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best ignition coil for fd with 500-600 hp

Old 06-13-12, 10:56 PM
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best ignition coil for fd with 500-600 hp

Hey guys. I want some of your thoughts as to what coil would be best for my street/drag rx7. I will be in the 500-600 hp range. Im using a power fc for the streetabilty and tuneabilty but not sure what coil to run. I was thinking about running the stock coils remounted away from heat. What do you guys think?
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Old 06-13-12, 11:08 PM
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It is seldom a bad idea to relocate the coils away from heat.
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Old 06-13-12, 11:19 PM
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stock GOOD set of coils and HKS twin power is the easy solution.

Or, you can hook up some LS yukon coils with built in ignitor, remove the stock ignitor and modify the wiring in the ignitor plug, wire it directly to the coils.
there is a post by alex rodriguez on this somewhere...
this setup gives 12v directly from battery to coils..



or go with some expencive mercury marine coils, they have shorter saturation time...
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Old 06-14-12, 01:58 AM
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Old 06-14-12, 10:24 PM
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Originally Posted by wutangben View Post
just started looking into these:

https://www.rx7club.com/showthread.php?t=992444
So have I. I'm curious about the longevity of these units.
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Old 06-15-12, 06:43 AM
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^ I like to think they will last a long time as they are made for mercury marine for use on outboards. They are also mounted directly on the engine in the OEM application, can you say vibration, and heat.


Because Mercury uses them on boat engines that will travel offshore and will be responsible for the lives of the people on the vessel I tend to think they are a quality unit. Especially if they are mounted away from heat and not directly to the engine, like in an RX-7.


I have these coils mounted in my car and am very happy with them, so far I have only put 2300 miles on them though.



Originally Posted by oyvindjs View Post
stock GOOD set of coils and HKS twin power is the easy solution.

Or, you can hook up some LS yukon coils with built in ignitor, remove the stock ignitor and modify the wiring in the ignitor plug, wire it directly to the coils.
there is a post by alex rodriguez on this somewhere...
this setup gives 12v directly from battery to coils..



or go with some expencive mercury marine coils, they have shorter saturation time...

Curious as to why you say they are expensive; a set of 4 is cheaper than a used HKS twin power.
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Old 06-15-12, 06:48 AM
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How you are making the power is going to depend on the strength required.

As mentioned, a good set of OEM coils and an HKS Twin Power have been proven to 600hp. However, this was done with race gas. When you start using auxiliary injection, it takes a much larger toll on the ignition, and a hotter spark is required. Also remember that an ignition is a SYSTEM, and it works together as a system.

Your options are also going to depend on what ECU you are using. The PFC is often limited, as it was designed for the OEM coil configuration with 3 triggers. It doesn't have the spark manipulation that a Microtech or Haltech does.

The link given is also a good option, the AEM coils are proving to be a quality setup. However, I don't see it being "better" than the OEM coil/TP configuration. It seems to be a simplified option. Though it's hard to argue with pushing in 2 plugs and mounting the little gold box.

I have seen some very good results from Dynatek coils, but they are far from plug & play. Peter from Rice Racing has a very narly setup that handles some serious amounts of water.
http://www.dynaonline.com/skins/Default.aspx

M&W also makes VERY high quality stuff. Bring your wallet though....
http://www.mwignitions.com/default.php

I will be turning up my boost this summer. Hoping to see 20-25psi. I am running a Twin Power, and I bought a new OEM leading from Ray at $150. I am also using NGK 6725R race plugs. I have high hopes for the system as I have seen an identical setup perform quite well. But as we all know, every car is different.
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Old 06-15-12, 06:55 AM
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Originally Posted by XLR8 View Post
How you are making the power is going to depend on the strength required.

As mentioned, a good set of OEM coils and an HKS Twin Power have been proven to 600hp. However, this was done with race gas. When you start using auxiliary injection, it takes a much larger toll on the ignition, and a hotter spark is required.

Your options are also going to depend on what ECU you are using. The PFC is often limited with aftermarket coils, as it was designed for the OEM coil configuration.

