putting reg gas in by mistake in si, using "octane boost" to correct?

Tronixx · 11-01-2007, 10:30 PM

First, I am new here but I am familiar with the search and have referred to the combined gas thread What grade of gas? All gas questions answered! **Merged all gas threads**. So mods please do not close this thread, I believe it is a slightly different question than what has been posted in there, and is nearly impossible to go through 73 pages of posts about what mileage people are getting to get any answers.

My car was getting close to E so I stopped at a Shell off the highway. Seemed expensive there so I wasn't going to fill up - just put in $15. But I realized I hit the damn Regular button by mistake after putting in the gas (I owned an '04 EX Coupe up to just a few weeks ago which took regular).

I realize it is probably nothing, and maybe I should have just refilled the other half of the tank with premium to make up for it - but the guy inside told me to buy octane boost from off their shelf and that would be the same thing. Just used half of it since I didn't fill up. He also acted like Shell gas has all kinds of detergents and additives that their regular gas probably wouldn't do anything bad on a car that says premium required.

Is there a definitive technical answer on what regular gas may do to an Si motor? And if some octane boost on regular gas would make it ok?

Sevy316 · 11-01-2007, 10:35 PM

octane booster basically adds 3-4 points to the octane. 1 octane is 10 points i believe. So adding octane booster to 89 will bump it to 89.4 essentially

07si sedan · 11-01-2007, 10:38 PM

reg gas will be fine. i wouldnt add the octane booster thing, its a waste.

asndragonboii · 11-01-2007, 10:43 PM

Keep your revs low to prevent knocking until you can refill with your recommeneded octane

02civicsi · 11-01-2007, 10:46 PM

Quote:

Originally Posted by 07si sedan

reg gas will be fine.

Really is that why it states that the Si(K20Z3) requires 91 octane or higher.

Alek · 11-01-2007, 10:51 PM

Quote:

Originally Posted by asndragonboii

Keep your revs low to prevent knocking until you can refill with your recommeneded octane

Exactly, or you can also fill up the rest of the tank with 93 and that should get you close to 91 because $15 is less than 6 gallons and our tank make 13.5 gallons.

Sevy316 · 11-01-2007, 10:51 PM

are there even any gas stations that have 91, because i've only seen 93

effNsi · 11-01-2007, 10:54 PM

in california we have 91

SVB · 11-01-2007, 10:54 PM

Reg gas IS fine. The engine is continuously adjusting the timing and will simply have less power than if you were running 91. No big deal!

Alek · 11-01-2007, 10:56 PM

Quote:

Originally Posted by Sevy316

are there even any gas stations that have 91, because i've only seen 93

In Florida we have 87, 89, 91, 93 in almost every gas station.

***k20z3 Koop*** · 11-01-2007, 10:57 PM

Quote:

Originally Posted by SVB

Reg gas IS fine. The engine is continuously adjusting the timing and will simply have less power than if you were running 91. No big deal!

I disagree sir. Our engines are 11:1 compression that is VERY high. Timing can be retarded only so far. I can almost guarantee he will be detonating in VTEC.

02civicsi · 11-01-2007, 11:01 PM

Quote:

Originally Posted by SVB

Reg gas IS fine. The engine is continuously adjusting the timing and will simply have less power than if you were running 91. No big deal!

Why don't you put some 87 in your Si & come back & tell us it feels fine.

SiFan4tic · 11-01-2007, 11:11 PM

I have an Acura TL ... this car has a J32 engine with the compression ratio 11:1

I hear no pinging... even when I vtec.

I've been putting regular in it for years and the car has no engine troubles at all.

the differences in fuel will affect the car in so small of a fraction, that it's too miniscule to notice even after many years.

Besides new cars aren't meant to break just because u use 87 octane gas...

02civicsi · 11-01-2007, 11:16 PM

Just checked the Acura site & it states "Gasoline with an octane number lower than 91 may be used, with reduced performance." on the TL

SiFan4tic · 11-01-2007, 11:22 PM

still, it wouldn't damage the si, it would just have less power.

leonphelpss11 · 11-01-2007, 11:24 PM

It is fine to use Reg gas just this time. Do not do it again. It will affect a lot of diff things beside performance. Just don't drive it hard or anything with teh reg gas in there. DO NOT put octane booster in there. It is also proven that octane booster will actually lower your performance.

leonphelpss11 · 11-01-2007, 11:25 PM

Quote:

Originally Posted by SiFan4tic

still, it wouldn't damage the si, it would just have less power.

It will damage the si eventually. I don't want to list the reason why 87 octane is not good for our engine, its long and complicated

02civicsi · 11-01-2007, 11:36 PM

Quote:

Originally Posted by SiFan4tic

still, it wouldn't damage the si, it would just have less power.

The J32 & the K20Z3 are two totally different motors with different requirements for fuel.

