Shaun Patterson wrote:i only ever use caltex up here, the bp 98 feels some much slower
Probably sourced from a different location?
merlin wrote:Can I ask that all cars booked for tuning be fueled with 98 octane fuel, from either BP or Shell. Please avoid Caltex, as I have had three cars for tuning this year that were fuelled with Vortex98 that were definitely not 98 octane. Noticeable knock was evident and the ECU was interpolating into the LOW octane fuel and spark maps. When the cars were re-presented with true 98 then there was no knock issues.
After the tune is done with 98, is 95, e10 (94/95 rated), or even standard unleaded able to be used still with benefit? I realise that 98 octane is better, but even now it has been up to 25 cents a litre more expensive than e10 etc. Also 98 octane isn't always available, and if it is since it is up to 25 cents a litre more expensive the turnover would be much lower. It may be the reason for the pinging with the Caltex 98, fuel becoming stale?