££ One quick Subaru Question, please ££
Discussion
I was very recently lucky enough to aquire a SUBARU IMPREZA STI TYPE UK 55, I read up all about them as you do before purchasing such an animal.I read about the spoiler, did you know that its not just there to add to its looks nor is it there for its aero-dynamics, its main purpose is too lean on when you spend all them long and expensive hours filling it up with juice.I have read about how much they like a drink, but reading and actually witnessing the never ending thirst are two different things, but of course I wouldnt change the car for anything,... So here is the question, (probably the first of many)
Which fuel is best for a 55 Subaru Impreza STI TYPE UK,
A. Shell V Power
B. Tesco 97
C. Tesco 98
D. Tesco 99
Please answer A,B,C or D and feel free to elaborate as all imformation is greatly received.
Cheers Deano.
Which fuel is best for a 55 Subaru Impreza STI TYPE UK,
A. Shell V Power
B. Tesco 97
C. Tesco 98
D. Tesco 99
Please answer A,B,C or D and feel free to elaborate as all imformation is greatly received.
Cheers Deano.
Don't put Sainsburys 97RON or BP Ultimate 97RON in your Scooby!! 
Tesco 99RON and V-Power are the ones to go for. If there is no Tesco 99RON which is my first choice then V-Power will do nicely although a bit more expensive.
Apparently V-Power gives better knock protection and Tesco 99RON a bit more power. Either way i don't think you can go wrong and it all depends on what's available, and do you mind spending the extra few ppl for V-Power regularly.
I'll stick with Tesco 99RON and a bit of Millers Octane Booster for regular use on catted scoobs, and Millers CVL Turbo Octane booster for the odd trackday or run at the POD once in a while (not for regular use as will damage your cats eventually so absolutely fine now and again).
Don't just take my word for it....read about it yourself
http://www.greenergy.com/tesco_99_octane/index.htm...
Tesco 99RON and V-Power are the ones to go for. If there is no Tesco 99RON which is my first choice then V-Power will do nicely although a bit more expensive.
Apparently V-Power gives better knock protection and Tesco 99RON a bit more power. Either way i don't think you can go wrong and it all depends on what's available, and do you mind spending the extra few ppl for V-Power regularly.
I'll stick with Tesco 99RON and a bit of Millers Octane Booster for regular use on catted scoobs, and Millers CVL Turbo Octane booster for the odd trackday or run at the POD once in a while (not for regular use as will damage your cats eventually so absolutely fine now and again).
Don't just take my word for it....read about it yourself
http://www.greenergy.com/tesco_99_octane/index.htm...Edited by ScoobieWRX on Monday 17th March 22:46
there is nothing wrong with sainsburys 97 octane.. i have been using it for 2 years without any probs and from some of the performace cars in the forecort on a saturday morning none of them are complaining
Use Tesco stuff the stuff that fff up the lambda sensor
Use Tesco stuff the stuff that fff up the lambda sensor
Edited by stevieb on Monday 17th March 23:02
Edited by stevieb on Monday 17th March 23:03
Well Stevieb you enjoy your 97RON along with those other performance car drivers that don't know any better 
but you are in a minority of Scooby drivers that still use 95/97RON. Some do but personally i wouldn't.
All the Scooby drivers i know use either V-Power or Tesco 99RON and i have been using Tesco 98/99RON regularly, and V-Power now and again when i have no choice, since i had my car (3yrs), and my Lambda sensor is in fine fettle!! I've never had bad Tesco fuel yet from any Tesco filling station i've ever used in the UK (Inc Scotland)!!
Horses for Courses i suppose but i wouldn't ever recommend 97RON to any Scooby driver!!
but you are in a minority of Scooby drivers that still use 95/97RON. Some do but personally i wouldn't. All the Scooby drivers i know use either V-Power or Tesco 99RON and i have been using Tesco 98/99RON regularly, and V-Power now and again when i have no choice, since i had my car (3yrs), and my Lambda sensor is in fine fettle!! I've never had bad Tesco fuel yet from any Tesco filling station i've ever used in the UK (Inc Scotland)!!
Horses for Courses i suppose but i wouldn't ever recommend 97RON to any Scooby driver!!
ScoobieWRX said:
Well Stevieb you enjoy your 97RON along with those other performance car drivers that don't know any better but you are in a minority of Scooby drivers that still use 95/97RON. Some do but personally i wouldn't.
All the Scooby drivers i know use either V-Power or Tesco 99RON and i have been using Tesco 98/99RON regularly, and V-Power now and again when i have no choice, since i had my car (3yrs), and my Lambda sensor is in fine fettle!! I've never had bad Tesco fuel yet from any Tesco filling station i've ever used in the UK (Inc Scotland)!!
