CDI Ignition systems

[Amaru]

I currently have an R32 GTR with moderate mods including exhaust, airfilters, z32 airflow meters, apexi power fc, apexi avc-r, hks gt2530 turbos, rebuilt engine with forged internals and extensive head porting job.

The car was tuned last night, and its running good (no more puffs of white smoke as you come onto boost), but the tuner mentioned the ignition system could use an upgrade and reccomended moving to a CDI style ignition system.

Now im not totally familiar with this area of cars, so what are peoples input on this? Is the Splitfire system I always see for sale for $1000+ a CDI system, and would it work OK?

Any help/advice/input would be most appreciated, thanks.

[B-Man]

AFAIK - the Splitfire system is just coil packs - not full on CDI.

For full on CDI, I think you need to go something like MOTEC or AUTRONIC

See here:

http://www.autronic.com/cdi.html

[Leewah]

As far as I know, Splitfire coils do help produce a larger spark than stock coils however it is not a CDI.

A CDI (Capacitor Discharge Ignition) is an add-on box which amplifys the charge of the spark during combustion.

I have an Autronic CDI in my car as the ECU is also an Autronic. HKS have the Twin Power Ignition Amplifier, Motec also has it's own CDI.

CDIs usually retail for around the $1000-$1500 mark depending on the brand and the size of the charge it can produce.

[RBVS]

yea i have autronic cdi. it boosts the coils in a way and gives a bigger spark at your plugs. I herd most people use when running larg boost to help spark.

i was lucky to get mine second hand $750

[Amaru]

Thanks for the input Ive been looking at the HKS unit, anyone use this?

And how much do the Autronic ones go for, and who sells them? I was going to use this money for intercooler/camshafts but seems this wont be happening

[Sydneykid]

Hi Amaru, we use the standard coils up to 650 bhp (400 rwkw), no problems, with plug gaps at 0.8 mm. For over 700 bhp we use the Motec CDI unit with Mercury Outboard coils as they are designed to be used with CDI.

BTW, CDI is not an amplifier of the spark, it provides a multiple firing of the coil for each ignition, not one, single, long spark as is standard (non CDI). Consequently you need a coil that is specifically designed to be fired in multiples, very rapidly.

So CDI with standard coils is pretty much a waste of money and if you are under 650 bhp I wouldn't worry about changing from the standard setup anyway, provided it is in good condition of course.

Hope that helps

[RBVS]

what coils work with multi spark for rb25's??

(when doing my conversion i just jumped head first, and went with what the work shop did.)

i think back i could prob do it harf price to what i paid ,well live and learn, i do everything i can my self now.

sorry just that i forgot i even had cdi!!!