masda74 To Loud Gold Donating Members 4,112 Member For: 13y 25d Gender: Male Location: WA, Perth Posted 15/09/16 06:11 AM Share Posted 15/09/16 06:11 AM finally someone has caught on. BP sometimes goes on special when I have 230ml left in the tank, which usually means I am running on fumes. The surge holds the rest. Once BP goes in and fills the tank, odds are that the next time Caltex is on special, is when I have half a tank of BP. There goes my opportunity to check and see how many km's I get on a tank of BP only fuel. It is then that the 50/50 mix of both fuels allowed me to coin the term Caltex ultimate. Link to comment Share on other sites More sharing options...
MattyP MattyP Cruise Control 6,317 Member For: 12y 7m 22d Gender: Male Location: Central Coast Posted 15/09/16 07:29 AM Share Posted 15/09/16 07:29 AM All petrol is grot Fact! Use the fuel your user manual or tune states factory needs 95, run 95. Running 98 is a waste otherwise Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,988 Member For: 9y 10m 26d Gender: Male Location: South Australia Posted 15/09/16 08:22 AM Share Posted 15/09/16 08:22 AM Not FG but meh. Quote from a BF2 owners manual, "Premium unleaded petrol with a minimum octane rating of 95 (RON) is recommended for use in XR6 Turbo and XR8 vehicles for maximum performance". Maybe someone has a log of what the pcm does to timing under full load if 95 is used? Link to comment Share on other sites More sharing options...
discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 17y 1m 1d Gender: Male Location: Probably above atmospheric pressure Posted 15/09/16 08:26 AM Share Posted 15/09/16 08:26 AM Pretty sure the knock sensors detect the higher resistance to detonation 98 brings and change things (timing?) gradually accordingly over a long period of time. I think all moderns cars do this to some degree? 1 Link to comment Share on other sites More sharing options...
Rab WOT? Moderating Team 10,981 Member For: 11y 10m Gender: Male Location: Frankston, 3199 Posted 15/09/16 08:26 AM Share Posted 15/09/16 08:26 AM Think the FG (MKII at least) has E10 suitable inside the fuel cap cover Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,988 Member For: 9y 10m 26d Gender: Male Location: South Australia Posted 15/09/16 08:28 AM Share Posted 15/09/16 08:28 AM Same sticker on my BF. Link to comment Share on other sites More sharing options...
discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 17y 1m 1d Gender: Male Location: Probably above atmospheric pressure Posted 15/09/16 08:28 AM Share Posted 15/09/16 08:28 AM Yeah my BFII has that as well. Dunno when it started. 2 Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,988 Member For: 9y 10m 26d Gender: Male Location: South Australia Posted 15/09/16 08:30 AM Share Posted 15/09/16 08:30 AM 1 minute ago, -Stever- said: Pretty sure the knock sensors detect the higher resistance to detonation 98 brings and change things (timing?) gradually accordingly over a long period of time. I think all moderns cars do this to some degree? The car pulls timing when it detects knock and returns it when it is no longer present. What I meant from my comment is I wonder if it knocks on 95. 1 Link to comment Share on other sites More sharing options...
Puffwagon Puff Gold Donating Members 15,988 Member For: 9y 10m 26d Gender: Male Location: South Australia Posted 15/09/16 08:37 AM Share Posted 15/09/16 08:37 AM 4 minutes ago, Rab said: Think the FG (MKII at least) has E10 suitable inside the fuel cap cover There is obviously enough fuel in it up top so that the extra oxygen in the fuel still keeps the afr safe. Link to comment Share on other sites More sharing options...
discostig Manual mode ________________________ All day, erryday Donating Members 13,798 Member For: 17y 1m 1d Gender: Male Location: Probably above atmospheric pressure Posted 15/09/16 09:13 AM Share Posted 15/09/16 09:13 AM (edited) 42 minutes ago, Puffwagon said: The car pulls timing when it detects knock and returns it when it is no longer present. What I meant from my comment is I wonder if it knocks on 95. Ah I'm with ya - if it's tuned from factory to utilise at most 95 RON then it won't gain anything more from 98...unless your "95" is a bit crappy and not actually 95, so you need to buy "98" to gain back the lost power Not sure how pure most petrol outlets are in this country, are there any definitive tests around? Probably not worth doing anyway as it varies from site to site and from batch to batch I imagine. Edited 15/09/16 09:13 AM by -Stever- 3 Link to comment Share on other sites More sharing options...
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