Higher Octane=Better Running??? Totally Confused-Halp!!
03-11-2010, 10:23 AM
#11
2nd Gear Member
Join Date: Feb 2008
Location: Nebraska
Posts: 176
^Yes indeed, mine likes to stick at a high idle sometimes when Im driving around town and come to a stop/idle. I've cleaned it several times and usually helps alot, but mine seems to the point where it just needs replaced. Ive also made a restrictor plate for it, and that did help with the hanging rmps, it drops nicely now, when it don't stick. So try cleaning the iac and see if you get a reaction, also +1 on the platnium plugs not needing gaped, not sure what you have?
03-11-2010, 08:36 PM
#12
1st Gear Member
Join Date: Sep 2009
Location: CO
Posts: 101
^Yes indeed, mine likes to stick at a high idle sometimes when Im driving around town and come to a stop/idle. I've cleaned it several times and usually helps alot, but mine seems to the point where it just needs replaced. Ive also made a restrictor plate for it, and that did help with the hanging rmps, it drops nicely now, when it don't stick. So try cleaning the iac and see if you get a reaction, also +1 on the platnium plugs not needing gaped, not sure what you have?
03-12-2010, 02:10 AM
#13
3rd Gear Member
Join Date: Jul 2009
Location: California
Posts: 875
As for the gasoline part of the discussion, I hear and feel a noticable difference in sound and performance when I pump 87 to 91. In my case, 87 burns really fast and doesn't run so well at high RPM's. However, 91 burns cleaner and lasts noticably longer, performs better at high RPM's and the sounds much better. All shell or chevron by the way.
why is that? I'm sure there's a benefit in pumping 91 than 87.
I'm really interested in this topic because I dont want to be wasting my money.
Even the OP felt a diff in changing octane....
why is that? I'm sure there's a benefit in pumping 91 than 87.
I'm really interested in this topic because I dont want to be wasting my money.
Even the OP felt a diff in changing octane....
03-12-2010, 08:01 PM
#14
5th Gear Member
Join Date: Sep 2006
Location: CA
Posts: 4,039
As for the gasoline part of the discussion, I hear and feel a noticable difference in sound and performance when I pump 87 to 91. In my case, 87 burns really fast and doesn't run so well at high RPM's. However, 91 burns cleaner and lasts noticably longer, performs better at high RPM's and the sounds much better. All shell or chevron by the way.
why is that? I'm sure there's a benefit in pumping 91 than 87.
I'm really interested in this topic because I dont want to be wasting my money.
Even the OP felt a diff in changing octane....
why is that? I'm sure there's a benefit in pumping 91 than 87.
I'm really interested in this topic because I dont want to be wasting my money.
Even the OP felt a diff in changing octane....
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
Last edited by tbirdscwd; 03-12-2010 at 08:03 PM.
03-12-2010, 09:27 PM
#15
1st Gear Member
Join Date: Mar 2008
Location: Maryland
Posts: 125
If your car is stock compression and running the stock timing, you are completely wasting your money by running 91 octane fuel. No question about it.
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
second, as he was saying, using any gas that your car is not tuned too will hurt your performance and gas mileage significantly. your engine (if stock) is timed to ignite at a certain time, if you have a gas that ignites easier(97 lets say) then when your car is timed, then it fu@ks up the timing an gas ignites too quick.
Keep in mind its all in milli seconds but it still is a big problem, bad on the motor to boot.
03-12-2010, 10:30 PM
#16
3rd Gear Member
Join Date: Jul 2009
Location: California
Posts: 875
If your car is stock compression and running the stock timing, you are completely wasting your money by running 91 octane fuel. No question about it.
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
First off I gotta say SHELL ALL THE WAY...i get much better gas mileage over other gas stations, I get cleaner gas, and my car performs a bit better.
second, as he was saying, using any gas that your car is not tuned too will hurt your performance and gas mileage significantly. your engine (if stock) is timed to ignite at a certain time, if you have a gas that ignites easier(97 lets say) then when your car is timed, then it fu@ks up the timing an gas ignites too quick.
Keep in mind its all in milli seconds but it still is a big problem, bad on the motor to boot.
second, as he was saying, using any gas that your car is not tuned too will hurt your performance and gas mileage significantly. your engine (if stock) is timed to ignite at a certain time, if you have a gas that ignites easier(97 lets say) then when your car is timed, then it fu@ks up the timing an gas ignites too quick.
Keep in mind its all in milli seconds but it still is a big problem, bad on the motor to boot.
maniac, yea, shell is good to my car. haha thanks again...
03-12-2010, 11:32 PM
#18
3rd Gear Member
Join Date: Jul 2009
Location: California
Posts: 875
03-16-2010, 04:55 AM
#19
2nd Gear Member
Join Date: Feb 2008
Location: Nebraska
Posts: 176
If your car is stock compression and running the stock timing, you are completely wasting your money by running 91 octane fuel. No question about it.
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
An octane rating simply is a numerical representation of a certain fuel's resistance to detonation or pre-ignition. 91 octane does not burn any cleaner or release any more power when burned than 87 octane. The benefit of running a higher octane fuel is that you can run more timing or higher compression. Power adders also require the use of higher octane fuels because they increase the pressure in the combustion chambers.
The exception is sometimes carbon deposits can cause your compression to increase and therefore some engines with excessive deposits will run better on higher octane fuel. I thought that was already stated, but maybe I'm thinking of another thread.
03-16-2010, 03:58 PM
#20
5th Gear Member
Join Date: Sep 2006
Location: CA
Posts: 4,039
Well you must never get gas in western Nebraska lol(I think we get the bad gas or something), anytime I run 87 around here(even when I was stock), I would have poor performance, pinging etc. No matter what gas stations I used, I've always ran better on 91. Especially when temp.s are way high 87 gives and gave me problems.