Horses for Courses i suppose but i wouldn't ever recommend 97RON to any Scooby driver!!
Depends what you use your car for... Daily drive when you are not ragging it to and from work 97 or 95 octane will do no long term harm. the Denso ECU adjusts to retard the ignition to prevent any engine damage. But driving on a track day or a sunday hoon thats a different story.. V-power or 99 with octane boost is a must. But you need a couple of tanks for the ECU to learn the new octane level. but you are in a minority of Scooby drivers that still use 95/97RON. Some do but personally i wouldn't. All the Scooby drivers i know use either V-Power or Tesco 99RON and i have been using Tesco 98/99RON regularly, and V-Power now and again when i have no choice, since i had my car (3yrs), and my Lambda sensor is in fine fettle!! I've never had bad Tesco fuel yet from any Tesco filling station i've ever used in the UK (Inc Scotland)!!
Horses for Courses i suppose but i wouldn't ever recommend 97RON to any Scooby driver!!
Also my local sainsburys is supplied by Shell so 97 octane from shell cant be to bad..
My motor has now done 63k miles and has had no faults to date.
a Mildly tuned Skyline and a 400Bhp Supra cant be wrong using it. Sorry i jsut dont buy into the marketing hype of v-power.
Edited by stevieb on Monday 17th March 23:50
The Deano said:
I was very recently lucky enough to aquire a SUBARU IMPREZA STI TYPE UK 55, I read up all about them as you do before purchasing such an animal.I read about the spoiler, did you know that its not just there to add to its looks nor is it there for its aero-dynamics, its main purpose is too lean on when you spend all them long and expensive hours filling it up with juice.I have read about how much they like a drink, but reading and actually witnessing the never ending thirst are two different things, but of course I wouldnt change the car for anything,... So here is the question, (probably the first of many)
Which fuel is best for a 55 Subaru Impreza STI TYPE UK,
A. Shell V Power
B. Tesco 97
C. Tesco 98
D. Tesco 99
Please answer A,B,C or D and feel free to elaborate as all imformation is greatly received.
Cheers Deano.
A and D are actually closer in price now than ever before Which fuel is best for a 55 Subaru Impreza STI TYPE UK,
A. Shell V Power
B. Tesco 97
C. Tesco 98
D. Tesco 99
Please answer A,B,C or D and feel free to elaborate as all imformation is greatly received.
Cheers Deano.
So it's down to which is your nearest as you'll be visiting that particular petrol station the most. I wouldn't put B or C in my sti unless there was no alternative, and then I'd not over-rev it until I'd managed to fill up with the 99 ron again later. If it's not already been mapped, regardless of whether you've got it modified or not, get it mapped by someone respected in the industry. This will at the least improve your fuel economy in the long run and also provide you with a few more horses and better low down and midrange grunt
Just noticed your from Merseyside in your profile. Come along to our next meeting: www.scoobysmacs.co.uk we've a few members from that area
Hope to see you next month Edited by cw42 on Tuesday 18th March 07:53
Tesco99 or V-Power but most of the time it's Tesco99. I think the important thing is to be consistent, swapping and changing between different fuels isn't good. The ECU takes at least a tank to reset to the new fuel. It alway worries me that if I swap from 99 to 97 the car is doing a couple of hundred miles with the wrong ignition timing.
stevieb said:
Depends what you use your car for... Daily drive when you are not ragging it to and from work 97 or 95 octane will do no long term harm. the Denso ECU adjusts to retard the ignition to prevent any engine damage. But driving on a track day or a sunday hoon thats a different story.. V-power or 99 with octane boost is a must. But you need a couple of tanks for the ECU to learn the new octane level.
Also my local sainsburys is supplied by Shell so 97 octane from shell cant be to bad..
My motor has now done 63k miles and has had no faults to date.
a Mildly tuned Skyline and a 400Bhp Supra cant be wrong using it. Sorry i jsut dont buy into the marketing hype of v-power.
It doesn't matter to me if i'm ragging my car or otherwise, i want it running tip top all the time, not just when i'm going to track it, so i put the best fuel in that i can, and it isn't 95/97RON. Also my local sainsburys is supplied by Shell so 97 octane from shell cant be to bad..
My motor has now done 63k miles and has had no faults to date.
a Mildly tuned Skyline and a 400Bhp Supra cant be wrong using it. Sorry i jsut dont buy into the marketing hype of v-power.
