Okay, so I now have over 5000 miles on my car and to me it seems like the engine has grown louder, is it just my wishful thinking? Have you guys noticed any difference?
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2005 Mustang V6, Satin Silver ext, Dark Charcoal int w/ leather GO SPURS GO!!!
I have 3,800 on mine and have not noticed a difference on the engine sound. Maybe my new exhaust covers up the change or it is a GT related thing. I thought using high octane gas without a new tune was bad for the engine. No issues on your chrisc65?
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Joined: 1/17/2005 From: New Jersey Status: offline
87 octane is fine with me...i only really drive it hard on weekends...weekdays it spends 90% of its time in the parking garage at work..which is good for me cause it protects the paint and keeps it clean during winter months
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2005 Ford Mustang V6 Premium Metallic Sonic Blue Fully Loaded 4.0 Liter V6 5-Speed Manual Trans Ordered: 1/10/2005 Recieved: 2/26/2005
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Joined: 3/11/2005 From: Los Angeles, CA Status: offline
Same here except that in California, "winter" doesn't mean the same thing to us (no salt on the roads.) I use the 87.
I don't think I've noticed a louder engine, but it's difficult for me to compare the sound I'm hearing today with the sound I was hearing 3 months ago.
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Joined: 3/19/2005 From: Boston, MA Status: offline
Where'd you get that idea? You won't see any boost in power unless the PCM is tuned to take advantage of the extra octane.
quote:
ORIGINAL: NCMustangMan
I have 3,800 on mine and have not noticed a difference on the engine sound. Maybe my new exhaust covers up the change or it is a GT related thing. I thought using high octane gas without a new tune was bad for the engine. No issues on your chrisc65?
The ECM adjusts the timing based on historical signals it receives from the knock sensor and sets a baseline advance curve, mantaining a conservative buffer between that baseline curve and the point at which knocking occurs. Of course, using higher octane reduces the tendency to detonate, thus allowing a more agressive advance curve (hence more power). The ECM will discover this reduced knock tendancy over time and will shift the curve to take advantage of that, but while still maintaining that conservative buffer. What the higher octane tune does is 1) minimize that safety buffer and 2) preset the advance to that more agressive curve.
"If you are experiencing starting, rough idle or hesitation driveability problems, try a different brand of gasoline. 'Premium' unleaded gasoline is not recommended for vehicles designed to use 'Regular' unleaded gasoline because it may cause these problems to become more pronounced." (emphasis added)
I read this as "if you want to try premium you may experience these problems, so we don't recommend it"
I do also see that after market products "may cause damage to the fuel system", fuel containing methanol "can damage critical fuel system components" and that leaded fuels "could damage your engine", however I see nothing about octane-related engine damage. EDIT: That is, unless you count the section that recommends avoiding gasolines with octane counts lower than 87 in high altitude areas.
< Message edited by MustangBuddha -- 6/15/2005 3:22:40 PM >
"If you are experiencing starting, rough idle or hesitation driveability problems, try a different brand of gasoline. 'Premium' unleaded gasoline is not recommended for vehicles designed to use 'Regular' unleaded gasoline because it may cause these problems to become more pronounced." (emphasis added)
I read this as "if you want to try premium you may experience these problems, so we don't recommend it"
I do also see that after market products "may cause damage to the fuel system", fuel containing methanol "can damage critical fuel system components" and that leaded fuels "could damage your engine", however I see nothing about octane-related engine damage. EDIT: That is, unless you count the section that recommends avoiding gasolines with octane counts lower than 87 in high altitude areas.
true - it does not say it will damage the engine (my appologies), however the problems as listed can't be good. I have read this though concerning other engines - such as my Jeep V6.
< Message edited by spec24 -- 6/15/2005 3:31:21 PM >
ORIGINAL: spec24 ... the problems as listed can't be good. ...
Good point - that hesitation would drive me nuts! Thanks for getting me to think a little harder about it. Hopefully these things are fairly anomolous...
I am also of the opinion that higher octane will help performance. I have the xcal tuner which is programmed for 3 different octanes. Along these same lines, what about octane boosters? The highest gas I can get is 91 and my third tune is for 93. Are boosters ok or should I just stick with 91? Jim
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V6 5-speed Sonic Blue. GT fog lights, Magnaflow dual exhaust, Steeda CAI, X-cal tuner, sequential tail lights, black shorty antenna, flaming horse hood decal.
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Engine louder? - 
