What octane do you run?

"While I agree with you....I'll add 2 things. #1 At one point early on Toyota mentioned in the manual for the 4.0 that "for increased performance use a higher octane"."

Can you provide proof of this claim? And if it is true, there is a reason they no longer do.

"#2 Some premium fuels like Shell V-Power have additional detergent additives that go well beyond the minimum requirements."

Marketing tool from the petroleum company, nothing more.

 

"This is not necessarily true. I'm not sometime who spouts the recommendation that people use higher octane fuel than recommended, and I would even argue that the benefit is not worth the cost in most vehicles that do benefit from higher than 87 octane fuel, but there are (small) benefits for many modern EFI based engines."

No there's not.

"Understanding how the knock correction and base ignition timing, advance igniting timing and/or total ignition timing is determined is key to understanding why higher octane can potentially improve tq and fuel efficiency."

Wrong. Not on a factory tune.

"Another thing, while higher octane rated fuel may burn more slowly than lower octane rated fuel, the difference in rate of burn is negligible and has little to do with why it's good for engines that need it. The higher auto ignition temperature and flashpoint and overall higher resistance to ignition is why it's able to better prevent preignition, detonation/knock. The propagation speed of the flame front is such a small difference compared to things like cylinder pressure, fuel ratio, etc which effect flame propagation speed to a much greater extent."

Wrong again. On a set timing curve, and a known non-changing compression ratio, you will NEVER get any benifit from running a higher octane the factory recommend.

 

"Supercharger requires premium... :/"

Not true, but mostly applicable because of increased induction, but one could easily build an 87 octane forced induction engine.

 

"I've got a supercharger and I put 93 in it. Otherwise I'd be running 87."

Higher octane has nothing to do with a super charger, rather the increase compression ratio (resulting from the forced induction) it allows them to add more timing (increasing preference) while elimination knock (ping).

Why do you think they offer race gas for race engines? Its so the build can run much higher compression, and add more timing for higher HP and torque, with out detonation. (knock/ping)

Not only am I an engineer, I also build performance engines (mostly for boats).

 

i run 93. 87 runs like crap. it runs great on 91 but 93 is only 2 cents more than 91 in my area so might as well get 93.

 

yes, use 87 or better. so 87 is not god.

 

I typically run 87 in mine. This is the first vehicle I have owned where I can actually tell the difference between 87 and 93. The truck wakes right up with 93.

 

"i run 93. 87 runs like crap."

No it doesnt, all in your head.

 

"The truck wakes right up with 93."

Has anybody read any of this thread? You can NOT, and will NOT get increased performance (Power/torque/increased mileage) using higher rated octane from the factory, on a factory tune, period.

Wow.

 

Wrong sir! Period!

 

I see this thread has been resurrected. It is Friday, so let's put this shitshow in overdrive.

In fact, let's supercharge the shitshow using 93 octane because using 93 octane on a F/I application that requires 93 octane has "nothing to do with a supercharger" but has everything to do with what a supercharger does and needs to run effectively.

Heeyuck.

 

These threads on Octane and various fuels seem to come up every few months and are full of claims with no evidence to back it up. I prefer to get my information from more reliable sources than some self-professed expert on TW. Here’s a few posts I made in previous threads. Do your own research away from TW, make your own observations, and decide for yourself what fuel to run. I’ve made my decision, I prefer Shell 89 Octane primarily for engine cleaning additives, and it’s not up for debate, at least not with me.
https://www.tacomaworld.com/threads/how-is-your-fuel-millage.642958/page-4#post-22263113

https://www.tacomaworld.com/threads/how-is-your-fuel-millage.642958/page-5#post-22297089

https://www.tacomaworld.com/threads/how-is-your-fuel-millage.642958/page-7#post-22338257

 

Really? I have vast experience in the petroleum industry as a chemical engineer, and build race engines for boats. I know how to build the most powerful engine based on the cubic inches and compression ratio I need to run on pump gas (97-98 octane). I know what ring gaps I need for forced induction, and nitrous applications, as well as tolerance specs, and strengths of the bottom end, and know everything there is to know about camshafts/valve trains to get to those goals. I can degree a camshaft in my sleep.

Listen up sport, there is absolutely no more energy (power) in a gallon of 87 octane, than there is in a gallon of 98 octane, period.

So, please provide a viable link to support your claim I am wrong, and your credentials as a builder.

Ill wait.

 

Jet fuel for me after installing this yesterday

 

no one cares about your BS degrees, stop posting about it. You sound like every other half assed engineer who comes on a forum and spew BS from their mouth.

 

$3?!?! Damn, what is it..2007

 

So you have no proof of your claim, thought so. The only BS here is your ignorance to the subject. Take care.

 

As a Professional Engineer who has at times proven myself wrong, or had others prove me wrong, I concur with this assessment. Carry on.

 

even during the lowest of covid prices i think i MIGHT of saw 2.25 once, been steadily 3-350 for years
https://www.gasbuddy.com/gaspricemap?lat=38.822395&lng=-96.591588&z=4

 

Guy is a total internet clown.... I wouldn't trust him to rebuild my 5hp push lawnmower engine.