I have an idea how the Denso ECU works, i've been mapping my own for the last 12mths or so. I know what happens when you use 95RON/97RON on a standard OEM map, and you hoof it.
Within 100 or so miles of driving on your first tank full of 99RON the DENSO ecu knows exactly what fuel is in your tank, it doesn't need a couple of tank fulls as it actively checks for knock the whole time and is learning the whole time.
However the best thing to do is reset the ECU and within a short while it's learned the new fuel settings and you're getting near as damn it 95% best use, thereafter all the fine learning is done over a few further miles. Also in hot weather i know i would rather be using 99RON over 95/97RON to further reduce the possibilities of DET.
The koenigsegg CCX develops 800bhp on 95RON but stick 99RON in and it develops another 100bhp over 95RON. Chuck E85 in and you're making another 218bhp over 95RON. I would love to be using E85 even though it would be a heck of a lot thirstier, but right now it's tough to get hold of so i'll stick to 99RON for the foreseable.
I agree with you, i don't buy into all the V-Power marketing hype either, and you're paying extra for the name, just like everything else in life, which is why i use Tesco 99RON. If you are hell bent on using 95/97RON get it mapped accordingly and you will probably see some benefit over leaving it standard.
ScoobieWRX said:
stevieb said:
Depends what you use your car for... Daily drive when you are not ragging it to and from work 97 or 95 octane will do no long term harm. the Denso ECU adjusts to retard the ignition to prevent any engine damage. But driving on a track day or a sunday hoon thats a different story.. V-power or 99 with octane boost is a must. But you need a couple of tanks for the ECU to learn the new octane level.
Also my local sainsburys is supplied by Shell so 97 octane from shell cant be to bad..
My motor has now done 63k miles and has had no faults to date.
a Mildly tuned Skyline and a 400Bhp Supra cant be wrong using it. Sorry i jsut dont buy into the marketing hype of v-power.
It doesn't matter to me if i'm ragging my car or otherwise, i want it running tip top all the time, not just when i'm going to track it, so i put the best fuel in that i can, and it isn't 95/97RON. Also my local sainsburys is supplied by Shell so 97 octane from shell cant be to bad..
My motor has now done 63k miles and has had no faults to date.
a Mildly tuned Skyline and a 400Bhp Supra cant be wrong using it. Sorry i jsut dont buy into the marketing hype of v-power.
I have an idea how the Denso ECU works, i've been mapping my own for the last 12mths or so. I know what happens when you use 95RON/97RON on a standard OEM map, and you hoof it.
Within 100 or so miles of driving on your first tank full of 99RON the DENSO ecu knows exactly what fuel is in your tank, it doesn't need a couple of tank fulls as it actively checks for knock the whole time and is learning the whole time.
However the best thing to do is reset the ECU and within a short while it's learned the new fuel settings and you're getting near as damn it 95% best use, thereafter all the fine learning is done over a few further miles. Also in hot weather i know i would rather be using 99RON over 95/97RON to further reduce the possibilities of DET.
The koenigsegg CCX develops 800bhp on 95RON but stick 99RON in and it develops another 100bhp over 95RON. Chuck E85 in and you're making another 218bhp over 95RON. I would love to be using E85 even though it would be a heck of a lot thirstier, but right now it's tough to get hold of so i'll stick to 99RON for the foreseable.
I agree with you, i don't buy into all the V-Power marketing hype either, and you're paying extra for the name, just like everything else in life, which is why i use Tesco 99RON. If you are hell bent on using 95/97RON get it mapped accordingly and you will probably see some benefit over leaving it standard.
Fed up of all the crap being banted about on scooby net with people with there cocklinks (knocklinks) and the worryguages. (Oil Temp, Oil Pressure, Boost). can be bothered with it to be honest.
Edited by stevieb on Tuesday 18th March 10:53
As far as i am aware Denso equipped UK scoobs are mapped 95RON safe from the factory not 97RON. Some cars have a sticker in the fuel filler or on back edge of the drivers door saying use superunleaded only, but the ECU itself is mapped for 95RON.
It will however take advantage of and slightly advance timing when you run superunleaded to produce a little bit more power without detting. Running higher RON fuel on the standard map many people have reported their cars driving more smoothly, having less noticeable power drop in hot weather, and making a few extra mpg compared to 95RON.
P.S. People with modified scoobs run these 'worry guages and cocklinks' for good reason. I assume your car is bog standard therefore why would you want to use them...you don't need them
It will however take advantage of and slightly advance timing when you run superunleaded to produce a little bit more power without detting. Running higher RON fuel on the standard map many people have reported their cars driving more smoothly, having less noticeable power drop in hot weather, and making a few extra mpg compared to 95RON.
