What octane do you run?

My favorite boat engine build, twin Duramax's with twin turbos on each one

https://youtu.be/Jf0mTGu0aA0

 

Well I was talking about engineers in general, we can all be wrong, lol.

 

What boat engine builder do you work for? Its a pretty tight knit community. I know a few people into the big HP boat scene off the long island sound. Who do you work form to make sure big claims in engine building?

 

Except you're wrong about some of your conclusions that have zero basis, so I would save my bets if I were you.

Kudos on you for doing due diligence on exerting the effort to learn an educate yourself though.

Doing what, exactly?

A telltale sign of an astute engineer.

Can't drink your own kool-aid.

 

I can tell you for a fact that the factory ECM does knock correction and adaptive timing learning. All easily tunable and very easily seen in the HPTuner software.

 

Its not about being right or wrong, its about physics, and PROVEN chemical knowns, and PROVEN engine building techniques.

So Ill ask you too Mr. Engineer, can you prove me wrong?

 

Yes, it does, but with the *factory* tune and compression ratio, the timing curve is static *UNLESS* it detects knock, then the ECU will remove timing. Remember, we are talking about factory tunes on stock engines, yes you can load a tune that has a different timing curve to actually gain power by running on higher octane, that is not what is being debated.

 

So your saying the truck never pull timing then? Very Wrong.

 

Uh no. KCL raises when it doesnt detect knock and will move timing up from the base map regardless of how you have your tune setup, even factory

 

Hes saying the trucks will only pull timing, not adaptively raise it. See above

 

Here’s an idea, how about some of you bullshitters, and you know who you are, provide links to reputable sources that prove your claims? I provided links to my posts with links to some factual sources that I made my personal decision on regarding fuel to run, make no grandiose “prove me wrong” claims. How about proving your claims are right? With links to good sources? Where’s the link! (to the tone of “where’s the beef!” lol).

 

Oh this should be good.

Even when called out by name, educated and correct responses are not forthcoming.

 

I'll get into this shitshow because I've been in this area for 35+ years. Every engine builder of any recognition will tell you the same thing - premium makes no more HP than regular with all other things being equal. <--- Make note of that before commenting.

On a N/A engine premium allows more ignition timing which can add a little more HP. Does the engine have knock sensors and can the factory tune provide more timing with sensor feedback? On a forced induction engine premium resists detonation and, as with a N/A engine, can allow more ignition timing which again can allow more HP. Does that engine have knock sensors to allow for more timing? I don't suspect most of you will know these names, but look up articles by these esteemed engine builders:

Gale Banks
Steve Brule
Brad Anderson
Steve Schmidt
Jason Line

If that's too much work for you, here's a few that corroborate this info:

https://www.caranddriver.com/features/a28565486/honda-cr-v-vs-bmw-m5-ford-f-150-dodge-charger/

https://www.amsoil.com/newsstand/articles/high-octane-gas-boost-performance/

https://www.aaa.com/autorepair/articles/don't-confuse-gasoline-octane-and-quality

https://nasaspeed.news/tech/engine/...-the-debate-over-which-fuel-makes-more-power/

https://www.hotrod.com/articles/0901phr-difference-between-pump-race-gas/

https://www.hemmings.com/stories/2014/04/11/tech-101-octane-the-facts-and-the-fiction-behind-those-higher-priced-fuels#:~:text=Octane does not offer any,make the engine start quicker.&text=Because higher octane gas burns,also factor into cylinder pressures.

End result - if your engine cannot take advantage of the higher octane - through (1) adaptive timing; or (2) supercharging and a custom tune, then higher octane not only does not provide more hp or mpg, it can actually hurt it.

How exactly do you think a pedestrian 6 cylinder truck engine will benefit from this?

I've thrown my cards on the table. Show me evidence that higher octane gasoline provides more HP and/or more MPG with all other things being equal.

 

No, Im not saying that...it can add, OR remove timing. There is a static tune for timing in the ECM, based on many inputs (sensors) and conditions, however, most manufacturers have knock sensors, that will insert a loop into that tune, to alter the timing based on sensing knock.

Im done with all these ignorant "armchair experts" who obviously know nothing about octane, what it does, and how or where its applicable. I
*KNOW* what Im talking about, and I *KNOW* Im right, but Im done here.

And no, Im not going to waste my time providing links and resources, I am not a teacher.

All you guys who want to waste your money on a higher than recommended octane, that has *ZERO* benefits to a stock engine, on a factory tune, have at it. [thumbs up]

Buh bye.

 

Correct, bc of the slower burn. But save it man...waaaaay too many Kool-Aid drinkers here.

 

I'm not sure the exact arguement with octane, but some say higher octane produces more hp and torque at lower rpm.

https://en.m.wikipedia.org/wiki/Toyota_GR_engine

"The 1GR-FE is the 4.0 L (3,956 cc) version, designed for longitudinal mounting in RWD and 4WD pickup applications. It has a bore and a stroke of 94 mm × 95 mm (3.70 in × 3.74 in). Output is 236 hp (176 kW; 239 PS) at 5200 rpm with 266 lb⋅ft (361 N⋅m) of torque at 4000 rpm on 87 octane, and 240 hp (179 kW; 243 PS) at 5200 rpm with 278 lb⋅ft (377 N⋅m) at 3700 rpm on 91 octane. This engine features Toyota's VVT-i, variable valve timing system on the intake cam and a compression ratio of 10.0:1. Service weight, including fluids, is 166 kg (366 lb)."

 

l

which “conclusions” do you think I was wrong about? My choice of gasoline? I don’t think I made any “conclusion” other than the gas I chose. I’m always open for better information.

 

The 1GR in our Tacos is sort of a simple version. The 1GR in the FJ Cruiser (last couple years of production) had Dual VVTi and I think could take advantage of premium gas.

 

I'm at 7000 feet so I just run regular. Everything else is just wasted money