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Hooner
Monza


Joined: 03 May 2018
Posts: 155
Location: Co Antrim,NI


PostPosted: Thu Jan 17, 2019 6:37 pm    Post subject: Fuel additives ? Reply with quote

Does any use fuel additives to their tank for extra lubrication? now and then just wondering if it would help combat bore score. Question
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16660
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Jan 17, 2019 6:40 pm    Post subject: Reply with quote

How would fuel additives lubricate what goes on under the piston rings where the damage occurs?
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angry
Montreal


Joined: 30 Sep 2008
Posts: 602
Location: East sussex


PostPosted: Thu Jan 17, 2019 6:42 pm    Post subject: Reply with quote

IMHO Wouldn't bother.

Save your pennies for the rebuild if you plan on keeping the car long term and you think its going to suffer from it... Thumb
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Hooner
Monza


Joined: 03 May 2018
Posts: 155
Location: Co Antrim,NI


PostPosted: Thu Jan 17, 2019 6:53 pm    Post subject: Reply with quote

Well i was just reading about how todays fuel is a bit crap and full of ethanol just wondered if it might help. Not to worried about it really just a bit of banter.
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eabeukes
Monza


Joined: 30 Jan 2018
Posts: 176
Location: Aylesbury

1999 Porsche 996 Carrera 2

PostPosted: Thu Jan 17, 2019 7:08 pm    Post subject: Reply with quote

I've found locally the Tesco 99 stuff is pretty good in both my 996 and the wifes 4x4 lumps. The Esso of the same grade makes both our cars blow fumes as it seems to suffer from quite a bit of water mixed in. My father-in-law does 25k+ miles per year and swears by the cheap diesel from Morrisons , but won't use anything other than 'proper' BP or Shell - he wont even stop at any other garages when travelling for his work.

Might be worth seeing what your local fuels are like at other garages? Consider the price of those additives and then put them into a savings jar. At a bottle a month your costs equal using 99+ RON fuel anyway which *should* give you almost all the same benefits. Oh and do oil changes every 6 months and post off a sample with your savings instead - much better for peave of mind!
 
  
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7132
Location: Brighton


PostPosted: Fri Jan 18, 2019 10:48 pm    Post subject: Reply with quote

These cars can adjust to different fuel octaine rateings .. an additive is not required .

Its called knock control .

For me .. im happy with how Porsche designed these cars , i think they do a very good job at addapting and i feel a third party solution to a non existent problem is not the best way forward Thumb

IMHO .

Its still an excellent question though as im sure others have thought the same thing ... but perhaps never asked Smile
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NedHan79
Nürburgring


Joined: 08 Nov 2018
Posts: 491



PostPosted: Fri Jan 18, 2019 11:53 pm    Post subject: Reply with quote

Demort, have you ever used any of the carbon cleaning services? You know the type of thing that plugs into your fuel line and runs for an hour or whatever to clean the injectors. I’ve never used them but would consider it.
I had larger injectors in my last car (Impreza) and pulled them out again as we couldn’t seem to get enough juice, so I sent them off for cleaning. Turns out they were very close to where they should have been (540cc odd from 565 when new) with very little variation between them.
I don’t fancy pulling out the 996 injectors as I’m obviously not tuning it but a clean couldn’t be a bad idea.
Surely hartech and the likes would be flowing injectors on a full rebuild?
 
  
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Hooner
Monza


Joined: 03 May 2018
Posts: 155
Location: Co Antrim,NI


PostPosted: Sat Jan 19, 2019 2:56 pm    Post subject: Reply with quote

deMort wrote:
These cars can adjust to different fuel octaine rateings .. an additive is not required .

Its called knock control .

For me .. im happy with how Porsche designed these cars , i think they do a very good job at addapting and i feel a third party solution to a non existent problem is not the best way forward Thumb

IMHO .

Its still an excellent question though as im sure others have thought the same thing ... but perhaps never asked Smile

well i learnt something new i didn't know they could self adjust Thumb
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 16660
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sat Jan 19, 2019 3:13 pm    Post subject: Reply with quote

You didn't know cars designed to run on super unleaded adjust the ignition timing when normal unleaded was put in, to avoid engine damage?
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deMort
Dijon


Joined: 21 Mar 2015
Posts: 7132
Location: Brighton


PostPosted: Sat Jan 19, 2019 5:20 pm    Post subject: Reply with quote

Fuel additives and the like are something i have used many times in the past but before i worked on Porsche.

Basically 15 years ago .. the cars then would have been at least 10 years old and normally older.

Engine flushes when doing an oil change .. a good idea to a point but i used some on an old Ford Granada i had .. yup it cleaned out all the crap .. but then it rattled its head off after that .

Never .. Ever use an engine flush on a Porsche .

Fuel additives did make a difference but more so on Diesels .

These days fuel is much better .. oil is much better so additives are imho not needed .. also the cars i used to work on were not quite as expensive or as well designed as these ones are .

Knock sensors on your car will detect incorrect combustion due to the fuel rateing and alter the timing accordingly.

Newer cars have more sensors .. 991 and there is a value for the fuel in the car when useing a tester ... i guess it works it out over time .


Carbon cleaning .. we have looked into it but have yet to find a system we think is any good .

996 and i dont really see the point .. 997 gen 2 or any dfi engine and they are going to be needed at some point ... again .. imho.
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