Antman
Elite Member
My wife thinks my exhaust smells like roses... :humble:
What octane gas are you using for your T4R?
- Thread starter Biznitch15
- Start date
My wife thinks my exhaust smells like roses... :humble:
ST1FLER
Banned
Antman
Elite Member
BLACK-FL4RUNNER
Member
I am pleasantly surprised that only 20% of the people on here flush their money down the toilet with the higher priced octane fuel. I would of thought it would be higher....
:flamethrwoer2:
:flamethrwoer2:
wfo9
New member
I tried not to read this thread, but I clicked on it.... Seems like lots of misinformation.....
I guess it really depends on your priorities and how you drive... There is a noticeable difference in performance, although MPG will not change....
Here is some data. from wikipedia. Not sure how accurate it is, but seems legit to me. Octane does make a difference with modern ECUs and the timing advance. The learn cycle varies quite a bit, but it's pretty quick in most applications.
254 vs 285hp is nothing to scoff at.
1GRFE (non dual VVTI)
Output is 236 hp (176 kW) at 5200 rpm with 266 lb·ft (361 N·m) of torque at 4000 rpm on 87 octane, and 239 hp (178 kW) at 5200 rpm with 278 lb·ft (377 N·m) at 3700 rpm on 91 octane
Dual VVTI
output to 254 hp (189 kW) and 270 lb·ft (366 N·m) on 87 octane and 285 hp (213 kW) and 289 lb·ft (392 N·m) on 91 octane.
https://en.wikipedia.org/wiki/Toyota_GR_engine
another interesting data point from the wiki....
Toyota rates engines on 87 pump octane, Lexus rates engines on 91 pump octane. Hummmmmmmmmm
Last edited:
bloodninja
New member
So if we're under the assumption that simply switching to 91 octane will increase HP by nearly 30 and torque by nearly 20, wouldn't that imply that you're not gaining those figures, but rather not losing them? In other words, we're saying that the 5th Gen 4Runner engine is effectively, substantially detuned and retarded from the factory?
1engineer
Moderator
The documentation I read from Toyota regarding this says you will gradually gain in performance over several thousand miles on a steady diet of 91. You won't feel anything for several tanks and then it would be gradual so you wouldn't feel it anyway. Now you have to keep using 91 because if you switch back to 87 it will adapt to that fuel much quicker to keep from knocking. So now you switch back and you have the long learn time again.
Doing the math you are going to spend a couple grand to eventually get that performance. Worth it? Maybe for some but not for me.
wfo9
New member
Yes, It's clearly de-tuned.... The motor is capable of much more, but Toyota tunes it for long term reliability and warranty.... They also tune it to adapt to various conditions like the fuel octane... If you run really low octane fuel it will have to retard the timing dramatically. Same thing happens when running with really high intake air temps. There is built in curves that tell it to dial things back since it knows those higher temps will result in more potential pre-ignition.
The ECUs only mechanism for calculating the octane of the fuel is knock sensing.... These are not knocks that you will be able to hear, but the sensors can....
If you are just putting around at light throttle... you would never know any difference since the cylinder pressures and load will be low. But if you are towing or climbing....putting down some tq...you should be able to feel the difference.
If Toyota knew you were only going to run 105 octane... The MPG... and power could go up quite a bit, but since it has to run on all grades of fuel reliably... the static compression can't be all that high, so really no MPG gains with higher octane. Direct injection is what allows much higher effective octane and therefore higher static compression and efficiency.
Bottom line, if you are the type of person who puts on a performance filter or exhaust to attempt to squeeze out a little more power.. you would probably also want to run premium fuel. If you don't really care if the motor is putting out max potential... (it's a big slow pig anyway) just put the cheap stuff in. I don't put a lot of miles on mine (I have another DD), so I run the good stuff. I also blow money on all types of other useless stuff in my life that I don't really need. I've even been know to shop at whole foods from time to time ;-)
Last edited:
BumRunner
New member
wait wait wait...i thought whole foods meant whole sale prices? Thought i was getting a steal on that asparagus water a while back!
bloodninja
New member
No no no... whole foods means you're getting the entire foods, not just half the foods like with most grocery stores.
