dpepper Posted February 12, 2003 Share Posted February 12, 2003 Hi all, I've just done a search on this topic, and spent ages reading the endless threads, which was a good read. However, Im still not sure what type of fuel is best for my standard 94 j-spec TT auto? There are not too many sul outlets near me, but if it was THAT important, i could get to one. I understand that the sul WILL probably improve performance, but that aside, what does my supe NEED,does regular ul cause probs in the long run, or is it ok ? Cheers Quote Link to comment Share on other sites More sharing options...
THOR Racing Posted February 12, 2003 Share Posted February 12, 2003 I would say for a completely standard Supra that normal unleaded is fine. I won't say you'll be getting the best performance out of it but it won't damage it in my opinion. BUT... isn't that why you brought a Supra I found it a false economy when my Supra was standard. With Super it went further than on normal UL so the extra cost of the Supra was easily justfiable. But if you cannot get Super then normal is fine on a standard Supra as it has enough learning ability to retard the igntion to reduce any knock associated with the poor fuel. Regards Pete Quote Link to comment Share on other sites More sharing options...
Nathan Posted February 12, 2003 Share Posted February 12, 2003 I agree with all of Petes comments. Anything other than a bog stock Supra should be on SUL though. Even one with breathing aids such as aftermarket exhausts/decats etc. For sure, those that can afford an exhaust etc can sure as hell afford to put SUL in it anyway! I take your point about location to a SUL outlet though.....but look at it this way....it gives you a chance to drive the car!! I'm not saying I was as sad as to drive 5 miles to a SUL outlet in a town centre when I had another SUL oulet around the corner down a backstreet or anything.... Cheers, Nathan TDI PLC Quote Link to comment Share on other sites More sharing options...
dpepper Posted February 12, 2003 Author Share Posted February 12, 2003 cheers Nathan and Pete for the reply, like everyone i guess, I have plans for the supe, but in the meanwhile, I didnt want to do any damage (esp as i av low mileage) - thanks again for your advice. cheers guys ! Quote Link to comment Share on other sites More sharing options...
dpepper Posted February 12, 2003 Author Share Posted February 12, 2003 Also, Pete, from what i read from posts, if i decide to put sul in, and see how it feels, i need to reset the ECU yeahie by removing the fuse, that is, it not just a case of putting the fuel in? Quote Link to comment Share on other sites More sharing options...
THOR Racing Posted February 13, 2003 Share Posted February 13, 2003 i need to reset the ECU yeahie by removing the fuse, that is, it not just a case of putting the fuel in? No not strictly true. Just changing the fuel will be O.K. but the amount of retardation in the ignition timing system added in, due to the low RON normal uneaded, will take a finite time to be removed back to a figure most suitable to the Super Unleaded. The car will sample the Knock detectors and after a while will advance the ignition a little. If the engine detects no knock then it advances some more, and so on and so on. This obviously takes some time. Now the alternative is to remove power to the ECU for a short while. The ECU forgets the retarded ignition setting and must restart from the default programmed in from Toyota. This for the Jap cars assumes 100RON I guess. So this time it' likely that the car feels more responsive as you've suddenly removed all retardation and possiby advanced the ignition system beyond what even Super Unleaded can cope with. So again the knock detector detects knock and retards the ignition again. But this time only a tiny amount,well less than for normal unleaded. So people remove the EFI fuse as it gets you a quick fix to the problem of the ECU relearning. It also feels better as the ignition advance changes a lot compared to the setting just before the fuse was pulled, probably hightened by the fact the ignition is too advanced anyway (just a guess that one). So if it's raining and you change to SUL, have a long cruise ahead of you then in about 50->100 miles it will have adaped anyway and you don't get wet. But if it's fine and you want instant "whamo!" then remove the fuse for a bit. Regards Pete Quote Link to comment Share on other sites More sharing options...
Terminator Posted February 13, 2003 Share Posted February 13, 2003 A good post Pete. I knew roughly how it worked, but have a better understanding now, thanks. Quote Link to comment Share on other sites More sharing options...
dpepper Posted February 13, 2003 Author Share Posted February 13, 2003 yeah, thanks again for explaining it so well Pete. Quote Link to comment Share on other sites More sharing options...
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