I think i know the answer.

My saff was mapped using Shell Vpower but could i use say bp or tesco higher octane fuels?

 

Bp is a no no if the car has been mapped to the max on shell. Tesco 99 is very close to shell so it would be ok.

Mark

 

Was it a live map Glenn?

If so then yes if its a generic greens chip then in theroy it should have a safety margin in it as long as your boost is set to the chips specs.

You must be aware of det tho thats the killer.....

 

Completely wrong. Unless you know comp ratio and how close it is to dett that's the wrong advice to give. It's easy to blow a engine even with a generic chip.

Mark

 

Yeh it was live mapped on the road.

 

I don't think it was live mapped Glenn, i think will got a chip from Motorsport Developments and just set the car up. I don't think he had the gear to Emulate Weber.

 

I'd only use the fuel it was mapped on on failing that something better with an even higher octane if you needed too

Cheers Paul

 

I would suspect this is the case, MSD are probably one of the only ones who can emulate Weber. He would know by the price he paid as well, as mapping would be a lot more expensive, compared to a calibration (i.e. EPROM).

Martin

 

When i got the car back it still have the air/fuel tester on the car, it had the lambda sensor up the exhaust pipe.

Does higher octane fuel go off after a few weeks too. Im sure ive read this in fast ford mag??

 

Which is very true but how many normal folk even know what det is and or AFR......

So every generic Bayjoo chip (rip) that has been sold by burtons states only a octane rating and recomended boost pressure to set too they dont ask comp ratios etc.

So your comment is correct but very negative imo and should i have said to Glenn take it to MAD so he can fit a bit of 13mm copper tube to the intake and listen for det thru tubes and earmuffs with each supermarket fuel?

Glenn was asking a simple question.

 

Glenn it would of had a wideband on it to check afr mate and yes super goes off quicker than normal fuel.

But i will be told i am wrong again no doubt...

 

Yeh that's what it was matey a wideband checker.

Yeh im defo sure i read higher octane fuel goes off in 2 weeks.

 

Blimey mine must be gone off fuel every time I drive it once or twice a month lol

 

Yeh the same as mine and i must admit when i do drive it after been stood for a while i give it a bit kicking. Not good if the fuels off.

 

Same here lol

 

i can, just never had the time to use it

 

Where have you read that Glenn? At work I fuel aircraft and the fuel is rated to 6 months, different fuel but even after 6 months a recirculation of the fuel will liven it up again, same on Avgas 100 octane petrol although contains some lead.
Pump fuel contains around 12% ethanol nowadays as far as I'm aware too which means you'll be down 12% on your injectors

 

Im sure i read it in fast ford mag when they did a feature about fuel.

 

Modern pump fuel is shit and dose go off. If I leave my husky supermoto for a few months the fuel in the carb turns to jelly lol

 

Additive is used in unleaded and super unleaded which should keep it stable for approximately 6 months.
Temperature plays a big part, if stored in hot conditions you will loose some light ends out of the fuel i.e. Butane as it is low flash material etc.
Its difficult to say where you can fill up from as it depends which bulk plant supplies your area.
Just because it's a Tesco/ Shell garage etc does not mean the fuel has come from Shell direct.
At our Esso depot you see Tesco/ Morrisons/ Shell etc turn up to take fuel, as far as iam aware its only Shell that use an extra additive as they are loading.
There is a golden standard for each grade and most blend in give away for a safety margin to get the tanks on grade so each grade is usually higher in mon/Ron than the pump figure states.

 

I have also found this on a aston db4 at work

 

Mine was mapped on Shell Optimax, always used it and I have never had any problems with it.

 

My old moonstone 3dr was live mapped by Ahmed on Shell Optimax and occassionaly I had to put Super in from other petrol stations. But I usually only just put enough in to get my journey completed and then next time im free i alway filled up with Shell.

Never had any issues and that car got driven very hard.

Defo worth having a paranoia gauge in the car - AFR gauge

 

Ive got a afr gauge in mine. I will just keep on using v power. The reason i asked is ive got a tescos which is about w mile away where as the nearest shell garage is about 6 mile away.

I will just keep on using v power.

 

I have had to do the same a couple of times, I will always try to find a shell Petrol Station to get the V power. I have never had any additional gauges fitted to my Saff as I would be forever watching everything and worrying. Temperature gauge is the only one I keep an eye on.

 

See your original question wasn't quite as clear as that Glenn, Tesco 99 and shell v power have the same octane raiting so you can use either, but bp is only 97ron so you can't use it if mapped on 99.

I've seen a test done before where Tesco made a minuscule more amount of power and torque than v power so it much be good, my dad ran it for years on his Impreza and that got abused.

 

Most people who map cars would not map it on the limit unless asked by the customer as it will cause more problems than its worth.
Its always wise to have a safety margin.

 

Its still bloody scary though when your car is on the dyno rollers!! I had to walk away as I thought the engine would go bang!!

 

Stay away from anything containing more then 5% of ethanol, (so don't put anything labelled E10 or higher in your car) if you don't use it daily, the ethanol will turn the fuel bad in about 2 weeks.

As described before, part of the fuel will become a jelly like substance, and you can't just stir it back into the fuel.

Fuel not containing ethanol if it's not gone stale, eg, less then a few months, it should mix in again.

If you really never use the car, just top it off with aspen4/aspen+ (fooking expensive though), that shit never goes stale, but worth it for storing a vehicle over winter for instance.

 

yeh this is defo scary to watch lol.

 

I always thought tescos had a higher octane reading.

 

Hell yeah most of the cars from work that i take to the rollers are worth anything between 80k upto 1million so not your average car.

Mine was fun on 36psi peak boost on a T34 and in the 12's afr.

 

Does the higher octane necessarily mean it's a better quality fuel though?

I'd never put supermarket fuel in my car

Cheers Paul

 

Paul, super market fuel comes from the same place as the fuel for sale in shell and esso garages.

 

Comes from the same place but does it come from the same batch? Or even the same layer or tank? funny how the last 2 o2 sensors in my car went down just after filling up at Asda on separate occasions, only use shell/bp now

 

Same batch same tank, layer is irrrlevant as tanks need to be homogenous before they can be sold, layering cannot be tolerated for obvious reasons, sampling through all levels is done prior to batching to the bulk plants.
Only difference is if an additive pack is tipped in the trailer unit by the driver.
Only ever seen shell drivers do this at the bulk plant.

 

Change the subject a bit but ive heard a few stories about diesel vehicles having problems due to supermarket diesel.

Apart from the cossie ive always ran my cars on supermarket petrol.

 

Same thing again really Glenn, The super markets don't have their own oil refineries so it all comes from the same place.
There may have been some issues when bio diesel/ fame was first introduced but not sure other than that?.
There is always a small risk of cross contamination/ water if routings are wrong at the bulk plant/ or maybe a contaminated road tanker.