Premium vs regular fuels

[finch1750]

Why is this thread so long...

[KR-S]

Originally Posted by finch1750

Why is this thread so long...

It's only long because of the misinformation and everyone rebutting said misinformation and making jokes about it along the way.

[mdm]

Originally Posted by Big D Design

You guys are rough on me though, I'm 59 and you should show some respect for your elders.

Speaking just for me, I wasn't rough on you, nor I disprespected you. I just see no reason to take anyone's word for truth, even if they are firm believers (probably less so in such case). Unless they can support their claims with properly collected evidence and logic. Age has nothing to do it. And I am not that young either.

If anything, I find making claims without any support and demanding that others believe you just because you are 59 and you say so, more disrespectful than asking for evidence or explanation.


Oh, and I am still curious what a lubricant added to fuel is supposed to lubricate.

[FRSBRZGT86FAN]

Originally Posted by Big D Design

I concede. I'm done talking about Octane Booster. I have never put any in my FRS or Stage 3 Roush. 93 V-Power is just fine where I live. I knew there would be a stink created, but my JDM Nissan engine ran so much better with it. It wanted the boost and I was very happy to spend the extra money.

You guys are rough on me though, I'm 59 and you should show some respect for your elders. Also, if you were in the same room with me... I think you would use your words wisely. I will go back to my shop and brush off the hurt some of you inflicted and get over it. At least in my mind I had fun with octane boost. This is the last that I will mention the subject.

Most of us don't even know your age or care and we weren't being rough on you. We simply don't trust snake oil with no evidential proof.

[Toyarzee]

Lol @ the back end of this thread. I kept avoiding after the first page but it keeps getting bumped. Finally read through and now this is all I can think of.

[humfrz]

Originally Posted by Big D Design

.............
You guys are rough on me though, I'm 59 and you should show some respect for your elders. Also, if you were in the same room with me... I think you would use your words wisely. I will go back to my shop and brush off the hurt some of you inflicted and get over it. At least in my mind I had fun with octane boost. This is the last that I will mention the subject.

@Big D Design

Well, now, old timer, I hope you don't go away "butt hurt", as some of the youngsters on here would say.

Back-in-the-day, our generation would usually take the word of the old time mechanics as "truth". But, back then, things (auto knowledge) didn't change that fast. For example, there wasn't a hell of a lot of difference in the way a Model A Ford engine worked ...... than a 1950 automobile engine worked.

Plus, the choices were fewer (simpler); detergent or non-detergent oil; alcohol or Prestone anti-freeze; Champion or AC spark plugs; leaded or non-leaded, high-test or regular gasoline.

A timing light, dwell meter, feeler gauge, a screwdriver, a pair of pliers, a ½ & 9/16 wrench was all that was needed to tune up an engine. Throw in a ¾” wrench and you could overhaul an engine.

Knowledge of “how to do it” was either from the older mechanic or tattered and torn, grease smudged maintenance manual (if you could find it - thrown behind the shelf, under the mechanics bench). Today, the Internet is full of information – so EVERYBODY can be an “expert” without ever getting their hands greasy.

So, where do us old, shade tree mechanics fit it ……. ?? Very carefully ……

For example, you may have noted, that I preface many of my comments and suggestions with phrases like “back in the day” and "it’s my understanding that", or "it's been my experience" ……etc.

So, us old guys got to stick together if we are going to keep the young-ens in line. After all, we know how to tune an old engine with our ears ……. if they lose power on their laptop computer ….. their car is nothing but a worthless hunk of junk.




humfrz

[RichardsFRS]

Originally Posted by Big D Design

I concede. I'm done talking about Octane Booster. I have never put any in my FRS or Stage 3 Roush. 93 V-Power is just fine where I live. I knew there would be a stink created, but my JDM Nissan engine ran so much better with it. It wanted the boost and I was very happy to spend the extra money.

You guys are rough on me though, I'm 59 and you should show some respect for your elders. Also, if you were in the same room with me... I think you would use your words wisely. I will go back to my shop and brush off the hurt some of you inflicted and get over it. At least in my mind I had fun with octane boost. This is the last that I will mention the subject.

