garrycol Posted December 16, 2018 Share Posted December 16, 2018 I am putting in a Thor 4.6 into my 101. ECUs are an issue so I am thinking of putting a distributor onto the front of the engine but would like to keep the Thor inlet system - the easiest ECU to use would be a 4CUIX as they are cheap and readily available and can be remapped to provide the extra fuel for the 4.6 over a 3.9. Now I am not all that familiar with the 4CUIX but one I believe sensor inputs are similar to the Thor Motronic system. One difference is the PWM valve on the Thor to provide air to the engine at idle - I believe the 4CUIX has some sort of stepper motor system to provide a similar function - so will the 4CUIX be able to control the Thor PWM or would I need to rig up a 4CUIX system on the Thor. Are there any other complications I may have missed? Also does the 4CUIX support knock sensors? Thanks Garry Quote Link to comment Share on other sites More sharing options...
Carloz Posted December 16, 2018 Share Posted December 16, 2018 I guess you mean the 14CUX ecu? I don't think it can drive an PWM valve. Stepper control is completely different electronic idle control. PWM (2wire) needs as a rule of thumb an higher current than steppermotor (4wire). Best is to use a steppermotor on the THOR manifold or change the whole manifold. Also no nock sensor inputs available. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 17, 2018 Author Share Posted December 17, 2018 Great - thanks for that information - confirms what I had in the back of my mind. Cheers Garry Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 17, 2018 Share Posted December 17, 2018 Megasquirt? 2 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted December 17, 2018 Share Posted December 17, 2018 4 hours ago, FridgeFreezer said: Megasquirt. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 17, 2018 Author Share Posted December 17, 2018 (edited) Is too hard with no real support outside the UK/US - looking at other options. I would like to keep this discussion on the 4CUX running a idle air valve on a Thor manifold and not a discussion on the pros and cons of Megasquirt. Edited December 17, 2018 by garrycol Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 17, 2018 Author Share Posted December 17, 2018 Is the 4CUX idle valve a autonomous part like the Thor PWM or is it built into the manifold? Quote Link to comment Share on other sites More sharing options...
elbekko Posted December 18, 2018 Share Posted December 18, 2018 Won't you have issues with crank length and the oil pump if you swap to a front cover with a distributor? 1 Quote Link to comment Share on other sites More sharing options...
Bowie69 Posted December 18, 2018 Share Posted December 18, 2018 Yep... Once you start mucking about like that you are in a world of pain, much more so than building a MS installation. 😛 The regular hotwire idle stepper is fitted to the back of the plenum, and is self contained, but I reckon you will struggle to physically mount it to a Thor manifold. Quote Link to comment Share on other sites More sharing options...
zardos Posted December 18, 2018 Share Posted December 18, 2018 As an alternative, Not Megasquirt but also not 14CUX but there are commercial alternative ECU's that can drive distributor less engines that have suppliers and support in Australia. e.ghttps://www.linkecu.com https://www.haltech.com/ Quote Link to comment Share on other sites More sharing options...
FridgeFreezer Posted December 18, 2018 Share Posted December 18, 2018 2 hours ago, elbekko said: Won't you have issues with crank length and the oil pump if you swap to a front cover with a distributor? Also camshaft length to drive the dizzy. Quote Link to comment Share on other sites More sharing options...
Quagmire Posted December 18, 2018 Share Posted December 18, 2018 14cux valve is a standalone part and similar valves were used in many other applications, Saab's, Volvo's, Porsches etc. I seem to recall there are some versions with slightly different inlet/outlet pipe configurations which could be handy. Edit- Google Bosch 0 280 140 501 and you'll get one with the ports in line with each other rather than at 90 degrees as an example. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 18, 2018 Author Share Posted December 18, 2018 5 hours ago, elbekko said: Won't you have issues with crank length and the oil pump if you swap to a front cover with a distributor? You just use a spacer on the crank - you use a cam with the dizzy drive and the oil pump is in the timing cover being driven by the cam. All standard stuff. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 18, 2018 Author Share Posted December 18, 2018 5 hours ago, Bowie69 said: The regular hotwire idle stepper is fitted to the back of the plenum, and is self contained, but I reckon you will struggle to physically mount it to a Thor manifold. Thanks - I will get a hotwire idle stepper from a wrecker and check it out. The Thor PWM is self contained and remote from the intake and simply unbolts so there should be space for the idle stepper but will find out when I get one. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 18, 2018 Author Share Posted December 18, 2018 4 hours ago, zardos said: As an alternative, Not Megasquirt but also not 14CUX but there are commercial alternative ECU's that can drive distributor less engines that have suppliers and support in Australia. e.ghttps://www.linkecu.com https://www.haltech.com/ Thanks already looked at them - hellishly expensive here where the 14CUX is cheap and can be locally upgraded. Quote Link to comment Share on other sites More sharing options...
garrycol Posted December 18, 2018 Author Share Posted December 18, 2018 3 hours ago, Quagmire said: 14cux valve is a standalone part and similar valves were used in many other applications, Saab's, Volvo's, Porsches etc. I seem to recall there are some versions with slightly different inlet/outlet pipe configurations which could be handy. Edit- Google Bosch 0 280 140 501 and you'll get one with the ports in line with each other rather than at 90 degrees as an example. Thanks for that - very helpful Quote Link to comment Share on other sites More sharing options...
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