Fitting QR25DE coil packs - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

oewoko · 10-02-2017, 05:00 PM

Hey all. I've had enough with my spark plug blowout issue. Gapping tighter, then using liquid tape all over the coil pack, and then trying regular electrical tape, I still have blowout. Although much less, it is still intermittent, and with a planned turbo upgrade, I might as well make my ignition beefier.

If you ask why not LS coils, it's because I have a whole set of the QR's for free. And with being coil on plug, less work without having to mount the coils.

Now I just test fitted them, and I have this gap between the valve cover and the top portion of the coil pack. My question is this ok to leave open, or do I need to seal it somehow?

I have also included a pic comparing a few coils.

Left, VQ35HR
Middle, QR25DE
Right, SR20DET

I had a spare VQ coil cause I'm trying to figure out a stumbling problem on my G.

The SR is shorter by about 1 inch. What do you guys think?

Googling only shows that people have used both the VQ and QR coils, but no how to's or install photos. Thanks for any help

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TheRealSy90 · 10-02-2017, 08:46 PM

Pretty self explanatory. If you leave it open there is potential for water or debris ingress into the hole.
VQ coilpacks are plug and play if you switch two wires on the coil plugs and delete the ignitor.
If QR coils have the internal ignitor then I would assume the same.

Bolting them down is up to you.

blksylv · 10-02-2017, 10:52 PM

Vq coils are plug and play with an ignitor bypass and a s15 coilpack harness. I still have a gap on mines as far as not sealing to the vc. I just don't drive it when it rains out lol. Here's a pic of how I have mine bolted down. Just made a small bracket for each one.

TheRealSy90 · 10-02-2017, 11:11 PM

S15 coilpack harness isn't required. S13 harness plugs right into them.

oewoko · 10-03-2017, 04:10 PM

Thanks for the reply. I'll go forward with the swap, and update this thread. I'm going to try to seal the gap.

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LoSt180 · 10-20-2017, 01:24 PM

Quote:

Originally Posted by TheRealSy90

S15 coilpack harness isn't required. S13 harness plugs right into them.

Connector plugs right in, but needs to be rewired at the coil pack side. Basically flipping 2 pins. Pretty simple and I've written up the diagram before.

TheRealSy90 · 10-20-2017, 09:29 PM

Right, that's what I said in my first post in this thread lol.

10-02-2017, 05:00 PM	#1
oewoko Zilvia Member Join Date: Apr 2002 Location: new jersey Posts: 154 Trader Rating: (2) Feedback Score: 2 reviews	Fitting QR25DE coil packs Hey all. I've had enough with my spark plug blowout issue. Gapping tighter, then using liquid tape all over the coil pack, and then trying regular electrical tape, I still have blowout. Although much less, it is still intermittent, and with a planned turbo upgrade, I might as well make my ignition beefier. If you ask why not LS coils, it's because I have a whole set of the QR's for free. And with being coil on plug, less work without having to mount the coils. Now I just test fitted them, and I have this gap between the valve cover and the top portion of the coil pack. My question is this ok to leave open, or do I need to seal it somehow? I have also included a pic comparing a few coils. Left, VQ35HR Middle, QR25DE Right, SR20DET I had a spare VQ coil cause I'm trying to figure out a stumbling problem on my G. The SR is shorter by about 1 inch. What do you guys think? Googling only shows that people have used both the VQ and QR coils, but no how to's or install photos. Thanks for any help Sent from my SM-N910V using Tapatalk

10-03-2017, 04:10 PM	#5
oewoko Zilvia Member Join Date: Apr 2002 Location: new jersey Posts: 154 Trader Rating: (2) Feedback Score: 2 reviews	Thanks for the reply. I'll go forward with the swap, and update this thread. I'm going to try to seal the gap. Sent from my SM-N910V using Tapatalk