Ignition Thoughts/Ideas/Recommendations

[RICE RACING]

Originally Posted by NoDOHC

The toggle doesn't help me at all, as it still uses a common line to send out the ignition signal. This means my coils still get a drastically too-short charge time, even while being nowhere near to being saturated.

At 9,000 rpm, I get a maximum charge time of 2.8 ms (3.3 ms - 0.5ms discharge time). This will barely fire the engine.

Example of ignition signal:

3000 rpm
------------Leading -------------------Trailing--
___________|---------|___________|---------|

6000 rpm
--Leading ----Trailing--
_|---------|_|---------|

9000 rpm
-Leading-Trailing--Leading-Trailing
_|-----|_|-----|_|-----|_|-----|

Both the leading and trailing coil take a similar output from the ECU (just differing in the split angle), Thus the toggle signal is meaningless for the signal.

What I need is a "Smart" ignition system (that controls dwell independant of signal charge time). I can easily build a circuit that divides a signal to multiple ignitors based on the toggle output.

Forget inductive.

What you NEED is complete CDI system. Always running very high chamber pressure, with lots of fuel and water injected I have trialed every CDI offering on the market (or so it seems) also all the "hottest" inductive types, and many things in between from boosted primary to "Don Mega" coils snake oil and various guru's claims.

In the end CDI on a Wankel Engine wins hands down. You only need to follow Mazda to see this but some of us need to find out our selves too

If you want to know my recommendation feel free to PM me and I will gladly pass it on.

[TitaniumTT]

Originally Posted by RXTASY

Just bought 4 of these to run with my P1000 and E85.
http://http://www.diyautotune.com/ca...oil-p-394.html

Linky no worky...

Originally Posted by RICE RACING

I have run my own experiments comparing inductive to boosted inductive then to CDI based, as per a good Mazda test I found more power, lower EGT, leaner AFR (all indicating better more complete burn), on CDI than any version of inductive all other variables held constant. There is also a nice increase in RPM, again most cant test this on road/track.

Most who trash CDI or dismiss it have never run proper tests to back their views.

The best set up is COP, and CDI on all plugs, and wasted spark on leading

I did I did a back to back test of an M&W CDI system vs my inductive bosch coils. The CDI picked up 3hp but the idle blew donkeys... For the price savings of close to $1500, I'll stick with my inductive setup at this point. In the future when I start looking for north of 500 honest bhp with either an E85 or a water injected setup, then I think the CDI will hold merit. But at 400whp and below, especially n/a as NoDOHC is, the CDI just isn't worth the bread.... that's just my opinion.

I will say, and I do need to call C. Ludwig to tell him what happened with the QuickSilver coils that he rec'd, those are some stout fucking coils. Blow alot of things out of the water, LS1 included. The QuickSilvers added 4whp to my car when she was running pig ass nasty rich and getting ignition breakup AND they cleaned it up, lower egt's more hp, L was about the same but the breakup was gone. The ONLY drawback to the QuickSilver coils is their size but damn do they light it off. Thanks again to MC

Originally Posted by RICE RACING

Forget inductive.

What you NEED is complete CDI system. Always running very high chamber pressure, with lots of fuel and water injected I have trialed every CDI offering on the market (or so it seems) also all the "hottest" inductive types, and many things in between from boosted primary to "Don Mega" coils snake oil and various guru's claims.

In the end CDI on a Wankel Engine wins hands down. You only need to follow Mazda to see this but some of us need to find out our selves too

If you want to know my recommendation feel free to PM me and I will gladly pass it on.

Where he is, he doesn't NEED a CDI.... I would like to see what a CDI would pickup on an N/A car.... I would be surprised if it was more than 2rwhp. Don't forget Peter... not all of us are running the serious chamber pressures that you are... and water... last I checked water doesn't ignite very well... perhaps you should give bdc and hc a call and get a lesson in meth... after all... meth is a fuel

[RICE RACING]

Mazda factory did a test many many years ago on CDI v's inductive on NA at ~300bhp level, very good test showing even kV increased on inductive to match CDI and it could not match the power, it was less 12bhp from memory, I'll try to scan the report and the graphs and tests.

Mazda only recommend and have used CDI on all factory race NA's cars since about 1978, there is good reason for this.

For CDI to work as good as inductive at idle rpm it needs multi strike of the right frequency and number (also right amount of current and voltage, not all systems are the same in this regard if you measure them). FYI Even modern OEM inductive systems are multi striking at rpm's below 1500rpm, we have one in our workshop which I train my students on

CDI done badly will give you a bad experience, CDI done properly and you will never ever use inductive again, especially on a rotary engine