BrendanD Posted December 12, 2013 Share Posted December 12, 2013 Hi,I've just got a Lucas 25D6- based 123-tune conversion for my GT6 A simple question and a harder one.1. What cap would be required? Caps seem to be sold by model so this is confusing.....2. Has anyone set up a Mk3 GT6 with the 123 Tune and what advance curve settings did you use? Alternatively, what are the stock advance curve settings for a late 73 Uk spec Mk3?Its my Christmas task!Many thanks!Brendan Quote Link to comment Share on other sites More sharing options...
BrendanD Posted December 14, 2013 Author Share Posted December 14, 2013 Cap sorted, but any thoughts on the advance curve? Quote Link to comment Share on other sites More sharing options...
rotoflex Posted December 14, 2013 Share Posted December 14, 2013 You may be the first here with a 123 in a GT6! Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted December 14, 2013 Share Posted December 14, 2013 Is this the fully mappable version?If so, there was a recent thread on this for another 6 pot Triumph. Also, maps used on Megajolt and Megasquirt systems will have some relevance.My starting point was to plot the mechanical and vacuum advance from the standard distributor. If the engine is standard them this will likely turn out to be pretty much spot on for full throttle line (the Triumph engineers did know what they were doing) but you'll be able to improve on the part throttle settings.Nick Quote Link to comment Share on other sites More sharing options...
BrendanD Posted December 14, 2013 Author Share Posted December 14, 2013 Hi Nick,Yes its the mappable version as I read the previous thread. I've also had my spare rev counter 'modded' by JDO. I'll dig out the workshop manual and look up the standard advance curve. Quote Link to comment Share on other sites More sharing options...
BrendanD Posted December 14, 2013 Author Share Posted December 14, 2013 Hi i've been through the workshop manual and I can't find any settings for the advance curve, just the static and idle settings....Any one know these? Quote Link to comment Share on other sites More sharing options...
rotoflex Posted December 15, 2013 Share Posted December 15, 2013 Does this help?http://www.teglerizer.com/mgstuff/advance_curves.htm Quote Link to comment Share on other sites More sharing options...
piman Posted December 15, 2013 Share Posted December 15, 2013 Hello Nick, I know I've asked before but don't remember a sensible answer, how do you map it to mimic the vacuum advance timing, without other sensor inputs?Alec Quote Link to comment Share on other sites More sharing options...
BrendanD Posted December 15, 2013 Author Share Posted December 15, 2013 rotoflex wrote:Does this help?http://www.teglerizer.com/mgstuff/advance_curves.htmThanks Bill.70-73 GT6 Mk3 is the only one with missing data. Will have to map it as a Mk2.... Quote Link to comment Share on other sites More sharing options...
HMaze Posted December 15, 2013 Share Posted December 15, 2013 MK3 to Engine no KE10000Distr. Delco Remy D200 795 3681centrifugal adv.rpm- deg (both crank) 400- 01600- 7-112400-14-183200-16-214400-20-24 maxVacuum adv.InHg-deg (crank)2-0°4-0°-4°8-6°-10°13-14°-18°20-14°-18°from engine no KE10001 ondistr. Delco Remy D204 799 2127centrifugal advrpm-deg (both crank)800-01200-0.8-4.82000-12-163000-14-184000-16-205000-18-225600-22vacuum advinHg-deg (crank)3-0°5-1°-5°7-7°-11°8-10°-14°20-14°Cheers,Harry Quote Link to comment Share on other sites More sharing options...
Nick Jones Posted December 15, 2013 Share Posted December 15, 2013 piman wrote:Hello Nick, I know I've asked before but don't remember a sensible answer, how do you map it to mimic the vacuum advance timing, without other sensor inputs?AlecYou do have another sensor input - a vacuum sensor, which is used measure engine load and thus give the "third dimension" to the ignition map.One point about this, which is hopefully covered in the 123Tune manual, is that this does need to be a true manifold vacuum reading for best results and this may not be what you get from the original vac-advance connection, which are sometimes taken from within the arc of the throttle butterfly.Not sure about MJL, but on the more advanced versions of Megasquirt you can also use coolant temperature and inlet air temperature to tweak timing settings (eg I have slightly retarded ignition when inlet air temperatures are high to reduce pinking) but this isn't really necessary - just allows you to push a bit closer to the edge for ideal conditions without running into problems when conditions are much worse.CheersNick Quote Link to comment Share on other sites More sharing options...
BrendanD Posted December 15, 2013 Author Share Posted December 15, 2013 2250 wrote:MK3 to Engine no KE10000Distr. Delco Remy D200 795 3681Cheers,HarryFantastic! thanks so muchBrendan Quote Link to comment Share on other sites More sharing options...
piman Posted December 16, 2013 Share Posted December 16, 2013 Hello Nick, that clears it up, thank you.Alec Quote Link to comment Share on other sites More sharing options...
Bainzy Posted December 16, 2013 Share Posted December 16, 2013 Nick_Jones wrote:Not sure about MJL, but on the more advanced versions of Megasquirt you can also use coolant temperature and inlet air temperature to tweak timing settings (eg I have slightly retarded ignition when inlet air temperatures are high to reduce pinking) but this isn't really necessary - just allows you to push a bit closer to the edge for ideal conditions without running into problems when conditions are much worse.You can only have one extra input on Megajolt (so you'd have to choose between coolant temp or inlet temp advance/retard), and loooads of extra inputs on the latest Megasquirt (probably more than you'd ever use even if you were preparing the engine in a lab). Quote Link to comment Share on other sites More sharing options...
.thumb.jpeg.b15b81ef10abeea1c3039ae03c4a9f3a.jpeg)
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.