matth76 1 Posted December 30, 2005 Report Share Posted December 30, 2005 HiI noticed a while back Tesco were trialing 99 octane rated fuel in a few select garages. They now do it in virtually every superstore garage. Is it damaging to run the car on a high octane rated fuel or use octane booster?My car certainly feels smoother running on the Tesco 99 fuel. However I know the car won't obviously gain any power unless it has a remap when the car is full up on the 99 ron fuel, on a rolling road. Has anyone had their car remapped (if you have a remappable Dastek ECU or similar) to run on 99 ron fuel - what kind of power gains did you get running on it?Is a Dastek ecu self learning like the standard ECU on the ODB2 Golf VR6 or does it require a remap each time something is changed? Link to post Share on other sites
mightyvr6 0 Posted December 30, 2005 Report Share Posted December 30, 2005 Theres nothing wrong with running on high octane fuel (apart from the cost) Its actually better running it on super than ordinary unleaded. Your car will run better and give more power on higher octane fuel but you have to work out whether the extra cost is justified for a few bhp gain. Link to post Share on other sites
Seademon 0 Posted December 30, 2005 Report Share Posted December 30, 2005 My Tesco sells 99 Octane at the pretty much the same price as every where else sells unleaded so I use that all the time - it runs smoother and pulls better when using it. Link to post Share on other sites
shail 0 Posted December 30, 2005 Report Share Posted December 30, 2005 Heres a list of Tesco's that are doing it.http://www.greenergy.com/products/99_octane_locations.html Link to post Share on other sites
matth76 1 Posted December 30, 2005 Author Report Share Posted December 30, 2005 Yeah my local Tesco supermarket garage is actually cheaper than BP super unleaded and Optimax. Link to post Share on other sites
FishWick 21 Posted December 31, 2005 Report Share Posted December 31, 2005 I don't notice any difference with 99 than Optimax tbh. Evo magazine tested all the different fuels recently and apart from the Sunoco race fuel, they rated Optimax as the best all rounder. They tested all the fuels on a dyno using a MK5 GTI.The advantage of high octane is relaxes the knock sensors, so it tunes itself, no need for a remap tbh. If you did map the base timing for 99 ron, then you'd be stuffed if you had to use 95. Link to post Share on other sites
TVR6 0 Posted January 1, 2006 Report Share Posted January 1, 2006 Thanks Shail, Hayes Bulls Bridge is my nearest I have used Octane booster in past cars which raises the ron rating by a few points and found it to increase torque and responsiveness, which I expect would be the same thing... Link to post Share on other sites
mk3anni 0 Posted January 2, 2006 Report Share Posted January 2, 2006 I ran mine on tesco 99, it didn't like it, it seems to pull better on BP ultimate or Optimax. Link to post Share on other sites
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