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premium gas or regular gas video



Bunch of retards.

Of course it won't change a darn thing when you are just cruising around.

It's not misleading either, premium fuel has it's use and it's just that many don't understand the reason for it.
 
it seemed misleading to me because they kept emphasizing that regular was ok most of the time, unless your engine was knocking. having kr and having an engine knock are not the same thing, they were misleading about that.
 
SgtMarshal said:
it seemed misleading to me because they kept emphasizing that regular was ok most of the time, unless your engine was knocking. having kr and having an engine knock are not the same thing, they were misleading about that.
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KR happens because of knock, so it is the same thing.

The whole thing with octane is you only need to use enough octane to prevent knock. If you can run on 87 and not knock then you are not going to gain any power on the same tune running 93. In fact you could lose horsepower at that point.
 
So, the owners manual in my new 1.4 turbo cruze says to use 87 or higher. Based on that I would assume the tune can adjust for higher octane
 


It's not that it can adjust for higher octane, it's just saying the minimum that engine can run safely on without knocking is 87, and it wont have negative effects if you use higher... thus 87 or higher.

I assume they say "or higher" so you dont have people putting in 93 and freaking out that "the manual says to use 87!!"
 
SgtMarshal said:
So, the owners manual in my new 1.4 turbo cruze says to use 87 or higher. Based on that I would assume the tune can adjust for higher octane
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The tune isn't going to adjust for higher octane. It says "or higher" because it means 87 octane minimum and the majority of the populace are morons.
 
the car has 550 miles on it now. I'm not sure what the dealership put in it when I drove it off the lot, but I put 91 in it at the last fill up, and I can't say if I can tell a difference. my gas mileage seems to be about the same, so I'll probably put 87 in it next time and see what happens.

I thought the video would get more of a reaction because if it didn't matter what octane we put in our cars, then a lot of people would run regular or mid grade in their grand prix. maybe I'm missing the point of the video and the conversation, but I was under the assumption that octane was more important, but that people should use the octane what the owners manual said.
 
A lot of people do run regular or mid grade in their Grand Prix. If you never beat on the car then you will likely not notice a difference.

I ran 87 in my Grand Prix when I first got it just to see if there was a difference. I didn't beat on the car at all. I probably did hit boost a few times, but there was zero difference noted. I am sure if I logged I probably would have seen more knock on 87, but power wise and drivability wise the car remained unchanged. Regardless, I still put 93 in at every fill up.
 
the car has 550 miles on it now. I'm not sure what the dealership put in it when I drove it off the lot, but I put 91 in it at the last fill up, and I can't say if I can tell a difference. my gas mileage seems to be about the same, so I'll probably put 87 in it next time and see what happens.

I thought the video would get more of a reaction because if it didn't matter what octane we put in our cars, then a lot of people would run regular or mid grade in their grand prix. maybe I'm missing the point of the video and the conversation, but I was under the assumption that octane was more important, but that people should use the octane what the owners manual said.
Click to expand...



Octane is a measurement of how resistant a particular blend of gasoline is to pre-ignition. This means that the higher the octane, the less likely it will be to spontaneously ignite. This is what we call "knock". Knock is when the gasoline in the cylinder ignites before the spark plug fires. This results in a shockwave inside the motor that can damage the internals, like the pistons and wreck a motor if left unchecked. KR, or Knock Retard is a measurement of how much the engine's computer is retarding, or dialing back, the timing of the ignition when the knock sensors detect it, to prevent the knock from happening.

So, why do we need higher octane gasses that are more resistant to knock? Harsh conditions inside of the combustion chamber are generally what cause knock. Things like boost and high compression are two situations where motors require high octane gasoline, because boost tends to cause knock as well as high compression. The higher octane gasoline allows the motor to push more air into the motor (boost) or allow the motor to "squeeze" the air/fuel charge more before ignition (high compression) without the gasoline igniting before the spark plug fires. Both of these things result in more power, not the high octane gas.

That's a big misconception that had a role in this video, the high octane gas does NOT give the car more power or performance.. in fact sometimes it can reduce performance. You cant just put high octane gas into a Toyota Camry and expect to have it produce more power. The high octane gas allows the car to run boost with a turbo or supercharger, or run high compression, and THOSE things provide more power.

