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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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05-05-2016, 05:00 PM | #1 |
Zilvia Addict
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Oem vs split fire S15 coils
Doing some changes to the car including a completely new wire specialties pro harness.
Last time on the dyno we would blow the spark blow out just before 500hp. Yes we tried replacing plugs as well as tightening the gap dowm. The factory coils are from a 2001 S15 so they are 15 years old. Was going to replace them with either new oem S15 coils or Split fires. Any one have any actual experience with testing split fires vs new oem coils? Thanks
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
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05-05-2016, 06:27 PM | #2 |
Nissanaholic!
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I had the same issue on my R33 RB27. Upgraded the OEM coilpacks to splitfire and HKS Twin Spark amplifier and all issues of spark blow out were gone. Car made 550awhp on pump and went from 622awhp on race gas to 742awhp after getting rid of the blow out.
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05-05-2016, 06:50 PM | #3 |
Zilvia Addict
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Unfortunately your scenario also has a twin fire ignition added into the picture.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
05-05-2016, 08:42 PM | #4 |
Zilvia Addict
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05-05-2016, 08:51 PM | #5 | |
Zilvia Addict
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Quote:
I have a S15...
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
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05-05-2016, 09:05 PM | #6 | |
Nissanaholic!
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Quote:
S15 coils are skinnier and the valve cover holes aren't as large to accommodate those. |
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05-06-2016, 09:21 AM | #10 |
Zilvia Addict
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Regardless of the cosmetic difference the coils and wiring themselves are different. A S15 coil has the igniter built into the coil. It's not separate like a S13/14.
So back to new S15 oem coils vs these split fires.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
05-08-2016, 04:55 PM | #11 |
Zilvia Addict
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Have you checked out the VAG/R8 coil option? They're pretty cheap ($25 each), just have to do the wiring or buy a premade pnp harness.
Have the option to get split fires over here but don't like the idea that you have to buy another whole set if one coil goes out. |
05-08-2016, 05:07 PM | #12 | |
Zilvia Addict
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Quote:
Not being able to by a single coil from spitfire is a big down side. I am ordering a completely new wire harness for the car from wiring specialties this week. It will be their S15 in a S14 pro harness.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
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05-08-2016, 08:38 PM | #14 |
Zilvia Addict
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I know this is common with s13 and S14 but how would you make them work with a factory ecu on a S15?
s15 coil wiring and design is completely different.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
05-08-2016, 08:53 PM | #15 |
Post Whore!
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The only real difference is the S15 coil has the ignitor on the coil. The entire concept is the same and the wiring differs minimally
<------ I went from a S13 cover and S13 coils, to bypassing the ignitor and running S15 coils in a S15.3 valve cover. Look into AEM pencil coils if you want a clean install or LS coils for the best bang for your buck (but asthetically not as pleasing since they use wire and plug and have a massive ignitor separate from the plug) |
05-08-2016, 09:12 PM | #17 |
BANNED
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I believe you need to upgrade the coil pack harness for the splitfires as well. Thicker gauge wiring. My buddy had them on his s15, he upgraded through wiring specialties because he was having an issue with power supply
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05-08-2016, 09:15 PM | #18 | |
Post Whore!
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The go with splitfires or AEM pencil coils
Wiring is not an issue (and to the gentleman above: No, you do not need to "upgrade" wiring for splitfires. They are a direct drop in for stock wiring/harness) Quote:
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05-08-2016, 09:39 PM | #19 |
Zilvia Addict
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I already have a wiring specialties coil pack harness anyways.
Do the AEM coils have the igniter built in to the coil also?
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
05-09-2016, 06:11 AM | #20 |
Post Whore!
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Some of them are smart coils, others require an ignitor. The ones on my car are "dumb" coils and I'm running a factory ignitor. Give AEM a call and see what they recommend. You can always get dumb coils and utilize an aftermarket ignition system for them. This would allow you to increase dwell time, resulting in a better spark. You'll melt the S15 coils trying to get more dwell time out of them.
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*My SR20VET* Does your VTC gear rattle in your S14/15 SR? PM me. |
05-09-2016, 07:33 AM | #21 | |
Zilvia Addict
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Quote:
That's a good idea. I think I will give AEM a call. Going to eventually be switching the car over to a AEM Infinity anyways.
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98 240sx w/ S15 SR20DET, T2 20g, 11.22 @ 124.98 |
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