free hit
counters
Need Electronic Assistance - Lotus / Motoring / Cars Chat - The Lotus Forums #ForTheOwners Jump to content


Need Electronic Assistance


doct93

Recommended Posts

Hello all, I need assistance and I'm hoping one of you bright ladies or gents can help me. I've bought a MSD ignition controller (not for the Lotus, don't worry). The problem is, the only cheap one I could find is for an odd-spark V6, thus has only 10 degree spark duration, I want to fit this to a V8 and would like the normal 20 degrees duration.

MSD say they can convert it no problem for $35 - ideal! The snag is they're in Texas and I'm not! Now if they reckon $35, it must take about 15 mins to do, but they understandably won't tell me how to do it myself... My secret weapon however is that I have a circuit diagram (well a couple actually) and with an electronic genius's assistance think that I could easily swap the appropriate capacitor, resistor, diode or whatever.

All I need is that genius! Anyone able and willing? In return, I'll happily diagnose your psychiatric problems!

Tim B

Edited by doct93
Link to comment
Share on other sites


Upgrade today to remove Google ads and support TLF.
  • Replies 8
  • Created
  • Last Reply

Top Posters In This Topic

Surely this is Simon S4's territory?

"When I was a kid I used to pray every night for a new bicycle. Then I realised that the Lord doesn't work that way so I stole one and asked him to forgive me."

------------------------------

ribbon200.gifG-Car Owner and Proud! ribbon200.gif

Link to comment
Share on other sites

Sorry no idea really without a diagram, so

Put up a pic of the wiring diagram in question - can't be too hard.

Would love to have a look - might be an easy solution. :)

Simon  (94 S4)      My Esprit will be for sale in late 2017

Link to comment
Share on other sites

Sorry not much help here.

From the looks of it they can either be re-chipped, which would be a quick job for them or they can stick in a new resistor in (as you said). Putting a new resistor in would take longer as the circuit cards are humisealed (protective plastic covering- -takes a while to remove this stuff). There could also be a variable resistive pot on the cct card, which would make the job easier (for them) as long as you have the correct resistance to input. The other option I saw was switching. ie. there could be small micro switches on the cct card.

if there's no warranty stickers on the box I'd have a look inside and see what's there.

Simon  (94 S4)      My Esprit will be for sale in late 2017

Link to comment
Share on other sites

Right, it's all opened up - as you say, liberally coated in humiseal. No obvious switches or variable resistors in sight - any ideas based on the circuit diagram?

I've had a read of the patent (obsessive, me?) at http://www.freepatentsonline.com/4131100.html

and I think the key is the ratio of resistances between R16 and R17 on the timing circuit (on the first circuit diagram). Does this sound likely or look right?

Tim B

Edited by doct93
Link to comment
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.




×
×
  • Create New...