You all probably knew this I'm excited to put in 93 next time I fill. I've always been a skeptic about octane boosting power (after reading articles on it) but...

Picture is not working - http://www.vtec.net/articles/v...=8542
*Notice their dyno is 89 vs 91 while the ep3 requires 87. Imagine the jump from 87 to 93. Wheeeee!

....sorry

 

the ep3 only requires 87? Good find tho.

 

the really interesting part is that the rsx base is recommended to run 89 octane but not the ep3.

 

My old EP3 always ran better with 92+ octane. It also got slightly better gas mileage.

 

That is funny. I figured that te ep3, Fg and DC5 all took 92+

 

uh....i thought it was kind of common sense if you put in higher octane you get more out of your car hence why they use race gas drag racing...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by risktypeS &raquo;</TD></TR><TR><TD CLASS="quote">why they use race gas drag racing... </TD></TR></TABLE>
In cars tuned for race gas.

 

and they use race gas why.... because it has HIGHER octane then your standard pump gas.

100+ Octane rating (race gas)

Or you can try it yourself.. buy some race gas (it isn't cheap) and go to the track, make sure you're almost bone dry of regular pump gas because mixing race gas and regular gas doesn't quite go together. Put in race gas and see how much faster your car will run.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by risktypeS &raquo;</TD></TR><TR><TD CLASS="quote">and they use race gas why.... because it has HIGHER octane then your standard pump gas.

100+ Octane rating (race gas)

Or you can try it yourself.. buy some race gas (it isn't cheap) and go to the track, make sure you're almost bone dry of regular pump gas because mixing race gas and regular gas doesn't quite go together. Put in race gas and see how much faster your car will run. </TD></TR></TABLE>

It won't do your car any good unless you are tuned for that specific gas. Honestly, some cars don't run as well on the 92+ if they are tuned for 87.

The Ep3, however, tends to be a little more free with timing (advance) if it detects several tanks full of high octane.

 

true but there are some cars you will not have to tune and it runs good off of race gas. Not saying you don't need a tune but just saying some cars you can get away with it.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by risktypeS &raquo;</TD></TR><TR><TD CLASS="quote">true but there are some cars you will not have to tune and it runs good off of race gas. Not saying you don't need a tune but just saying some cars you can get away with it. </TD></TR></TABLE>

Maybe turbo or high-compression cars, but your average 87 octane car won't see any benefit from high octane gas at all.

 

My points exactly. That's why I was so surprised/happy that the Si actually makes a decent gain off 93.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by risktypeS &raquo;</TD></TR><TR><TD CLASS="quote">and they use race gas why.... because it has HIGHER octane then your standard pump gas.

100+ Octane rating (race gas)

Or you can try it yourself.. buy some race gas (it isn't cheap) and go to the track, make sure you're almost bone dry of regular pump gas because mixing race gas and regular gas doesn't quite go together. Put in race gas and see how much faster your car will run. </TD></TR></TABLE>

lol. how much faster did you run?

 

maybe if i could afford it i'd tell you.

if you think i am thinking it's going to add 500 hp to my car you must be smokin pole.. i know better then that but i can tell you with a higher compression car and race gas it wouldn't be bad neither.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by risktypeS &raquo;</TD></TR><TR><TD CLASS="quote">i know better then that but i can tell you with a higher compression car and race gas it wouldn't be bad neither. </TD></TR></TABLE>

I won't be a damn bit faster. Higher octane fuel is just more resistant to detination. Without raising boost and advancing timing all it will do is be safer or easier on your motors health.

 

advancing timing is the key and running higher octane fuel will allow the stock motor to gain more power. This i know and being on 11:1 compression i know it would be benificial to running race gas.

You guys are thinking off of realistics of the older series motors and how they reacted.. well when the K series came out with the whole new VTC+Vtec it changed the whole dynamics of how things can be ran.

With K series you're going to have to throw some of that older **** out and run off of theory till proven. These motors act differently then the previous series and i know you guys know this. Think outside the box.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by risktypeS &raquo;</TD></TR><TR><TD CLASS="quote">advancing timing is the key and running higher octane fuel will allow the stock motor to gain more power. This i know and being on 11:1 compression i know it would be benificial to running race gas.

You guys are thinking off of realistics of the older series motors and how they reacted.. well when the K series came out with the whole new VTC+Vtec it changed the whole dynamics of how things can be ran.

With K series you're going to have to throw some of that older **** out and run off of theory till proven. These motors act differently then the previous series and i know you guys know this. Think outside the box.</TD></TR></TABLE>

Exactly! In all reality though lower octane fuels make more power because it is more stable. But for high compression we need to run higher octane so we don't create knock.

 

93 didn't do anything. Just like I expected. Rear swaybar is sweet though!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by WhiteOnRice &raquo;</TD></TR><TR><TD CLASS="quote">93 didn't do anything. Just like I expected. Rear swaybar is sweet though! </TD></TR></TABLE>
LOL...All that for nothing...I do have a question though, since I bought my car used, I'm afraid that when the dealership gave me a complimentary tank of gas, they put in regular octane. Will that affect the performance of the car or is just one tank or regs not enough to make a difference? Reason I ask is cause I only got 21 mpg on that tank. Granted I hit Vtec a few times ...but still...Any opinions?

 

If i was you i'd run that gas out.. try to stay out of vtec maybe fill it up when it's halfway dry. It wont kill your car but don't get on it heavily.

 

I'd hope they put the right gas in.

 

lol i think i'll just save my money and get regular

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dc5tegk20 &raquo;</TD></TR><TR><TD CLASS="quote">Exactly! In all reality though lower octane fuels make more power because it is more stable. </TD></TR></TABLE>

You got that backwards -- lower octane is less stable; it burns more easily, which is why it'll knock in an engine designed for higher octane.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">But for high compression we need to run higher octane so we don't create knock.</TD></TR></TABLE>

Yup.

BTW -- the EP3 Si owner's manual says 87 octane.

 

This has been covered a million times. Octane is a fuels ability to RESIST detonation. If you have a standard street car engine that yeilds a 9:1 compression ratio and is designed for 87 octane and your throw in 110 unleaded you haven't done anything, you have probably decreased power. In FI applications or High CR NA cars higher octane is a must, because with higher CR you have more of a chance of detonating, that why you see guys with colder heat range spark plugs and premium gasoline. No benifits are to be had with this. Use what is recommened for your vehicle.