What Octane will the SS be rated?

[tylermoore]

nitrous plus race gas!!!

[zebra]

Originally Posted by tylermoore

nitrous plus race gas!!!

that would be GREAT for a daily driver!

[CamaroSpike23]

Originally Posted by NewCar

The irony of all this is that the V6 which runs on regular 87 actually has a higher compression ratio than that of the v8 which runs on premium. If compression is the main issue, then I wonder why this is?

11.3:1 (v6)

10.7:1 (LS3)
10.4:1 (L99)

its not irony. its two different motor designs. the v-6 is Direct Injection, meaning the fuel is sprayed directly into the combustion chamber (much like that of a diesel) momentarily before the ignition sparks. this allows a higher c/r as the fuel also cools the air charge when it is sprayed into the cyl as well as allows for more accurate fueling as you dont have some fuel sitting in the intake runner/on the valve not making it into the combustion chamber.

Originally Posted by NewCar

so if it is so high pressure then why does it not need the higher octane to avoid knocking?

cus its DI. I would still run premium in it. but thats just me.

Originally Posted by NewCar

CamaroSpike23
a rough guide for Compression ratio vs Octane
5:1 67
6:1 75
7:1 82
8:1 87
9:1 91
10:1 93
11:1 95
12:1 103

and to add a note to this guide. it is for traditional n/a motors. I have not done much work with tuning DI motors (save for diesels)

Originally Posted by 69Firebird

The LS3 is sweet, but if they added DI it would be out of control. More power and better fuel economy.

thats what the Gen V motors are for.

Originally Posted by UsedTaHaveA68

Agreed. I don't understand why engines haven't been DI'd for years now. Diesels have always been direct injected (or at least for as long as I remember). I remember when Mercury Marine came out with DI in their outboard motors back in the mid '90s, but autos still aren't getting them. Why WOULDN'T they use something to increase the efficiency of an engine?

diesels have been DI'd since their conception. but its all about the workings of the different motors. Diesels work by way of the..... wait for it...... diesel cycle. while some have glow plugs, most often, they do not. and they operate by way of detonation. ya know.... the thing we are all worried about here. reason being is that diesel motors are built to run with a lot higher compression as well as the combustion cycle being triggered off of compression and heat instead of a spark plug like that of the Otto cycle.

they have been looking at DI gasoline for years now. but the thing to keep in mind is that, its never really been needed. as automotive consumers, we've told motor companies we want more power, we want more room, we want better mileage, and they have been more than happy to squeeze every little bit they can from the tried and true design of the small block v-8. not to mention that DI fuel injectors arent cheap....lol and one thing everyone needs to keep in mind is that V-8s of the traditional sense are going to be changing. Gen V motors will be making an appearance in vehicles soon. but motors will be going in a different direction in the future.

Originally Posted by tylermoore

nitrous plus race gas!!!

Originally Posted by zebra

that would be GREAT for a daily driver!

yeah... if you had the race gas as a stand alone fuel setup in addition to regular fuel. it would be about a waste to run on it full time.

[CamaroSpike23]

Originally Posted by NewCar

This article was helpful for me.

http://www.imakenews.com/tomballford...bFcFg,bcRJCqRP


and I do think it is a bit rude to tell people who are asking this question they do not need a performance car. There are several reasons for asking what will happen with 87 octane. For instance, if they plan on using recommended but run into a hard time financially unexpectedly, or if They like 400 hp more than 304 but can live with 400 instead of 422 (a decrease but still much better than the V6). Or more importantly, if they let their sister or father borrow the car and they don't even ask what grade it takes and just fill it up the way they will, The owner will want to know if these people will actually damage their car. I know my father would use 87 even if I told him not to. I am glad to know he will not actually damage my car if I buy the LS3. This is some peace of mind and a good reason to ask this question.

But the price difference per year really isn't that much considering if I drive 10k miles per year (and I do even commuting) then with a car that gets 13/20 (like the LS3 G8 GXP) say I average 17mpg, then with a 30 cent difference, that only equals a total yearly DIFFERENCE in cost of 176 dollars and forty seven cents. Thats far less than the difference in cost between the 26mpg v6 and the 20mpg v8 just due to fuel economy even if they both used 87.

that link is an interesting one... esp this part...

That’s good news, but what if your owner’s manual recommends Premium grade fuel? The key word is ‘recommends,’ which really means it’s okay to use Regular under most driving conditions. Virtually every expert – even those from oil companies and auto manufacturers – say that using Regular will not harm engines, but you’ll probably not get the ‘advertised’ performance. In other words, you may add a second to the zero-to-60 mph time a reviewer said you should expect from your car. Again, using Regular gas will not damage the modern engines of most of today’s cars.

the "advertised performance" isnt always just the 0-60, but also the MPG. regular gas wont (or at least shouldnt) damage modern engines. but it might not always save you $ at the pump. esp if you are having to fill up more often with the cheap stuff.

