should GSR sip on regular or premium fuel?

[esco97civicR]

So iv'e had my dc2 GSR for about a year now. When I purchased it I noticed it said premium unleaded on the cluster, I started out pumping premium but gas is high and funds are low so lately iv'e been pumping regular. I really need some feedback on weather pumping regular fuel will harm my GSR?!? Any info will be greatly appreciated !

[iamdallas]

The high compression = need for premium fuel in short. I don't really think that regular will harm the car in any way, but you'll probably be able to tell a negative difference in performance and economy.

[esco97civicR]

So pretty much regular gas will make it run shittier than running it on premium... Um how about midgrade gas?

[iamdallas]

midgrade is equal parts regular and premium. You decide. Try it and see what you think...

[esco97civicR]

Preesh bro... Its a question that iv'e always wanted to ask.

[iamdallas]

But... some people say that prolonged use will cause deterioration of the engine. Probably true, but you can get away with a cheap fill up once in a while or even midgrade.

Try it... and if it causes any noise that wasn't previously there don't do it any more. The idea is that under high compression, such as your motor, will cause the gas to combust before the spark. Predetonation = bad. (That causes knocks and that is a REALLY BAD THING) But lots of people have no problem with using 87 for daily driving. Keep your foot off the pedal and there will likely be no knock. But don't redline your motor constantly with the stuff. /COULD/ cause damage.

What is the compression ratio on a GSR? Probably around or up to 11:1 I would guess.

Just don't do it ALL the time if you notice any difference.

[allout13]

meh
your cars performance will suffer slightly. the knock sensor will prevent the motor from knocking by retarding the motors timing which will allow you to run 87 octane fuel. If you just want to save money, I'd go ahead and run regular.

[iamdallas]

^^that's about how I feel about it, but I didn't wanna be like "go ahead" and have him come back swearing because he has a knock. lol.

edit: (post #666 right there)

[Cynical 1]

i run midgrade (89) in my civic (gsr swap) and have no issues with it regarding detonation or running badly.

[Mista Foe-Doe]

i have a gsr i run 93 and noting but 93 ...but i have upgraded pistons and higher compression

[Vteckidd]

So pretty much regular gas will make it run shittier than running it on premium... Um how about midgrade gas?

itll run fine on 87 octane. If its a stock motor IIRC its 10:1, 87 octane is perfectly fine. It will NOT CAUSE DAMAGE.

It also depends on how hard you drive it. If you are going to be redlining and taching it out all day long, then may want to run 89. But if you are just cruising to and from work and not beating the dog shit out of it, run 87.

I have a 05 TL i run 87 in because i putt to and from work at 80 mph and 40% throttle. if i know im gonna go out and drive it hard, ill throw 93 in it

[Vteckidd]

But... some people say that prolonged use will cause deterioration of the engine. Probably true, but you can get away with a cheap fill up once in a while or even midgrade.

Yeah maybe over 50,000-75000 miles it might be a little DIRTIER than running 93 octane. But that is easily cured by running and engine clean product. or a fuel inector clean. keeping oil clean is way more important than running 93 octane.

Try it... and if it causes any noise that wasn't previously there don't do it any more. The idea is that under high compression, such as your motor, will cause the gas to combust before the spark. Predetonation = bad. (That causes knocks and that is a REALLY BAD THING) But lots of people have no problem with using 87 for daily driving. Keep your foot off the pedal and there will likely be no knock. But don't redline your motor constantly with the stuff. /COULD/ cause damage.

Knock sensor will keep it from detonating. Plus , 87 octane is perfectly normal up to prob 11:1 compression. stock gsr motor will not knock on 87 octane unless IATs are 220 degrees lol

What is the compression ratio on a GSR? Probably around or up to 11:1 I would guess.

Just don't do it ALL the time if you notice any difference.

USDM is 10:1

[1moreaccord]

here's something to think about...

the higher grade fuel WILL increase power and mileage! But by how much is the question?

- Let's say it increased gas mileage by 2 mpg's.
- On a ~ 13 gallon tank that would be 26 extra miles you could go on a tank of gas.
- If you average 26 mpg's vs. 24 on low grade then you effectively used one less gallon of fuel to cover the same distance as the lowest grade fuel. Which at the price per gallon ~ $3.69
- So a fill up of 13 gallons of 93 @ 4.09 = $53.17
- A fill up of 13 gallons of 85 @ 3.69 = $47.97
- Now add in the amount of fuel to cover equivalent distances so $47.97 + $3.69 = $51.66
- Price difference = $53.17 - $51.66 = $1.51

When it's all said and done you may be saving $1.51 by switching to the lowest grade. As well as decreased performance. (oh and if premium is only $4 where you live, you only save $0.34 buying low grade!)



Disclaimer - Nearly all my figures are estimated, I'm just trying to make a point which argued here could potentially be valid.

[Starrfire]

I have a gsr and when hurricane Katrina hit and there wasn't any fuel I was forced to run with regular. There isn't much of a difference but I did inspect the spark plugs afterward and they were covered in red powder so there was some small amount of detonation.

[Tech5]

Like most had said 87 will be fine !

[esco97civicR]

here's something to think about...

the higher grade fuel WILL increase power and mileage! But by how much is the question?

- Let's say it increased gas mileage by 2 mpg's.
- On a ~ 13 gallon tank that would be 26 extra miles you could go on a tank of gas.
- If you average 26 mpg's vs. 24 on low grade then you effectively used one less gallon of fuel to cover the same distance as the lowest grade fuel. Which at the price per gallon ~ $3.69
- So a fill up of 13 gallons of 93 @ 4.09 = $53.17
- A fill up of 13 gallons of 85 @ 3.69 = $47.97
- Now add in the amount of fuel to cover equivalent distances so $47.97 + $3.69 = $51.66
- Price difference = $53.17 - $51.66 = $1.51

When it's all said and done you may be saving $1.51 by switching to the lowest grade. As well as decreased performance. (oh and if premium is only $4 where you live, you only save $0.34 buying low grade!)



Disclaimer - Nearly all my figures are estimated, I'm just trying to make a point which argued here could potentially be valid.

i appreciate al the help! i like this guys technicality, but anyways i ran premium this weekend and the only difference i felt was a great one. Iv'e had this problem of my dc2 running insanely sluggish when the AC is on, but with premium fuel its driving beautifully with AC blasting. What do y'all think?

[candycoated]

my vote....midgrade. you dont wana go with out and your car shouldnt either. both can m ake eqaul sacrafice