|
Software Tuning Discuss all software tuning topics. |
|
Thread Tools | Search this Thread |
08-10-2021, 11:14 AM | #1 |
Senior Member
Join Date: Aug 2020
Drives: 2022 MT Neptune GR86 Prem.
Location: Cincinnati, OHIO
Posts: 492
Thanks: 143
Thanked 315 Times in 199 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
e85 "rotation" necessary ...
So I've been running e85 pretty much exclusively on OFT standard e85 2+ tune for a little over 5 months (big thanks to the Alternative Fueling Station locator app) with zero issues. Early on I would check the trims after new tanks but stopped doing it since they were always fine and always pretty much the same.
So, my question is is there any reason to rotate to a few tanks of 93 before switching back? And if you say yes, please provide me with a sound, well-reasoned logical reason why - what does it help? What does it do? BTW - my same response would go to the guy down below who said "don't fuck around and go with flex fuel system" which I disagree with entirely. Don't get me wrong, I have no issues with guys running flex fuel and it is a handy set-up particularly if you live somewhere with little e85 availability (not generally the case here in the midwest). I also happen to think you are as likely, if not more likely, to have an issue running flex fuel and constantly changing back and forth than someone like me who doesn't and only and consistently runs e85 (most of it from the same station). |
08-10-2021, 11:20 AM | #2 |
Senior Member
Join Date: Nov 2011
Drives: Some rust bucket
Location: Polar ice cap
Posts: 3,058
Thanks: 312
Thanked 1,045 Times in 556 Posts
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
|
doesn't hurt to run some e10 to 'clean' out the lines periodically since the car isn't rated for full e85.
you don't want e85 to be in your tank for an extended period of time. it's generally accepted e85 doesn't store well compared to e10. |
The Following User Says Thank You to ayau For This Useful Post: | Dzmitry (08-10-2021) |
08-10-2021, 12:16 PM | #3 | |
Senior Member
Join Date: Jul 2019
Drives: 2018 Subaru BRZ Limited with PP
Location: Phildalphia, Pennsylvania
Posts: 975
Thanks: 2,123
Thanked 609 Times in 391 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
Quote:
The only thing you really need to care about when running E85 is proper care of the vehicle. I assume you are aware that E85 wants to absorb moisture - which can lead to corrosion and such for fuel system components. So take better care of these components (check them / change them more often than typical service intervals may require). Clean your injectors every 30-40K miles maybe. Replace the fuel pump at a shorter interval than recommended - and maybe with an aftermarket that is meant to handle E85. Inspect fuel lines and regulator at times. The easiest care I can think of to have less worry about all these components is just doing the right things to avoid any water buildup in your fuel system. Don't leave the car sitting around for long periods of time being the big one. Keep your fuel topped off as much as possible is another big one - don't drive the car to empty all the time, and in general avoid it. The benefit of having flex-fuel in my opinion is just simplifying the worry about some of those things. Because gasoline doesn't absorb moisture, so you reduce that risk (that's pretty much the #1 reason in my opinion that flex-fuel has the upper hand). It also adds benefits in dealing with cold starts. Aside from all that, there isn't much more that I can think of off the top of my head. Flex or straight has proved to work completely fine. Ethanol, in general, just requires a little more care and maintenance to help avoid any future issues. |
|
08-10-2021, 12:45 PM | #4 |
Senior Member
Join Date: Nov 2011
Drives: Some rust bucket
Location: Polar ice cap
Posts: 3,058
Thanks: 312
Thanked 1,045 Times in 556 Posts
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
|
The WRX high pressure fuel pump will seize up if running too much e85 under certain scenarios. Running e10 usually resolves this issue.
The components aren’t rated for straight e85 and any suggestions is really just based on anecdotal evidence, so use your best judgement. |
The Following User Says Thank You to ayau For This Useful Post: | Dzmitry (08-10-2021) |
08-10-2021, 02:18 PM | #5 |
Senior Member
Join Date: Jun 2021
Drives: GEN-1-86-MT-FI / 2022 KTM RC 390
Location: Vancouver Washington
Posts: 156
Thanks: 27
Thanked 62 Times in 46 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
|
08-10-2021, 04:21 PM | #6 | |
Senior Member
Join Date: Aug 2020
Drives: 2022 MT Neptune GR86 Prem.
