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Joined: Sep 2000
Posts: 9,602
Hard-core CEG'er
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Hard-core CEG'er
Joined: Sep 2000
Posts: 9,602 |
Originally posted by svt4stv:
i only use 87 in my svt.
i emptied my tank and filled it with 91 when i went to the track. per the butt dyno, no difference.
Did you reset the PCM and let it relearn for the higher octane. EXACTLY!!!
Also the knock sensor ONLY pulls timing AFTER detonation occurs. 
'nuff said.
2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Joined: Jul 2002
Posts: 4,714
Scourge of the Master Debaters
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Scourge of the Master Debaters
Joined: Jul 2002
Posts: 4,714 |
Originally posted by DemonSVT:
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.
That's exactly what I was saying. The car will perform better if you're experiencing knocking and you upgrade to a higher octane to eliminate the knock.
Beer is my Gatorade.
Hooray Beer.
'98 "Sport" Pacific Green
'98 E0 SVT Silver Frost
Pictures
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Joined: Jul 2004
Posts: 27
New CEG\'er
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New CEG\'er
Joined: Jul 2004
Posts: 27 |
Some real bad advice being given out here.
Odds are your pinging is because of carbon deposits in the upper cylinder head area. Higher octane will mask the problem but at the same time speed the rate of carbon accumulation. Hunt online for a source for a product called "44K", it's made by a company named B&G (www.bgprod.com).A professional mechanic friend recommended one can every 3 months to remove the deposits and it's worked.
Grow up! Quit asking stupid questions! And quit acting like you know it all!!!!
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Joined: Oct 2004
Posts: 198
CEG\'er
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CEG\'er
Joined: Oct 2004
Posts: 198 |
Just to confuse the issue, here's what Ford says in the manual (page 164, 98 Mystique)
87 Octane recommended, light knocking is to be considered normal.
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Joined: Jul 2004
Posts: 862
Veteran CEG\'er
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Veteran CEG\'er
Joined: Jul 2004
Posts: 862 |
light knocking ot be considered normal? Thats a little wierd in my book.
ATX MTX swap, rear drum disc swap, drilled rotors, ported intake, optim throttle body, CAI, 7.5L MAF, adj. fuel regulator, longtube headers, underdrive pulley, no EGR, low inpedence bigger injectors, 2002 Focus Swap
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Joined: Aug 2004
Posts: 5,882
Addicted CEG\'er
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Addicted CEG\'er
Joined: Aug 2004
Posts: 5,882 |
Originally posted by DemonSVT:
Originally posted by svt4stv:
i only use 87 in my svt.
i emptied my tank and filled it with 91 when i went to the track. per the butt dyno, no difference.
Did you reset the PCM and let it relearn for the higher octane. EXACTLY!!!
Also the knock sensor ONLY pulls timing AFTER detonation occurs.
'nuff said.
im not up too much on this kinda stuff. set pcm by disconnecting battery? would it make a difference really? in speed times? just curious. im not very smarts on performance stuff.
and what you said about the knock sensor is Chinese to me. i was only quoting what the manual said. please explain what you mean by "pulls timing after detonation"  
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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Joined: May 2002
Posts: 21,653
I have no life
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I have no life
Joined: May 2002
Posts: 21,653 |
Originally posted by BradfordScales:
Some real bad advice being given out here.
Odds are your pinging is because of carbon deposits in the upper cylinder head area. Higher octane will mask the problem but at the same time speed the rate of carbon accumulation. Hunt online for a source for a product called "44K", it's made by a company named B&G (www.bgprod.com).A professional mechanic friend recommended one can every 3 months to remove the deposits and it's worked.
u cAn'T REaD.
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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Joined: Mar 2003
Posts: 7,117
Hard-core CEG'er
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Hard-core CEG'er
Joined: Mar 2003
Posts: 7,117 |
Originally posted by hetfield:
As far as what exact octane to use, use the lowest octane that eliminates the pinging. Anything higher and you're just wasting money.
Excellent
Must be that jumbly-wumbly thing happening again.
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Joined: Nov 2000
Posts: 10,015
Hard-core CEG'er
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Hard-core CEG'er
Joined: Nov 2000
Posts: 10,015 |
Originally posted by svt4stv:
Originally posted by DemonSVT:
Originally posted by svt4stv:
i only use 87 in my svt.
i emptied my tank and filled it with 91 when i went to the track. per the butt dyno, no difference.
Did you reset the PCM and let it relearn for the higher octane. EXACTLY!!!
Also the knock sensor ONLY pulls timing AFTER detonation occurs.
'nuff said.
im not up too much on this kinda stuff. set pcm by disconnecting battery? would it make a difference really? in speed times? just curious. im not very smarts on performance stuff.
and what you said about the knock sensor is Chinese to me. i was only quoting what the manual said. please explain what you mean by "pulls timing after detonation"
So you have a "CAI" and you use 87 Octane. If that isn't oxymoronic, then I don't know what is.
Deteonation is the uncontrolled, explosive, combustion of fuel/air in the combustion chamber (normally the charge should burn across the chamber like a wave, not a BANG!). It's basically destroys the combustion chamber internals by disrupting the cool boundary layer normally found around the charge, and thus superheats the head, valves, and pistons accompanied with percussive force which damages the wristpins, conrods and bottom end bearings = BAD!
Pinging/detonation sounds like rattling marbles in a can, and the knock sensor "listens" for this and pulls timing if it hears it (but it can only retard the timing so much) to try and diminish the detonation from occuring. When the ECU does this, you make less power.
Thus putting on a power adding modification (CAI) on, then using piss-water for gas in a car that has high compression (why it needs high octane fuel) is stupid.
Reminds me of the silly dopes who tried to dyno their modified SVT's with 87 octane and then were baffled why there car made even less power than a stock car! 
2000 SVT Turbo 295hp/269ftlb@12psi
#1 for Bendix Brakes Kits!
Knuckles rebuilt w/new bearings $55
AUSSIE ENDLINKS $70
Gutted pre-cats $80/set
A lack of planning on your part does not constitute an emergency on mine!
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Joined: Sep 2002
Posts: 6,106
Addicted CEG\'er
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Addicted CEG\'er
Joined: Sep 2002
Posts: 6,106 |
Originally posted by Stazi:
So you have a "CAI" and you use 87 Octane. If that isn't oxymoronic, then I don't know what is.
Deteonation is the uncontrolled, explosive, combustion of fuel/air in the combustion chamber (normally the charge should burn across the chamber like a wave, not a BANG!). It's basically destroys the combustion chamber internals by disrupting the cool boundary layer normally found around the charge, and thus superheats the head, valves, and pistons accompanied with percussive force which damages the wristpins, conrods and bottom end bearings = BAD!
Pinging/detonation sounds like rattling marbles in a can, and the knock sensor "listens" for this and pulls timing if it hears it (but it can only retard the timing so much) to try and diminish the detonation from occuring. When the ECU does this, you make less power.
Thus putting on a power adding modification (CAI) on, then using piss-water for gas in a car that has high compression (why it needs high octane fuel) is stupid.
Reminds me of the silly dopes who tried to dyno their modified SVT's with 87 octane and then were baffled why there car made even less power than a stock car!
Soooo.... What you're saying is.... 
Mark
2000 Black CSVT
3.0L Hybrid - 206fwhp & 195fwtq
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