Porsche Enthusiasts Club Forum

It is currently Thu Mar 28, 2024 10:49 pm
Classic Line Insurance


All times are UTC [ DST ]




Post new topic Reply to topic  [ 12 posts ] 
Author Message
 Post subject: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Thu Oct 26, 2017 6:13 pm 
Offline

Joined: Sun May 17, 2015 10:07 pm
Posts: 34
Location: Leeds
TIPEC membership: 0
As the title says really. I know there has been discussion on this in the past, but the answers are confusing - of the "Porsche says it needs to be 98, so how can you say you know better" to "I've always used normal fuel and it's fine" variety!

I'm confused!


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Thu Oct 26, 2017 6:28 pm 
Offline
Moderator
Moderator
User avatar

Joined: Sun Nov 04, 2007 8:43 pm
Posts: 12645
Location: Chatham, Kent
TIPEC membership: 4190
In around 7 years & 46K miles mine was run on standard Unleaded albeit either Shell or BP. The few times I tried super unleaded it made zero difference. Mine was a 87 2.5 the same as yours.

_________________
Jim

http://tipec.net/region_southeastlondon.php

2018 Mitsubishi Outlander PHEV
2005 Porsche Cayenne S Now sold!
2000 Jeep Grand Cherokee Now sold!
2010 Mazda MX5 Mk3.5 2.0 Sport Tech
2000 Porsche Boxster S SOLD!
1987 Porsche 944 2.5


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Thu Oct 26, 2017 6:36 pm 
Offline
Site Admin
Site Admin

Joined: Thu Jan 01, 1970 1:00 am
Posts: 5523
Location: Rochester, Kent
TIPEC membership: 911
Always good to have the debate, lots of crap talked about when it comes to fuel. I sell millions of litres.

Fuel is not all the same, despite what some would have you believe. The higher octane fuels burn better and the branded fuels have much improved cleaning properties.

Supermarket fuel is often the lowest common denominator, depending on which terminal is supplying it.

MPG is also dependent on where the fuel comes from and although the differences are quite small. Hot fuel can shrink by as much as 3%.

_________________
Kent & South East London R.O

Join the Club

Silver 1989 911 Speedster
Midnight Blue 2004 996 C4S Cab
Tahoe Blue 1990 964 C2
Zenith Blue 1998 BoxsterSold
Guards Red 1992 944 S2 Cab gone but not forgotten
Mediterranean Blue BMW 530e


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Fri Oct 27, 2017 9:55 am 
Offline

Joined: Tue Dec 20, 2016 4:34 pm
Posts: 113
TIPEC membership: 0
I agree Sean, and always go for the best having tested regular supermarket against Shell V Power, Tesco Momentum and BP Super etc on Racing engines
for many years, all the super 98 & 99 and even 97 provided more power and torque & a better burn than any standard 95.

I also hear the basic 95 has less tolerances and more moisture (water) content is allowed in it, to the point where if its too low water gets added!
The higher octane fuels have different BS numbers and have to be more accurate to their RON figure.

Many car magazines have done dyno tests and found more power with the higher octane fuel, however this is not massive and not always noticeable
in some cars that are either a small capacity or an inefficient design (Not twin cams)

I've always got better MPG with the higher octane fuels even in a daily 2.0 16v Focus.

As Sean also mentioned the additives in the more expensive fuel also are a benefit.

R

_________________
www.924srr27l.co.uk


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Fri Oct 27, 2017 1:40 pm 
Offline
Site Admin
Site Admin
User avatar

Joined: Sun Nov 04, 2007 2:48 pm
Posts: 1116
Location: Wimborne, Dorset
TIPEC membership: 4746
It's worth repeating this link from the PCGB 944 forum:

https://www.porsche.com/uk/aboutporsche ... 23-classic

Porsche wrote:
These Porsche vehicles may not be run on E10 fuel. As an alternative, Super unleaded (98 RON) can be used. With a maximum bioethanol content of 5% (E5 fuel), Super unleaded is compatible with these vehicles.

