100 octane= Big difference?
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Newbie
Joined: Aug 2006
Posts: 14
100 octane= Big difference?
I prob. sound like a dumb @$$ but thats ok. Gas Station by where I work has 100 unleaded octane and 110 leaded octane gas in a pump. I run 93 in my 02 ss. If i were to put 100 in would i notice a lage difference. Or not worth it. Thanks
4th Gear Member
Joined: Jun 2005
Posts: 1,687
RE: 100 octane= Big difference?
No, octane does not make any hp. What higher octane does is allow you to run higher compression without pre-ignition. If your car does not ping on 93, you will not see any performance improvment with more octane.
In the Staging Lanes
Joined: Aug 2006
Posts: 85
From: Canton, Michigan
RE: 100 octane= Big difference?
Well pre-ignition causes an imbalance in the timing. The pre-ignition acts as a drag overall where as a vehicle with high octane will not see this and will fire off more accurately resulting in a faster spin. So actually it does make a difference. The more power you have the more this will be realized. The knock sensor also plays a factor and higher octane will keep this unit from retarding the timing as much since detonation will be less prevalent.
If your car is stock 94 should do however nothing beats the smell of high octane gas and every little bit helps when you got a serious race.
If your car is stock 94 should do however nothing beats the smell of high octane gas and every little bit helps when you got a serious race.
4th Gear Member
Joined: Jun 2005
Posts: 1,687
RE: 100 octane= Big difference?
ORIGINAL: freebird230
I sure wish I worked there or even lived close to get that kind of octane!!! How much is the 110 octane or the 100 octane? I have to buy octane boost to just live with my 14-1 big block!
I sure wish I worked there or even lived close to get that kind of octane!!! How much is the 110 octane or the 100 octane? I have to buy octane boost to just live with my 14-1 big block!
4th Gear Member
Joined: Jun 2005
Posts: 1,687
RE: 100 octane= Big difference?
ORIGINAL: sellc
Well pre-ignition causes an imbalance in the timing. The pre-ignition acts as a drag overall where as a vehicle with high octane will not see this and will fire off more accurately resulting in a faster spin. So actually it does make a difference. The more power you have the more this will be realized. The knock sensor also plays a factor and higher octane will keep this unit from retarding the timing as much since detonation will be less prevalent.
If your car is stock 94 should do however nothing beats the smell of high octane gas and every little bit helps when you got a serious race.
Well pre-ignition causes an imbalance in the timing. The pre-ignition acts as a drag overall where as a vehicle with high octane will not see this and will fire off more accurately resulting in a faster spin. So actually it does make a difference. The more power you have the more this will be realized. The knock sensor also plays a factor and higher octane will keep this unit from retarding the timing as much since detonation will be less prevalent.
If your car is stock 94 should do however nothing beats the smell of high octane gas and every little bit helps when you got a serious race.
2nd Gear member
Joined: Jul 2005
Posts: 694
From:
RE: 100 octane= Big difference?
when i had my car tuned the guy actually asked me if i used 100 octane, i asked him why that would matter over 94 octane and this is what he said. "with no tune 100 octane would be useless, that is correct, but if you were to tune the car for 100 octane, you could slightly lean out the A/F ratio without detonation, raising horses slightly if you have a decent size Mod list, and it keep's the motor running cooler."
didnt sound right to me so i didnt do it, i might try when i get my laptop tune setup, but i didnt like the idea of only buying 100 octane gas, at almost 5 bucks a gallon.
I have mixed 100 octane with about a half tank of 94 for the hell of it and did notice the motor was more responsive, but then again thats on an LT1 with decent mods, im not sure how it would work with stock valves, i have herd they could burn up on stock heads, if not tuned right.
didnt sound right to me so i didnt do it, i might try when i get my laptop tune setup, but i didnt like the idea of only buying 100 octane gas, at almost 5 bucks a gallon.
I have mixed 100 octane with about a half tank of 94 for the hell of it and did notice the motor was more responsive, but then again thats on an LT1 with decent mods, im not sure how it would work with stock valves, i have herd they could burn up on stock heads, if not tuned right.
4th Gear Member
Joined: Jun 2005
Posts: 1,687
RE: 100 octane= Big difference?
Running lean could hurt the valves over time. Here is how it works. Higher octane allows the engine to run more timing, more timing equals more hp BUT only to a point. If the engine can run it's max timing on 93 octane, going to 100 won't make more power. This is a really basic explantion, if you really want to learn about octane and what it does read this.
http://www.faqs.org/faqs/autos/gasoline-faq/part3/
http://www.faqs.org/faqs/autos/gasoline-faq/part3/
4th Gear Member
Joined: Jun 2005
Posts: 1,687
RE: 100 octane= Big difference?
Here is a quick paragraph from that article I linked.
6.13 Can higher octane fuels give me more power?
On modern engines with sophisticated engine management systems, the engine
can operate efficiently on fuels of a wider range of octane rating, but there
remains an optimum octane for the engine under specific driving conditions.
Older cars without such systems are more restricted in their choice of fuel,
as the engine can not automatically adjust to accommodate lower octane fuel.
Because knock is so destructive, owners of older cars must use fuel that will
not knock under the most demanding conditions they encounter, and must
continue to use that fuel, even if they only occasionally require the octane.
If you are already using the proper octane fuel, you will not obtain more
power from higher octane fuels. The engine will be already operating at
optimum settings, and a higher octane should have no effect on the management
system. Your driveability and fuel economy will remain the same. The higher
octane fuel costs more, so you are just throwing money away. If you are
already using a fuel with an octane rating slightly below the optimum, then
using a higher octane fuel will cause the engine management system to move to
the optimum settings, possibly resulting in both increased power and improved
fuel economy. You may be able to change octanes between seasons ( reduce
octane in winter ) to obtain the most cost-effective fuel without loss of
driveability.
Once you have identified the fuel that keeps the engine at optimum settings,
there is no advantage in moving to an even higher octane fuel. The
manufacturer's recommendation is conservative, so you may be able to
carefully reduce the fuel octane. The penalty for getting it badly wrong,
and not realising that you have, could be expensive engine damage.
On modern engines with sophisticated engine management systems, the engine
can operate efficiently on fuels of a wider range of octane rating, but there
remains an optimum octane for the engine under specific driving conditions.
Older cars without such systems are more restricted in their choice of fuel,
as the engine can not automatically adjust to accommodate lower octane fuel.
Because knock is so destructive, owners of older cars must use fuel that will
not knock under the most demanding conditions they encounter, and must
continue to use that fuel, even if they only occasionally require the octane.
If you are already using the proper octane fuel, you will not obtain more
power from higher octane fuels. The engine will be already operating at
optimum settings, and a higher octane should have no effect on the management
system. Your driveability and fuel economy will remain the same. The higher
octane fuel costs more, so you are just throwing money away. If you are
already using a fuel with an octane rating slightly below the optimum, then
using a higher octane fuel will cause the engine management system to move to
the optimum settings, possibly resulting in both increased power and improved
fuel economy. You may be able to change octanes between seasons ( reduce
octane in winter ) to obtain the most cost-effective fuel without loss of
driveability.
Once you have identified the fuel that keeps the engine at optimum settings,
there is no advantage in moving to an even higher octane fuel. The
manufacturer's recommendation is conservative, so you may be able to
carefully reduce the fuel octane. The penalty for getting it badly wrong,
and not realising that you have, could be expensive engine damage.
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