Noob question

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Noob question

Postby 88alltracohio » Sun Oct 15, 2006 1:13 am

Like I said, a noob question... How important is 91 oct. fuel, how bad is 87 for a ST165? Sorry, thanks...
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Postby syko says » Sun Oct 15, 2006 1:15 am

i dont think youd want to try 87 oct with a 3sgte.. knocking can occur. higher octane reduces knock/detonation/pinging (all the same thing iirc).


PS. yes i know gas prices hurt me too. + my mpg is pretty horrible :D
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Postby 88alltracohio » Sun Oct 15, 2006 1:21 am

haha, yeah i filled up today and uhhh... well im trying to save up for an exhaust so i put in 87 :roll:
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Postby syko says » Sun Oct 15, 2006 1:33 am

im not too sure as to how it would react if you just put it in and not boost. boosting with 87 may cause knocking (because of the higher temps of the engine). :shrug: maybe someone can clarify this.
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Postby Gary » Sun Oct 15, 2006 3:41 am

Pro: cheap
Cons: poor performance, ecu retards timing, one good knock can foul stock knock sensor (a new one is not cheap) and 2 worst case scenarios are blown HG and damaged internals.
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Postby toayoztan » Sun Oct 15, 2006 6:46 am

Also, look at it this way:

the difference between 91 and 87 octane is usually around 20 cents

20 cents on a complete full tank of 18 gallons saves you $3.60

let's say gas is 2.50 per gallon, that means 3.60 will give you 1.44 extra gallons.

1.44 extra gallons let's say at 20mpg on the alltrac gives you 28.8 miles

So...do you reallly want to risk your engine for an extra 30 miles? To some, that lasts an extra couple days, to others that isn't much at all (it's all relative).

Or, you can look at it more general. From the math given above, you gain an extra 1.6 miles for every gallon you purchase of 87 vs 91. That isn't much in the short run.

I wouldn't risk it for 30 miles :wink:

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Postby syko says » Sun Oct 15, 2006 6:58 am

toayoztan wrote:Also, look at it this way:

the difference between 91 and 87 octane is usually around 20 cents

20 cents on a complete full tank of 18 gallons saves you $3.60

let's say gas is 2.50 per gallon, that means 3.60 will give you 1.44 extra gallons.

1.44 extra gallons let's say at 20mpg on the alltrac gives you 28.8 miles

So...do you reallly want to risk your engine for an extra 30 miles? To some, that lasts an extra couple days, to others that isn't much at all (it's all relative).

Or, you can look at it more general. From the math given above, you gain an extra 1.6 miles for every gallon you purchase of 87 vs 91. That isn't much in the short run.

I wouldn't risk it for 30 miles :wink:

Bryan


VERY well said bryan. the moral of the story is: we have 18 gallon tanks? i thought it was 16? :shrug: the other moral of the story is: wow, you guys pay cheap for gas :D (i pay around $3.15). naw but you get the point :wink:
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Postby toayoztan » Sun Oct 15, 2006 7:46 am

Thanks, but i could go further! At 3.15/gallon, that's even less miles you get through "savings" of the 87 vs 91.

But we can look into this even further. Our cars (given mpg and tank size) is geared around 340-400 miles on a tank (depending on car condition and driving habits).

Let's say we do get only 30 miles (again, depending on car condition and driving habits) extra choosing 87 over 91. That's only roughly 8-10% increase in gas mileage.

It's all relative, but 8% to me does not justify risking my engine for the things Gary mentioned.

And guys, if we were THAT worried about gas mileage, how much to pay for gas, etc, then we shouldn't (and probably half of us wouldn't) have bought an alltrac :wink:

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Postby Gary » Sun Oct 15, 2006 1:32 pm

toayoztan wrote:And guys, if we were THAT worried about gas mileage, how much to pay for gas, etc, then we shouldn't (and probably half of us wouldn't) have bought an alltrac :wink:

QFT
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Postby 88alltracohio » Sun Oct 15, 2006 7:56 pm

That's very true, thanks.
88 ST165: SOLD :(
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93 Del Sol: Daily driver
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Postby theUNYTEDone » Mon Oct 16, 2006 11:41 pm

i thought our tanks are 13gal?

also, at gary: what's QFT?

quite fricken true? :lol: :D

honestly...gas mileage isnt TOO bad unless youre comparing a big block chevy engine to a civic.

anything AROUND 20mpg to me is pretty good. maybe not if you commute long distances, but in that case...get a civic!
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Postby Gary » Tue Oct 17, 2006 12:03 am

QFT = Quoted For the Truth = you agree with the person
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Postby toayoztan » Wed Oct 18, 2006 2:48 am

theUNYTEDone wrote:i thought our tanks are 13gal?

also, at gary: what's QFT?

quite fricken true? :lol: :D

honestly...gas mileage isnt TOO bad unless youre comparing a big block chevy engine to a civic.

anything AROUND 20mpg to me is pretty good. maybe not if you commute long distances, but in that case...get a civic!


What makes you ever think we had a 13 gallon tank? That's a little more off than thinking we had a 16 gallon tank.

Do you not let your gas tank run close to E, and then fill up a full tank? Just curious, because some people don't let it get that near empty.

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Postby ___Scott___ » Wed Oct 18, 2006 3:27 am

The OP has an ST165 which has a 15.9 gallon tank. I don know what size an ST185 has, but since it's heavier I would expect it to be bigger.
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Postby SuperWhite92 » Wed Oct 18, 2006 4:02 am

___Scott___ wrote:The OP has an ST165 which has a 15.9 gallon tank. I don know what size an ST185 has, but since it's heavier I would expect it to be bigger.


18 gallons, 16ish before the fuel light comes on
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