P.S. People with modified scoobs run these 'worry guages and cocklinks' for good reason. I assume your car is bog standard therefore why would you want to use them...you don't need them
Edited by ScoobieWRX on Tuesday 18th March 12:46
If you use lower octane rated fuel the ecu will compensate and you wont make as much power , its that simple.
My Skyline has a power fc so no knock control but it gives a knock reading if i use Tesco 99 i get a higher knock reading than if i use v power.
with v power i get up to 20 recorded
with Tesco 99 i get up to 60 recorded
With BP Ultimate i noticed and got off the throttle quick .....134 recorded
that suggests to me V power has better resistance to det than other fuels
My Skyline has a power fc so no knock control but it gives a knock reading if i use Tesco 99 i get a higher knock reading than if i use v power.
with v power i get up to 20 recorded
with Tesco 99 i get up to 60 recorded
With BP Ultimate i noticed and got off the throttle quick .....134 recorded
that suggests to me V power has better resistance to det than other fuels
Shell V-Power will give the best performance as the cars ecu constantly monitors for detonation and will advance ignition timing according to that! the RON figure of the fuel means next to nothing on a turbo charged engine due to the way it is tested, MON is much more appliacable, but unfortunatly to the best of my knowledge Shell have not realeased figures on v-power but from what we have seen v-power although the same RON as Tesco 99 does give better performance, my guess due it having a higher MON rating!
Also worth taking into consideration is that due to Tesco 99 being a bio fuel it also has a lower calorific value than v-power, put simply meaning you get less bang for your buck! from memory Tesco 99 is 5% bio-ethanol, with the ethanol content containly roughly half the calorific value of regular gasoline meaning 2.5% lower overall.
Also worth taking into consideration is that due to Tesco 99 being a bio fuel it also has a lower calorific value than v-power, put simply meaning you get less bang for your buck! from memory Tesco 99 is 5% bio-ethanol, with the ethanol content containly roughly half the calorific value of regular gasoline meaning 2.5% lower overall.
Thorney Motorsport say quite the opposite about Tesco99 and V-Power and they have tested all three higher octane pump fuels to include BP 102RON.
It may well be a case of horses for courses though and depend on a whole host of factors apart from ambient temps and condtions on the day of dyno testing. I don't think Thorney tested their fuels out on a turbocharged car so it may be V-Power is better for Turbo cars. Who knows?!?!
Either way IMHO using V-Power or Tesco 99RON you won't go far wrong, however in the main i think we all agree BP 97RON is not the way to go for Scoobs or other Jap performance machinery.
It may well be a case of horses for courses though and depend on a whole host of factors apart from ambient temps and condtions on the day of dyno testing. I don't think Thorney tested their fuels out on a turbocharged car so it may be V-Power is better for Turbo cars. Who knows?!?!
Either way IMHO using V-Power or Tesco 99RON you won't go far wrong, however in the main i think we all agree BP 97RON is not the way to go for Scoobs or other Jap performance machinery.
ScoobieWRX said:
Thorney Motorsport say quite the opposite about Tesco99 and V-Power and they have tested all three higher octane pump fuels to include BP 102RON.
It may well be a case of horses for courses though and depend on a whole host of factors apart from ambient temps and condtions on the day of dyno testing. I don't think Thorney tested their fuels out on a turbocharged car so it may be V-Power is better for Turbo cars. Who knows?!?!
Either way IMHO using V-Power or Tesco 99RON you won't go far wrong, however in the main i think we all agree BP 97RON is not the way to go for Scoobs or other Jap performance machinery.
I fully agree and do a search on most jap performance websites regarding this subject and its V power recommended by all.It may well be a case of horses for courses though and depend on a whole host of factors apart from ambient temps and condtions on the day of dyno testing. I don't think Thorney tested their fuels out on a turbocharged car so it may be V-Power is better for Turbo cars. Who knows?!?!
Either way IMHO using V-Power or Tesco 99RON you won't go far wrong, however in the main i think we all agree BP 97RON is not the way to go for Scoobs or other Jap performance machinery.
Surely if its good for a turbo car it must have the same benefits to a N/A engine albeit not as much power gains.
Cheers thanks very much for all your replies,you have all been a great help,a few of you started to lose me a bit at times, I think a few of you slipped into the Japanese lingo..... Basically I think you are all saying Tesco 99 is fine to use but most of you think V Power just edges it.
Thanks for the invite cw42 I may pop down soon.
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