95ron vs higher octane fuel, standards and tunes RS's - Focus RS Mk2 Discussion - Focus RS Owners Club

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95ron vs higher octane fuel, standards and tunes RS's

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#1
R5TBE

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where I live super unleaded is about 30mins drive away, I wondered how many of you run standard unleaded (91ron,mainly non UK fuel), premium unleaded (95ron), or higher octane fuel 98+Ron. Do you use it on a standard RS or tuned? I'm also curious to see if any one does or would / recommend using some methanol or other Octane booster mixed in to increase the octane each tankful?

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#2
Robcat

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Hello Thomas. Standard is now 95 RON in the UK. BP ultimate is about 97, and Shell Nitro + is just over 98 RON. I don't travel 15 miles to get Tesco Momentum anymore (supposed to be 99 RON), as I find my car responds better to the Shell Nitro+

All RS's, standard or tuned will benefit a little from the better fuel, but some tuned cars should really run 97/98 if your tuner tells you it is set for it.
Mine is tuned for Shell. i had to drop a bit of 95 in once as I was nearly running out of fuel and they had run out of nitro+ at the pump. I just didn't push it until I could get Nitro+ in the next day.

Forget the octane boosters. They are a waste of money for the gain you get. Just stick with decent fuel in the RS! :nice:

Saying all this, 95 RON won't hurt a standard RS. If you run a few tanks of say Shell Nitro+ through and then go back to 95, you will notice a slight drop in performance I reckon. I did at stage 1 tune anyway.
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#3
RSROG008

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I have always used Shell VPower from new, now I am running MR375.
If it was me I would not run an RS on 95Ron unless it was in an emergency

ROG/RS

#4
brocks

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I never run mine on anything other than SUL (unfortunately nothing better than that available in N Ireland neither 99Tesco or V-Power)...I spoke to Simon at Sitech about this very issue when he was setting up my Revo maps, as the car was on V-Power whilst I was in Scotland...I had the chance to refill prior to mapping with BP Ultimate (same as I use regularly) but was informed that the RS sensors and management compensated almost instantly for a change in fuel octane and not to worry.......

I would imagine that there are minimal performance gains with the higher octane and a larger safety margin, but it could also be the placebo effect of filling with decent fuel :)

#5
Kaye

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Always ran the v power or nitro plus in all my cars...a much better fuel than the standard 95 ron and trust me you notice the drop in performance if you have to go from 98+ to 95 ron after using the 98+
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#6
sig

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Usually use shell nitro but last two tank fulls have been momentum

#7
Cold Fusion

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I only use 95ron in the Lawn mower I even put 99 ron in the wife's Fiesta 1.2 and that has increased the mpg by 4 miles to the gallon.

Nigel.

#8
Bill RS

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Remembered seeing this back in my RS dreaming days, had a quick flick through my old PF and FF magazines (I have them all since I could afford them lol).

Anyways, PF issue March 2012:

Attached File  image.jpg   204.4KB   22 downloads

Standard car with K&N expecting to make 300bhp

Made 263bhp

Operators comments: That's cheap fuel! V-Power Needed!

Most likely some others on here were there that day too, give me a shout if you want yours put up :)

I always use Nitro+ 10p more a litre isn't that expensive..

Cheers,

Bill

#9
R5TBE

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That car still pulled the expected torque tho?! O-o

#10
MarkFRS

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but what a the AFR's like ?
my car is mapped for shell nitro fuel and thats all i use, i once had to use tesco 99 ron and my car run poop

#11
MarkFRS

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i remember a mk1 frs rolling road day i was at years ago, one car turned up with normal 95 ron fuel and AFR's where all over the place and the car was detting!!! (run aborted)
that was a standard car that should have been running super unleaded 97 ron

to add: the guy was told to take it easy and use the 95 ron fuel up, then fill up with shell nitro
then go back for another dyno run,

AFR's were back in line to what they should have been
No Detting

#12
OliRS

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Remembered seeing this back in my RS dreaming days, had a quick flick through my old PF and FF magazines (I have them all since I could afford them lol).

Anyways, PF issue March 2012:

Attached File  image.jpg   204.4KB   22 downloads

Standard car with K&N expecting to make 300bhp

Made 263bhp

Operators comments: That's cheap fuel! V-Power Needed!

Most likely some others on here were there that day too, give me a shout if you want yours put up Posted Image

I always use Nitro+ 10p more a litre isn't that expensive..

