LS1FIRE
11-09-2004, 03:05 AM
is it ok to run 100 octane our higher in my car?
Fueling & Injection - 100 octane ok to run?
View Full Version : 100 octane ok to run?
2MuchRiceMakesMeSick
11-09-2004, 03:29 AM
Why would you want to do this? Higher octane does not give you more horse power and with your mods you will probably lose horsepower.
jimmyblue
11-09-2004, 09:12 AM
Anything higher than 100 is almost certain to be
leaded, too. Unless you are very high compression
or forced induction there is no point to race gas.
If you are pinging, it's a tune problem, a parts
problem or a hygeine problem most likely.
leaded, too. Unless you are very high compression
or forced induction there is no point to race gas.
If you are pinging, it's a tune problem, a parts
problem or a hygeine problem most likely.
WS6 RULES
11-09-2004, 09:49 AM
Higher octane does not give more HP!? Wow thats a new one. You need to do some homework. Heck yeah you will run much stronger with 100 octane. But you will have to advance the timing to match it. This is all old news. High octane burns slower so the piston gets a nice push down. Low octane burns to fast and that is where the knock and ping come from. The shock wave hits the piston and then traveles back up to the head. You want to push the piston down not knock it down. High octane = more power, simple as that. Why do you think Nascar is using, what is it 110 octane.
Remember to advance your timing. If you don't you will not see any gain and you will burn the exhaust valves. The long flame (ever watch top fuelers) will act like a torch on your valves, with advanced timing the fuel will burn before the exhaust valve sees it. I like the 100 octane for the power and milage but it just costs too much for me.
Remember to advance your timing. If you don't you will not see any gain and you will burn the exhaust valves. The long flame (ever watch top fuelers) will act like a torch on your valves, with advanced timing the fuel will burn before the exhaust valve sees it. I like the 100 octane for the power and milage but it just costs too much for me.
Race Car Driver
11-09-2004, 10:18 AM
Octane is an expression of a fuel's resistance to detonation, and higher octane (100+) is a waste of money unless you have compression above 11:1, high boost or it might be useful if you are spraying heavily.
skewba98z28
11-09-2004, 11:03 AM
Exactly Gas will detonate under pressure higher octane means it takes more pressure to detonate. That's all it is.
2MuchRiceMakesMeSick
11-09-2004, 11:08 AM
Higher octane does not give more HP!? Wow thats a new one. You need to do some homework. Heck yeah you will run much stronger with 100 octane. But you will have to advance the timing to match it. This is all old news. High octane burns slower so the piston gets a nice push down. Low octane burns to fast and that is where the knock and ping come from. The shock wave hits the piston and then traveles back up to the head. You want to push the piston down not knock it down. High octane = more power, simple as that. Why do you think Nascar is using, what is it 110 octane.
Remember to advance your timing. If you don't you will not see any gain and you will burn the exhaust valves. The long flame (ever watch top fuelers) will act like a torch on your valves, with advanced timing the fuel will burn before the exhaust valve sees it. I like the 100 octane for the power and milage but it just costs too much for me.
With his mods he will lose hp...Octane is a temperature resistance rating at which the gas combusts...simple as that. It sounds like your the one needing the homework.
Remember to advance your timing. If you don't you will not see any gain and you will burn the exhaust valves. The long flame (ever watch top fuelers) will act like a torch on your valves, with advanced timing the fuel will burn before the exhaust valve sees it. I like the 100 octane for the power and milage but it just costs too much for me.
With his mods he will lose hp...Octane is a temperature resistance rating at which the gas combusts...simple as that. It sounds like your the one needing the homework.
LS1FIRE
11-09-2004, 11:37 AM
The 76 station near my house has a 100 unleaded octane pump Jus was curious if i should fill some of that stuff up when i go to the tracks. Maybe a 50 50 mixture of 92 octane and 100 should be ok?
Uno99
11-09-2004, 11:58 AM
Don't waste your money.
jimmyblue
11-09-2004, 12:01 PM
If you're tuned right for 92 then adding 100 will not
really help you. The slow burn and same timing just
means you can expect to throw more energy out
the pipe at higher RPM instead of fully expanding it
in the cylinder for delivered wheel power. If you're
tuned to the raggedy edge then it's a different story.
If you ping because your local gas is crappy and can't
do anything about it, a little slug of 100 might fix that.
But if you don't ping or pick up KR at WOT, now, the
100 isn't likely to show you anything.
'98s are prone to false KR and a 100-octane fillup is
one way to separate false from true, however.
really help you. The slow burn and same timing just
means you can expect to throw more energy out
the pipe at higher RPM instead of fully expanding it
in the cylinder for delivered wheel power. If you're
tuned to the raggedy edge then it's a different story.
If you ping because your local gas is crappy and can't
do anything about it, a little slug of 100 might fix that.
But if you don't ping or pick up KR at WOT, now, the
100 isn't likely to show you anything.
'98s are prone to false KR and a 100-octane fillup is
one way to separate false from true, however.
bad2000ss
11-09-2004, 12:05 PM
The 76 station near my house has a 100 unleaded octane pump Jus was curious if i should fill some of that stuff up when i go to the tracks. Maybe a 50 50 mixture of 92 octane and 100 should be ok?
Like everyone else has said, there really isn't any reason for you to run 100 octane or any more octane than premium pump gas (91,92,93). Higher octane does not add horsepower, it just helps prevent detonation caused by things that do add more horsepower like higher compression and/or more timing.
The only way you will actually see a performance increase with 100 octane would be if your car has a TERRIBLE tune causing the pcm to pull timing due to knock. If you are running 33 degrees of timing 100 octane wouldn't be a terrible Idea, but you still wouldn't need pure 100, especially for a bolt on car.
Like everyone else has said, there really isn't any reason for you to run 100 octane or any more octane than premium pump gas (91,92,93). Higher octane does not add horsepower, it just helps prevent detonation caused by things that do add more horsepower like higher compression and/or more timing.
The only way you will actually see a performance increase with 100 octane would be if your car has a TERRIBLE tune causing the pcm to pull timing due to knock. If you are running 33 degrees of timing 100 octane wouldn't be a terrible Idea, but you still wouldn't need pure 100, especially for a bolt on car.
LS1FIRE
11-10-2004, 01:01 AM
The gas here seems to be lower quality. I guess adding some of the 100 octane will boost back up the octane to 95 our somthing if i mix it 50 50 with 92 wich is actualy like 90. Well i think. not sure tho.