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You're probably right about a few things here.... cold start for example. Is no need for cold start adjustment with LPG cos it vapourises at such a low temperature anyway unlike petrol that even with an injection system needs to take heat from the engine to allow it to mix with the air. So adjustment is necessary when the engine is cold and the fuel isn't vapourising. Leaving the air flow meter connected is ok cos that was necessary with the rover 827 but again it was compromised cos it was set up for burning petrol and adjusted the ignition accordingly. You're also right about the ignition curve. Was on a site and it showed this in graph form with RPM plotted against timing advance/retard and if you weren't using petrol you would get better performance/mpg adopting the LPG curve rather than, as they were suggesting, following the line they had drawn through the middle of both (the compromise).
Really what I need is a simple aftermarket system that is compatible with the engines dizzy fitted crank angle sensor and mappable too.
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'71 Arrocuda.... '71 Sunbeam Rapier Turbo (The Grim Rapier).... '63 Hymek D7076..... Audi GT5S
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30psi
Posted a lot
Posts: 1,024
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Vems did a 36-1 disc for the DET crank angle sensor, knowing Nissan it would be the same fitment as the one in the ET dizzy, then you could use megaspark or something.
The other you could investigate is trying out a mech/vacuum adv dizzy from a 1.6 carb bluebird. It fits differently though rather than being at the side of the head next to no.1 it slots online with the cam behind no.4. If you had enough firewall clearance I reckon you could use this (find out if there are differences with the bluebird ET cam as the dizzy slots in to it but may not in the S12 cam. Other option is down to how good you are at hacking and fabricating but you could look at using 1.6 mech dizzy guts etc in the s12 dizzy case
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1962 Ford Thunderbird 6.4L
1981 Datsun Bluebird SSS CA18DET
1981 Datsun Bluebird SSS SR20DE
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Nov 26, 2009 23:41:26 GMT
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Been doing a little googleing and I've come across an ignition module that allows you to program in any mapped ignition curve you want and stores it in it's memory. It uses only the crank sensor (hall effect or reluctor types) and the air flow meter signal and advances/retards the ignition according to the parameters given on your pre-programmed map. Only comes in kit form so I'd have to get the soldering iron out but if it is what I'm reading it would be ideal. Will get back to you with more after I've spoken to someone.
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'71 Arrocuda.... '71 Sunbeam Rapier Turbo (The Grim Rapier).... '63 Hymek D7076..... Audi GT5S
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