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#1
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SVX Gas
Is it necessary to run the SVX with 92 Octane Fuel? With prices going up and up (1 gallon of 87 is 2.26), can I run it with 89? I just don't know why I would have to run 92 through it.
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-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#2
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if you don't run at least 91 you risk pre-ignition in the combustion chamber, which can destroy the engine.
even if the pre-ignition doesn't reach that level, the on-board computer will retard timing in an attempt to avoid knocking - which will reduce gas mileage enough that I suspect you will actually use enough more gas to pay the difference. as an alternative the ECU tuning mod will allow the running of "regular" through use of an alternate fuel mapping (I suspect it runs quite rich). |
#3
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Running 92 instead of 87 is only a couple dollars more per tank. I don't think it is that big of a deal to spend two or three dollars more a tank. I paid 2.69 a gallon yesterday to fill up.
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Current: 2005 Black Legacy 2.5i 63k Previous: 1996 Brilliant Red SVX LSi 117k |
#4
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I've done it and have only noticed a slight difference in power response. My experience is that the ECU adapts very well to whatever I put in it. I calculated the difference in cost between the premium grade and the cheap stuff and found that it only costs me about $100 per year. I figure the extra horsepower is worth the money. If I didn't want power, I wouldn't be driving an SVX.
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#5
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Quote:
The SVX has a high compression engine. High compression can easily lead to engine knock if too low of an octane is used. When the computer senses knocking it will retard timing to help lessen the knocking. Retarded timing causes lower engine performance and lower gas mileage. Using a lower octane on the SVX to save a two or three bucks at fill up is false economy and if done on a repeated basis, potentially dangerous. Consider the extra expense of premium to be insurance against engine performance problems Dave |
#6
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Yep. This ain't no 91 Legacy L Dave |
#7
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Quote:
-Chike
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#8
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Chike - here I go, getting ready to embarass myself by doing math in public, but....
using 20mpg on regular, 22mpg on premium (your figures), you would use 5 and roughly 4.55 gallons to go 100 miles. At $0.20 difference per gallon (what it is around me anyway) and using $2.25 and $2.45 (what I saw yesterday), the costs to travel the 100 miles would be: $11.25 regular $11.14 premium so, over the course of the average driver's year (12K miles), the difference would be $13.64 cheaper to use premium - not to mention what savings would come about through less stress on engine internals. |
#9
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Lee - I like your math whether is is true or not! That is why it is interesting to do the math on the cost. You may not be saving anything and be doing harm to the engine.
__________________
. 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 |
#10
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I guess that means when I come into getting an SVX, I'll be having to put premo gas in it.
__________________
-Jason (8/23/07-Present) 1995 Subaru SVX LSi (197k) Polo Green (#1102) 03/95 Mods: DDM Tuning 4500k 35w Low Beam HID, 100w H3 Bulbs, Extra Ground Cables, 15 minute $12.96 mod, svxfiles designed transmission mount (), sporting a "new" tail light bar, silver BBS rims, custom power steering cooler (one that doesn't dump ATF constantly), new negative lead cable, no more third or fourth gear (1977-Present) 1977 Chevrolet Corvette (81k) Silver (12/01/2011-Present) 2005 Subaru Outback 2.5i Limited 5MT (97k) I have a bad feeling about this. -Obi Wan Kenobi |
#11
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or just buy huge quanities of oct tain booster and do some math and figure out how much to use to bring u to around the 90s.
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#12
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#13
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Quote:
-Chike
__________________
"Wise men talk because they have something to say; fools, because they have to say something." - Plato 2013 Cosmic Blue 5spd Evo X GSR 2006 Galaxy Gray 6MT RX-8 (sold) 2006 Steel Gray WRX TR (sold) 1996 Brilliant Red SVX L (sold) |
#14
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Quote:
I would.
__________________
. 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 |
#15
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(Do not run leaded fuel in an SVX.) Besides, the higher octane won't make a bit of difference, performance-wise. Aircraft and racing engines require higher octane to prevent knock; it's not like running nitro or something. So it's not amazing. dcb |
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