come up by me in putnam county.
come up by me in putnam county.
What most people have a hard time wrapping their heads around is the concept that higher RPM does not equal higher load on the engine. In fact it's usually the opposite, since you make more power as the RPMs rise, thereby reducing the amount of work the engine has to do to keep the car moving. So as long as the engine isn't struggling, you can leave it in 6th gear, but if you go up a hill, downshift so that you're in the higher RPMs and making more power, so the engine doesn't have to work to keep you moving. Avoiding the use of the supercharger will keep the heat down in the cylinders, relatively speaking.
FYI, the Hess on Portion road in Ronkonkoma had 93 today.
I may be mistaken but I believe premium fuel is suggested. Your car should run fine on 87. The computer will retard the timing before the engine knocks. I probably would not get into boost a ton but I don't think you HAVE to use premium.
I don't. Think there is that much hoarding of gas. People still don't have power and a lot on the south shore just got it back a few days ago. My point is, they are not only buying gas for their cars but for generators too so their is an increased need for gasoline. If they were hoarding it was in case their power went out again during the noreaster. Do you blame them for that? Also a lot of gas stations are closed which will cause lines at the few that are open and most of the ones that are open have a $40 limit so people have to go back more often. That is what a useless inept government does. They can't do their job so they blame the people.
Thats my rant for the day
Mike O2z is correct. The computer retards timing if it sees a knock event. There is no harm in using 87 octane. I have 80K miles on my 2010 V2 M6 and all but 12K miles have been on 87 octane. I have never heard it ping. The car runs great.
Now if I knew I was going to have some full throttle bursts or take it to the track, yes, I would fill with 93 octane. But 85% of my driving is on the highway with the cruise control on. It's a non-issue.
They are rationing now in NY/Long Island. Even plates on even days and odd plates on odd days. No limit on containers tho, so if the line is short enough just keep filling the car and going back...
That's... not really entirely correct. The octane suggestions are there for a reason, and it's not because GM is trying to screw you out of more money. This is a high performance car with a forced induction engine, not a Sentra. The car was tuned by GM to run on a MINIMUM of 91 octane. Running anything less than that causes the ECU to pull timing and at the point your car isn't running as well as it should be. Sure it's possible to run on 87 octane and not have detonation, if the conditions all line up. Cooler climate, no heat soak, no load on the engine, that sort of thing. But the ECU is still pulling timing at that point, even if it's not pinging.
In the OP's case, if he's forced to use 87 yes the car will survive if he drives it gently. That should be fine. That's different than using 87 for the span of the car's life. When you say "the car runs great", have you put it on a dyno to verify that? Have you checked to see how much timing has been pulled? I'm guessing your car is in a constant state of power loss because on 87 the ECU has to pull timing to prevent detonation. Your throttle response is not as good as it should be because of the retarded ignition timing and you're down horsepower.
If you want to cripple your car by running 87 all the time, that your choice - but DO NOT tell people it's "fine" or that there is "no harm" in doing it. That's bullshit. In a hot climate, an environment with a lot of hills or anything that adds heat to the cylinders, the ECU will not be able to retard timing enough to prevent detonation on 87 octane. Furthermore, light pinging is inaudible, so saying you can't hear it ping is irrelevant. You've probably been damaging your piston crowns the entire time you've been running 87, even if it's only light damage.
Why you would spend $70k on a super high performance car just to put 87 in it and cripple performance is beyond me, but it's your money. But you need to stop telling people there is "no harm" in using 87, because that's wrong. I live in the desert, what do you think would happen if I used 87 out here? It gets so hot out here I get heat soak just driving on the freeway, the ECU pulls timing even on 91 octane. And the CTS-V is more forgiving than a lot of higher-strung FI cars.
As I've said if you take it easy and you don't live in an oven, running 87 will work if you keep the engine load low. That is absolutely not the same thing as saying it's fine to use 87, or that there's no harm in using it. And besides, what are you saving, maybe $4 per fillup by using 87 instead of premium? You're gonna buy a $70k super high performance car and then try to save $4 per tank by using 87 which reduces power and throttle response and possibly causes detonation? To save $4? A cup of coffee at Starbucks costs more than that. You could have saved a whole lot more money by buying a Prius instead of a CTS-V, and THAT car is fine on 87. IMO the only conceivably acceptable reason to use 87 is for something like the OP's case where he can't find anything better and doesn't have a choice.
You might also give the smaller airports a call (Republic, Islip, Hamptons)....anybody who fuels up Cessnas might be willing to sell you some of their 100 octane avgas.....mix it with a few gallons of 87 and you will be in fine shape. Well...should be in fine shape. I can't envision a situation where the higher octane could cause any harm......and I am confident that anyone with a differing opinion will speak up.
Or you could drive down to VA with a boatload of gas cans...I just filled up with Premium for $3.46 per gallon......
Look into Torco Accelerator. I been running it in my motor in place of race file for higher boost levels for years now. Fyi, Normal auto store octane boosters only raises octane a few points, points are tents of an octane.
Right from page 9-47 of the manual...
"If the vehicle has the 6.2L V8 engine
(VIN Code P), use premium
unleaded gasoline with a posted
octane rating of 91 or higher. For
best performance, use premium
unleaded gasoline with a posted
octane rating of 93. In an
emergency, you can use regular
unleaded gasoline with an octane
rating of 87 or higher. If 87 octane
fuel is used, do not perform any
aggressive driving maneuvers such
as wide open throttle applications."
So yes, you can use it to get out of town to find 91 or 93 but I would not suggest running it all the time.
Thanks for all of the responses. I was able to get 93 octane today. Lines are getting shorter.
It is fine and it's not bullshit. Yes, I'm giving up power. So what? Who needs 556+ HP to drive highway speeds with the cruise on. I certainly don't need 93 octane because I'm not running any boost. As I mentioned, if I was going to use boost, I would use 93 octane.
Get your facts straight and don't attempt to correct and/or over analyze what you don't understand.
As Mike02z posted above directly from the manual, it is NOT fine and it IS bullshit. Stop living in denial. It doesn't mean running 87 is going to blow up your engine - although in the right conditions it certainly can - but there is a lot more to it than that. Pulling timing constantly means the ECU is fighting its programming every time you take it out. There are a number of good reasons Cadillac tells you not to use 87 except in the case of an emergency, and I've listed a number of them. One of the biggest factors you're ignoring is the environment, i.e. 87 might not blow up your engine, but it might blow up mine, since I live in a more inhospitable climate. One size does not fit all, which is why Cadillac tells you to run a minimum of 91. This is the main reason you should not be telling people 87 is "fine".
There are plenty more reasons, I've been over them already. Bottom line, just because you want to save $4 a tank and cause your ECU to retard timing and lose performance doesn't mean you should be telling anybody else to do it. If you want to screw up your car, keep it to yourself.
I think you are missing the point. The OP was asking because there is a gas shortage in NY and he could not find premium gas. This is his daily driver and be was looking for opinions. It had NOTHING to do with saving money. Nobody is recommitting it but, with no other choice, and if you 'baby' the engine, it should be ok for the short term so he can make it to work. Would you agree to that?