95 vs 99 ron - Worth the extra cost

[f00glee]

Even before having mine stage 1 mapped (now requires 99RON exclusively). I only ever used V power or tesco momentum 99. BP ultimate is 97, not 99.

I think the consensus is that it makes some difference in terms of MPG even on a std map so you may break even with cost. Other benefits of cleaning agents etc play a factor too.

Now I'm mapped and pre cat out, I regularly see 45 mpg on a 15 mile trip up the A10 near Cambridge (sat at 50 mph). Long term average is approaching 35mpg and an 80mph motorway run for any kind of distance returns ~38mpg. Pretty happy with these numbers 

Is your map really 99 specific?  Must have a lot of timing!  I can use 95 on my stage 1 tune no probs and have done many times

Good mpg.  I never drive slow enough to see anything above 30 on the short term average, but my long term average is hanging around 31mpg at the moment.  Was 27 before I replaced the cam sensor 

I would assume so. The guys at r tech request 99RON fuel before mapping so I guess that's what the map is based on!


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[pudding]

Don't R-Tech maps come with 5 switchable maps for lower octane?

[f00glee]

Don't R-Tech maps come with 5 switchable maps for lower octane?

You're right about the switchable maps being present, but for me octane wasn't a consideration/ever mentioned (other than specifying 99 had to be in the tank). I wanted to be able to drop the power temporarily if my clutch starts to struggle at some point in the future (std clutch) or if I have to let someone else drive for any reason...

For me map 1 is "stock" power, 4 has torque capped below 300lbft and 5 delivers the full beans 320odd lbft. 2 and 3 aren't so much "proper" maps - just map 4 again with further reduced boost levels to bring the torque down even more. HP comes down with the reduced torque. Obviously the car sits in 5 99.9% of the time :D though it is fun dropping it into map 1 for a few minutes to be reminded how much oomph has been gained.

Sorry for the slight thread hijack!






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[Molesy]

My car lives on Shell Nitro+, i can tell the difference with other cheaper supermarket fuels so they only go in if nothing else is around. I'm lucky that I drive past a Shell, Esso and BP on the way to work and the Shell is generally the cheapest!

[gtipirelli]

I have a mapped Pirelli edition and it just feels flat on 95 Ron fuel. It really takes off on momentum 99 so always use that

No idea if I get better mpg. The performance on tap is more important