Im hopping to have my engine rebuilt and a power fc full stainless exhaust (de-cat).
i know that you should only use 99 oct in a fd but i have used others when im only going round town because tesco and shell is so far away from where i live.
i spoke to pip and carl they can map the car for me on both 95 or 99 oct but what is the general oct that people use and what can be the up and down side of these different oct fuels?
Most people run vpower as that\'s what most builders recommend to use. Sometimes I have had to put other fuel in because there isn\'t a convenient shell garage around. I just put enough in so that I can fill it up soon with vpower. And I don\'t give the car stick if I have rubbish fuel in.
so is it safe to say that i should get the new ecu mapped to 99? what is better v-power or tesco 99 been googleing but its seem to be lots of mixed ideas
You can map to 98/99 and use the 95 stuff but dont give it stick because the car will only be expecting the better fuel.
You could just map to the 95 fuel and then you will always have the right stuff in the tank. You will have a little less power and the tuner may choose to decrease the rev limit. For example when I was mapped to 99 ron my limit was 8,100 rpm and now im on 95 ron my limit is 7,800rpm. When I got mapped to the 95 fuel I did so when I put a new rebuilt engine in - I had 1bhp more @ same boost so I cant comment on what the performance loss would be normally.
Vpower seems to be the best. Prety consistent in this country but if you leave it stood for a couple of months best to top it up with fresh fuel. Run it down to empty and fill it back up again. The cost of one tank is far cheaper than a rebuild
I\'ve read that Tesco 99 has a lot more ethanol added to it and as such is subject to quicker degradation of RON and a more variable RON. Basically, not as high quality as VPower!
i read that about tesco fuel too
I\'ve never managed to have Tesco fuel in my FD long enough to worry about degradation! :Giggle
thanks guy so 99 oct is it then
Quote from: gonzoninja;804671I\'ve never managed to have Tesco fuel in my FD long enough to worry about degradation! :Giggle
Heh, true, but how long has it been sitting in the tank below the forecourt before you fill up?
True.
My personal feeling is to map for the lowest common denomintor, I will always fill up with super unleaded, so mine\'s mapped on BP 97 Ron fuel.
While I have used 99 Ron Tesco stuff it is from fairly busy forecourt (Tesco\'s in Broadbridge Heath), tons of imprezas and evos fill up there so I think the fuel is pretty fresh. I\'m sure someone will tell me that\'s incorrect.
This makes for interesting reading in compering v power with tesco 99
Cheers,
http://www.thorneymotorsport.co.uk/tuning/Fuel_Test_Results_Update.shtml
I just put diesel in mine. Makes for better mpg :p
Adam
I run Heinz 57 petrol in mine,4000 miles n it loves it.
Quote from: festa;804799This makes for interesting reading in compering v power with tesco 99
Cheers,
http://www.thorneymotorsport.co.uk/tuning/Fuel_Test_Results_Update.shtml
yes its very interesting thanks for that and it seem tescos is taking over the world but where can u even find bp 102 i have never ever seen it.
Probably doesn\'t help you being in Sheffield but the BP station in Portsmouth selling it. I think there\'s a BP station near Snetterton that does too!
And I always thought V-Power was the best!
"The Tesco 99 fuel again outperformed V Power in all the tests but the differences between the two fuels were marginal and we doubt most people would tell the difference in their cars on a day to day basis. However the Tesco fuel was the most consistent."
"Bottom line? Use the Tesco 99 fuel where you can find it, it offers the best, most consistent performance of the fuels available and it’s cheaper than V Power. If you can’t find a Tescos that sells it then go for Shell’s V Power."
Please note their tests were with NA engines not turbo ones.
IN regards to Turbo Rotaries, due to Tesco putting Ethonal into the fuel, you have to get you tuner to increase the fuel volume in the map otherwise it will run too lean on boost if mapped on the edge.
Personally when I have used Tesco my afrs showed a few points leaner on boost. I always use V power now, but I have mapped my car on the lower boost cells and cruise so it can use 95 octane