esxboy1

hi guys im running 97uksti highly modded,whats the deal with fuel on scoobys ?everyone talks about shell v power etc surely the more ron number the better ie shell v power is 98 ron but i use tesco`s 99 ron super duper fuel surely thats better than v power everyone keeps talking about?

53

iTrader: (41)

Never had any problems with Tesco 99 but always felt more positive running V-Power.

zs_phil

iTrader: (1)

i used to use tescos 99ron but strangely enough i get more miles out of Total regular unleaded by quite alot .
but if im going by shell because its a 15 mile drive ill fill it up with v power because it transforms my car anyway feels so much smoother and get miles more mpg than tesco 99ron

esxboy1

thats strange you get more mpg with shell but you got less chance of engine probs using the higher octane based fuel ie 99 ron

esxboy1

well im asuming its better.so is the general census is shell v power its just im have a mapping sesion an i want to fill with the best fuel before hand

zs_phil

iTrader: (1)

uk cars are mapped for 95ron anyways so wont do any engine damage but id put v power in it if you are near one but everyone has there favourite ,some like ultimate but i think its sh1te

ZEN Performance

UK cars are not mapped for 95 ron, they are tolerant of it, in bog standard form. Many people have modded cars, decats and the like, in which case there is no guarantee that the OE map will be okay, I know of many situations where it most certainly is not.

esxboy1

ok my car spec is fmc,vf 28,550 inj,full decat,up+down pipe,headers,apexi ind,power fc, avcr.what fuel would you recomend for remap if it makes a difference

STi5_TypeR_VLtd

Optimax was 98RON but V-Power is 99RON. I use both V-Power and Tesco99 in both the Sti Wagon and Type R with similar performance (seat of pants) between the 2. Certainly I dont see any more knock with 1 type of fuel, but I do add a bottle of Millers Octane Plus to every tank full. In theory this takes the RON over 100 which the engines are mapped to (JDM mapping)

Rob

Klaatu

There was a time when "5 star" was available at the pumps, 105RON if memory serves.

mystic_magic

You guys are lucky, on the isle of wight the only super we have is texaco ****. its only 97ron.

from the factory my car has a sticker saying 98ron only

to make it worse when the previous owner had a re-map he was running optimax and an octane booster, so really it wants 99/100 lol

goes ok on 97, i put in a booster when i can be bothered(afford lol)

when ever im in southampton im straight for the vpower though, it loves it <3

scooby lude

yes we only got harwards over here on i.o.w .one prpb is thry keep running out.lol.where you live btw.

dynamix

iTrader: (3)

Recent testing of mine:

Same map on the ECU.
Same Wideband O2 sensor

Tesco 99 shows 11.16 AFR
Vpower shows 10.8:1 AFR

Tesco is blended with 5% bioethanol to raise the octane along with other benefits but from what I read it is blended on a lower quality base fuel to Shell VPower.

I think the short answer about which is best depends on what your car is mapped for but I would never put even normal super in mine let alone 95 ron unless it was running on fumes and only then enough to get me to the next proper petrol station.

If you have ever monitored your ecu when you have put this lower quality stuff in, you would make the same decision.

mystic_magic

Im Matthaus off Evo cars 'view my scooby' and you'll probably remember it, im the one that takes all the photos of everyone/thing

scooby lude

yep i remember you , see you about now and again......no we havnt much choice in fuel on this i.o.w so we have to make do or use nf.still prices of fuel keep going up and up

mystic_magic

Its damn annoying we pay currently like 112.9 for crap 97ron texaco crap when nice juicy 99ron vpower is anything upto 10p per litre less over the pond