Alan MaC

A while ago I posted on here that, I saw a Porsche drver putting in ordinary Unleaded in his motor.

A few Porsche owners replied saying that it was OK & they did not need Super as it could handle ordinary fuel.

Surely, the Porsche is a high performance motor?

Question, why do Scoobs need super as, both are high performance machines??

Regards.

Alan MaC

deanwoodward

the uk ones dont i think its mainly imports because they were mapped to higher fuel

Thedevilandhiscar

the import ones do not need it either as when they come in the country they need to be changed to uk spec.But I run it all the time it burns cleaner and better for the car in the long run. If you have mods done you have to run it.

Tuts

Even uk ones are recommended for super after a remap or ppp. They will take standard though at a push in standard tune.

I think it is because they are turbo'd and have the ignition advanced to the limit so a much greater risk of det. I dare say if you tuned a porsche to the limit on super you wouldnt want to put 95ron in it!

Monkeydile

Hi I'm new to the forum. Sorry to interupt the thread just want to join in.

From what i've read the higher the octane the better it burns. BP have just launched a 102 RON fuel called BP Ultimate 102 which is fairly close to racing fuel. They claim that if you have a modded car you can get anythin up to 15 BHP extra just from using it. Not sure how much truth is in it but obviously the better the quality of the fuel the more performance you'll get.

To be honest if I had a Porsche worth 80+ grand , nevermind my Scoob I wouldn't put any 95RON in it!

Thedevilandhiscar

Exactly the higher the ron the better for the car have have used that 102 in mine and it did make a difference but costs way to much to run all the time I run v power with a additive

Monkeydile

I'm running V Power at the mo. Have thought about booster though. Might get some in.
BTW how much is a litre of 102? We can't get it oop north yet

Thedevilandhiscar

I paid £2.55 a litre By the way welcome newbe

Monkeydile

Cheers mate glad to be here Thanks for the info, may be a while till I use that fuel I reckon., Think I may stick to getting V Power octane booster

Trout

iTrader: (1)

What a complete load of codswallop.

Import cars do not need to be changes to UK Spec at all. That is why there is an SVA.

Many of the new generation of cars are remapped using Ecutek and some importers such as Hendry do not regard this as necessary.

In either case SUL will be the recommended fuel for an import with PULP being marginal and certainly performance reducing.

As for using 102, it is VERY unlikely you will get any benefit unless you have mapped for it, and a UK will not get any benefit at all.

911

To max performance to fuel you need to map for it.
Vmax and NF Race booster I think is the best mix for daily driving.
Mapping for a fuel you cannot readily find is nerve wracking, and the performance gains is not worth the worry while making a long journey.

Shell stations can be hard to find in some places, so get a map off their site before a journey in the UK to places you are not used to.
Not sure about Europe?

That '102' is a rip-off imho.

My old 911 runs on anything with ease (Bosche ecu injection, 1985 3.2 engine)

Finally, welcome to Monkeydile!

Graham.

Thedevilandhiscar

The start of this does not make sense at all also if you are on about a newage then fine but a classic you can not map most of the pre97 and as far as the 102 it does run better with it and mine is a race engine you can notice the difference try it some time put a half a tank in

DIPSY

Thedevilandhiscar its 99onwards than can be ecutek and cars before 99 change of ecu likes of apexi etc

SirFozzalot

On my MY03 STi TypeUK says in the manual and on the filler cap "Use 98RON Gasolene"

So I do, or 99 now as it is available.

It does state in the manual that 95RON can be used, it just says that performance can be affected so they recommend 98RON.

Fuzz

Just because a car has been remapped for high octane doesn't mean you cannot put say 95 in if you are in the middle of nowhere with an empty tank.
It just means you have to drive NORMALLY!
Can't be that hard to drive off of full throttle can it!
If you own a mapped on v-power car but are going to the seaside on holiday or something them by all means I can't see the problem in putting a cheap fuel in.
Just don't give it the big billy ho !!
You'll probably get a clout round the ear from the missus anyway.
Not to mention the car handling like a boat with her bringing everything including the kitchen sink along !!


Andy

AudiLover

An audi will run fine on 90 ron! The engines are that durable and advanced, that they could run off toxic waste if so required!

greenonedave

i thought audis were toxic waste

pslewis

An Audi will run fine on cow pats - why? Because their performance is measured alongside the MilkFloat figures

A lot of crap is spouted on here about these 'performance' cars - but, I must say, I do use V Power or Sainsburys Super ..... I do notice the difference .... however, my UK Car will run perfectly fine on Normal UnLeaded.

matchmaker

What Audi will run on 90 ron? My Octavia vRS, which has the same 180 bhp 1.8T as various Audi models, has a sticker under the fuel filler cap which states it should be run on 98 ron. It'll do quite happily on 95 ron, but will produce less power.

