Your computer is smart enough to limit boost and timing.
Your computer is smart enough to limit boost and timing.
alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.
I wouldn't count on it.
On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range.
I know this from doing data logs through the OBD-II port and watching IAM and knock control.
Tyler H wrote: In other news, I filled up a boat from a 5 gallon can the other day with one of these. It's just a marble (literally a cat's eye glass marble) loose inside a brass fitting and a piece of hose. Gave it 5 or six shakes and it siphoned the gas. Blew my mind...how did I not know these were a thing, and why don't I own one? Shaker Siphon
Brilliant. I didn't know these existed either, thanks for sharing.
z31maniac wrote:alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.I wouldn't count on it. On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range. I know this from doing data logs through the OBD-II port and watching IAM and knock control.
Wouldn't the difference be an NA hi comp motor vs a low comp FI motor? I would think staying out of high boost you should be good.
z31maniac wrote:alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.I wouldn't count on it. On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range. I know this from doing data logs through the OBD-II port and watching IAM and knock control.
All that tells me is that Toyota and Subaru are fools. And for such a "drivers car" they don't really understand their customer all that well. Which is kind of surprising.
One note- for that kind of car, it's possible that an outside firm did the work. That happens all the time. But it's still signed off by the OEM.
This isn't that difficult of technology to implement and calibrate.
alfadriver wrote:z31maniac wrote:All that tells me is that Toyota and Subaru are fools. And for such a "drivers car" they don't really understand their customer all that well. Which is kind of surprising. One note- for that kind of car, it's possible that an outside firm did the work. That happens all the time. But it's still signed off by the OEM. This isn't that difficult of technology to implement and calibrate.alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.I wouldn't count on it. On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range. I know this from doing data logs through the OBD-II port and watching IAM and knock control.
You wouldn't think so.
But it seems to be fairly well known in the Subaru community (including the WRX and STi) that many aftermarket tunes, not only make better power, but are much safer because they don't knock like crazy.
With my aftermarket tune on my car (and not even a dyno tune, just an Off the Shelf tune).....the IAM is consistently at 1 and only very, very rarely does it ever have to dial out any timing for knock. Occasionally 1-2° retard for a split second.
z31maniac wrote:alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.I wouldn't count on it. On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range. I know this from doing data logs through the OBD-II port and watching IAM and knock control.
Stock and on 91? Damn.
Stock motor will be fine run a few gallons out of it gentle and then fill it up with some high octane stuff to give your self some piece of mind.
Non stock boost levels or turbo upgrades, drain the tank.
keethrax wrote: Stock and on 91? Damn.
I did a mental double-take when Eric Adams mentioned he had a "91 octane de-tune" on his FR-S.
I wouldn't count on a turbo engine being safe on low octane out of boost. Who knows what Mitsubishi did with cam timing and ignition timing and fuel tuning in order to squeak the max economy out of the little piggy...
keethrax wrote:z31maniac wrote:Stock and on 91? Damn.alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.I wouldn't count on it. On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range. I know this from doing data logs through the OBD-II port and watching IAM and knock control.
12.5:1 Compression stock.
And the new Miata is 13:1 !!
In reply to z31maniac:
DI allows some really interesting things.
the car will be fine. My damn 2007 Rav 4 knocks like hell on regular fuel on a light throttle. Apparently this is a design feature, according to Toyota. Also. It's been doing it for 80K miles.. That engine is a honey badger.
Fueled by Caffeine wrote: the car will be fine. My damn 2007 Rav 4 knocks like hell on regular fuel on a light throttle. Apparently this is a design feature, according to Toyota. Also. It's been doing it for 80K miles.. That engine is a honey badger.
Light throttle knock and WOT-boost knock are very different animals.
found this on an Evo forum: http://www.socalevo.net/threads/151294-Help!!!!-I-Accidently-put-87-oct-in-my-evo!
You need about little more than 3 gallons of 100oct to get it up to 91oct.
My sister filled her '73 Beetle with diesel then kept filling with regular to dilute it all out. To this day I'm not sure how that would work but I miss that stupid car.
