I f $350 will deal with the 7-9K power problem on a lot of cars ( like mine ) It will be a no brainer. I replaced all 4 coils and dyno'd about 8mos later and it didn't change a thing. To do a proper comparison though I would have needed new plugs at both dynos to rule them out.

A dyno with coilpack A new plugs...followed immediately by a dyno with coilpack B would let us see if it makes a difference.

Silver8...did you get any datalogs to compare dyno's to in car values...I wish that the data would show us something that explains how these engines are so different

 

Well, I never had the chance to run it under load - the MSD didn't have the option to set the spark event to occur at the trailing edge of the PCM ignition trigger, so the timing was way advanced.

This is very important, BTW. Many of the "plasma" or capacitive options trigger on the leading edge, which is not acceptable.

The AEM is switch-selectable for leading or trailing edge of the pulse.

The expectations are better fuel economy at cruise, smoother idle, faster throttle response and indestructable coils that provide more power at high RPM and, therefore, potentially more power over a wider range.

Here are the coils themselves:

 

there are better, less expensive alternatives, just PM'd you

 

Keep working guys ---please. I KNOW there are a lot of people out there with stressed or burnt coils. If $350-$400 would take care of that---you will have a a lot of peoples thanks. I beleive a good set of spark plug wires ought to be included with a upgrade like this. It may not make a good running car put out more on the dyno but it would sure fix a problem and make the car more bullet proof.
If coils and wires are a problem at this mileage then I would rather fix it right than band aid it again.
olddragger

 

MM you may want to read this thread... they seem critical of AEM stuff http://www.rx7club.com/showthread.ph...hlight=AEM+CDI

This thread seems to have some other ideas as well might be worth investigating http://ausrotary.dntinternet.com/for...7f095fea8f9485

e.g. this http://www.autronic.com/page_files/direct_fire_cdi.htm

 

Can you be more explicit -- what do you mean by less draw?

Isn't that what I said?

 

the spark energy doesn't just appear out of thin air, the coil draws it from the electrical system


sorry, my bad, I misread your comments.

 

Besides that being a really old thread (the C2DI is 3 revisions old since then), all of the failures were occuring on OEM coils.
Not a good idea.

TeamRX8's idea is a good one that we will experiment with as well.

There should be some good science on all of this by the end of March.

 

agreed, you beat me to it.

Spin, I intend to share once it's worthy to do so.

 

Understood, but do you have numbers for the draw (amps) for those alternative coils vs stock? What are the implications -- new wiring harness? Overloading the alternator? I just don't have a feel for the magnitude, or implications of using the Corvette coils. The price seems reasonable so if it were simply a matter of swapping the coils I'd be interested. I'm looking for details of why that wouldn't necessarily be a good idea, and also what would it take besides hooking them up to the original harness, fabricating a mount, etc ... Even fabricating some beefier wiring for the primaries doesn't sound too bad but again, I may not understand just how much current we're talking about so thought you might have a ballpark idea.

Also, is there such a thing as TOO MUCH spark energy -- i.e. frying the plug electrodes, arcing to ground, etc?

Thanks

 

We hope to provide those answers soon, but I do not expect there to be any need to rewireupgradethe factory harness. There will be a wiring interface required as well as mounting them because my preference is to get them in a bit more open and less heat intense area. The GM coils also require different sparkplug wires because they have a unique GM connector/boot. They are available as universal kits from the usual manufacturers

 

Good info all--thanks again--I wonder if RP is paying attention. This may be an easy needed upgrade for his system when it is ready.
OD

 

look what showed up on my doorstep, let the experiment begin







.

 

dang Team--I didn't know it was Christmas already!
Man keep us posted----what wires are those? MSD's?
olddragger

 

Gotta love V8's. Kit for 2 Rotaries :D

 

Can somebody help me out with the wiring diagram the the OE coil harness?

 

check pm

beers

 

BTW, the diagram would come from a separate RX-8 wiring manual. It's not in the general RX-8 service manual. I need to be able to decipher the OE coil wiring in order to fabricate a jumper harness between the RX-8 wiring harness and the new coils. They are not simple plug & play in that regard

 

Dang, my IOUAbeer tab is getting bigger and bigger that's great Spin

gotta thank my buddy swoope for his support too

now if I can only find a connector that duplicates the coil connection so that the harness doesn't have to be spliced

 

Bump for update as to how this is going?
Olddragger

 

Just the thread I was looking for ... I am looking into the hks twinfire ignition and was wondering about replacing coils (makes sense to me ), but I am not that confident about installing myself (coils)..The suspense..Great thread all!!

 

I haven't done anything yet between work, being iced in, and all around just too d-mn cold plus the whole host of other custom parts I'm trying pull together for my RX-8

I need either a coil wiring connector or a coil itself so I try to match the wiring harness connector. I want this to be plug & play with an adaptor harness. Unfortunately the RX-8 coil wiring is not on it's own smaller harness. I do not want to cut up the factory harness if I can help it.

 

Don't waste your $$$$ on the Twin Power. I have one and as I expected there was no measurable gain. I had seen the same thing happen on other n/a applications in the past but tried it anyway. Turbo rotaries like the twin power but it is a waste on the 8.

 

The issue isn't with what I bought, I have the adaptor harness for that side of the system.

The issue is coming up with an electrical connector that duplicates the OE Mazda coil connection that I can splice into the replacement coil adaptor harness. Once I can acquire those connectors the electrical system will be plug & play because I'll be able to plug the adaptor harness into the RX-8 engine harness in place of the coils. Then it's just a matter of physically mounting the coils. Unfortunately that coinnector is integral to the coil body, so I can't just cut & splice it. I have to find a duplicate connection that can be spliced into the harness.

So close yet so far ...

 

sorry, that information will not assist me with what I need

here is the OE coil setup:




I want to be able to unplug the four OE coils and plug the new adapter harness into their connectors. The adaptor harness is already connected to the four replacement coils with the proper OE connectors

so it's the connector on the RX-8 coil that I need to duplicate for the adaptor harness, shown below:




BTW, I discovered that I already had all those electrical diagrams, I should spend less time collecting and more time reading through what I have, LOL


.