I've been running my motor with the above recently, but I'm not convinced there is any positive impact compared to Esso 97 (with CTHE). Top end power seems to arrive a good 400rpm later.

we don't have 99 here, no tesco, no shell, just esso 97 and BP 97.... it runs well on both, when I ocasionally find 99 in different parts of the country I cant tell...

 

however, in europe with the 102 octane BP stuff it really flies... comes alive and I can feel the difference!

 

the car requires 98 octane..... 97 on esso and BP is the MINIMUM they must make, most of it is probably 98 anyway.

Some test results, I think the comment about ignition control is important also.

The best test surely will always be you driving your car on the fuel you buy on the roads you drive the way you drive.

See how you get on over a year, and 2 years with different fuels.

 

Not many travel around on Rolling Roads, or Dynos.  

Or even drive the same as others driving the identical car.   Then use what you like or suits you.

http://www.tescopfs.com/our-fuel/testing_results

 

Tesco Momentum 99 (99 RON Minimum )

is usually 5 pence a litre more than Tesco Unleaded, or Asda or Morrisons Unleaded. 

so £2.25 a Tank More,  

Shell V Power Nitro (99 RON Minimum) is 5 pence a litre more again, so £4.50 a tank more than Supermarket 95 RON.

http://petrolprices.com

the other UK Super Unleaded (97 RON Minimum obvious cost what ever, where ever.

 

Edited 11 December, 201411 yr by goneoffSKi

I agree but always good to back feeling up with scientific hard facts.

Is she correct on the 98 RON for the 'Shell V Power',  

& now with Shell V-Power Nitro in 2014.  has the Octane been raised to 99 Minimum since 2012 with the name change ?

 

If you are doing hard facts, then you need Ambient Temperatures etc.

 

Because they do not behave the same as on a Dyno if you are driving on a nice 6*oC day with 

no Heat Soak, & a nice cool intake,  or a 26*oC Day.

 

& then they never mention that the Formulation of UK Fuel changes for the Winter 

to make it less Hygroscopic.

(The reason why we used to buy 'Winter Time' Super Unleaded and keep it for the Summer , for Sprints & 1/4 Miles on Bikes and cars,

back in the Days when the BP Super Unleaded first came out. More bang for your buck.)

 

.................

Re a 1.4 TSI Twincharger 1390 cc Standard 177 bhp, (or tuning box or remap, 204 -210 ish BHP)

 

Being Supercharged & Turbocharged, & with a DSG, and the Supercharger available to 3,500 rpm,

& the Turbo Charger on its own from 3,500rpm, 

It is perfectly easy to drive at the other traffics speeds and break the NSL's in D with the DSG changing at 2,400 rpm.

& you can Break the NSL where it is 70 mph and never be anything near 3,500 rpm.

 

So on Turbo below 3,500 rpm with Supercharger on Demand.

That is often where the Good Fuel Economy is, 2,400 - 2,500 rpm

& £2.25 extra a Tank might be worth the price if you get an Extra 30 miles compared to 95 or 97 ron,

& the Cold Starts are smoother, and the Spark Plugs last longer.

(& when you do want Spirited driving there is no Exhaust Emissions Control light flashing at you.)

Edited 11 December, 201411 yr by goneoffSKi

Potentially the pistons will last longer also as the guy who mapped mine made a point that I now need to use 99 Ron fuel. Obviously, he said it would be ok to use super on the odd occasion I was somewhere remote.

thanks  for post as was in Pembrook Dock  and no 99 so will look for 97 .

 

Thanx

Probably no benefit is gained on the 1.2 TSI with 99 ron over 97 ron,

 but then nothing to lose either.

 

Let us know if you notice any difference between, 95, 97 or 99 ron being used, smoother running, or better economy.

A personal view only.

I generally use 97 RON.

I have a standard Fabia VRS and don't drive particularly "enthusiastically", only using maximum acceleration to overtake and generally not exceeding the NSL.

On three occasions I have had the "control system for exhaust" orange warning light stay on after I had started the engine.

On each occasion I just happened to have filled up with 99 RON.

This is not to suggest that I believe there is anything wrong with 99 RON.

However, it may be the case that the ECU detects an unexpected change and reports a fault.

By chance, I was out in the sticks recently and needed to fill up.

I saw a Shell garage and went in to fill up with 99 RON.

The harage only sold regular (95 RON) and so I filled up with that.

I can't say that I noticed any difference at all.

 

I will still try to stick religiously to 97 RON in future - I know it makes sense - for me at least.

Coming on from the other thread,

it would be worth finding out what the 99 ron is showing up as being a problem.

 

Because the Exhaust Control Emission light is unlikely to show because you used 99 ron petrol.

(as long as it was not a mis-fuel,)

 

Worth finding out if you have a failing or fouling Spark Plug, if not already checked, even though the engine has a low mileage.

The ECU will not log Misfires for the VAS to read if there were not enough in a Cycle.

Edited 11 December, 201411 yr by goneoffSKi

As you say SeaGoat maybe a sensor is reading the change as a potential fault while the engine catches up.

I get an extra 30 miles at least on 99 ron. Tesco's 99 ron for me all the way!

Just found a good read however not finished reading as better do some work!

http://www.carbibles.com/fuel_engine_bible_pg3.html

How much does it cost to get the plugs checked by the dealer? I may get them checked when the car is first serviced.

As it happens, the dealer did say that if the problem recurred they would take the car in tor an entire day for a thorough check.

So far as increased MPG concerned - there is too far much variability in my usage (journeys, traffic, etc.) to comment.

Question; what should that Golf be running on?  What do VW specify for that TSi engine?

There is no sense in running that engine on inappropriate fuel.

You do not need to pay anything.

 

Your new car has 3 times had a Exhaust Emissions Control light show while running it on Skodas Prescribed / Recommended fuel,

98 Ron or higher Octane.

 

They put it on the Diagnostics, got no fault code, and you said they gave it a check over.

 

With them knowing about issues that have happened with CAVE & CTHE engines, 

the technician could have spent 20 minutes labour time checking the Spark Plugs,

all 4, not only 1 or 2.

VW,  they do not show this in Brochures or Dealers Showrooms,  but it is there online if you look.

 

http://volkswagen.co.uk/need-help/owners/Fuel

sorry, really, connection.

Edited 11 December, 201411 yr by goneoffSKi

Sorry, connection glitch.

Edited 11 December, 201411 yr by goneoffSKi

SeaGoat how many miles has the car done?

will give 97 a try , as frankly cant tell the diff between 99 & 95, am normal driver (no track days)

FabMonte guessing it a non VRS model and if so don't think you would notice any difference. I doubt there would be much difference on a VRS but my reason for using highest Ron because the end can control the combustion better plus I was told to use it when it was remapped.

One of my mates knows someone who works in the supermarket fuel business. Apparently super fuel is near its sell by date and therefore isnt a good a premium fuels. Im not convinced but it sounds realistic to an extent.

Ask him maybe where all this near going out of date fuel comes from and is stored.

 

Greenergy Producers of Momentum and other fuels & Shell share the importation refining /processing & storage facilities for some areas.

http://greenergy.com

http://en.wikipedia.org/wiki/Greenergy

Edited 11 December, 201411 yr by goneoffSKi