|
Scion FR-S / Toyota 86 GT86 General Forum The place to start for the Scion FR-S / Toyota 86 | GT86 |
![]() |
|
Thread Tools | Search this Thread |
![]() |
#15 | |
Senior Member
Join Date: Feb 2016
Drives: FR-S
Location: Right there.
Posts: 261
Thanks: 1
Thanked 187 Times in 107 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Let me try: To think that Toyota/Subaru designed this car WITHOUT considering that at some point some of them will HAVE to run on low-octane gas "every now and then" is idiotic. That's what the ECU is for. Then again, I'm ASSuming that the typical owner of a car will read the manual and understand what's going on. |
|
![]() |
![]() |
![]() |
#16 | |
Senior Member
Join Date: Mar 2014
Drives: '11 Cayman , '14 Camry, '11 Tacoma
Location: Eastern NC
Posts: 509
Thanks: 57
Thanked 396 Times in 198 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
Quote:
|
|
![]() |
![]() |
![]() |
#17 |
Senior Member
Join Date: Feb 2016
Drives: FR-S
Location: Right there.
Posts: 261
Thanks: 1
Thanked 187 Times in 107 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
|
![]() |
![]() |
![]() |
#18 | |||||||
Senior Member
Join Date: Jun 2013
Drives: 2023 GR SUPRA,15 FR-S (SOLD)
Location: Philadelphia, PA
Posts: 4,235
Thanks: 3,086
Thanked 2,100 Times in 1,397 Posts
Mentioned: 31 Post(s)
Tagged: 2 Thread(s)
|
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Quote:
Dude you're attacking everyone with fallacies ![]() ![]() In layman terms use 93 AKI/98 RON or higher, if you don't have that available you may use 91 but only if the higher grades are unavailable It does not mention 87 however, the assumption can be made the highest available average octane is 91 (U.S. and candian AKI I think canada uses it not sure) or 95 RON in other places. If you do put 87 you have to understand you're taking a longevity risk, why? Every time the car has to alter it's IAM (Ignition Advance Modifier) below 1 or that means knock is being detected and it is having to adjust to try and prevent another "knock event" (not sure if that's the right term @steve99 knows his stuff about this ![]() This isn't a new concept to engines or sports car, in fact a Shelby GT500 from 2007-2010 didn't even come with a knock sensor and doing something irresponsible like putting fuel under 91 would probably kill the car in a few highway runs. I don't understand why you're making a big deal when everyone is telling you you're wrong, including the manual and science. Find something of hard tangible evidence to prove us wrong.
__________________
*SOLD*OFT Stage 2 UEL E85/Nameless Performance 3 inch axleback with 5 inch mufflers/ TRD CAI / CNT UEL/ Cusco Strut BAR & LHD Brake Stop / "JDM" Toyota Badges / WinJet JDM headlights - DRL MOD from fteightysix.com - 5000K Diode Dynamics HID kit / Diode Dynamics LED interior Lights and sidemarker bulbs / JDM Clear Sidemarkers / Diode Dynamics LED switchbacks/ OLM LED rear turn signals / Tap Turn Relay*SOLD*
Last edited by FRSBRZGT86FAN; 03-23-2016 at 02:59 PM. |
|||||||
![]() |
![]() |
The Following 10 Users Say Thank You to FRSBRZGT86FAN For This Useful Post: | clayrush (03-23-2016), Cole (03-22-2016), finch1750 (03-23-2016), HunterGreene (03-23-2016), mdm (03-22-2016), new2subaru (03-22-2016), soulreapersteve (03-23-2016), STZ (03-23-2016), Tcoat (03-22-2016), _Kodiak (04-05-2020) |
![]() |
#19 | |
Senior Member
Join Date: Mar 2014
Drives: '11 Cayman , '14 Camry, '11 Tacoma
Location: Eastern NC
Posts: 509
Thanks: 57
Thanked 396 Times in 198 Posts
Mentioned: 5 Post(s)
Tagged: 1 Thread(s)
|
Quote:
What I'm saying is a 12.5 CR dramatically increases the potential for detonation, and no amount of tuning can change that. Yes, the ECU can adjust timing, A/F, etc, to tolerate the lower octane, but there will be definite compromises in performance, efficiency, and longevity. |
|
![]() |
![]() |
The Following 5 Users Say Thank You to billwot For This Useful Post: | Cole (03-22-2016), FRSBRZGT86FAN (03-22-2016), HunterGreene (03-23-2016), mdm (03-22-2016), Tcoat (03-22-2016) |
![]() |
#20 | |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,286 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Quote:
So yes 87 would be crappy fuel for our cars but that does not make it crappy fuel in general.
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
|
![]() |
![]() |
The Following 5 Users Say Thank You to Tcoat For This Useful Post: | Cole (03-22-2016), FRSBRZGT86FAN (03-22-2016), gramicci101 (03-22-2016), HunterGreene (03-23-2016), mdm (03-22-2016) |
![]() |
#21 | |
Senior Member
Join Date: Jun 2013
Drives: 2023 GR SUPRA,15 FR-S (SOLD)
Location: Philadelphia, PA
Posts: 4,235
Thanks: 3,086
Thanked 2,100 Times in 1,397 Posts
Mentioned: 31 Post(s)
Tagged: 2 Thread(s)
|
Quote:
My bad I say crappy relative to what this car normally is supposed to use octane wise, I'll fix it ![]()
__________________
*SOLD*OFT Stage 2 UEL E85/Nameless Performance 3 inch axleback with 5 inch mufflers/ TRD CAI / CNT UEL/ Cusco Strut BAR & LHD Brake Stop / "JDM" Toyota Badges / WinJet JDM headlights - DRL MOD from fteightysix.com - 5000K Diode Dynamics HID kit / Diode Dynamics LED interior Lights and sidemarker bulbs / JDM Clear Sidemarkers / Diode Dynamics LED switchbacks/ OLM LED rear turn signals / Tap Turn Relay*SOLD*
|
|
![]() |
![]() |
The Following User Says Thank You to FRSBRZGT86FAN For This Useful Post: | Tcoat (03-22-2016) |
![]() |
#22 |
Senior Member
Join Date: Jul 2014
Drives: 2020 Hakone
Location: London, Ont
Posts: 69,845
Thanks: 61,656
Thanked 108,286 Times in 46,456 Posts
Mentioned: 2497 Post(s)
Tagged: 50 Thread(s)
|
Figured that may be the case that was why I added that last line.
