Alex Posted August 1, 2001 Share Posted August 1, 2001 I've got a friend to agree to looking at my ignition timing to make sure its running ok on SUL instead of 102octane. Can someone please let me know what sort of timing figures I should be looking for. If its mapped to 102 octane how much should the ignition be retarded by? Cheers Quote Link to comment Share on other sites More sharing options...
Guest Martin F Posted August 1, 2001 Share Posted August 1, 2001 Alex Take a look at http://www.mkiv.com/manual/manualtt/ignition_timing_inspection/iti3.jpg Unfortunately if the timing is off on the MKIV doesn't seem to be a lot you can do about it. Quote Link to comment Share on other sites More sharing options...
Alex Posted August 1, 2001 Author Share Posted August 1, 2001 Oh goody I figured that I could adjust the timing to better suit SUL. Maybe I'm thinking of valve timing? Is there an adjustmant to be made in any other area such as the cams which will affect the timing of the spark etc? and reduce the risk of running lean.... Quote Link to comment Share on other sites More sharing options...
Digsy Posted August 1, 2001 Share Posted August 1, 2001 Alex, I was talking to our ECU calibration guys yesterday. No-one there is aware of anything that says Japanese cars are mapped for anything higher than 95RON. You shouldn't be running lean on SUL (98RON) (if that is what you are worried about). Darren Quote Link to comment Share on other sites More sharing options...
Doughie Posted August 1, 2001 Share Posted August 1, 2001 Hmm. All the info i've read over the past year indicates that the Jap-spec cars were mapped to at leat 100RON and maybe 102RON. The ignition timing on Jap-spec cars is advanced (in the timing sense) in comparison to UK cars. i.e. UK-cars timing is, as stock, retarded to run on lower octane fuel than Jap cars. Chris Wilson has confirmed this to be the case, and is one of the main reasons why the Jap-spec cars are more torquey than the UK cars (though there are multiple other differences which also have an effect too) Quote Link to comment Share on other sites More sharing options...
Alex Posted August 1, 2001 Author Share Posted August 1, 2001 Don't forget I've got the aftermarket MINES replacement ECU which is likely to be for racing. i.e. high octane Quote Link to comment Share on other sites More sharing options...
Digsy Posted August 1, 2001 Share Posted August 1, 2001 I've read this too, but I think it was in the "myths" section on one of the many importer's websites. My information comes (in part) from the worldwide Emissions regulations booklet published by Delphi systems. I hasten to add that ECU mapping is well away from my area of expertise, but there are plenty of people I can go and talk to about it. To further qualify the case for 95RON, we have a job on right now that will sell into Japan, and that is definitely being calibrated for 95RON. Maybe its different for home-grown cars. Perhaps they have a greater range at the pumps than we do. I can't say for sure. It also may have been different in the past since we are generally talking about 1993 to 1996 cars when we talk about imports. Its certainly 95RON now, to the best of my knowledge. Alex, I was picking up on your other thread where you were talking about going back to a stock ECU. If you are keeping the MINES job, then you could well be right. Darren (Edited by Darren Blake at 4:37 pm on Aug. 1, 2001) Quote Link to comment Share on other sites More sharing options...
Alex Posted August 1, 2001 Author Share Posted August 1, 2001 Why don't you just admit who you work for.... you'll only get ribbed for it once.... hey I'm an ex-employee too. I have to carry the burden of having worked there! And the other half is still there! Quote Link to comment Share on other sites More sharing options...
Digsy Posted August 1, 2001 Share Posted August 1, 2001 Nooooooooooo!! You'll never make me talk...! Oh OK, OK. I design engine parts for Lotus Engineering. There. I've said it. Lordy, now who's going to believe anything I say? ;-) Darren Quote Link to comment Share on other sites More sharing options...
Paul Booth Posted August 1, 2001 Share Posted August 1, 2001 Isn't that Proton Sports? Quote Link to comment Share on other sites More sharing options...
Alex Posted August 2, 2001 Author Share Posted August 2, 2001 Paul - PUT THE CLAWS AWAY! ME-OW! ;) Quote Link to comment Share on other sites More sharing options...
Alex Posted August 2, 2001 Author Share Posted August 2, 2001 As for the timing issue don't worry I've now managed to get it through my thick head that I have to adjust the ECU to change the timing. I was thinking that there was a mechanincal way to change it... DOH... don't think I'll ever manage to be an engineer!! Quote Link to comment Share on other sites More sharing options...
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