These are the findings of my research in to this;
1) Fuel additives classed as Octane boosters are a waste of money. None of them increase the fuel octane, and some of them actually reduce it. They are in fact a waste of money especially at £20 for a small tin for the "better" ones.
2) On remapped cars the BP102 will make a difference. However it will take a while for the ECU to adapt as mentioned above.
3) Cars with maps that can be adjusted should be set for higher spec fuel mode as soon as the car is running purely on BP102. In other words, fill it with BP102 when there is nothing but fumes in the car, run it for a few miles then adjust the ecu accordingly. It is possible that 5-10% power gain can be achieved just with the car set to run on this better fuel.
To put that in to perspective, on an Edition 30 with a Revo map and approx 310bhp, the timing could be increased from 5 (normal fuel) or 6 (V-Power) to 8 or 9 for BP102. Boost could be upped from the standard setting of 6 to 7 safely or possibly 8, but you may see fuel cuts due to limitations on the pump (see point 4 below). With it all set, with a 5% gain on 310bhp, you would see 325bhp. With a 10% gain you would see 351bhp. Too good to be true? Turns out Revo were involved with the development of the BP102 fuel and tuned the 911 that saw the massive gain. Kev at Revo is pretty enthused by BP102 and recommends it. You do however need to consider things like cooling and the fact that excessive heat and hot air in to the engine is gonna pull things back a little especially if you are running a standard intercooler. On the 1/4 mile, letting the car cool between runs would be a good idea.
4) On the TFSi, fuelling to the engine is still the limiting factor, so adjusting boost up will still run in to the same problems (fuel cuts/running lean) as with lower spec fuel like V-Power as the fuel pump is the limiting factor. Looking at
www.briskoda.net, looks like some of the lads over there have either replaced their pumps, or the guts of the pumps they have, and with stage 2 software are coming pretty close to 300bhp on the 200bhp K03s turbo TFSi engine as found in MK5 the Golf GTi as they can put enough fuel through to cope with higher boost. On the Edition30, this should equate to 340-350bhp with the aid of an intercooler, full exhaust and uprated air intake.
In my humble opinion, with all this considered, you are probably looking at about a 5% gain unless you have uprated your fuel pump and have an intercooler and then you would probably manage the suggested 10% gain. Only snag is at approx £2.50 a litre, a 20 litre jerry can would be £50 but that is only £30 more than a 500ml octane booster that has been proved not work. Other race fuels can be attained for just under £2 a litre, but is probably not cat safe like the BP102 seems to be.
Therefore;
On a MK5 Golf GTi with a remap, you could be looking at 250 * 1.05 = 262.5bhp
On a MK5 Golf Ed30 with a remap you could be looking at 310 * 1.05 = 325.5bhp
Not a huge difference on the road or track, but it may help you pip someone else where it counts on the 1/4 mile.
