly sure, I'd say at least 12.5:1 or so.

 

ITR have a high compression, 10:6:1 US / 11:1:1 AUS

ive only ever since brand new (now 20,000 KM) used Octane 98. If there was a hundred, i'd use it.

With the right engine, & i KNOW the ITR B18C is a worthy contender.

Why do you think the JDM are that little more powerful than ours. They are able to better tune their engines because they get 100+ octane piece of piss from the pump and can better tune the car knowing they have the efficient fuel to cope.

I can now see why you guys have lower compression, because i come across alot of ITR owners who use Octane 92 or lower in their ITR. You should know better than that.

Another bonus, the higher the octane, the cleaner your fuel, the more reliable and longer lasting engine will be as it wont clog up or anything because of crappy, watered down dirty dirty fuel.

Another bonus, cleaner fuel emissons.

 

That's not "high compression" imo.

[quote:64bd44c921]ive only ever since brand new (now 20,000 KM) used Octane 98. If there was a hundred, i'd use it. [/quote:64bd44c921]

There is no reason to. It is a waste of money.

[quote:64bd44c921]With the right engine, & i KNOW the ITR B18C is a worthy contender. [/quote:64bd44c921]

With 13:1 compression..

[quote:64bd44c921]Why do you think the JDM are that little more powerful than ours. They are able to better tune their engines because they get 100+ octane piece of piss from the pump and can better tune the car knowing they have the efficient fuel to cope.[/quote:64bd44c921]

I guess the different ECUs, slightly higher compression and better header have nothing to do with the 2 crank hp difference.. it must be that higher octane gas this whole time.

[quote:64bd44c921]I can now see why you guys have lower compression, because i come across alot of ITR owners who use Octane 92 or lower in their ITR. You should know better than that.[/quote:64bd44c921]

a good, clean 91 octane is fine for 10.6:1 compression. 93 is most common and is perfectly fine.

[quote:64bd44c921]Another bonus, the higher the octane, the cleaner your fuel, the more reliable and longer lasting engine will be as it wont clog up or anything because of crappy, watered down dirty dirty fuel.

Another bonus, cleaner fuel emissons.[/quote:64bd44c921]

That depends sooo much on the fuel used more than the octane. As for emissions, all 100 octane is a 10.6:1 compression USDM integra will do is kill the cat faster since it wont be burning enough fuel.

 

good points.

11:1:1 is high imo for a stock production motor.

regardless higher octane is cleaner and imo a better fuel.

if you guys had higher octane fuels readily available at a reasonable price i'm sure you all would be using it.

Regardless, fuel is a BIG reason you dont get JDM.

Quote
[I guess the different ECUs, slightly higher compression and better header have nothing to do with the 2 crank hp difference.. it must be that higher octane gas this whole time. ]

well thats why they get these better parts, because they have got Better fuel.
Fuel does not add power, I know this, if you read correctly i never said higher octane makes more power but it gives the engine more tuning capabilities with more efficient results. imo anyway.

 

Quote
[I guess the different ECUs, slightly higher compression and better header have nothing to do with the 2 crank hp difference.. it must be that higher octane gas this whole time. ]


yeah the only reason the motor's better tuned in japan is cause of the octane level difference from usdm type R's .. better gas allows them to make a healthy running motor with more compression, requiring new fuel maps (which is why u got another ecu for) and a better flowing (2.5" piping).