Esprit V8 Coil on Plug conversion. - LotusTalk - The Lotus Cars Community

 
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post #1 of 10 (permalink) Old 08-16-2009, 12:01 PM Thread Starter
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Esprit V8 Coil on Plug conversion.

Figured some here might be interested in this-- I got sick of the silly coil setup on the Esprit. The coils often get cooked and have corrosion/grounding issues given their position between the banks, and the plug wires are of a pretty questionable quality and hard to come by, so I decided to go the road less travelled and move to a COP setup.

So far, my testing has been very positive. Idle is much smoother, fires on the first crank, zero high-RPM miss, and if a coil ever goes out it's a five minute fix versus two days. Also, the benefits of a CDI ignition and a full spark at high RPM.

I may be inclined to produce a small run of these if anyone's interested. Though, they would not be especially cheap given the components involved (M&W box, mil-spec silver plated wire, etc)
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post #2 of 10 (permalink) Old 08-16-2009, 01:50 PM
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nice job!

Travis
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post #3 of 10 (permalink) Old 08-16-2009, 05:37 PM
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Nice, always good when something likes this comes together and works better than stock.

I got rid of my distributer and put crank fire in my 1972 BMW 2002...world of difference,

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post #4 of 10 (permalink) Old 08-17-2009, 06:14 PM
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Very nice mod!

Jim
1995 S4s
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post #5 of 10 (permalink) Old 08-19-2009, 09:53 PM
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Is there a conversion like this for the Chargecooler 4 cylinder in my 1993 Esprit?

Rory S. Brown
1993.5 Lotus Esprit
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post #6 of 10 (permalink) Old 08-20-2009, 07:32 AM Thread Starter
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Quote:
Originally Posted by Rorysbrown View Post
Is there a conversion like this for the Chargecooler 4 cylinder in my 1993 Esprit?
I don't have a 4-pot Esprit any longer, so I'd have to take some measurements from one for the wire harness, but so long as it's a distributorless car, it'll work.
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post #7 of 10 (permalink) Old 08-20-2009, 08:01 AM
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Quote:
Originally Posted by Simba View Post
I don't have a 4-pot Esprit any longer, so I'd have to take some measurements from one for the wire harness, but so long as it's a distributorless car, it'll work.
It is distributorless so I would like to find out how much it would cost.

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1993.5 Lotus Esprit
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post #8 of 10 (permalink) Old 11-05-2010, 04:42 PM
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Quote:
Originally Posted by Rorysbrown View Post
Is there a conversion like this for the Chargecooler 4 cylinder in my 1993 Esprit?
u can run the arc-2 dynatec unit + denso ir plugs
with used cbr coils for around $400 usd

189+mj it will fire even water lol
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post #9 of 10 (permalink) Old 11-05-2010, 08:15 PM
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What coils are those? I've seen a few home-made COP setups using Chrysler 300M coils, those look more compact. I know there was talk of capacitance and dwell time, not sure how these fit in relation to the factory ECU requirements, obviously, they must work well. Nice work!
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post #10 of 10 (permalink) Old 11-07-2010, 06:05 PM Thread Starter
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Originally Posted by shill68 View Post
What coils are those?
They're reworked Denso coils produced by AEM-- essentially modified "dumb" 2-wire bike coils adapted to work with conventional plugs. They're run by the CDI which makes all the magic happen.
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