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Is 91 Octane bad for our cars?? My dad thinks that this car should only use 91 octane, I also read somewhere if I use 89 or 87 that the engine will make a nocking noise just like mine is doing right now.. I just started using 91 today.. The car feels like its got more power at low RPM's  , but the price og 91 octane is 2 bucks which sucks!!  SO IS 91 BAD FOR MY CAR OR SHOULD I USE 89??
1995 Contour SE MTX
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I have no life
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IF u'R caR is knoCkinG, then SomeTHing is PRobaBly wronG wItH it. UsIng whAt iT saYs to USe is usUALly beSt, whICh WoUld be 87 oCTanE.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Scourge of the Master Debaters
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The standard Duratec is designed for 87 octane. If you're in fact experiencing pinging and knocking, yes you should upgrade to a higher octance, and yes, it will make the car perform better. As far as what exact octane to use, use the lowest octane that eliminates the pinging. Anything higher and you're just wasting money.
Beer is my Gatorade.
Hooray Beer.
'98 "Sport" Pacific Green
'98 E0 SVT Silver Frost
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Whats wrong did ur keyboard broke too???  I wont listen to u cuz u probobly dont know what it says to use anyways 
1995 Contour SE MTX
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1995 Contour SE MTX
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In your '95 (or any "garden variety" Contique , for lack of better term) , you'll do just fine using 89 octane fuel (probably even 87) . You shouldn't see any ill-effects at all . 91 octane won't hurt anything either , except your wallet  . The SVT line , however , is said to need 91+ octane due to higher compression & whatnot . Some have used less octane in their SVTs and said they noticed no difference . I won't use anything less than 91 in my SVT , though .
~~~~~~~ Phil
Black & Tan 2000 SVT Contour #2137 of 2150
35,000 miles & counting !
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Actually Kremit did touch on something important: pinging/knocking could be caused by (among other things) lean air/fuel (vacuum leak) or increased compression, which could simply be a result of your higher-mileage engine accumulating carbon on the top of the piston. You should consider getting it looked at if the pinging persists or gets worse.
http://www.superchargersonline.com/content.asp?id=104
Beer is my Gatorade.
Hooray Beer.
'98 "Sport" Pacific Green
'98 E0 SVT Silver Frost
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Originally posted by Y2KMondeoSVT:
In your '95 (or any "garden variety" Contique , for lack of better term) , you'll do just fine using 89 octane fuel (probably even 87) . You shouldn't see any ill-effects at all . 91 octane won't hurt anything either , except your wallet . The SVT line , however , is said to need 91+ octane due to higher compression & whatnot . Some have used less octane in their SVTs and said they noticed no difference . I won't use anything less than 91 in my SVT , though .
i only use 87 in my svt. it says use 91 only on the fuel gage but in the svt owner's manual it says that the engine has a built in "knock sensor" and you may use 87. it says 91 is simply recommended. i emptied my tank and filled it with 91 when i went to the track. per the butt dyno, no difference.  its about 20-25 cents more per gallon, ie $255 a gallon out here. 
Originally posted by Tourgasm:
Sometimes you can mess up a word so bad that spell check doens't know what the hell you're talking about.
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Originally posted by Emin:
Whats wrong did ur keyboard broke too??? I wont listen to u cuz u probobly dont know what it says to use anyways
U dOn'T reMEmbeR? I BOUght yoUr keYboArD. AnD yeaH I kNo nuFFin.
98.5 SVT
91 Escort GT (almost sold)
96 ATX Zetec (i brake to watch you swerve)
FS: SVT rear sway bar
WTB: Very cheap beater
CEG Dragon Run - October 13-15
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Originally posted by hetfield:
If you're in fact experiencing pinging and knocking, yes you should upgrade to a higher octance, and yes, it will make the car perform better. As far as what exact octane to use, use the lowest octane that eliminates the pinging. Anything higher and you're just wasting money.
No it will not make the car perform better in the "true" sense of performance increase.
It will get back some of the lost power the "knocking" is taking away from the engine but it Will Not add power above what the engine had to begin with.
Adding octane Does Not add power.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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