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Author Subject: V-power... hesitation?
stan_306gti6 Forum Admin

Location: Kent

Registered: 18 Jan 2004

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Post #26
The reason that the vehicle handbook suggests running on 97 is because the '6' engine in standard form is 10.8:1 compression which is fairly high. However, due to the fact that a lot of people will just run normal 95 regardless of the suggestion the engine has been set up with a knock sensor to compensate for the possible different fuel choice of the owner. With this, the ECU can detect when detonation is about to occur and retard the ignition timing...

Personally, I use V-Power specifically due to the advanced cleaning agents in the fuel (so they claim) being present. Wink

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Posted 9th Mar 2012 at 11:40
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owain

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Post #27
adam b wrote:
Knock is when the fuel ignites before the spark has been introduced. Caused by having too low octane rating or high intake air temps.


Incorrect

They're often confused, but knock and pre-ignition are *not* the same thing. Knock is an incorrect or uneven burn (but initiated by the spark plug) whereas pre-ignition is caused by wrong fuel or over-compression; i.e. when the fuel is ignited by pressure rather than a spark.

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Posted 9th Mar 2012 at 11:45
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adam b

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Post #28
owain wrote:
adam b wrote:
Knock is when the fuel ignites before the spark has been introduced. Caused by having too low octane rating or high intake air temps.


Incorrect

They're often confused, but knock and pre-ignition are *not* the same thing. Knock is an incorrect or uneven burn (but initiated by the spark plug) whereas pre-ignition is caused by wrong fuel or over-compression; i.e. when the fuel is ignited by pressure rather than a spark.


Fair enough. You'd better go and change a load of pages i've just read on the internet then LOL Thumbs up

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Posted 9th Mar 2012 at 11:47
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stan_306gti6 Forum Admin

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Post #29
'Knocking' is where the fuel/air combination begins to combust in the correct manner initiated by the firing of the spark plug, but some of the mixture explodes outside the area of the main flame front.

'Pre-ignition' is where the fuel/air combination is ignited in the combustion chamber without the help of a spark plug. This can be caused by extreme pressures (mixed with low octane fuels), hot spots in the chamber or incorrect temperature of spark plug selected.

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Posted 9th Mar 2012 at 12:24
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jimmyhackers

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Post #30
ive been invited to stick my oar in

the higher octane is created by adding percentages of other chemicals mainly bio-alcahols like ethanol and methanol. essentially its a gimik of sorts

these also act as detergents to a degree as they are solvents. however its possible they could melt or corrode other parts of the fuel system creating "stuff" to make deposits further along the system.

my friends mev rocket exploded a fuel line that had been softened because he was using morrisons stuff with a percentage bio-fuel added.

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Posted 9th Mar 2012 at 16:13
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woody.

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Post #31
Cheers for the info lads Thumbs up
Posted 10th Mar 2012 at 23:36
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mattgti6phase2

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Post #32
stan_306gti6 wrote:
Personally, I use V-Power specifically due to the advanced cleaning agents in the fuel (so they claim) being present. Wink


V power is no cleaner than 95 sir.

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Posted 11th Mar 2012 at 01:32
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stan_306gti6 Forum Admin

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Post #33
mattgti6phase2 wrote:
stan_306gti6 wrote:
Personally, I use V-Power specifically due to the advanced cleaning agents in the fuel (so they claim) being present. Wink


V power is no cleaner than 95 sir.


Reference to origin of information Matt? Unsure

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Posted 11th Mar 2012 at 15:28
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mattgti6phase2

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Post #34
Perhaps the way 97 fuels are marketed lead people to believe all these out ragious statements Dunno

In actual fact the main difference between the 2 are the anti knock properties being better in 97 fuels over 95. I have used both fuels and even tescos w*nky 99 fuel and the difference is nothing on my internally standard engine.

Although I do find my engine is happier to run on 95. Again my engine internally is standard.

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Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
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Posted 12th Mar 2012 at 02:17
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stan_306gti6 Forum Admin

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Post #35
mattgti6phase2 wrote:
Perhaps the way 97 fuels are marketed lead people to believe all these out ragious statements Dunno


There have been tests done where people have bench ran engines with a twin-tank setup. One tank of standard 95 is feeding two cylinders and V-Power is feeding the other two.

It ran like this for weeks, and then they stripped it down. The V-Power cylinders were A LOT cleaner than the ones that had been run on standard fuel. Yes

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Posted 12th Mar 2012 at 07:12
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mattgti6phase2

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Post #36
This debate is pointless LOL

Its simple, no power gains are to be had unless your SC TB or turbo'd and your Ecu has been set to run that fuel. Deffo no cleaner between the two though.unless i saw evidence of it, fuel experts say the cleaning differences are nil.

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Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
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Posted 12th Mar 2012 at 11:00
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swiftyboi006

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Post #37
But stan just said it was tested? (stan you must be talking bulls**t) Laugh my ass off

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Posted 12th Mar 2012 at 19:26
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stan_306gti6 Forum Admin

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Post #38
swiftyboi006 wrote:
(stan you must be talking bulls**t) Laugh my ass off


Obviously mate, after all what do I know about these things...Whistle

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Posted 12th Mar 2012 at 23:58
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mattgti6phase2

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Post #39
Roll eyes

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Team Nile 6 Superman
Team: 40.2 MPG Smile
5 x a 306 owner!
currently abusing type r's in a town near you ™ Wink
I truely live for the 306 ®
Build date: 29th October 1997 Wednesday's car
midweek madness Tee hee
Posted 13th Mar 2012 at 01:05
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gnrlee Forum Admin

Location: Leeds

Registered: 20 Aug 2005

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Post #40
Could it not just be the Lambda Sensor on its way out? Dunno

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Posted 13th Mar 2012 at 02:54
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