AJC13B

Just wondering what coils you guys are using and what success you have had with them?

I am about to push the limits of the standard 2nd gen coild when I wind the boost up to 25psi with C16 and the coils are a bit of an unknown entity here with egards to big HP. Most of the big guys here are running Bosch HEC coils or full CDI units.

And, not to sound like a *****, but I don't want to hear how your 3rd gen with intake and exhaust mods only runs right with a HKS twin spark whatever...if you are not making 500+ to the back wheels, I don't want to hear

crispeed

Hey Steve!
I also use 2nd gen coils on every build up that I do may it be 1st, 2nd or 3rd gen. I've never really pushed them pass high 300 or low 400 rwhp though without some type of CDI unit, MSD being my first choice. In my opinion it's not worth the problems or damage that can happen at high horsepower/boost levels when a misfire occurs.

crispeed
87 Rx-7 TII
9.20@150mph

soul assassin

i still use the stock 2nd gen coils, my tuner told me to take the new volt off, so my system is completly stock except for accel 10.8 mm wires he swears they are good too 600 whp

HWO

would i be right in thinking fuel quality has a lot to do with when CDI or similar is needed?

HITman says upto 20psi or methanol and the factory coils/ignitors are definitly upto the task. yet a lot of the US guys seem to go to CDI's with factory turbos and bugger all mods. after reading some of the stuff on the haltech help list over te past month i have come to the conclusion that gas quality in the US must be **** compared to everywhere else so i reckon it has something to do with it.??????

AJC13B

cris - What gas are your cars running? C16? I have run 23psi on pump gas and did not experience any apparent ignition break up, but 25psi and C16 may be a different equation altogether....

hwo - I think alot of the people that run the HKS twin spark and MSD ignition modules etc do so because they can then have an MSD sticker on their car Alot of the cars, like you said, are stock or close to it.

HWO

either gas quality or its a case of sheep-ness like it is with electric water pumps. after reading a lot of info on electrci water pumps over the past couple of weeks the conclusion was drawn that its an upgrade from old school iron block v8 days and the import guys are stilling thinking along the same lines even though its not needed. because they needed cdi's/MSD stuff on their dino ages v8 they think they should put them on their modern rotary engine too

AJC13B

Sounds about right to me

Guess I will find out soon enough....

RICE RACING

Guys, CDI are necessary if you wan't to make the maximum power, but more importantly the y are needed if you want to run race series plugs (11.5's) which make the most power and resist detonation the most as well.

11.5's will work with stock based ignitions however you need to warm the engine first on stock plugs, and be prepared for mild engine misses untill the plug warms enough to "self clean" and run right.

If you run stuff like water injection and high boost or power levels over 500BHP (engine power) with coldish plugs then you need a CDI either that or put up with mild engine misses and less engine power and lower fuel economy.

I run a MSD 6A on my leading plugs, and so do a few of my customers...the gains are quite noticable, but do not expect earth shattering power increase.

AJC13B

Thanks Peter,

The only thing I am worried about is misfires because of the ignition spark being blown out at high boost pressure. More than likely I will be running the 11.5 plugs along with C16 and 25psi.

To be honest, I don't think 600rwhp is out of the question but its just the spark issue that may be the problem. Realistically, the car will only see this sort of boost/fuel combination once...once it runs a 10 it won't be allowed back on the track.

Is there a short term solution?

Boostn7

Just recently I swapped the factory T-II coils with MSD Blaster2 coils(2) while still retaining the factory igniter juiced by a MSD 6A.
Well....after 2 hours I went back to stock coils....
The Blaster2 coils actually showed a weaker spark compared to stock coils.....quite noticeble.

Later,
John D

crispeed

Hey John!
I told you that the factory TII coils are very good. Actually I don't think there are any other coils more reliable for a daily driver. The factory coils have the best balance between fire power and reliability!

crispeed
87 Rx-7 TII
9.20@150mph

fast13b

I plan on keeping the stock leading coils, however, I have tried no less than 6 different trailing coils on my MSD setup and they all arc BADLY out of the coil so I'm putting on a pair of Blaster 2's on the trailing to try and supress that situation...