Man get over it, they're still young padawans swinging junior light sabres. They will be old to like us and they will say damn kids won't listen and think they know everything. Like our parents did lol

[Zhangy]

Originally Posted by Tcoat

The bolded I agree with 100%.
The rest of it is bunk.

Calm down about low octane gas on this cheap sports car, you need to have some faith with modern technology. You lose some horsepower that's about it. Ecoboost mustang with 10:1 compression runs perfectly fine on regular, it is 306hp on 93 but goes down to 260hp on 87.

[Zhangy]

Originally Posted by FRSBRZGT86FAN

They still knock dangerously on the stock tune with anything under 91 if you get into boost. Higher Octane is required in cars with high compression because under high compression the lower octane fuel will combust before TDC, this is "knock"(our FA20). In order for the car to adjust for itthe knock has to occur and it has to adjust and attempt to predict it after the knock occurs for the next knock. That is where the extra wear will occur, in fact it happened to people's di seals in early tunes and FA20s.


However, the GT500s have pretty low compression due to the super charger (I think its less than 9:1). They require high octane because of the supercharger. As long as the sc is not putting boost into the engine, the compression of air should be the factory 9.1:1; this does not require special fuel. But when the boost is applied, even slight throttle, you end up with 16-18psi sitting in the chamber at BDC Bottom dead center
then you compress it by 8.4:1, and you end up with a really high pressure - this requires high octane so it doesn't ignite itself too early. This is a similar issue to the FRS.

The sheer higher compression can cause the pre-ignition, engines with similar compression like skyactiv and such got away with lower octane by cooling exhaust gases quickly and such but the result is less power. The FRS however has some equal length headers and 4 injectors per cylinder etc etc to get us that 200 hp or 100hp per liter...

Yes, we all need to calm down about low octane gas on this cheap sports car.

http://www.autoblog.com/2015/01/05/2...-on-87-octane/

Ecoboost mustang with 10:1 compression runs perfectly fine on regular, it is 310hp on 93 but goes down to 275hp on 87.

GUESS WHAT mustang says Requires 93-octane premium fuel... have faith in anti-knock technology

[FRSBRZGT86FAN]

Originally Posted by Zhangy

Yes, we all need to calm down about low octane gas on this cheap sports car.

Ecoboost mustang with 10:1 compression runs perfectly fine on regular, it is 310hp on 93 but goes down to 275hp on 87.

GUESS WHAT mustang says Requires 93-octane premium fuel.

Originally Posted by Zhangy

Calm down about low octane gas on this cheap sports car, you need to have some faith with modern technology. You lose some horsepower that's about it. Ecoboost mustang with 10:1 compression runs perfectly fine on regular, it is 306hp on 93 but goes down to 260hp on 87.

The ecoboost is no N/A FR-S it's a turbo motor, in the ecoboost people have already noticing issues with LSPI. That's reason enough to not use 87, especially with ford rushing out tsbs with different tunes to fix it.

[Zhangy]

Originally Posted by Tcoat

Please provide source for this. I am very curious as to who made this "rule".

https://books.google.ca/books?id=afY...octane&f=false

https://www.google.ca/search?q=inter...+%2B+standards

There are internal combustion engine design standards which must takes into account of fuel octane volatility and knock management. I've only read it briefly, but I assume 87 octane satisfies internal combustion engine design standards. because sometimes the 91 octane you buy will be like ~88 octane anyways

[Tcoat]

Originally Posted by Zhangy

https://books.google.ca/books?id=afY...octane&f=false

https://www.google.ca/search?q=inter...+%2B+standards

There are internal combustion engine design standards which must takes into account of fuel octane volatility and knock management. I've only read it briefly, but I assume 87 octane satisfies internal combustion engine design standards. because sometimes the 91 octane you buy will be like ~88 octane anyways

LOL The very first complete sentence of the material you provided debunks you theory completely!

[HunterGreene]

Originally Posted by CatScan

A lawyer made the decision regarding octane, not an engineer.

Because lawyers build and design engines. Trust me, if anything, the Lawyers try to relax safety margins instead of reinforce them. An educated, intelligent engineer gets very nervous when you start approaching safety tolerances...because they know what can happen.

smh @ this thread.

[KR-S]

This shit again?