Forum:
Does using the more expensive higher RON petrols improve the performance of our engines - in particular, mine, the K3-VE?
As the higher the octane the more resistance to knock, my simple brain is telling me that by using it the knock sensor won't signal the ECU to retard the ignition so much or so often. That alone should improve performance, shouldn't it?
Turbo owners swear by higher
Turbo owners swear by higher RON on Japanese motors (Japan Cars are tuned for 100-RON), even though they have been de-tuned for 95-RON fuel we use here in the U.K. On both of my cars I use Shell V-Power (Claimed to be @ 99-RON) as I do feel a difference in performance. As you say the Knock sensor prefers this type of fuel and therefore lets the engine rev better. Even though it cost more than the standard Unleaded. I do beleive that using something like BP's Super equivelant produces less favourable results. Normally the favoured Super Unleaded fuels are either Tescos 99-RON or Shell V-Power.
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'12' Plate Mazda MX-5 2.0 litre NC 3.5 Venture Roadster 160BHP
'15' Plate SEAT LEON 184 FR TDI. 240BHP/500nm Torque.
Past: '53' Plate Yellow YRV Turbo Approx. 150BHP
Fuel
Daihatsu Technical told me some time ago that the engine would readjust to and benefit from 99Ron, but that it may take a few tankfuls.
I tried it but my cranial acceleration sensor didn't notice a difference, although my wishful-thinking sensor might have. I noticed the effect on my bank balance immediately though and desisted.
YRV Tony