Ignition on a 13B

[Grant Monkhouse]

Just so your aware the ls3 truck coils are £45 each

I noticed, found some earlier on quick eBay search.:Thumbsup!:Thumbsup!

[Prof]

I was thinking of building my own for the FC.
 
The stock coils are pretty good - they are ideal for IGBT driven circuits, and can easily pack quite a bit more punch when driven with these devices.  Driving them via a high speed micro will also permit the possibility of multispark at low rpm\'s and a higher pulse single spark at high rpms.
 
I still haven\'t figured out exactly what the twinspark does - the way it\'s wired in, it must be wave shaping the signal to improve charge time / energy stored, and the shutoff spike is obviously narrowed producing a higher voltage.
 
As I say with modern semiconductors it should be possible to make a good igniter.

[Grant Monkhouse]

I just searched and found this,

http://www.smbaker.com/sand-rail/mazda-rotary-conversion/msd-6a-direct-fire-ignition-for-mazda-rx-7-rotary-engine

MSD setup, really good description on how to modify everything.

However the MSD unit alone is £350.

[TRIND-FD]

@ blitz, a friend runs 2x twin power units with great effect. Very good times.
Just throwing it there for grant, if he wants the info I will point him to the person who will tell him.

Keith.

[BlitzBoy]

For 450 rear wheel a good stock FD system with a Twin power with good wiring, maybe direct feed to the ignitor via relay will make sure you good the full voltage is all you need

No sense complicating something by using different coils etc etc for this power level, the stock FD system only seems to go marginal at around 500rwhp

[Grant Monkhouse]

@ blitz, a friend runs 2x twin power units with great effect. Very good times.
Just throwing it there for grant, if he wants the info I will point him to the person who will tell him.

Keith.

Cheers, I want all the info I can get so i can build the best system possible that will work well for what I want now and for when I want more later.

[Prof]

Doesn\'t the increased boost and WI tend to \'quench\' the spark?

[BlitzBoy]

@ blitz, a friend runs 2x twin power units with great effect. Very good times.
Just throwing it there for grant, if he wants the info I will point him to the person who will tell him.

Keith.

again why?? makes no sense,there is no benefit from wiring two in, from knowing what the twin power does, what power is he at, what times does he run?

The stock FD system runs one Leading coil which does both rotors, and two trailing, one ignitor.
If you ran an ECU which allows you to run 4 coils, you would not use the specific Rotary Twin spark, which has three outputs, one for the leading coil and two for the trailing. You would use the DLI version which has up to 6  outputs. So Trini your friend could have saved some money and just wired in the DLI version instead of buying two rotary Twin sparks.

Anyway what the f**k do I know, I only map the things, apparently internet tuners know more, so I bow to everyones knowledge on this thread lol :cheers

[Grant Monkhouse]

For 450 rear wheel a good stock FD system with a Twin power with good wiring, maybe direct feed to the ignitor via relay will make sure you good the full voltage is all you need

No sense complicating something by using different coils etc etc for this power level, the stock FD system only seems to go marginal at around 500rwhp

Cheers blitz. Will possibly stick with what your suggesting for now and make the hks as good as it can be to a point.

I find it strange there isn\'t a sticky section on ignition defile as I would have thought this as a subject was vitally important to maintaining good health on a high powered rotary?

[TRIND-FD]

Like I said, it\'s not me. So I can\'t tell you. I don\'t pretend to know everything.
The chap is well know by you and others, so grant can speak with him. If he is running like that there must be a reason. Perhaps they are in parallel ,
God knows. .

Keith

[Grant Monkhouse]

Doesn\'t the increased boost and WI tend to \'quench\' the spark?

That\'s what I would say. You actually need a higher voltage to ignite the mixture, as the water boost and fuel would overwhelm a weak spark

[BlitzBoy]

Doesn\'t the increased boost and WI tend to \'quench\' the spark?

yes correct if you go above a certain power I see this, but really an upgraded ignition system even with WI only seems to be needed over a certain power, and in my view that tends to happen around 500rwhp

[Grant Monkhouse]

Like I said, it\'s not me. So I can\'t tell you. I don\'t pretend to know everything.
The chap is well know by you and others, so grant can speak with him. If he is running like that there must be a reason. Perhaps they are in parallel ,
God knows. .

Keith

I was just trying to figure how they would be wired together and in parallel would be the obvious way, in essence you would be compounding the effect of the twinpower providing that feeding voltage to thesystem doesn\'t drop, or the amps of the circuit increasing causing the resistance to increaseand voltage dropping and the likelihood of a fuse blowing.

Hmm thinking out loud.......

[BlitzBoy]

Now I run Motec as I plan to go over this 500rwhp I use four coils, two Bosch coils for the leading and two stock for the trailing. James Wilday runs the same ecu as me and run 4 bosch coils and that was good for over 550 rwhp as you can see in his 140 terminals from last year

[BlitzBoy]

The chap is well know by you and others, so grant can speak with him.

Whats his name or is it a secret lol:evillaugh