Notices
991 2012-2019
Sponsored by:
Sponsored by:

15% Ethanol and 991s?

Thread Tools
 
Search this Thread
 
Old 10-11-2018, 12:31 PM
  #16  
ncm
Intermediate
 
ncm's Avatar
 
Join Date: Nov 2017
Posts: 35
Received 0 Likes on 0 Posts
Default Cash for Clunkers Mega Edition

Ethanol is a nightmare for the carbs on my old Honda bike - gunk everywhere and water in the bowls after only 3-4 weeks sitting. I sold my dream Ducati because ethanol expands their plastic fuel tanks, which I think will eventually wreck resale values even on bikes without symptoms. 15% may not be a big problem for newish cars that run through a tank weekly. But for those of us who put less than 10k miles per year on the car, I hope the supply of ethanol free gas becomes a lot more widespread.
Old 10-11-2018, 12:43 PM
  #17  
stout
Rennlist Member
 
stout's Avatar
 
Join Date: Feb 2007
Location: ^ The Bay Bridge
Posts: 4,872
Received 1,266 Likes on 590 Posts
Default

Originally Posted by ncm
Ethanol is a nightmare for the carbs on my old Honda bike - gunk everywhere and water in the bowls after only 3-4 weeks sitting. I sold my dream Ducati because ethanol expands their plastic fuel tanks, which I think will eventually wreck resale values even on bikes without symptoms. 15% may not be a big problem for newish cars that run through a tank weekly. But for those of us who put less than 10k miles per year on the car, I hope the supply of ethanol free gas becomes a lot more widespread.
^ Yep. Just spent $800 addressing fuel leaks in my 914...which had hoses that that were only a few years old. There were eight leaks, and the final failure mode (noticeable) was raw gasoline literally pouring out of the car in my driveway. I wonder if anyone has figured the cost (in dollars and environmental damage) of replacing hoses and other components and sending the bad stuff to landfill, allowing gasoline to escape to the earth and air through said leaks, and strapping otherwise running cars or motorcycles to diesel flatbeds to send them to a shop for repairs? All this, alongside the (much bigger) issues of how ethanol is made.

Ethanol is a mess. But it "sounds good."

My best solution may be going to Sears Point for gas for that car whenever possible, but that gets tricky if I want to keep the tank full because the car sits a lot. The extra 30-minute trip ain't good for the environment, either. Perhaps it's time to convert more of these corn farms to something else....
Old 10-11-2018, 12:57 PM
  #18  
Bob Z.
Rennlist Member
 
Bob Z.'s Avatar
 
Join Date: Jul 2001
Location: Marineland FL
Posts: 12,409
Likes: 0
Received 3,365 Likes on 2,308 Posts
Default

You can search for ethanol free gas online but most is 89 octane: https://www.pure-gas.org/index.jsp
Old 10-11-2018, 02:03 PM
  #19  
aCayenneFan
Pro
 
aCayenneFan's Avatar
 
Join Date: Jul 2013
Location: S.F. Bay Area
Posts: 539
Received 56 Likes on 38 Posts
Default

Originally Posted by 4 Point 0
Forget about being GREEN for a moment. (I have no idea whether it helps or hurts the environment.) Just focus on the Stoichiometric values. Normal Gas is 14.7:1 E85 is 9.6:1

Which means to hit Lambda1 You need a lot more of E85 poured down the neck. However, if you are tuned for it. you get a bucket load of power. : )
None of the current crop of P-cars is tuned for E15. E15 is a plan to fail.
Old 10-11-2018, 02:08 PM
  #20  
stout
Rennlist Member
 
stout's Avatar
 
Join Date: Feb 2007
Location: ^ The Bay Bridge
Posts: 4,872
Received 1,266 Likes on 590 Posts
Default

Originally Posted by aCayenneFan
None of the current crop of P-cars is tuned for E15. E15 is a plan to fail.
Which is kind of the point of potential for a serious lawsuit filed by ownership groups, insurers (warranty companies), and/or automakers. There are some basic assumptions made when engineering a car for a given market, and one of those is that there will be fuel for the vehicles you are making and selling to people that the car can actually run correctly on.