[zebra]

Originally Posted by CamaroSpike23

...yeah... if you had the race gas as a stand alone fuel setup in addition to regular fuel. it would be about a waste to run on it full time.

no. that's about the best you can ever get for a full-time setup. just think... every on-ramp - you punch it and hit the spray! i don't see how you wouldn't want that every day!

[CamaroSpike23]

Originally Posted by zebra

no. that's about the best you can ever get for a full-time setup. just think... every on-ramp - you punch it and hit the spray! i don't see how you wouldn't want that every day!

from a cost standpoint, if the vehicle isnt soley being used for racing, nor being built/tuned for the racing fuel, then you are just wasting your money. the reason I mentioned a stand alone fuel setup is because depending on the size and type of nitrous setup you are running, you will need additional fuel over what the stock injectors can put out. and if you are running a smaller tank of racing gas that will only be used during nitrous use, then it wont cost as much and will allow you to run a bigger shot more safely.

not to mention, I dont like the thought of having 100% of my power only 20% of the time. I like having it all the time. which is why im going FI.

[zebra]

you actuallly though i was serious, didn't you?!

[CamaroSpike23]

Originally Posted by zebra

you actuallly though i was serious, didn't you?!

[SummoneR]

Originally Posted by rayhawk

That is a myth. Flush out what part of your engine? Do you mean cleaning your injectors? Or something else? Any fuel will leave carbon deposits on your valves/combustion chamber, it is part of the combustion process. Some may be worse than others if you believe the advertising, but it is definitely not related to octane.

As to the recommended octane, if you really want to save the money and you always take it easy driving, you could use regular. But who buys a v8 camaro to baby it? I recommend premium, for an extra $5 a week to get the performance you paid for in the car seems worth it to me.

Ditto, I run Premium in my FJ, I log at least 600 miles a week in that thing and the difference in gas is what $7.50 a week...? worth it for sure! It's just a V6... a very good V6 but still if your getting a Camaro worth the extra cash in V8 or V6 form. Also if you buy your gas from a mom and pop store that buy their gas from some unknown suplier... you will most likely get dirty gas, I have owned 7 different vehicles in the last 10 years and have found that Chevron Premium actually works best for most of those vehicles, not that I am promoting CHevron, I'm just saying based on my observations I get the best performance from it.

Too studies have been done that have shown vehicles that start out running on say 87 octane and run it for a while adapt to it, then if you go and switch it up to 91 octane which may or may not be the recommended octane, it will actually run worse than what it would have had you started with that octane and vice versa... with the modern computers in the vehicles they adjust and learn based on your diving style and fuel etc... this drove me nuts with my 2003 GMC, the transmission was stated to "learn" my driving style, well problem with that is that my "style" changes on my mood and what I am listening to on the radio... so sometimes when I wanted to get on the throttle it would be confused thinking he is(me) putzing around town... other times Id start to take off from a light at a normal pace it would start out in a higher gear for a while then !*BAM*! it would decide to drop a gear or two and slam me head into the head rest while making a loud clank sound... anyway my point being, run the recommended and stick with it... you will get much better results it's like feeding a dog different dog food every time you go shopping for dog food, it leads to finicky eating... not good as most dog people know, same goes for your car, leads to finicky performance...

[domano 68]

Originally Posted by rayhawk

That is a myth. Flush out what part of your engine? Do you mean cleaning your injectors? Or something else? Any fuel will leave carbon deposits on your valves/combustion chamber, it is part of the combustion process. Some may be worse than others if you believe the advertising, but it is definitely not related to octane.

As to the recommended octane, if you really want to save the money and you always take it easy driving, you could use regular. But who buys a v8 camaro to baby it? I recommend premium, for an extra $5 a week to get the performance you paid for in the car seems worth it to me.

Well said.

[Speedfreak]

Originally Posted by Mr_Draco

Depends on where you live though. Here premium is $1.50 more then regular at the low end and now is as much as $2 more per gallon. Mid grade isn't much better running about $1 more then regular per gallon.

That makes no senses. Prem here cost .20 a gallon more...........

[Scott@Bjorn3D]

They just said it will run on regular but give better performance with premium. It is on the Camaro website.

[NewCar]

Thanks guys, I got it, sprays in at the last second, cooling effect, no chance for pre-ignition.

I did find an article saying that GM has tested a version of the LS3 with DI and they tested it in a Escalade SUV. It got 450 HP and 3-6% better mileage so Fuel Economy won't change much on this engine due to DI. It will be a GenV engine, and will obviously not be called LS3.

[NewCar]

That was an L92 actually with VVT and dual cam phasing