Needing some ideas on where to put my blaster 2 coils. Any pics would be great! Thanks.

 

.

 

I put mine in the trash can. (eBay actually) When I had my car on the dyno last year, the MSD-6A and dual blaster coils that I had on the leading ignition were breaking up in the upper RPMs. We swapped out the MSD stuff with a stock coil and I picked up 6 RWHP. Moral of the story? The stock ignition rocks.

Here is a pic of where I did have the coils mounted. It's a stock coil base with a piece of aluminum bolted to the 4-posts.

 

aww man what a way to bust someones chops. anyway cool Im glad I decided against getting blaster coils.

 

lol, irony. Testement to stock ignition though, hep hep! I think thats pretty funny.

 

yep i think the blaster 2 coils are less powerful than stock

 

huh???????????????? Are you guys serious???? what about this guy???????


http://www.zaxjax.com/upgrade_your_ignition_system.htm

 

remember everything you read on the internet is not true! sorry you found that out the hard way... i found out a week or so ago heres my thread and a few opinions on it....

https://www.rx7club.com/forum/showth...highlight=coil

 

It is widely agreed upon that the stock FC3S coils are very good for stock units.
A very loose indicator of coil performance is the size of the coil, and the FC3S coils are pretty damn big for stock units.

A CDI box on the leadings can offer better ignition performance.

Going beyond that is only really necessary for those shooting for over 400hp.
It gets very expensive to do so anyways.


by reted whom I trust on this site. I am pushing for some pretty big hp numbers, not huge but something alot better than stock see sig. I know I don't need them but I already had an msd 6a lying around with one blaster coil and I just bought another coil from ebay for something like 25 bucks so an upgraded iginition for 25 bucks is pretty damn good in my opinion however if it is going to decrease my power than screw it! However that has never been the case with anything I have ever read on this site or any other for that matter. Maybe wozoom's coil(s) where bad or not putting out the correct voltage but I don't think, even though the stock coils are good, the msd would be a down grade.

 

Well, they list the max output amps as only 140 mA for the Blaster 2- that is low.

I know my Crane LX-92 coils are 510 mA output and I believe MSD themselves make race coils w/ over twice that LX-92 current output.

 

Any idea what the mA numbers for the leading stock coil is?

 

Actually, second thought; Those trailing coils are huge. If I got another set of trailings off a junked 7, and put them on in place of my leading, would I see a gain?

I am considering getting a CDI box and wondering if a coil upgrade is even remotely benificial.

 

Just simply talking about the amperage without talking about the voltage is just silly..

The blaster 2 coil puts out 45,000 odd volts if i remember correctly..
Now i don't know the turn ratio in the stock unit, but my _guess_ is that it puts out a far whack less than that... maybe more amperage put almost definatly less voltage.
The higher voltage should mean less breakup under extreme conditions (ie, huge boost, high RPM)

Amperage aint everything.......

Ask all the 1st gen guys who are using DLIDFIS with blaster coils.. They'll all swear they near have a problem with ignition break up in the high RPM regions, however some people HAVE had a problem with that when using the MSD unit..

Soooo maybe it's not the coils to blame..

I'm now running a distributor on my car and about to switch it to a DLIDFIS setup..

 

anyone else want to add to the msd ingnition system saga???

 

Just simply talking about the amperage without talking about the voltage is just silly..

All MSD coils from the 140 mA Blaster 2 to the 1,200 mA race coils are rated at 45,000 Volts max. What does that tell you about the voltage requirements of a high performance coil Vs the Amperage requirements?

You do need high voltage to jump the gap, but once you start adding boost, compression, oil and gas fouled plugs you need A LOT of Amperage to make or sustain the arc.

Think arc welder...

I know w/ my crane Hi-6 and LX-92 per leading plug (stock trailing) it can run smooth and hard through INSANELY rich mixtures @ 17pis boost+ to redline- as in pegging meter at 8:1 A/F w/ no hint of break-up or bog.

My Hi-6s are under the cooling panel and you can see the LX-92 coils in the upper right of pic

 

I don't have the Blaster Coils but I do have tons of space that will allow me to relocate both Coil Packs towards the opposite to the Spark Plugs. Doing It this way will create a bilateral emptiness of the Inner Fenders (big deal, I know) and from there I will shorten the Spark Plug Wires for less travel.

 

Voltage is more important to amperage.
In fact, mJ (milli joule) rating is even more important that amperage.
Amperage is the LAST thing you should be looking at.
With a CDI, it becomes even more insignificant, since spark times are quite short.



-Ted

 

so tell me are the blaster 2's going to be ok or should I use a differant coil with the msd box???

 

The blaster coils are ok and will work with the MSD box. But the general consensus is that they are a waste of money vs. a properly working stock coil. You will not see any benefit in HP.

