Late Model 4a-gze Coil Packs

[ancullen]

As many of you will know, I have a KE55 with a late model 4A-GZE (probably AE101). This runs the standard distributor-less twin coil ignition system, controlled by a Microtech MT8 ECU.

 

Due to some bad wiring issues, one of my coils died, and I need to get a replacement. Unfortunately, these coils seem VERY hard to find. So if I can't get one of the standard ones, I need to know what other coil packs can be used instead. Someone has suggested to me that Commodore coil packs would do the trick, but I want to be certain before I start playing with things.

 

Have any of you had experience with this version of the 4A-GZE and it's ignition system? If so, what coil packs did you use? Or, if you're an expert of EFI/ignition systems (eg. NickZ), could you suggest a replacement coil pack that would be suitable.

 

BTW, I have not created this thread for conjecture on what could possibly be used by non-experts. If you don't know or are not certain, don't bother answering. And yes, I've searched this forum and Googled rather extensively with various search terms and phrases.

 

And in case any of you have any spare coil packs laying around that you wish to sell, the part number for the coil pack I need is:

90919-02172

029700-6290

(This was how it was displayed on the coil pack, on two lines).

 

Thanks in advance! :P

[Taz_Rx]

something I've been looking into lately is these......

 

http://cgi.ebay.com.au/New-SplitFire-Di-Ig...1QQcmdZViewItem

 

then you can get rid of the waste spark twin coil setup in the ECU tune, and go sequential injection if you haven't already. :P

 

Might just wanna investigate if there is much height difference between the 4a - RB/SR "plug length", ie from top of spark plug to cover between rockers. :P

 

Think they have built in ignitors as well!

 

Edit:

The difference between the RB25DET series 1 and series 2 Splitfire coil

packs are the igniters. The series 1 have separate igniters, where the

series 2 are built in. You should be able to tell by looking at the

existing coil packs. Alternatively you could look up the engine number

with Nissan.

 

from this add....

http://cgi.ebay.com.au/SPLITFIRE-COIL-PACK...1QQcmdZViewItem

 

Si.

Edited January 8, 2008 by Taz_Rx

[ancullen]

Thanks Si. I'd prefer something that doesn't require retuning of the ECU if possible though. I'm not sure if I've got sequential injection - I do know there's a seperate Microtech ignitor controller or something in my engine bay - I'll take a look in the engine bay next time I get a chance to get more details.

[cuzzo]

haltech twin coil?

http://www.justenginemanagement.com/ignitionsystems.htm

[ancullen]

The Haltech's look good - assuming they'll plug and play with my system. For $60 each I'd buy two new coil packs.

[Taz_Rx]

That would most likely be a microtech X4 ignition module, looks like this......?

http://microtechefi.com/microtech-products.php?product_id=7

 

I'm wouldn't call myself an expert like NickZ or anything, but I've been doing a lot of research (or hands on learning) lately to try fully understand everything I'm doing in the new setup. Basically won't put something in until I know what it is and how it works, so here's a small bit of info I can give you:

 

To be running a distributor-less ignition system, the ECU is getting a dual pulse input signal from the crank/cam sensor which indicates the position piston #1. The ECU gets a single pulse for all other cylinders.

These pulses are used to fire the injectors in either bank mode or sequential. Banked is obviously firing all at once, on every single and the #1 dual pulse. Or with sequential, because the ECU knows the position of #1, and the firing order, it can individually fire injectors when fuel is actually needed in each cylinder!

Personally I think, if you're not running sequential injection already, then it would be a good thing to look into, even if it is going to cost you a little extra in tuning fees!!

 

Just learn something else as I was typing that!: was going to say that you could probably change your ECU to seq your self if you had a hand controller, as its not changing the air/fuel or load maps, but just the way they fire. But then I realised it would need some re-tuning as the injectors are firing 25% less, and would have to fire 400% more in one hit!!

 

Any, bit side tracked, back to ignition. If you do have an X4 ignition module, then they can run 2x dual coils (waste spark) like you have, or 4 seperate coils. It's basically a 4 channel ignitor (if you have an older one). If you don't know what ignitors do, they're basically just an earthing relay - As the ECU fires the coil by pulling it to ground, it needs the ignitor to relay the grounding so it doesn't fry the ECU. A normal relay would theoretically work if you wired it right, but would not cope with the high loads and wouldn't switch fast enough at high RPM.

 

Anyway...what I'm trying to get at with the above dribble is that the setup you currently have give you a few options in what you do now.

1, Just replace the dual coil (or both) and leave it how it is, with no 'real improvement'. Pretty much any of the coils in the links in this thread will do, or a commonwhore one as you mentioned, tip - MSD make after-market replacement ones! :)

2, Up grade your ignition system to 4 coils for more accurate spark. Obviously this will require some re-tuning, but you could also do the seq injection thing at this time if your not running it now.

3, Do some more research into other types of higher end ignitions systems like an MSD unit or another type of CDI system.

 

Having read your projects thread etc, you don't seem to be the type of guy who just 'fixes' things, but improves them!!! So I doubt we'll be seeing you go for option 1 if you know whats good for you! :P :P

 

 

BTW, check out the price difference in say the M&W ignitors between the place cuzzo linked and wolf!!.......

 

http://wolfems.cart.net.au/cat/6164.html

 

Both those links have a bit more info in them.

 

[/rant] :)