_________________
Jim Tarrant

ARO Southern
Website & Forum Admin
1991 944 S2 black/grey
1986 944 Lux red/black


JOIN THE CLUB


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Fri Oct 27, 2017 4:44 pm 
Offline
Moderator
Moderator
User avatar

Joined: Sun Nov 04, 2007 8:43 pm
Posts: 12645
Location: Chatham, Kent
TIPEC membership: 4190
Whilst the 944 is quite high compression it doesn't have knock management and feedback so cannot adjust the ignition advance to suit petrol quality and engine conditions. Therefore it may not benefit from super high octane fuels.

_________________
Jim

http://tipec.net/region_southeastlondon.php

2018 Mitsubishi Outlander PHEV
2005 Porsche Cayenne S Now sold!
2000 Jeep Grand Cherokee Now sold!
2010 Mazda MX5 Mk3.5 2.0 Sport Tech
2000 Porsche Boxster S SOLD!
1987 Porsche 944 2.5


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Fri Oct 27, 2017 5:01 pm 
Offline
Site Admin
Site Admin
User avatar

Joined: Sun Nov 04, 2007 2:48 pm
Posts: 1116
Location: Wimborne, Dorset
TIPEC membership: 4746
The point is super unleaded is only 5% ethanol, and Porsche state 10% ethanol (which 95RON unleaded increasingly is) is not suitable for pre 1996 cars.

_________________
Jim Tarrant

ARO Southern
Website & Forum Admin
1991 944 S2 black/grey
1986 944 Lux red/black


JOIN THE CLUB


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Fri Oct 27, 2017 5:22 pm 
Offline

Joined: Mon Aug 23, 2010 7:58 am
Posts: 703
Location: Yateley, Hampshire.
TIPEC membership: 6489
Both excellent points, Jim and Jim. :)

My 944 S2 now runs on super-unleaded as it is fitted with a Promax ECU upgrade chip which does benefit from the use of super-unleaded and to avoid the E10 trap. Prior to that being fitted, the car ran for several years very contentedly on 95 RON Premium.

_________________
Glenn
944 S2 ("Trigger")
944 2.7 road-legal track-day car ("Doris") [Sold]


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Fri Oct 27, 2017 5:34 pm 
Offline
User avatar

Joined: Sat Aug 31, 2013 3:04 pm
Posts: 44
hotblack944 wrote:
The point is super unleaded is only 5% ethanol, and Porsche state 10% ethanol (which 95RON unleaded increasingly is) is not suitable for pre 1996 cars.

Even my '73 Beetle gets V-Power these days, for this reason.

Michael


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Tue Nov 07, 2017 3:12 pm 
Offline

Joined: Sun May 17, 2015 10:07 pm
Posts: 34
Location: Leeds
TIPEC membership: 0
Just back from hols and caught up on this - thanks for all your advice.
Howard


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Wed Nov 08, 2017 2:34 pm 
Offline

Joined: Thu Dec 05, 2013 8:29 pm
Posts: 148
Location: Whitehaven
TIPEC membership: 0
My daily 24 always gets the good stuff.

_________________
1984 924 2.0 n/a crystal Green - The daily
2005 VW Passat tdi 130 Highline, now 170bhp & 290ft/lb
2000 Peugeot 406 2.0 hdi - stood for 4 years, fresh mot and mostly working.


Top
 Profile  
Reply with quote  
 Post subject: Re: Super unleaded or normal for my 1987, 2.5 944?
PostPosted: Wed Nov 08, 2017 5:45 pm 
Offline

Joined: Sun Feb 24, 2008 8:16 pm
Posts: 1866
Location: UK
TIPEC membership: 0
All 3 cars I've got with a turbo get super, bike gets it too.


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 12 posts ] 

All times are UTC [ DST ]


Who is online

Users browsing this forum: Bing [Bot], Google [Bot] and 37 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  
Powered by phpBB © 2000, 2002, 2005, 2007 phpBB Group