Solo2EG · 11-01-2007, 11:57 PM

Just keep it out of VTEC as much as possible until you can top it off with Premium, it will be fine.

kenchan · 11-02-2007, 12:04 AM

griot's sell siphon pumps... fill up your other car with the gas that's in
your Si. lol

11-01-2007, 10:30 PM	#1 (permalink)
Tronixx Senior Member Join Date: Oct 2007 Posts: 201 iTrader: 0 / 0%	putting reg gas in by mistake in si, using "octane boost" to correct? First, I am new here but I am familiar with the search and have referred to the combined gas thread What grade of gas? All gas questions answered! Merged all gas threads. So mods please do not close this thread, I believe it is a slightly different question than what has been posted in there, and is nearly impossible to go through 73 pages of posts about what mileage people are getting to get any answers. My car was getting close to E so I stopped at a Shell off the highway. Seemed expensive there so I wasn't going to fill up - just put in $15. But I realized I hit the damn Regular button by mistake after putting in the gas (I owned an '04 EX Coupe up to just a few weeks ago which took regular). I realize it is probably nothing, and maybe I should have just refilled the other half of the tank with premium to make up for it - but the guy inside told me to buy octane boost from off their shelf and that would be the same thing. Just used half of it since I didn't fill up. He also acted like Shell gas has all kinds of detergents and additives that their regular gas probably wouldn't do anything bad on a car that says premium required. Is there a definitive technical answer on what regular gas may do to an Si motor? And if some octane boost on regular gas would make it ok?

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11-01-2007, 10:35 PM	#2 (permalink)
Sevy316 Senior Member Join Date: Sep 2007 Location: Cleveland Age: 23 Posts: 301 Jon iTrader: 0 / 0%	octane booster basically adds 3-4 points to the octane. 1 octane is 10 points i believe. So adding octane booster to 89 will bump it to 89.4 essentially

11-01-2007, 10:38 PM	#3 (permalink)
07si sedan Senior Member Join Date: Apr 2007 Location: Dsm IA Posts: 857 iTrader: 1 / 100%	reg gas will be fine. i wouldnt add the octane booster thing, its a waste.

11-01-2007, 10:43 PM	#4 (permalink)
asndragonboii Senior Member Join Date: May 2006 Posts: 3,315 iTrader: 0 / 0%	Keep your revs low to prevent knocking until you can refill with your recommeneded octane

11-01-2007, 10:51 PM	#7 (permalink)
Sevy316 Senior Member Join Date: Sep 2007 Location: Cleveland Age: 23 Posts: 301 Jon iTrader: 0 / 0%	are there even any gas stations that have 91, because i've only seen 93

11-01-2007, 10:54 PM	#8 (permalink)
effNsi Senior Member Join Date: Aug 2007 Location: NOR CAL Age: 25 Posts: 1,491 iTrader: 2 / 100%	in california we have 91

11-01-2007, 10:54 PM	#9 (permalink)
SVB Member Join Date: Feb 2006 Location: AZ Age: 34 Posts: 49 iTrader: 0 / 0%	Reg gas IS fine. The engine is continuously adjusting the timing and will simply have less power than if you were running 91. No big deal!

11-01-2007, 11:11 PM	#13 (permalink)
SiFan4tic Senior Member Join Date: Jul 2007 Posts: 211 iTrader: 0 / 0%	I have an Acura TL ... this car has a J32 engine with the compression ratio 11:1 I hear no pinging... even when I vtec. I've been putting regular in it for years and the car has no engine troubles at all. the differences in fuel will affect the car in so small of a fraction, that it's too miniscule to notice even after many years. Besides new cars aren't meant to break just because u use 87 octane gas...

11-01-2007, 11:16 PM	#14 (permalink)
02civicsi Senior Member Join Date: Jan 2007 Location: Lonnngwoooood, FL Posts: 8,040 I am the Juggernaut!!! iTrader: 18 / 100%	Just checked the Acura site & it states "Gasoline with an octane number lower than 91 may be used, with reduced performance." on the TL

11-01-2007, 11:22 PM	#15 (permalink)
SiFan4tic Senior Member Join Date: Jul 2007 Posts: 211 iTrader: 0 / 0%	still, it wouldn't damage the si, it would just have less power.

11-01-2007, 11:24 PM	#16 (permalink)
leonphelpss11 Senior Member Join Date: May 2007 Location: SWLA Posts: 1,409 iTrader: 6 / 100%	It is fine to use Reg gas just this time. Do not do it again. It will affect a lot of diff things beside performance. Just don't drive it hard or anything with teh reg gas in there. DO NOT put octane booster in there. It is also proven that octane booster will actually lower your performance.

11-01-2007, 11:57 PM	#19 (permalink)
Solo2EG Senior Member Join Date: Jul 2007 Location: Canada eh! Posts: 853 Tod iTrader: 0 / 0%	Just keep it out of VTEC as much as possible until you can top it off with Premium, it will be fine.

11-02-2007, 12:04 AM	#20 (permalink)
kenchan Senior Member Join Date: Apr 2006 Location: Midwest Posts: 2,548 iTrader: 1 / 100%	griot's sell siphon pumps... fill up your other car with the gas that's in your Si. lol