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Re: Ran on 94 octane (from 87) now surge of momentary power at start then stutter
Volkswagen Golf, Jetta, Corrado, Vanagon, new models, etc. (rec.autos.makers.vw.watercooled)
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#1
 
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Re: Ran on 94 octane (from 87) now surge of momentary power at start then stutter -
06-30-2003
, 08:25 PM
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I know all the stuff about high octane doing nothing.... but I swear I can feel something. Perhaps my car shouldn't be run on low octane fuel anymore... who knows. Seems odd that there is different start off performance when I changed gasolines tho. "H2Only" <gsnieder (AT) canspec (DOT) com> wrote in message news:d3f7f191.0306300638.428fcb5e (AT) posting (DOT) google.com... "Rob Guenther" <robguenther (AT) sympatico (DOT) ca> wrote in message news:<N6KLa.521$eF3.99351 (AT) news20 (DOT) bellglobal.com>... Hey 1991 Golf GL 1.8L gasoline engine (100 Hp) I filled up with some 94 Octane gas (because it was cheap... only 61.9 cents per litre of 87 octane, 74.9 for 94octane.... regular gas was this much a few months ago). Anyhow, I took it for a blast down the highway for an hour and a bit.... seemed to get great gas mileage for a change. Anyhow now when I go to start up in first gear the car wants to jump the gun a little.... it will start to take off, but then will start to stutter because I am not nearly giving it enough gas for what it wants to do (this is all still while the clutch isn't even all the way out)..... Should I have just kept putting crude old 87 Ocane in it, as per usual.... I like treating the car to 94 Octane now and then to clean it out on the highway (its a city car... it gets carbonized). This phenomenon only happens when I want to start off quickly off the line, which I wanted to do twice, the other 2-3 starts since I left the offramp were just normal acceleration attempts.... nothing out of the usual. By the sound of it, 94 octane is the next best thing to a shot of nitrous . . . One of the myths about hi-test is that it is somehow 'cleaner' than regular. Hi-test is not going to magically un-carbon valves and clean injectors any better than regular can. You might notice a slight improvement in MPG (maybe 1-2), but nowhere near enough to justify 25% higher cost. And I doubt that most folks' butt-dynos are sensitive enough to detect a performance difference in most of the engines that were designed for regular. Sorry. H2Only btw, one of my cars just passed emissions with old, regular grade gas . . . I didn't do a thing to prepare it. |
#2
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Thing is, I don't know what knocking actually sounds like. But the engine seems to sound a little different under hard acceleration with premium. With regular at full throttle its like you can hear the individual cylinders fire... sounds really powerfully, with premium this quiets down and there is more acceleration once as you get higher in speed... at least IMO. BTW it could be that the 94 octane was a "super clean" type of gas... maybe less sulphur? "Peter Cressman" <cressmanp (AT) sympatico (DOT) ca> wrote in message news  q5Ma.2304$eF3.278628 (AT) news20 (DOT) bellglobal.com...I know what you mean. My Jetta flew on Premium fuel...it makes some sortof difference... - Peter "Rob Guenther" <robguenther (AT) sympatico (DOT) ca> wrote in message news:Sn0Ma.3889$Ec2.238660 (AT) news20 (DOT) bellglobal.com... I know all the stuff about high octane doing nothing.... but I swear I can feel something. Perhaps my car shouldn't be run on low octane fuel anymore... who knows. Seems odd that there is different start off performance when I changed gasolines tho. "H2Only" <gsnieder (AT) canspec (DOT) com> wrote in message news:d3f7f191.0306300638.428fcb5e (AT) posting (DOT) google.com... "Rob Guenther" <robguenther (AT) sympatico (DOT) ca> wrote in message news:<N6KLa.521$eF3.99351 (AT) news20 (DOT) bellglobal.com>... Hey 1991 Golf GL 1.8L gasoline engine (100 Hp) I filled up with some 94 Octane gas (because it was cheap... only 61.9 cents per litre of 87 octane, 74.9 for 94octane.... regular gas was this much a few months ago). Anyhow, I took it for a blast down the highway for an hour and a bit.... seemed to get great gas mileage for a change. Anyhow now when I go to start up in first gear the car wants to jump the gun a little.... it will start to take off, but then will start to stutter because I am not nearly giving it enough gas for what it wants to do (this is all still while the clutch isn't even