__________________
Racecar spelled backwards is Racecar, because Racecar.
|
![]() |
![]() |
![]() |
#23 |
Banned
Join Date: Dec 2013
Drives: FT86
Location: Australia
Posts: 7,998
Thanks: 1,035
Thanked 4,987 Times in 2,981 Posts
Mentioned: 598 Post(s)
Tagged: 2 Thread(s)
|
Here is a real world log taken from a stock car (stock tune) in South Africa.
They only have 95 RON fuel about same as USA 91 fuel. note the IAM is 0.2, for best performance and economy it should be 1. Their are still knock corrections of 3 degrees (FLKC) even though the eCU has reduced timing substantially by lowering the IAM to 0.2. Once the ECU reduces IAM to 0 then that,s the limit of its ability to correct for knock. No all the south African cars are not blown up on side of road, but 95 ron fuel is about the limit of what the ecu can safely cope with. note this log was on street not track. The south africian car were one of the first to get the DI seal failure due knock, on the early roms when the transient ignition retard was not enabled. This log is from a car on A01G rom which has the DI seal fix/retard changes. All the tune in all stock ecu's is same throught the world, the differnt id are just to cope with metric/imperial or other differences in car lie tire pressure monitoring ect. http://datazap.me/u/steve99/south-af...=2-27&mark=280 |
![]() |
![]() |
The Following 2 Users Say Thank You to steve99 For This Useful Post: | FRSBRZGT86FAN (03-22-2016), Tcoat (03-23-2016) |
![]() |
#24 |
Senior Member
Join Date: Sep 2014
Drives: 13 FRS Satin
Location: Alberta
Posts: 162
Thanks: 25
Thanked 60 Times in 41 Posts
Mentioned: 1 Post(s)
Tagged: 0 Thread(s)
|
The owner's manual actually says 93 octane and do not exceed 10% ethanol I believe. You can read it yourself.
EDIT: Thanks for the clarification, I knew it was low ethanol but couldn't remember how low. I don't carry my manual around. Last edited by Chanpion; 03-23-2016 at 10:38 PM. |
![]() |
![]() |
![]() |
#25 | |
Banned
Join Date: Dec 2013
Drives: FT86
Location: Australia
Posts: 7,998
Thanks: 1,035
Thanked 4,987 Times in 2,981 Posts
Mentioned: 598 Post(s)
Tagged: 2 Thread(s)
|
Quote:
ethanol content limit is likely due to the ecu limits on correcting for fuel density changes due ethanol content by using fuel trims LTFT. ethanol burns very clean and has a higher octane rating than most pump fuels. as long as your fuel has an octane rating recomended by manufacturer and ethaol content recomended by manufacturer you will be fine |
|
![]() |
![]() |
![]() |
#26 |
Senior Member
Join Date: Feb 2016
Drives: FR-S
Location: Right there.
Posts: 261
Thanks: 1
Thanked 187 Times in 107 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
I use E85. I have also had to use several tanks of 87 when that was all that was available "every now and then". The horror.
|
![]() |
![]() |
![]() |
#27 |
not a twin owner
Join Date: Jan 2016
Drives: 2016 Veloster Turbo DCT
Location: Northern Virginia, USA
Posts: 734
Thanks: 992
Thanked 463 Times in 267 Posts
Mentioned: 7 Post(s)
Tagged: 2 Thread(s)
|
|
![]() |
![]() |
The Following User Says Thank You to mdm For This Useful Post: | Chanpion (03-23-2016) |
![]() |
#28 |
Senior Member
Join Date: Feb 2016
Drives: FR-S
Location: Right there.
Posts: 261
Thanks: 1
Thanked 187 Times in 107 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
That's in that book-thing in the glove box, right? Strange how well the car runs on E85. And for 87, I just back the plugs out a few turns to lower the compression. Problem solved.
Here, I shall also respond with a picture: ![]() You do your thing, I'll do mine. You panic if you have to over having to use "crap" gas "every now and then". |
![]() |
![]() |
|
|
![]() |
|
|
![]() |
||||
Thread | Thread Starter | Forum | Replies | Last Post |
E100 vs 99.7% ethanol | diodelphi | Software Tuning | 25 | 10-31-2014 02:54 PM |
93 octane w/ethanol or 91 without | existensil | BRZ First-Gen (2012+) -- General Topics | 16 | 05-24-2014 06:32 PM |
Non ethanol gas | reesmicm | Scion FR-S / Toyota 86 GT86 General Forum | 21 | 08-21-2013 02:14 PM |
Ethanol | Andrew666 | AUSTRALIA | 30 | 08-09-2013 08:13 AM |
91 w/o Ethanol, or 93 with 10%? | Superhatch | Engine, Exhaust, Transmission | 21 | 05-20-2013 10:07 AM |