Arbitrarily changing the nation's fuel supply in a manner that has real costs for its consumers—and automakers who have to cover warranty repairs—is a recipe for disaster.
Old 10-11-2018, 09:22 PM
  #21  
trevorlj
Advanced
 
trevorlj's Avatar
 
Join Date: Mar 2018
Location: Fort Worth, TX
Posts: 83
Received 35 Likes on 15 Posts
Default

Hate to throw some science and experience in here with the hatred but based on Brake Specific Fuel Consumption E10 requires scheduling around 5.2-7.5% more fuel to make the same power and E15 requires around 7.8-10.3% additional fuel over straight gas. Most of the OEM computers I've dealt with over the years have between 12 to 20% authority (+/- from baseline - as in 24-40% total authority) to trim fuel delivery in closed loop operation and (easily) the fuel system overhead to match a 120% request. I would be quite surprised if a 2.6-2.8% additional requirement would be the straw that broke the camels back in a modern system with wideband O2's designed for E10.

But yeah...DOWN WITH ETHANOL!!!
Old 10-11-2018, 09:31 PM
  #22  
Scottish Pete
Racer
 
Scottish Pete's Avatar
 
Join Date: Jul 2014
Location: Visalia, California
Posts: 312
Likes: 0
Received 9 Likes on 7 Posts
Default

I have replaced rubber fuel lines in my 1960 Austin-Healey 3000, 1962 VW Convertible and twice on my 1974 911 due to fuel leaking through the rubber fuel lines. They ran fine for the 40-55 years I have owned the cars . . . until ethanol showed up in California a decade or so back.
Old 10-11-2018, 09:37 PM
  #23  
4 Point 0
Rennlist Member
 
4 Point 0's Avatar
 
Join Date: Aug 2017
Posts: 2,345
Received 1,189 Likes on 628 Posts
Default

Originally Posted by trevorlj
Hate to throw some science and experience in here with the hatred but based on Brake Specific Fuel Consumption E10 requires scheduling around 5.2-7.5% more fuel to make the same power and E15 requires around 7.8-10.3% additional fuel over straight gas. Most of the OEM computers I've dealt with over the years have between 12 to 20% authority (+/- from baseline - as in 24-40% total authority) to trim fuel delivery in closed loop operation and (easily) the fuel system overhead to match a 120% request. I would be quite surprised if a 2.6-2.8% additional requirement would be the straw that broke the camels back in a modern system with wideband O2's designed for E10.

But yeah...DOWN WITH ETHANOL!!!
LOL, I was going to say that. All you really need to do is increase the fuel trims to get a huge benefit. Once COBB release Pro-Tuning, it will be a piece of cake. But then of course you are able to do a full E85 tune : )
I can see its no good for people who don't want to tune. But for people who do, its very large smiles.
Old 10-11-2018, 09:47 PM
  #24  
STG
Race Director
 
STG's Avatar
 
Join Date: Nov 2014
Location: FL
Posts: 13,800
Likes: 0
Received 193 Likes on 137 Posts
Default

Ban ethanol, eat more popcorn



Old 10-11-2018, 10:03 PM
  #25  
Noah Fect
Rennlist Member
 
Noah Fect's Avatar
 
Join Date: Aug 2012
Location: Pac NW
Posts: 6,243
Received 1,298 Likes on 886 Posts
Default


Originally Posted by stout
Where is AAA when it is needed?
Lobbying for lower speed limits. Maybe think about that when it's time to renew.

Seems to me there might be an effective lawsuit to block such legislation, as the gov't is proposing something that not only isn't good for the environment (ethanol has been shown to be less than it promises to be, and destructive even at 5-10%) but requires something that violates the mechanical needs of some rather expensive consumer products: cars. As in, all cars, which tend to be a significant asset to most Americans in both % terms as well as utility whether we're talking about a 991 or a Civic.
Who ya gonna sue? Donald Trump? Get in line...

Originally Posted by trevorlj
Hate to throw some science and experience in here with the hatred but based on Brake Specific Fuel Consumption E10 requires scheduling around 5.2-7.5% more fuel to make the same power and E15 requires around 7.8-10.3% additional fuel over straight gas. Most of the OEM computers I've dealt with over the years have between 12 to 20% authority (+/- from baseline - as in 24-40% total authority) to trim fuel delivery in closed loop operation and (easily) the fuel system overhead to match a 120% request. I would be quite surprised if a 2.6-2.8% additional requirement would be the straw that broke the camels back in a modern system with wideband O2's designed for E10.

