01-09-2014, 04:11 PM
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#1
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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octane effects power and engine temp?
Hey guys/gals. I topped off my fuel tank last night, about half empty, with 87 octane with no ethanol. this morning I noticed less power. This evening I noticed even less power and the engine was not as snappy to rev and it was running warmer than usual. Oil looks clean, no condensates, coolant level is topped off and clean. I topped off the tank on my way home tonight, 91 octane, the highest I can get here, the engine ran at normal temp and the engine felt a little stronger but not as strong as I'm used to. Did I just get some bad gas? I was able to squeeze 3.4 gallons of 91 octane while topping off tonight.
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01-09-2014, 05:12 PM
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#2
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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Quote:
Originally Posted by jdlmodelt
Hey guys/gals. I topped off my fuel tank last night, about half empty, with 87 octane with no ethanol. this morning I noticed less power. This evening I noticed even less power and the engine was not as snappy to rev and it was running warmer than usual. Oil looks clean, no condensates, coolant level is topped off and clean. I topped off the tank on my way home tonight, 91 octane, the highest I can get here, the engine ran at normal temp and the engine felt a little stronger but not as strong as I'm used to. Did I just get some bad gas? I was able to squeeze 3.4 gallons of 91 octane while topping off tonight.
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Ethanol is lower total BTU content than gas by about 1/3, so any fuel containing a level of ethanol is going to be down on power and mileage.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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01-09-2014, 05:15 PM
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#3
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Quote:
Originally Posted by JFP in PA
Ethanol is lower total BTU content than gas by about 1/3, so any fuel containing a level of ethanol is going to be down on power and mileage.
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will the engine run noticebly hotter too?
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01-10-2014, 04:48 AM
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#4
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Registered User
Join Date: Feb 2005
Location: It's a kind of magic.....
Posts: 6,614
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Quote:
Originally Posted by jdlmodelt
will the engine run noticebly hotter too?
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It could, but that could also be related to the overall quality of the gas as well.
__________________
“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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01-09-2014, 05:19 PM
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#5
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Registered User
Join Date: Dec 2006
Location: shoreham, ny
Posts: 1,619
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Why would you put 87 in???
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996 3.4 engine with 2.7 986 5speed transmission
Ebay Headers, Fabspeed high flow cats, JIC Cross, IPD Plenum, H&R Coilovers, B&M Short Shifter, AEM Uego Gauge Type Analog, Apexi S-AFC Select, 987 air box, Litronics, 2000 Tails and side markers, painted center console, 18" 987 S-Wheels, GT3 Front bumper with splitter.
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01-09-2014, 05:22 PM
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#6
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Quote:
Originally Posted by JAAY
Why would you put 87 in???
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Its all the station had that I stopped at. They were the last station in the region that wasn't putting 10% ethanol in the gas. But, I think I would be better with 91 and 10% ethanol?
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01-09-2014, 05:28 PM
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#7
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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Quote:
Originally Posted by jdlmodelt
Its all the station had that I stopped at. They were the last station in the region that wasn't putting 10% ethanol in the gas. But, I think I would be better with 91 and 10% ethanol?
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I didn't notice, it must have happened recently, my wife said there is a new sticker that indicates 10% ethanol plus the inferior 87 octane. double whammy
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01-09-2014, 06:21 PM
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#8
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Registered User
Join Date: Nov 2013
Location: Colorado
Posts: 442
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my idle is rock solid
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01-09-2014, 07:37 PM
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#9
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Registered User
Join Date: Sep 2013
Location: Chandler, AZ
Posts: 1,796
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87 octane??? In a Porsche?? Ferdinand Porsche is rolling over in his grave.
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03 Carrera
02 Boxster S Guards Red, black interior with matching hardtop
89 Carrera 4
89 944 S2
78 911SC
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01-10-2014, 07:16 AM
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#10
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Registered User
Join Date: Oct 2008
Location: O.C. CA
Posts: 3,709
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Quote:
Originally Posted by jdlmodelt
Its all the station had that I stopped at. They were the last station in the region that wasn't putting 10% ethanol in the gas. But, I think I would be better with 91 and 10% ethanol?
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This must be a high elevation location. High altitude reduces octane requirement since the lower oxygen content richens the air/fuel ratio.
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OE engine rebuilt,3.6 litre LN Engineering billet sleeves,triple row IMSB,LN rods. Deep sump oil pan with DT40 oil.
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