Location: Cincinnati, OHIO
Posts: 492
Thanks: 143
Thanked 315 Times in 199 Posts
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Don't misunderstand what I am saying about flex fuel - I think it is fine assuming everything is working properly. But I think using it and frequently changing what you are running (thus constantly changing your tuning) is more likely to run into an issue with having the wrong tuning than running the same fuel all the time. Of course, it does have the benefit (which probably outweighs my issue) of being able to change tuning depending on the ethanol percentage of the e85 you are running (given it technically can run 51% - 83%). Understand what you are saying about water and leaving it sit for long periods with e85. Good news is it gets driven frequently and the longest it has ever sat is one week. The drives are generally exactly the kind you would like - commute for 25 minutes on mostly highway miles. As for the fuel pump, other than getting stuck somewhere in an inconvenient location (which I am not too worried about), don't see why I would ever change it before it fails (if it ever does). It's not a "maintenance part" and other than above, its failure is not otherwise dangerous to other parts of the car. Also not sure about the advice of cleaning injectors. Seems to me like e85 users should be on a longer, not shorter, interval for cleaning injectors than e10 users would be, right? Am I missing something? How do yo clean injectors? |
|
08-10-2021, 05:18 PM | #7 | |
Senior Member
Join Date: Nov 2011
Drives: Some rust bucket
Location: Polar ice cap
Posts: 3,058
Thanks: 312
Thanked 1,045 Times in 556 Posts
Mentioned: 37 Post(s)
Tagged: 0 Thread(s)
|
Quote:
some wrx owners who are tuned on e85 will have issues with their high pressure fuel pump. tuners suggest staying below e60. the theory is that e85 has less lubrication than e10, therefore, it seizes up. emptying the e85 with e10 usually fixes the issue. is it just the fuel or are there external variables causing the fuel pump failure? who knows. keep in mind there are diminishing returns once you're above a certain ethanol level. for example, the wrx gains the most at e30. after that, there are diminishing returns. so there's no point in running straight e85 other than not having to mix, which the flex fuel solves that issue for you. |
|
08-11-2021, 10:48 AM | #8 | |||||
Senior Member
Join Date: Jul 2019
Drives: 2018 Subaru BRZ Limited with PP
Location: Phildalphia, Pennsylvania
Posts: 975
Thanks: 2,123
Thanked 609 Times in 391 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
Quote:
Quote:
Quote:
Quote:
Quote:
Theoretically, you're right about all the maintenance thoughts, you shouldn't have to do as much maintenance with some of the items, aside from the fuel pump possibly due to it working harder. E85 does clean the system better and prevent gunk from building up. But as @ayau stated, there is not enough evidence out there for us to make clear conclusions. How long can your car sit before moisture gets into the fuel system? What kind of temperatures and humidity could cause this to happen much quicker, and how fast? There can be so many different factors. Which is why if you at least follow the general care guidelines that we've discussed, you are already doing the best you can to prevent any problems. As a side note, I only know of one shop (I'm sure there are plenty others out there) that does injector cleaning. https://www.counterspacegarage.com/f...-86-subaru-brz |
|||||
The Following User Says Thank You to Dzmitry For This Useful Post: | CincyJohn (08-11-2021) |
08-11-2021, 11:31 AM | #9 | |
Senior Member
Join Date: Jul 2019
Drives: 2018 Subaru BRZ Limited with PP
Location: Phildalphia, Pennsylvania
Posts: 975
Thanks: 2,123
Thanked 609 Times in 391 Posts
Mentioned: 4 Post(s)
Tagged: 0 Thread(s)
|
Quote:
|
|
08-11-2021, 11:56 AM | #10 |
Senior Member
Join Date: Jan 2018
Drives: Crapcan
Location: Oregon
Posts: 11,145
Thanks: 18,142
Thanked 16,305 Times in 7,369 Posts
Mentioned: 107 Post(s)
Tagged: 0 Thread(s)
|
One of the bigger issues with e85 is that it is more corrosive to rubber parts. There are lubricating additives that you can add to your tank if you are concerned with that. There is enough long term data on running e85 on here I am not too worried about it. I wouldn't store the car for longer periods of time with e85 as it is also more hygroscopic then fuels with lower ethanol content.
__________________
"Experience is the hardest kind of teacher. It gives you the test first and the lesson afterward." -Oscar Wilde.
|
The Following User Says Thank You to NoHaveMSG For This Useful Post: | Dzmitry (08-11-2021) |
08-11-2021, 02:28 PM | #11 |
Senior Member
Join Date: Jun 2021
Drives: GEN-1-86-MT-FI / 2022 KTM RC 390
Location: Vancouver Washington
Posts: 156
Thanks: 27
Thanked 62 Times in 46 Posts
Mentioned: 2 Post(s)
Tagged: 0 Thread(s)
|
|
08-11-2021, 09:31 PM | #12 | |
Senior Member
Join Date: Jan 2018
Drives: 2013 frs red
Location: South Florida
Posts: 3,517
Thanks: 2,520
Thanked 3,088 Times in 1,654 Posts
Mentioned: 6 Post(s)
Tagged: 1 Thread(s)
|
Quote:
|
|
08-12-2021, 07:04 AM | #13 |
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)
|
Ive run E85 for almost 8 years, no additives, stock fuel system , 80,000 km no issues, not run any petrol in thst time.
Last edited by steve99; 08-12-2021 at 05:28 PM. |
The Following 6 Users Say Thank You to steve99 For This Useful Post: | bcj (08-12-2021), Capt Spaulding (08-12-2021), DAEMANO (08-14-2021), Dzmitry (08-13-2021), Lantanafrs2 (08-12-2021), x808drifter (08-12-2021) |
08-12-2021, 06:36 PM | #14 | |
Join Date: Jul 2012
Drives: S2000 CR
Location: Orange County
Posts: 14,528
Thanks: 8,917
Thanked 14,175 Times in 6,834 Posts
Mentioned: 966 Post(s)
Tagged: 14 Thread(s)
|
Quote:
To everyone else who says they have no issues: Have you ever flowbenched your injectors after just being on ethanol for a long time? Independent data my surprise you and change your mind very, very quickly. |
|
|
|
Thread Tools | Search this Thread |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
FS: TRD "D oval" exhaust, OEM engine mounts, "STi" Radiator Cap cover | Dave-ROR | Engine, Exhaust, Bolt-Ons | 1 | 05-18-2020 03:34 PM |
FS: Avant Garde M310 Matte Black 18" x 9" and 18" x 8" w/ Michelin Pilot Super Sports | NvSnickers | Wheels and Tires | 2 | 04-04-2017 10:30 PM |
"Clicking" or "knocking" caused by rear seat pull down lever. | husker741 | Issues | Warranty | Recalls / TSB | 6 | 11-27-2013 02:30 PM |
"My Dealer told me {insert dumb idea}" (was "Toyota/Subary Partnership Cancelled?") | levifig | BRZ First-Gen (2012+) -- General Topics | 48 | 08-09-2013 06:34 PM |
Which Markets have "GT86" and "Toyota" badges on trunk? | Tanuki | Scion FR-S / Toyota 86 GT86 General Forum | 20 | 02-10-2013 05:23 PM |