LQ9 (LS1 variant) coil wire option

[nathaninwa]

So Im having an inernal debate over running an MSD plug wire or running them coil on plug in the 2j. Coverting to LS1 coils involves using the this little tiny ballpoint style spring. The stock toyota coil has a female metal covering and the spring bottoms out and touches the bottom and both sides. When using this spring on an LS1 coil you have to reshape it a bit and its setup male style so there is little acutally touching the coil output. Let alone the spring pressure is all that is transfering to the plug on the tip of it.

If I run the designed plug wire it makes better contact (imo) and may transfer better spark energy.

I know lots of the 2j guys are running the modded spring and also running stock coils with spring with big power. But Im seeing an improvement here when switching to the gm coils.

Im able to mod the valve covers to keep the coils under the stock coil cover so the way the spark will get to the plug will not be seen.

What say you oh TurboBrick guys?

[gross polluter]

Just from experience with tons of boosted LSx motors I can tell you that MSD wires are complete garbage. 90% of cars that came into our shop with running issues were associated with the use of MSD wires.

That said, you'd probably see less issues by running wires on an LSx coil over trying to run it directly on the plug. The tiny conductor in the LSx coil seem to work too well when you try to adapt a spring conductor to it.

[B-lennium]

Originally Posted by Nathaninwa

I know lots of the 2j guys are running the modded spring and also running stock coils with spring with big power.

KISS ?

The GM coils are not long enough to touch the sparkplug right? why don't make longer terminal nut's. I think I have seen them somewhere on the board here.

[nathaninwa]

Originally Posted by gross polluter

Just from experience with tons of boosted LSx motors I can tell you that MSD wires are complete garbage. 90% of cars that came into our shop with running issues were associated with the use of MSD wires.

That said, you'd probably see less issues by running wires on an LSx coil over trying to run it directly on the plug. The tiny conductor in the LSx coil seem to work too well when you try to adapt a spring conductor to it.

Did you mean to say the spring does not adapt well and run a wire? I got the test fit msd wires off a gto setup my brother got for his project (crate motor ls1) so Im using them for test fitting. I can run stock gm wires, just need a direction to go is all Im looking for. And modding the covers is no biggie.

Originally Posted by B-lennium

KISS ?

The GM coils are not long enough to touch the sparkplug right? why don't make longer terminal nut's. I think I have seen them somewhere on the board here.

Neither are the stock Toyota coils. That spring is from them. Most cop setups have a spring of somesorts, most are just held internally. I have a Legend coil here and it has just a tiny pc of rod sticky out, captured, that is spring loaded.

I just dont feel comfortable with the lack of contact with the spring inside the gm coil.




The gm coil is an upgrade over the stock toyota coils. After 20 years the stockers are cracked and leak voltage, and are about 80 a pc new. You need to run the msd equivilatn box to get the spark energy that a stock LQ9 has. and the gm coil can be charged to about 5.5ms over the 2.? that a stock toyota can be charged too. the gm coils have built in igniters too.

[gross polluter]

Originally Posted by Nathaninwa

Did you mean to say the spring does not adapt well and run a wire?

Yep. The GM coils have a pin inside the coil that the connector in the wire surrounds. Adapting a spring to make good contact with that pin would be awfully difficult unless you found some beehive style spring that made good contact with the pin inside the coil AND the spark plug.

I agree though that the stock 2JZ COP's are junk. I've been running the stock VVTi wasted spark coils with great success. They're a COP on three cylinders and a wire off of the COP to the other three cylinders.

Originally Posted by Nathaninwa

over the 2.? that a stock toyota can be charged too.

On the stock ignters, yes. Ideal dwell on 2JZ COP's is about 3.4ms but the stock igniter doesn't allow that as it has built in overdwell protection and will cut spark over 2.6ms. Dumping the stock igniter will allow you to run full dwell on toyota coils, resulting in greater energy. But, the issue still remains that a vast majority of 2JZ COP's are cracked and damaged.

[gross polluter]

Actually, thinking about it a little more. If you were to obtain the connectors for the coil end of the spark plug wires and were able to crimp a spring directly to the connector you'd be able to attach the spring directly to the pin on the coil and have a solid connection that way.