Originally I ran the stock leading coil with the MSD. This worked well for about 6 months, then I started having ignition problems in the upper RPMs. Stock coils hardly ever go bad but mine did after having the MSD was connected to them for 6 months. coincidence? Maybe.

That was when I purchased the Blaster 2 coils. This helped and I could feel an improvement over my dieing stock coils, but the dyno showed otherwise. I present my original dyno sheet and my new one. The only difference being the ignition is MSD in 2002 and the ignition was stock in 2004. You can see the ignition breakup in 2002...

 

Its not amps that makes a spark its volts.

The higher the amperage, the lower the voltage, the more intense, but the smaller the spark

the higher the voltage, the lower the amperage, the less intense, but bigger the spark.

 

hum.................sounds like this is deffinatley a matter of oppinion topic. Now wonder this topic doesn't come up much. Well thanks everyone for putting your input in however I still don't think I got what I wanted out of it. I am looking to see if

a) Stock coils put out more volt/amps then msd blaster 2

b) some sucess stories of the blaster 2 coils, since we've heard the bad.

I don't know this is probably one of those things that I'm going to have to just try out on my own. Remember I got this ignition system for like 25 bucks so I don't care if its necessary or not I just want to know if it is going to be at least as good if not somewhat better than the stock coils / ignition system.

 

OK, you guys aren't going to believe me about amperage vs voltage requirements of ignition systems so,

a 5 second Google search reveals

http://www.chevyhiperformance.com/techarticles/45618/

See, match in combustion chamber = low amperage system. Cutting torch in combustion chamber = high amperage system.

I guess they liked the cutting torch analogy better than my arc welding one?

To quote the linked source

The more current pushed across the plug gap, the better the chance for more complete combustion.

You guys said

but, you are thinking about the spark plug as if it were outside of the engine- you have to think of the spark as it relates to igniting the mixture.

If you want to keep spreading your gap you will indeed need more Volts to ionize the gap. Not too many 2nd gen guys even use adjustable gap plugs!

CD ignitions
do have a shorter duration and so use multiple strikes at low rpms when there is time for it and then switch to one strike. The shorter the duration of the strike the more important it is that there is lots of current flowing to ignite the mixture!

 

Of course you'd want **** loads of current going across...
point being that about two poofteenths of **** all current will go across if you don't have a high enough potential difference between the gap.

Hence why you need a high voltage.

Of course you'd want both high current and voltage, but then you have to ask how much power you want your coils to suck up and how big you want them?

If you are having ignition break up in the high RPMS and its not caused by the ignition switching system(Ie, MSD Box) then you want a high voltage across the gap before worrying about getting more amperes across the gap(which you can do by bumping up the primary winding voltage with a CDI anyway...)

 

All the coils have plenty of voltage capability.

Perhaps another analogy will help in understanding. If you are shocked by a 1,000,000 Volt Tesla coil w/ verly low amps and your heart does not fibrillate and kill you you will be OK. If you are hit by 1,000,000 Volt lightning at 200,000 Amps you may explode or at least have your hair and clothes combust.

We want the air fuel mix to combust.

 

I believe the stock coils are rated aroung 50,000 volts out put. I remember rading that somewhere. the same article stated that the second gen rx7 has one of the best ignition systems out there. a pace setter in 86.
Also I have have an MSD 6AL on my seven for over two years with no problems and improved upper power band, easier starting, and better fuel economy. I was going to upgrade again to a Jacobs system, but I'm having trouble finding one now. I have heard the rotary pac was discontinued.
Quote:
"Its not amps that makes a spark its volts.

The higher the amperage, the lower the voltage, the more intense, but the smaller the spark

the higher the voltage, the lower the amperage, the less intense, but bigger the spark."
that is only true if power remains constant. your explanation is perfect if you were talking about wireing speakers. if the power is to remain constant, lets say 100 watts, and you wanted to hook up two 4 Ohm speakers instead of one. If you wired them in parallel, you would yeild a 2 Ohm load. the amp sees this and doubles the ampers. to get a gross of 200 watts,or 100 per speaker. now if you doubled the voltage, you would quadruple you watts.
Back to the topic.
if you want to keep replacing plugs then up your voltage. it is better if your amperage increases too, you won't burn them as quickly. a higher voltage will jump a larger gap. and the incresed amerage make a larger kernal. the latter more imortant to me since I can't change my gap.
it really only helps if you can make a wider gap for the spark to jump. I played with this a little a couple of years ago. I didn't /don't have the right equipment. I just took out my dremle and took off a bit. it was tedeous and imprecice... much like my spelling.
I think there could be some gains there, but I think you need a cnc machine to do it right.
I like the MSD. I have had good results from it on two of my 7's. better on one than the other, but both improved.
have fun