But yeah...DOWN WITH ETHANOL!!!
Why are you arguing with us? We didn't write the owner's manual.
Old 10-12-2018, 01:22 AM
  #26  
aCayenneFan
Pro
 
aCayenneFan's Avatar
 
Join Date: Jul 2013
Location: S.F. Bay Area
Posts: 539
Received 56 Likes on 38 Posts
Default

Originally Posted by Bob Z.
You can search for ethanol free gas online but most is 89 octane: https://www.pure-gas.org/index.jsp
Or, buy Sunoco Race Gas: https://www.sunocoracefuels.com/fuel/ss-100 Since it is a specialized formulation, and the proposed regulation does not mandate E15 for all gas, Sunoco Race Gas should remain an option. As long as you can find it....

However, given the common interest of the environmental and gasoline refining lobbies in this matter, I personally wouldn't bet on E15 being a nation-wide mandate.
Old 10-12-2018, 01:26 AM
  #27  
Churchill
Three Wheelin'
 
Churchill's Avatar
 
Join Date: Jan 2016
Posts: 1,519
Received 253 Likes on 163 Posts
Default

Originally Posted by stout
Ah, just checked. We did pass legislation to get rid of it. And now the oil industry and environmental groups are joining forces to fight the plan to require 15% ethanol in our gasoline. Talk about strange bedfellows....
110% because Iowa holds the first presidential primary (well, caucus) in the country. You win Iowa, you have momentum into New Hampshire, other states, then the nomination, then the presidency. Candidates say they'll do away with ethanol, and then they spend the two years before running for president visiting every corn farm and county fair in Iowa.
Old 10-12-2018, 01:36 AM
  #28  
spdracerut
Three Wheelin'
 
spdracerut's Avatar
 
Join Date: Feb 2016
Posts: 1,708
Received 542 Likes on 369 Posts
Default

Originally Posted by trevorlj
Hate to throw some science and experience in here with the hatred but based on Brake Specific Fuel Consumption E10 requires scheduling around 5.2-7.5% more fuel to make the same power and E15 requires around 7.8-10.3% additional fuel over straight gas. Most of the OEM computers I've dealt with over the years have between 12 to 20% authority (+/- from baseline - as in 24-40% total authority) to trim fuel delivery in closed loop operation and (easily) the fuel system overhead to match a 120% request. I would be quite surprised if a 2.6-2.8% additional requirement would be the straw that broke the camels back in a modern system with wideband O2's designed for E10.

But yeah...DOWN WITH ETHANOL!!!
The issue isn't the ability of the fuel system to adjust the fuel trims. The issue is the materials used for all the components in the fuel system. Ethanol degrades materials used in fuel systems designed for plain unleaded gas. 10% is about the limit typical materials used can handle without significant degradation. But 15% is too much for sure for older cars. A car designed to run flex fuel and E85 will not have issues, but every other car will.
Old 10-12-2018, 11:08 AM
  #29  
stout
Rennlist Member
 
stout's Avatar
 
Join Date: Feb 2007
Location: ^ The Bay Bridge
Posts: 4,872
Received 1,266 Likes on 590 Posts
Default

Originally Posted by Noah Fect
Lobbying for lower speed limits. Maybe think about that when it's time to renew.
Eh, was kind of kidding with that remark, as we don't have an ADAC (which seems far cooler than AAA).

While I've gone on and off of AAA for roadside (it's kinda hard to beat), I've never given AAA a dime for car insurance after my high-school experience with an AAAer who rear-ended me. "Good news," said the agent with bright green eyes and brighter red hair. "We're going to total your car for you!" Amount offered? $3k. Even back then, the car was worth more than that (albeit not that much). It's still on the road today, and man am I thankful to Dick Cottrell, who schooled me on dealing with insurance companies in general and AAA in particular.
Old 10-12-2018, 12:46 PM
  #30  
Got_Corners?
Advanced
 
Got_Corners?'s Avatar
 
Join Date: Oct 2015
Location: Harford
Posts: 95
Received 52 Likes on 24 Posts
Default

Originally Posted by Bob Z.
You can search for ethanol free gas online but most is 89 octane: https://www.pure-gas.org/index.jsp
this is very helpful, thanks! Quick follow up question though....is 94 octane harmful to our motors (991.1 C2S) also if not specifically tuned/timed for it? I ask cause there is a station near me with it and I'll happily switch to avoid 10% or 15% Ethanol.


Quick Reply: 15% Ethanol and 991s?



All times are GMT -3. The time now is 04:25 AM.