Datsun310Guy wrote: My sister filled her '73 Beetle with diesel then kept filling with regular to dilute it all out. To this day I'm not sure how that would work but I miss that stupid car.
Old carbureted engines care a lot less about the details of the fuel than modern cars do. :)
In reply to codrus:
Especially engines with like 6:1 compression.
z31maniac wrote:keethrax wrote:12.5:1 Compression stock. And the new Miata is 13:1 !!z31maniac wrote:Stock and on 91? Damn.alfadriver wrote: In reply to z31maniac: I'm sure there is. But if Mitsu didn't at least set that to regular pump fuel, they are fools. This isn't the first or last time that someone will put regular fuel into the Evo. Some of the other times will be totally intentional.I wouldn't count on it. On 91 with the stock tune, the BRZ still knocks like a door to door salesman especially in the 2000-4000 range. I know this from doing data logs through the OBD-II port and watching IAM and knock control.
Other than the airport, I don't know the closest place to even get higher than 91 from here.
Just drive slowly out of boost and fill up with fresh premium after you have burned enough to matter. Some say xylene is a hell of an octane booster but ymmv. beware off the shelf octane boosters that "raise octane 14 points!" Thats 1.4 normal points so 87 is now 88.4, not really worth it. If it was me id just burn it lightly, if i was worried id siphon it but modern tanks/filler tubes have anti siphon "valves" so you have to use a smaller hose
In reply to keethrax:
No idea on unleaded but a Sunoco 110 leaded pump is pretty easy to find.
http://www.sunocoracefuels.com/fuel-finder
Wow, so much panic and hysteria. Thought I was watching the debate...
Stay out of boost, you can do that, right? If so, your car will be fine.
If you are prone to those "forgetfull" moments, drain it now. You will forget to stay off the boost and destroy your engine!
Just kidding, you will be OK.
87 is extremely corrossive to Evo10 fuel systems, chassis rails, major suspension componenents and brake hardware. You need to get it out of the tank as quickly as possible. I recommend repeated full throttle blasts to redline with lots of left foot braking.
(I am kidding.)
From one Evo X owner to another, stay out of boost and you should be OK. Even then, the X guzzles petrol like Homer downs Duff and it has a fuel thimble in place of a fuel tank, so it won't take long to empty the 87 octane. 
The minimum octane ratings in Japan are higher than in the US, which may explain why the BRZ/86 ECU doesn't account for pisswater Cali 91 and lower-octane fuels. Not that they SHOULDN'T have accounted for this...
I am the original poster. This may have been much ado and paranoia about nothing; I appreciate all the responses. I found 5 gallons of Sunoco 104 octane (“260 GT plus”) in a can. I drove 80 miles off boost and then threw 3 gallons of NASCAR juice in there. Will replace more as I drive. Seems like a winner.
An update for the search engine, Things I think I learned:
there is no drain plug on the Evo X tank
the anti-siphon things in the filler neck do just that.
I did RTFM. Factory manual states that “in case premium grade unleaded gasoline 93 [(MON+RON/2] is not available, 91 can be used; however the performance level is reduced…” If premium grade unleaded gasoline is not available on journey, etc., regular 87 octane can be used temporarily as an emergency measure.”
Evo forum community is split on whether the 2015 factory tune is self-destructive or not. discussions on tuning seem to bring out certain cult-like groupthink behaviors. I am not educated enough on turbocharging to know whether this is legitimate or not. One tuner went so far as to offer a free map for the stock components as a kind of public service to prevent destroyed engines (see here: http://www.evolutionm.net/forums/evo-x-engine-management-tuning-forums/723299-fe-evo-too-lean.html)
Some people swear by Torco as an octane additive (mostly Corvette/mustang people). Public opinion is that this is likely at least partly "MMT" from looking at the MSDS
Lucas octane additive contains the same MMT additive, but in an insignificant amount (may add 1 pt by MON+RON/2 AKI type index?)
MMT works to some degree but is hard on plugs and O2 sensors
Sunoco high octane stuff is available, and station map is on www.racegas.com
can of magical NASCAR juice (can states 104 octane, "contains toluene"):
There's a lot of words here and I still don't know if the Evo blew up yet.
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