What gas are you pouring in your 16?

Just venturing a guess, the truck will run better.

 

oh, now that is just silly. Now we need to define Better....lol.

As stated, the ECU will detect knock and adjust the fuel table appropriately. Can you run anything from 87-91. Yes you can. Is it "better" maybe, depends on the weather, roads, driving conditions, etc. Will I see benefit of 91 octane in a DD sitting in traffic and moving 5 mph for 20 minutes a day..probably not. Will I see improved efficiently cruising on the interstate at 70 mph.. probably.

 

I don't know about you, but I can tell when the vehicle runs with more gusto, especially pulling hills. The mpg difference isn't enormous, but it's enough to justify the 10 cents more per gallon(for me anyway)

 

I am going to take the high road and dispense with the insult and name calling but.you are suddently changing the subject.....My response was to a poster who claimed his ran better on 91. If it was designed for 91 OF COURSE it will run better, Case closed...
.
But That's not what you claimed. You said "ECU can compensate by advancing the timing. Compensate for what? I have to assume you meant 87. Because a truck designed for 91 does not compensate for anything except lower octane fuel....It does not adjust the timing UNLESS on puts 87 in it. AND the truck knocks. At 91 octane the ECU does nothing. putting 93 in ....the ECU does nothing. Putting 98 in the ECU does nothing.

My question was

"How does a slower burning fuel in a cylinder deliver "better response" AND better MPGs?" with reference to the subject of putting 91 in a vehicle designed for 87

Here is your exact quote:
QUOTE="Hans Moleman, post: 10891469, member: 4505"]The ecu can compensate for increased octane by advancing the timing which increases power. [/QUOTE]

Again .... NO It cannot compensate for increased Octane only DECREASED octane. By your stated logic, putting 98 Octane in will really up the HP and MPGS

You implied a vehicles ECU will adjust for 91 octane in a vehicle designed for 87 hence better HP and MPG and that is simply false...Putting 91 ion a vehicle designed for 87 does nothing but waste money. The ECU does not advance , pass go or deliver $200. It does nothing at 91.......UNLESS the vehicle is designed for 91 and one puts 87 in it. THEn and only then with the ECU compensate to avoid pre ignition and then ONLY when pre ignition is sensed

Of course a Vehicle designed to run on 91 will run on 87. Only Then does the ECU make adjustments...and only if the knock sensors tell it to .

The ONLY thing Octane does is prevent pre ignition. That is what it is designed to do. Burn slower. nothing more or less. There is zero benefit to running hi octane in a vehicle designed for 87. Seafoam is better for an engine than running slower burning fuel in a vehicel designed for faster burning fuel

Nice try though

 

No, your maze of circular reasoning is not going to work here. I never implied any engine designed for 87 will run better on 91. I was talking about the Tacoma engine which was designed to run on 87 to 91 octane (but optimal for 91) and ECU can adjust accordingly since this thread is about Tacoma engines. So yes I stand by what I said about the ECU being able to compensate for increased octane since we are talking about Tacomas here.

 

You are still wrong. The ECU does nothing when 91 octane is used in a vehicle designed for it. It does not tune itself as it is already tuned for 91. The ONLY time it re-tunes is IF a lower octane is used AND the knock sensors sense pre ignition. It does not tune UP to 91 . Its already there! Your assumption is based on running 87 in a 91 designed engine. no one mentioned doing that...if fact the opposite which is what I questioned.

you stated the "The ecu can compensate for increased octane by advancing the timing which increases power" which is patently false It compensates for DECREASED octane only and that has nothing to do with more power..if fact less.

by your stated logic of "increasing octane", Putting 93 octane in a vehicle designed for 91 will cause the ECU to retune "increasing power"......When in fact it has zero effect on the power or MPGs the ECU cannot tune itself to 93 octane it only tunes or changes the timing via knock sensors when the octane is too low. It does not increase power when a higher octane is used in a vehicle designed for it. It runs at factory spec.

 

lol, I see you are still trying because you can't face that you are completely wrong. Now you are trying to say I'm implying from going 91 to 93 octane

 

Are we talking gen2 or 3 here?

 

Sorry young pup, not sure which publication that is from but I am looking at the manual that has been floating around and on page 570 it says 87 (RON 91) or higher and on page 579 it says the same. The product information sheet from the Toyota website also specs 87 or higher but does not spec RON or not. Since the snapshot you posted does not spec RON or otherwise and the number in it (91) matches the RON spec in the other publications I would say they just left off the RON notation. Which publication is that from?

And FWIW I'd like to download whatever that publication is - trying to gather a complete set of stuff for my records regardless of what octane this thing uses so please post a link. I'll dig up the links to mine too.

 

Don't get him started...he is convinced the 16 requires 91..

 

Interesting that nobody has brought up the point that higher octane fuels have a slower flame front propagation and using a fuel with a higher octane rating than that required to prevent detonation can actually reduce performance. If your engine does not require high octane fuel, the lower octane fuel is the higher quality fuel (and it costs less). Using a higher octane fuel than required is a foolish waste of money.

 

Crank up the timing and you can make a lot more power on higher octane fuel though.

 

The optimum fuel will complete combustion by TDC or shortly after with ignition as late as possible to achieve this. Igniting a slower burning fuel earlier causes more pressure to be generated on the wrong side of TDC.

 

I just get ethanol free as often as possible and throw in some cleaner every so many thousand miles.

 

This thread is useless without links

 

i mentioned that very thing when a now ignored member indicated an the ECU will compensate for the higher octane buy changing the timing thus more powah.....and MPGs. I indicated an truck designed to run on 87 (2016 Tacoma) will not get more power or MPGs with a slower burning fuel. IF the truck was designed for 91 and one runs 87 the ECU WILL compensate for the faster burning fuel IF a knock is detected and then it WILL compensate for the lower octane delivering worst Power and less MPGs.

But he is the "expert" who knows how to read an Octane rating and claims higher octane means more power and MPGs in a 2016 Tacoma tuned to run at it's optimum at 87. This IS the 2016 forum isn't it?

If Toyota indicated one can get better fuel economy and power running higher octane than the recommended 87 I would..But as it is 87 is the optimum Unless or until someone manages to reflash the ECU

 

Butter, please

 

No links needed. I ran 12.4 with 93 and getting 2-4* of knock retard. Bump my octane to 100-101 by adding some 108 to the tank, and bump timing a couple degrees. Ran a very consistent 12.1-12.2. (not tacoma)

 

Yes but it says 87 or higher. They way it is worded the engine can support higher octanes.

Octane ratings are usually in (R+M)/2 for the US, unless otherwise specified.