I run it on Tesco 99 ron SUL

Skittles

You have to make allowances. He owns a Vulva S40 and a Transit van and has never stepped foot in an Audi. Its best to ignore his posts.

Bob Rawle

The Porsche range will happily run on V Power without booster, least my remapped GT2 will even though I mapped it with Octane booster. No change ... normal unleaded is pushing things.

cheers

Bob

Brit_in_Japan

Higher octane means greater resistance to knock, or detonation. Detonation is where the fuel explodes rather than burns in a more controlled manner. Higher octane does not mean more powerful (no extra energy in the fuel), nor does it mean it burns cleaner. It just allows the ignition to be advanced closer to the theoretical optimum.

All modern petrol engined cars will have knock sensors to detect the onset of knock and retard the ignition as required. Retarding the ignition means that you ignite the fuel later after TDC (top dead centre) during the compression phase and therefore the amount of energy you can liberate from that charge of fuel/air is less. Some engines are better than others about advancing the ignition again if you user higher octane fuel, which means that for many cars there is simply no benefit in using it. My understanding is for classic Impreza's they are slow at advancing the timing again. Therefore it will take many tanks of fuel to see the benefit of using higher octane fuel, unless that it you perform the famous ECU reset!

I would expect the ECU's on modern high performance engines to be able to compensate more quickly for higher octane fuels. The question each person has to ask is whether it is worth spending x pence extra per litre for the extra performance you will get? Modern Porsche's & Subaru's will happily run on 95 octane without any problem or risk, but at some performance penalty. The WRX I brought back from Japan was used to 100RON and as a weekend car I'm happy to pay the extra for V-Power. It would cost me '00s to regain the lost performance if I ran it on 95 RON.

Fuzz

Fuel is ignited BTDC Brit... but closer to TDC if being retarded..(maybe after if it's really about to die, but unusual)

Alan MaC

Thanks for all your input.

AS I said, I saw this chap filling up his Porsche (Carrrea GT) with 95 RON.

The Porsche owners who posted in response said, it was fine to put in 95 Ron & 97 or over reallydidn't matter.

With Petrol going up & up ( I use Super by the way 99.9p a litre @ the Moment) to me, it's important.

It is also important to me, that I don't put in "Donkey Dirt" hence the question.

KInd regards

Alan MaC

marmski

I havent read this thread right through... but a friend at work has a 911 and i was shocked when he told me he was using 95, here is the answer (with some research from both of us.. him not wanting to wreck his pride and joy!!)

Porsche owners manual (MY00 911 Carerra 4) states that fuel from 95RON upwards may be used. The engine management system in a modern 911 has the ability to manage (based on knock sensor) to advance/retard the ignition accordingly. The owners manual also shows a graph of how the power differs between higher octane and lower octane fuels (think it was like 30BHP or something when i looked at it).

A Porsche (well the 2000 shape 911 C4 anyways) will not suffer any damage from running on standard 95RON.

Type UK Imprezas on the other hand are a little confusing, the manual and the filler cap both specify 98RON in standard guise... the dealers advise 95RON as being fine... and Prodrive (with their PPP) map on 97RON.

Not sure how far an Impreza can retard, but from what i have heard the standard knock sensor is useless above 6000RPM... so i personally wouldnt feel comfortable running mine 95RON and will always stick to Esso 97RON/Tesco 99RON/V-Power 99RON to be on the safer side. (trust the manual/Prodrive over the dealer )

JDM is a whole other subject... and probably the only one qualified to advise on whether these (without remaps) are safe on even something like V-Power is the legend otherwise known as Bob Rawle.

Monkeydile

From reading the rest of this thread I'd say I don't have a huge amount of knowledge but opinion seems to be divided. I reckon to be on the safe said I'll keep using 99RON. It's running well so the way I see it is why change?

Scoob99

iTrader: (1)

My wife works where Porsche meet customers to take them to Millbrook test track, so they can really open them up, and I was surprised when she told me and I have seen for myself that they fill up at Tesco's with normal unleaded.
Cheers
Colin

GazTheHat

Yep, i've just mapped in VPower & (3ml/L) NF Race Formula.

Car went real well and liked the combo. Made +20bhp & +20lb/ft on average.

Not bad for £5 per fill extra.

Alan MaC

Nice one Colin.

Interesting as I have already said, high performance motor running on 95 with no obvoius loss of performance.

Alan MaC

chippy17

have a standard MY99, never really put anything but 95 in