The video seems to insinuate that the high octane gas is just a sham perpetrated by the gasoline companies to rape our wallets and provide no benefits.

Grand prix's can run lower octane gas if you stay out of boost, and the engine computer can retard ignition timing to help stave off knock. Your car probably does the same thing, so with the boost it's probably better to run higher octanes, but the car can cope with lower.
 


A friend on Twitter said he used 87 in his GTP and gave it full throttle and he had to rebuild his motor...
 
Lol, "Did it require premium?" Woman: "No, but it's supposed to be better for your car." Some cars specifically say use only 87 octane.
 
I couldn't finish watching. I guess it's just cool to hate big oil. Heaven forbid the consumer educate themselves. Reading the owners manual is such a hassle.
 
FriboRage said:
Octane is a measurement of how resistant a particular blend of gasoline is to pre-ignition. This means that the higher the octane, the less likely it will be to spontaneously ignite. This is what we call "knock". Knock is when the gasoline in the cylinder ignites before the spark plug fires. This results in a shockwave inside the motor that can damage the internals, like the pistons and wreck a motor if left unchecked. KR, or Knock Retard is a measurement of how much the engine's computer is retarding, or dialing back, the timing of the ignition when the knock sensors detect it, to prevent the knock from happening.

So, why do we need higher octane gasses that are more resistant to knock? Harsh conditions inside of the combustion chamber are generally what cause knock. Things like boost and high compression are two situations where motors require high octane gasoline, because boost tends to cause knock as well as high compression. The higher octane gasoline allows the motor to push more air into the motor (boost) or allow the motor to "squeeze" the air/fuel charge more before ignition (high compression) without the gasoline igniting before the spark plug fires. Both of these things result in more power, not the high octane gas.

That's a big misconception that had a role in this video, the high octane gas does NOT give the car more power or performance.. in fact sometimes it can reduce performance. You cant just put high octane gas into a Toyota Camry and expect to have it produce more power. The high octane gas allows the car to run boost with a turbo or supercharger, or run high compression, and THOSE things provide more power.

The video seems to insinuate that the high octane gas is just a sham perpetrated by the gasoline companies to rape our wallets and provide no benefits.

Grand prix's can run lower octane gas if you stay out of boost, and the engine computer can retard ignition timing to help stave off knock. Your car probably does the same thing, so with the boost it's probably better to run higher octanes, but the car can cope with lower.
Click to expand...


I wish I still had all my dyno sheets on my 78' Diablo with a Goodwrench 350, TES headers and a 3" single exhaust (right side of a Torque Tech mandrel bent exhaust and a 3 chamber flowmaster) Performer intake Mallory distributor (fully adjustable) and a Carter 600 it made 213 HP to the wheels on 87 and on 94 it actually made 10 less hp no matter what jetting, rod spring or distributor setting we tried. Even after changing to a 204/214 cam Vortec heads (64cc instead of 72cc 8.4-9.0 CR) same (but Vortec manifold) I picked up
31 HP on 87 and 36* lead with 94 I was still only 21 HP up even moving to 38* and to 34*. I even ran 100LL from the airport (it was free since my Dad worked there and it was from a refueled plane). We tried again and I made even less HP. A friend had a shop and we would go up there for hours and made a lot of runs on that dyno. We tried up to 40* lead and played with jetting and rods springs and everything and just couldn't make the same power with higher octane fuel, the engine just couldn't use it.

most supercharged cars I have dealt with have always had a way to detect low octane fuel and adjust for it. The Tbird SC would start out with full power, but once it detected that it had lower octane in it it would back off timing and the only way to reset it was to run the tank out and refill it. That was a 89' car and I am sure every other supercharged car has a similar scheme to manage low octane fuel even under abuse. At least to an extent.

Jeff
 


Jesus...


Yea so anyway in this grand prix world your pcm automatically defaults to a high octane table in the pcm and will run that timing unless a certain modifier or knock is present it will then utilize the low octane table.


The whole object is to run as much timing without exceeding MBT. In which case you will start to lose power.
 
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