SI with 87 octane gas *Threads merged*

[OrdnanceMarine]

Originally Posted by EzK

Verification



I run it hard, so I stick with premium.

That's interesting. The sticker is even a different font, shape and size than mine. Looking at the Honda website it still says "Required Fuel: Premium Unleaded. Moving over to the Acura website I notice that the TSX says, "Gasoline with an octane number lower than 91 may be used, with reduced performance. Use of a gasoline with a pump octane number less than 87 can lead to engine damage." while the RL/TL/MDX/RDX all say, "Using gasoline with an octane lower than 91 octane may cause damage to the engine. Please consult the owner's manual for details."

[EzK]

Very strange. The owners manual still says don't use under 91 or damage can occur.

[SGTfr0sty]

*sigh* just put 91/93 in your SI... it's not that difficult. Only in emergencies should you use anything else. It says it in the manual, on the fuel door, ask Honda they will tell you the same blah blah blah.

Quit being cheap and risking your K20 motor. If you wanted to use cheaper gas, you shoulda bought an EX, LX, DX. You paid extra for the added performance of an SI, so by default you have signed on to pay for premium gas. Jeez

[GalaxSIGray]

I felt cheap and ran 89 once. It ran really rough, especially at idle. Low octane can be bad in such a high compression engine because can cause premature combustion. Maybe explaining the roughness?

[EzK]

I remember reading about a car that was 11:1 compression but ran on regular gas.. Cadillac maybe? Gotta find my MotorTrend.

[OrdnanceMarine]

Originally Posted by EzK

I remember reading about a car that was 11:1 compression but ran on regular gas.. Cadillac maybe? Gotta find my MotorTrend.

Honda has others that are 10.5:1.

[K202K7si]

I will only use Sunoco 94, which here in Kentucky is actually 93 octane not 94, I'm unsure if the previous owner used 87 octane or not, but I have yet to have any problems. I'm not advertising for Sunoco, but it's good gas. Either Shell or Sunoco in my opinion. Will never use BP.

[MugenCSi]

I use shell but why not BP?

[ebdiam]

Shell or Chevron for my car only, it's never ran off any of those inferior petrol fuels! lol

[OrdnanceMarine]

You guys who think there are dramatic differences between gasoline from different companies should invest an hour or so researching the production chain from raw crude to your gas tank. You might realize that many different fuel stations draw gasoline from the same refinery and the refinery doesn't make the gasoline differently depending on which truck is picking up the fuel. Each gasoline company cannot have their own refinery in each and every market, it just isn't feasible so they contract to buy refined product from each other. Therefore, as long as the blend is the same (more ethanol will give you lower MPG) the main factors you should be looking for are fresh product (stations that sell a lot of fuel since gasoline ages, especially quickly when it's blended with ethanol) and clean product (how often do they change their filters and what kind of condition are their tanks in). All other factors are relatively minor.

[ccciiivvviiiccc]

Is that cheap gas at Costco any good?

[Zeuceone]

arco is bad gas to get

[OrdnanceMarine]

Originally Posted by ccciiivvviiiccc

Is that cheap gas at Costco any good?

Costco is what I run 75% of the time (whenever I'm at a gas station out of town since we don't have a Costco within 90 miles) and I've never had any trouble. My thought is that gas at Costco is basically as fresh as you can get since they sell so much they have multiple trucks delivering fuel daily. Freshness counts as most of today’s fuels have alcohol blended in which absorbs water over time and allows octane to fall more quickly than straight gasoline. I always get very high flow rates from their pumps so I think they keep up with pump maintenance such as changing filters out or replacing worn components. With just over 35 MPG during the lifetime of my Si, it seems to be burning quite nicely.

[Bboy_Burst]

i found a receipt of a gas purchase made by the Honda dealer where my car was from. it was from a Shell gas station and it says "Regular @ 6.08 gallon"

[spideryk]

the sunoco down at fredericksburg off of route 1 by the i-95 exit in virginia has fuel with no ethanol added. u can noticeably feel the difference between the %10 enthanol and this one from sunoco

[ccciiivvviiiccc]

Originally Posted by OrdnanceMarine

Costco is what I run 75% of the time (whenever I'm at a gas station out of town since we don't have a Costco within 90 miles) and I've never had any trouble. My thought is that gas at Costco is basically as fresh as you can get since they sell so much they have multiple trucks delivering fuel daily. Freshness counts as most of today’s fuels have alcohol blended in which absorbs water over time and allows octane to fall more quickly than straight gasoline. I always get very high flow rates from their pumps so I think they keep up with pump maintenance such as changing filters out or replacing worn components. With just over 35 MPG during the lifetime of my Si, it seems to be burning quite nicely.

Thank you,..yes Costco only 3 blocks from my house!

[MugenCSi]

Originally Posted by spideryk

the sunoco down at fredericksburg off of route 1 by the i-95 exit in virginia has fuel with no ethanol added. u can noticeably feel the difference between the %10 enthanol and this one from sunoco

hmm I've been getting that hydrogen enriched shell fuel that also has 10% ethanol, any other place other than sunoco that offers fuel without ethanol? and I wonder what dyno charts would look like with 10% ethanol and reg. without ethanol.

[OrdnanceMarine]

Originally Posted by MugenCSi

hmm I've been getting that hydrogen enriched shell fuel that also has 10% ethanol, any other place other than sunoco that offers fuel without ethanol? and I wonder what dyno charts would look like with 10% ethanol and reg. without ethanol.

Probably no real difference on the dyno and any difference would probably be due to the true octane being slightly different from the advertised octane (remember, it's the average of the two methods, at a minimum). The difference would be in MPG. Straight gasoline just plain and simply has more energy (BTU) per gallon than ethanol has and therefore takes less fuel to produce the same amount of power. The reason you wouldn't lose power on the dyno would be that the injectors would just be commanded to inject more fuel for a given amount of air.

[MugenCSi]

Originally Posted by OrdnanceMarine

Probably no real difference on the dyno and any difference would probably be due to the true octane being slightly different from the advertised octane (remember, it's the average of the two methods, at a minimum). The difference would be in MPG. Straight gasoline just plain and simply has more energy (BTU) per gallon than ethanol has and therefore takes less fuel to produce the same amount of power. The reason you wouldn't lose power on the dyno would be that the injectors would just be commanded to inject more fuel for a given amount of air.

ah alright sounds good man that clears up a lot of things thanks

[spideryk]

yeah i have no idea on what the power is cause never dynoed it, but the engine does rev more smoothly. and since gasoline has more energy, i would assume it produces more hp cause wouldnt the a/f ratio be the same?