Big Power Mods.

Stock J-spec block
BNR3
ID 1000x2, ID 2200x2
Aeromotive 340 stealth intank.
Haltech e6x on factory coils.

Plan on using e85, but was I was told I would need ignition boxes.

I Need to know because car will be taken across the state for a tune and i need it to be ready or really close to completely ready.

 

HK$ twin power on stock FC ignition is pretty powerful. I'd give that a shot. Just the stock coils alone probably won't cut it. On my old setup for my personal FC I had a T04S, which has the same compressor wheel as the FC BNR stage 3 turbo, and about 12psi was the max I could go without getting misfire. This was on pump 93 octane. Now maybe I just had a weak leading coil, but if you are concerned about running into problems during a tuning session I would not go without an ignition amplifier. Since I switched to HKS Twin Power I have run 21psi on that T04S turbo with race fuel and 18psi on a larger T04R turbo (67mm inducer compressor) with pump fuel.

The nice thing about the Twin Power is that it amplifies both leading and trailing, plus it is only a few wires to install and doesn't take up much space. It's pretty hard to screw up the installation and it's reversible.

 

Thanks. Ill keep the twin power in mind.
I like that it is a simple install with minimal wires.

 

A lot of variables to contend with. Normally I would say no, however, Sleeper7 is running 30 psi on E85 and netting around 117 mph in the 1/8th on a set of stock coils. He's using four trailing coils and four ignitors, running them in direct-fire/sequential mode.

A sure fire solution would be a set of Mercury Marine coils. Their high output at relatively low charge times are perfect for wastespark use with the E6X ECU.

 

As ludwig mentioned a lot of variables, but in my personal experience no.

I have run two turbos with e85. A t70 I was running at 16psi and made 401whp. I ran the same turbo up to 20psi. Ignition never broke up AFR about 11.5 on petrol scale. Second turbo is a to4b, I run 20psi daily, 11.5 afr on petrol scale no breakup.

On both setups it would break up if I went richer than 10.5 afr (petrol scale), but it is easy to avoid.

More details on my setup:
e6x
stock coils
3.5ms dwell time
1200/1600cc injectors twin walbros
stock 6 port.

Hope that helps.

 

Ok.. Sounds like i need to try the factory coils.

SOme bur10eq's be good for this?

 

double

 

There are many combinations that you could try. You just have to realize how ignition system works and recognize weakness of stock system. In my opinion its waste spark system on leading side. Just think about it, 4-stroke engine in wastespark mode will fire once per rev, rotary in wastespark will fire twice per rev, 4-stroke in full sequential will fire once per two revolutions, rotary once per one revolution. My point is that just from design standpoint, you´re starting with very short time to saturate and discharge coils, especially at high revs. If your ECU allows, go with full sequential or with Mercury coils as been suggested. Best if you do both

 

Thank you. I have already decided if i do need more ignition i would go with anther set of trailing coils. Easy for my to find and cheap. N/a and turbo trailing are identical, correct?

 

I ran stock coils with an M&W box(waste spark)..worked till around 550hp. I wouldn't suggest since its kind of a ticking time bomb on waste spark.

 

+1. well said too

 

+ 2

 

Mazda's wastespark is typical 80s and 90s. It's more than enough for what Mazda designed it for, and very few individual coil systems were in use at the time. The big thing about switching to four individual coils firing independently is that you have to make sure all your wiring, dwell times, etc are done right.

all the s4 ignition coils are the same across models. I thought it was funny when I gave my friend with an FD a leading coil off an s4 base model that had been sitting under a tree. It made a significant difference over his stock FD leading coilpack.