Cheers,

Bill


Haha, that is me! I'd had the car a couple of weeks and at the time I wasn't as clued up on the advantage of higher RON fuel, didn't really think it made a difference. I had about a 50/50 mix of Shell 95 and BP Ultimate in the tank at the time.

But this was at Dynodaze near Hinkley, there's been a lot of debate about them and their dyno on various forums and clubs. It was at the RST forum dyno day at the time, everyone who rolled was complaining on the day of being about 30 - 40 BHP down on expected, most of the guys there rolled a lot at various places so they can't all be wrong right? Many a Focus RS and ST has been run their since, always with similar drops in expected power. My car was standard at the time, but the operators also blame it on Ford tuners bigging up their maps and lying about power gains, but in fact their dyno is just no good for high torque cars as per the manufacturers info/spec sheet, but they won't be told. Seems if you don't have a Jap car you don't do well on their dyno :wink:

Incidentally I ran my car at a different dyno shortly after and it made slightly over stock power, although that was on V-Power, then made 360 with Revo stage 1 and more hardware.

The dyno operator argued that if I had V-Power in on their dyno I would have made an extra 40 BHP, just from 99 RON fuel...... wouldn't that be great if it were true!

Anyway for the record, even in standard form I noticed a huge difference in performance and MPG between 95 and 99 RON fuel, after mapping I have never put 95 in, only Momentum 99 or V-Power/Nitro +.
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#13
Robcat

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Haha, that is me!..

...The dyno operator argued that if I had V-Power in on their dyno I would have made an extra 40 BHP, just from 99 RON fuel...... wouldn't that be great if it were true!

Anyway for the record, even in standard form I noticed a huge difference in performance and MPG between 95 and 99 RON fuel, after mapping I have never put 95 in, only Momentum 99 or V-Power/Nitro +.

That all makes sense Oli! :nice:

Don't start me on dyno's. Like you say, I ran well over 40bhp difference on two different dynos with the same hardware and fuel just a few days apart. :rolleyes: They can be so different, although there are sometimes shenanigans going on, I think sometimes they don't set them up properly for the RS/ST's in terms of number of cylinders, correction factors etc. or even the low air pressure on a bad day.

Anyway, whilst I cannot prove the Nitro+ adds any horses, it just feels so much better in the car; it feels sharper. It seem s to pull more consistently with higher torque and without the surging I have had with lower octane fuels.
As it takes time for the engine to adjust upwards with the Shell, I always think it is more noticeable going the other way and having to use a cheaper/95 RON fuel. As the car then runs rougher and feels as flat as a nuns boob almost immediately! :smile:
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#14
Coggers

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where I live super unleaded is about 30mins drive away, I wondered how many of you run standard unleaded (91ron,mainly non UK fuel), premium unleaded (95ron), or higher octane fuel 98+Ron. Do you use it on a standard RS or tuned? I'm also curious to see if any one does or would / recommend using some methanol or other Octane booster mixed in to increase the octane each tankful?


If you look inside the Petrol Cap, it actually states the minimum to run the car on is 95RON (well in the UK) so I wouldn't even think about filling it with 91RON

#15
Andy

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If you look inside the Petrol Cap, it actually states the minimum to run the car on is 95RON (well in the UK) so I wouldn't even think about filling it with 91RON


I wonder if the OP was getting RON and AKI mixed up?

91AKI and 95RON are near enough the same.

#16
RSROG008

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Running your RS on budget fuel is a bit like buying cheap tyres then wondering why it wont go round corners.

ROG :rs:
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#17
Coggers

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Running your RS on budget fuel is a bit like buying cheap tyres then wondering why it wont go round corners.

ROG Posted Image


If the Petrol Station only has 95RON then got no issue putting that in mine, but I try to put Premium in where ever I can.

#18
JS53MES

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I've only ever used shell v power or momentum fuel. I'm sure it even says on the fuel cap minimum of 97 Ron.

#19
jayce

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95 ron on my cap,i would not use 95 only shell or tesco for me

#20
dicky 9439

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I'm keeping quiet on this...



From now on I'm using shell nitro...

Brother always used vpower and stated there was a massive difference. To cut costs I've used the cheaper one. But by doing some extra research and reading everyone's comments I'll be using nitro from now on.
Also the dynos he went to when he had the car the figures were 383 and 389bhp!
Guy at dyno said the best fuel will give you the best results. It's more money for a reason he kept on stating.




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