all the way out)..... Should I have just kept putting crude old 87 Ocane in it, as per usual.... I like treating the car to 94 Octane now and then to clean it out on the highway (its a city car... it gets carbonized). This phenomenon only happens when I want to start off quickly off the line, which I wanted to do twice, the other 2-3 starts since I left the offramp were just normal acceleration attempts.... nothing out of the usual. By the sound of it, 94 octane is the next best thing to a shot of nitrous . . . One of the myths about hi-test is that it is somehow 'cleaner' than regular. Hi-test is not going to magically un-carbon valves and clean injectors any better than regular can. You might notice a slight improvement in MPG (maybe 1-2), but nowhere near enough to justify 25% higher cost. And I doubt that most folks' butt-dynos are sensitive enough to detect a performance difference in most of the engines that were designed for regular. Sorry. H2Only btw, one of my cars just passed emissions with old, regular grade gas . . . I didn't do a thing to prepare it. |
#3
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My Jetta ('90 Carat) tends to rumble ***a little*** when I floor it....me thinks that that is due to it being an automatic transmission...regardless, there is a noticeable difference on Premium fuel. I typically use Petro Canada fuel, as Esso fuel tends to have a very high water content, and the car runs poorly on Esso anyway... - Peter "Rob Guenther" <robguenther (AT) sympatico (DOT) ca> wrote in message news:7j6Ma.4244$Ec2.294304 (AT) news20 (DOT) bellglobal.com... Thing is, I don't know what knocking actually sounds like. But the engine seems to sound a little different under hard acceleration with premium. With regular at full throttle its like you can hear the individual cylinders fire... sounds really powerfully, with premium this quiets down and there is more acceleration once as you get higher in speed... at least IMO. BTW it could be that the 94 octane was a "super clean" type of gas... maybe less sulphur? "Peter Cressman" <cressmanp (AT) sympatico (DOT) ca> wrote in message news q5Ma.2304$eF3.278628 (AT) news20 (DOT) bellglobal.com...I know what you mean. My Jetta flew on Premium fuel...it makes some sortof difference... - Peter "Rob Guenther" <robguenther (AT) sympatico (DOT) ca> wrote in message news:Sn0Ma.3889$Ec2.238660 (AT) news20 (DOT) bellglobal.com... I know all the stuff about high octane doing nothing.... but I swear I can feel something. Perhaps my car shouldn't be run on low octane fuel anymore... who knows. Seems odd that there is different start off performance when I changed gasolines tho. "H2Only" <gsnieder (AT) canspec (DOT) com> wrote in message news:d3f7f191.0306300638.428fcb5e (AT) posting (DOT) google.com... "Rob Guenther" <robguenther (AT) sympatico (DOT) ca> wrote in message news:<N6KLa.521$eF3.99351 (AT) news20 (DOT) bellglobal.com>... Hey 1991 Golf GL 1.8L gasoline engine (100 Hp) I filled up with some 94 Octane gas (because it was cheap... only 61.9 cents per litre of 87 octane, 74.9 for 94octane.... regular gas was this much a few months ago). Anyhow, I took it for a blast down the highway for an hour and a bit.... seemed to get great gas mileage for a change. Anyhow now when I go to start up in first gear the car wants to jump the gun a little.... it will start to take off, but then will start to stutter because I am not nearly giving it enough gas for what it wants to do (this is all still while the clutch isn't even all the way out)..... Should I have just kept putting crude old 87 Ocane in it, as per usual.... I like treating the car to 94 Octane now and then to clean it out on the highway (its a city car... it gets carbonized). This phenomenon only happens when I want to start off quickly off the line, which I wanted to do twice, the other 2-3 starts since I left the offramp were just normal acceleration attempts.... nothing out of the usual. By the sound of it, 94 octane is the next best thing to a shot of nitrous . . . One of the myths about hi-test is that it is somehow 'cleaner' than regular. Hi-test is not going to magically un-carbon valves and clean injectors any better than regular can. You might notice a slight improvement in MPG (maybe 1-2), but nowhere near enough to justify 25% higher cost. And I doubt that most folks' butt-dynos are sensitive enough to detect a performance difference in most of the engines that were designed for regular. Sorry. H2Only btw, one of my cars just passed emissions with old, regular grade gas . . . I didn't do a thing to prepare it. |
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