The AEM coils can be wired in to the factory wiring and can be driven by the PFC


The link given is also a good option, the AEM coils are proving to be a quality setup. However, I don't see it being "better" than the OEM coil/TP configuration. It seems to be a simplified option. Though it's hard to argue with pushing in 2 plugs and mounting the little gold box.

It has a definate benefit when you are trying to get the most out of your ignition and realize that you need to change out some high mikleage coils to get the most out of the twin power. Then the AEM coils are signifigantly cheaper than a TP.

I can certainly understand people using the TP though because of the ease of installation. I think if someone had an easily available mounting solution and wiring harness kit then the AEM coils would be much more attractive option to those who may not have an understanding of the wiring and no fabrication skills.

I have seen some very good results from Dynatek coils, but they are far from plug & play. Peter from Rice Racing has a very narly setup that handles some serious amounts of water.
http://www.dynaonline.com/skins/Default.aspx

M&W also makes VERY high quality stuff. Bring your wallet though....
http://www.mwignitions.com/default.php
...
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Old 06-15-12, 07:19 AM
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Originally Posted by RENESISFD View Post
...
I am well aware the AEM coils can be wired in. You and many others are doing just that. I did say "some" aftermarket coils. I also realize you may be adding this comment so other readers don't get confused by my comment. Just in case they didn't follow the link by Wutangben.

I agree with the AEM solution. I am very surprised an established Rotary shop hasn't put together kits. Wouldn't be much to it.

I'm also glad you are having success with them. I would be interested to see how far they can get pushed with water.
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Old 06-15-12, 07:33 AM
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Mercury marine are one of the best coils and durable out there hands down. For more powerful spark add a M&W ignition amp.

You will have so much spark you can give some to the neighbors ...
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Old 06-15-12, 08:20 AM
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^This is my plan if my setup has issues.

The M&W is pricey to say the least.... but they are good units.
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Old 06-15-12, 08:28 AM
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y

I have been researching alot on these coils. they do sound pretty promising. now would i really need that M&W amp? and where can i buy the wiring harness i saw in one of your threads. thats a really nice setup there.



Originally Posted by RENESISFD View Post
^ I like to think they will last a long time as they are made for mercury marine for use on outboards. They are also mounted directly on the engine in the OEM application, can you say vibration, and heat.


Because Mercury uses them on boat engines that will travel offshore and will be responsible for the lives of the people on the vessel I tend to think they are a quality unit. Especially if they are mounted away from heat and not directly to the engine, like in an RX-7.


I have these coils mounted in my car and am very happy with them, so far I have only put 2300 miles on them though.






Curious as to why you say they are expensive; a set of 4 is cheaper than a used HKS twin power.
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Old 06-15-12, 09:46 AM
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Originally Posted by 13bturborx7 View Post
I have been researching alot on these coils. they do sound pretty promising. now would i really need that M&W amp?

That depends on what mods you have and as XLR8 has mentioned; how much water you are injecting.

and where can i buy the wiring harness i saw in one of your threads. thats a really nice setup there.

I made my wiring harness. However, C.ludwig on the forum is the distributor for the AEM coils and can make you a harness.



Originally Posted by XLR8 View Post
I am well aware the AEM coils can be wired in. You and many others are doing just that. I did say "some" aftermarket coils. I also realize you may be adding this comment so other readers don't get confused by my comment. Just in case they didn't follow the link by Wutangben.

Yes, I just typed it just to make it a bit more clear and to answer a potential question of weather or not it can be used with a PFC. Just in case they are too lazy to click on that link.

I agree with the AEM solution. I am very surprised an established Rotary shop hasn't put together kits. Wouldn't be much to it.

I'm also glad you are having success with them. I would be interested to see how far they can get pushed with water.

BTW, I am using a Haltech PS2000, I am running them in sequential fire mode. Rather than the wastespark of the stock leading system.


I am also interested in how far they can go on water, I am currently running washer fluid which has about 20% meth.
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