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#1
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Stage 1v4, 87 octane code and rotten eggs
This is a comment/question for LAN, but I posted it in the public forum to see if anyone else out there has experienced this.
I am running ECUTune Stage 1v4 on a '95 L-AWD with 91 octane fuel. On a whim I switched the ECUTune code set over to the 87 octane position and drove the car to dinner to see if I could feel any performance difference. (Side note: Honestly I could not feel a difference, but the ambient temperature was down 20 deg. from earlier in the day.) After an awesome feast of sushi and Asahi beer (not driving now ) I returned to the car to discover the most horrid of rotten egg smells had formed in/around my car! I immediately switched back to 91 octane code and the nastiness went away within a few miles of open window driving. I am assuming that the smell was my catalytic converters telling me they were not happy. LAN, any ideas why this occured? Is this problem going to occur with 87 octane if I need to run it as well?
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'95 Subaru SVX L-AWD 88K miles. Last edited by PhatWeasel; 02-26-2006 at 09:58 AM. |
#2
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Are your 91 and 87 octane fuels blended the same? I wouldn't think anything that the 1v4 chip does would cause the egg smell, though I do agree it's your cats that are the cause of it....
-Bill
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Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#3
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Quote:
In my understanding there should be little/no difference in performance and function when running 91 octane in an engine tuned for 87 octane. Of course all my personal research was done using old Ford and Toyota engines of ~8:1 compression ration where the phrase "Minimum Octane Rating" means just that. SVX engines are new territory for me, but I don't see why an engine tuned for 87 octane would have a problem with 91.
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'95 Subaru SVX L-AWD 88K miles. |
#4
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So you had the 91 octane in the tank at the time, but switched it to the 87 setting? Why would you do that? I wouldn't think that would be good unless you put 87 fuel in the tank.
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. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19 |
#5
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Like I said, the experiment was from the old school of thought. Back when there was a minimum octane rating and anything higher didn't really make a difference. If the machine was designed for 87 octane, you could run 89, 91 or higher and never know the difference, except in the wallet. Perhaps my experiment wasn't thought out all the way through seeing that the EG33 is a far cry from Ford's 400M V8.
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'95 Subaru SVX L-AWD 88K miles. |
#6
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I see your thinking now. Good point.
__________________
. Earl .... ... .... ><SVX(*> Subaru Ambassador [COLOR=”silver”]1992 Tri Color L[/COLOR] ~45K (06/91) #2430 1992 Dark Teal LS-L ~184K (05/91) #0739 1992 Claret LS-L ~196K (05/91) #0831 1992 Pearl LS-L ~103K (06/91) #1680 1992 Pearl LS-L ~151K (06/91) #2229 1992 Dark Teal LS ~150K (07/91) #3098 (parts car) 1992 White LS-L ~139K (08/92) #6913 1993 25th AE ~98K (02/93) #164 1993 25th AE ~58K (02/93) #176 1993 25th AE ~107K (02/93) #215 1993 25th AE ~162K (02/93) #223 1994 Laguna Blue Pearl LSi ~124K (1/94) #2408 1994 Laguna Blue Pearl LSi ~144K (10/93) #1484 1994 Laguna Blue Pearl LSi ~68K (10/93) #1525 1994 Barcelona Red LSi ~46K (02/94) #2624 1994 Pearl LSi ~41K (12/93) #1961 1995 Bordeaux Pearl LSi ~70K (02/95) #855 1996 Polo Green LSi ~95K (03/96) #872 1997 Bordeaux Pearl LSi ~55K (08/96) #097 2003 Brilliant Red LS1 Convertible ~29K (04/03) #8951 1999 Magnetic Red LS1 Coupe ~33K (04/99) #6420 My Email | Old Locker | New Locker | Picture of 15 of the 19 |
#7
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pretty sure it shouldnt matter in any engine if you run higher than normal octane. All the octane rating is, the gas' ability to resist knock, *I believe, Im sure someone will chime in if im wrong* Therefore I dont see why it would of made a difference...However it did so something was going on...
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#8
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Could some of the other members please 'flip the switch' and see if you get similar results?
Dan PS: I own one but haven't installed it yet. |
#9
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I remember reading the owners manual for my old work truck, which was a 2000 Ford F-250. It specifically said that the truck was designed to run on 85 (or 87? I cant remember) octane, and that using anything else was dangerous and would cause knock.
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#10
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Quote:
-Bill
__________________
Retired NASA Rocket Scientist Most famous NASA "Child" - OSIRIS-REx delivered samples from asteroid BENNU to Earth in Sept. 2023 Center Network Member #989 '92 Fully caged, 5 speed, waiting for its fully built EG33 '92 "Test Mule", 4:44 Auto, JDM 4:44 Rear Diff with Mech LSD, Tuned headers, Full one-off suspension '92(?) Laguna, 6 spd and other stuff (still at OT's place) My Locker |
#11
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Quote:
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'95 Subaru SVX L-AWD 88K miles. |
#12
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I still dont understand why running it on the 87 code would cause this as octane is only the gas' ability to resist detonation or knock. Come on LAN where ya at ???
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#13
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I developed the 87 octane code back when my car had a cat and it never smelled like rotten eggs. I think you just ran over or parked over something. No one else has ever complained of my software making their car smell either.
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#14
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Maybe he's just trying to say his car now "goes like stink" with the Stage I chip
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David B. SVXipedia @ SVX-IW.COM -- SVX Information Warehouse 2.0 coming...eventually! Ebony 1992 SVX LS-L 5 spd Koni/GC Stebro 187k miles RIP (Rust In Pieces) 1993 SVX 5 spd Koni/GC Stebro Polyurethane bushings still available! |
#15
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'95 Subaru SVX L-AWD 88K miles. |
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