bodilx6 Posted December 10, 2007 Share Posted December 10, 2007 Just saw an old episode of Fifth Gear where they tested BP and Shells top gas vs a supermarked brand. Performace cars (subaru impreza) showed to get a nice gain from using this petrol But... is this due to the higher octane rating or due to the fancy additives in fx Ultimate? The test showed that the reason for this hp gain (something like 5%) was due to the car being able to adapt to the new type of petrol. Will the supra, taking its age into considertion, be able to do the same? I always run 98 octane, but will there be a gain to switch to Ultimate or whatever they are called locally (in dk Shell is called V-Power)? Have anyone actually tested and documented the supra for differences between running 91, 95 or 98 octane? Link to comment Share on other sites More sharing options...
tooquicktostop Posted December 10, 2007 Share Posted December 10, 2007 I remember reading on here I think that Tesco 99 was one of the best, I paid £1.14 for super unleaded yesterday in Brentwood, its a joke really, at that price it should all be bloody fantastic Link to comment Share on other sites More sharing options...
Ark Posted December 10, 2007 Share Posted December 10, 2007 Supras take a fookin' age to adjust their own maps, but they do. Imprezas use more modern ECUs, and are a little more flexible - the wife's one certainly gets more miles out of V-Power than Tesco 99, but power is arguable. Link to comment Share on other sites More sharing options...
tbourner Posted December 10, 2007 Share Posted December 10, 2007 Does it HAVE to have an ECU reset or will it just take longer without one? Apparently my Honda has knock sensors and all the goodies, but I get worse economy a some hesitation with super! Just use the cheap stuff now. Link to comment Share on other sites More sharing options...
carl0s Posted December 10, 2007 Share Posted December 10, 2007 The turbo Supras love higher RON fuel. I could easily notice a difference, plus you're risking detonation with anything above stock boost with any other type of fuel. Some would say you're risking det even with stock boost on a Jap import. The non turbos don't seem to show any benefit. I can't really see how the engine could re-adjust to the higher RON fuel quickly without risking damage to itself. It would surely have to advance the timing in very very small increments or something. If it just went "oh, let see if we've got better fuel yet.. advance all the way. DET. oops, nope, still shit fuel, almost broke a piston" it wouldn't be too good. Link to comment Share on other sites More sharing options...
tbourner Posted December 10, 2007 Share Posted December 10, 2007 I thought knock sensors were constantly adjusting the fuel a tiny weenie bit at a time and decting knock and then bringing it back, so you're effectivly always on the edge of the fuels ability? Link to comment Share on other sites More sharing options...
carl0s Posted December 10, 2007 Share Posted December 10, 2007 I thought knock sensors were constantly adjusting the fuel a tiny weenie bit at a time and decting knock and then bringing it back, so you're effectivly always on the edge of the fuels ability? I dunno. I suppose it has to work that way, but isn't it bad to be constantly inducing knock? Hence why I'm thinking it might be a slow/gradual process ? Link to comment Share on other sites More sharing options...
Thorin Posted December 10, 2007 Share Posted December 10, 2007 Hence why I'm thinking it might be a slow/gradual process ? It is. You can reset the ECU by pulling the two fuses and it'll learn quicker though. Link to comment Share on other sites More sharing options...
dangerous brain Posted December 10, 2007 Share Posted December 10, 2007 Super was 1.34 euro in Germany yesterday Link to comment Share on other sites More sharing options...
edge Posted December 10, 2007 Share Posted December 10, 2007 Its on five life now! Link to comment Share on other sites More sharing options...
adam bell Posted December 10, 2007 Share Posted December 10, 2007 Super was 1.34 euro in Germany yesterday whats that in old money Link to comment Share on other sites More sharing options...
adam bell Posted December 10, 2007 Share Posted December 10, 2007 was super unleaded around when the uk supras were introduced in the early ninetys Link to comment Share on other sites More sharing options...
CJ Posted December 10, 2007 Share Posted December 10, 2007 Super was 1.34 euro in Germany yesterday I pay 1.09 euro for normal unleaded out here. So, not crazy cheap Link to comment Share on other sites More sharing options...
dangerous brain Posted December 10, 2007 Share Posted December 10, 2007 Its 96 pence today according to XE.com Its 1.50 something at the garage on the corner in Holland, 1.40 something across the border in Belgium. To be fair I think that its not just the UK getting a hard ride its all of Europe. Link to comment Share on other sites More sharing options...
bodilx6 Posted December 11, 2007 Author Share Posted December 11, 2007 Ok, so we more or less established that higher RON does help (thoug no documentation), but how about thoes funky fuels with additives? Anyone has any experiences with those? Here in DK, shells V-Power is 97 octane but you can also get normal 98 octane. What would be best for the soop, and why? Link to comment Share on other sites More sharing options...
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