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Splitfire Coils, Make A Huge Difference

manuel

By manuel,
in Engines & Forced Induction

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manuel Community Regular

manuel

Posted
Posted

i had my r33 gtst tuned at Unigroup engineering sydney and made 254kw atw with GCG high flow. When the car was getting tuned it developed a miss at 240kw mark. The boys gapped my plugs down to .65 to resolve the issue and then pumped out 254kw. My stock coils are very old and have been siliconed by some one at some stage.

Sourced some used splitfires from the SAU forums and then regapped my plugs to .95. Installed everthing and then went for a drive.

What a difference....... more response, crisp acceleration, pulls harder in the high rpm mark, definately gained a measurable differnce without a single miss in the rev range. Car breaks traction easier.

I recommend splitfires to anyone who has old coils, you can run a bigger gap with plugs and you will feel the difference

Worth ever cent

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted

Wihout wishing to knock Splitfires all you are really saying is "if your coils are stuffed putting new ones in will make your car run better".

What would be more useful to know is stories of failures. We know that the Nissan coils are good for around 15 years (and I have seen two examples recently of people who have forked out for new stockers on the strength of this i guess) so it would be good to know how long before Splitfires, Yellowjackets, DSRs and other aftermarket coils start failing.

Guilt-Toy Grand Master

Guilt-Toy

Posted
Posted

Yavus is a champ! You need to take the car back to him and get him to whack it back on the dyno to see the difference in horse power and overlay the power curve with the old one when it was tuned.

Then post the results. That would make this thread worth reading for a alot of people im sure.

horrace Rising Star

horrace

Posted
Posted
Wihout wishing to knock Splitfires all you are really saying is "if your coils are stuffed putting new ones in will make your car run better".

What would be more useful to know is stories of failures. We know that the Nissan coils are good for around 15 years (and I have seen two examples recently of people who have forked out for new stockers on the strength of this i guess) so it would be good to know how long before Splitfires, Yellowjackets, DSRs and other aftermarket coils start failing.

How much are they new from Nissan I wonder, I have a bad misfire at the moment an I like your way of thinking.

KiwiRS4T Grand Master

KiwiRS4T

Posted
Posted
How much are they new from Nissan I wonder, I have a bad misfire at the moment an I like your way of thinking.
Quite a bit! But it varies from dealer to dealer. You need to lnow someone who can get trade prices to get you a quote.
erderr Contributor

erderr

Posted
Posted

Yay for missfires!

I've got another question to throw into the bunch; I've always heard when people are recommending spitfires that they are designed for a higher boost (1bar/14psi >) where standards are designed for a lower boost setting like near standard (7psi).

Is this true? Or do you think it is more due to the stock coils age?

Geoff - If your not sure, tube a short video, I'm sure someone could confirm if what you hearing of a morning is a missfire or not.

Brandon Veteran

Brandon

Posted
Posted
The car sounds like a machine gun and makes popping/farting sounds.

My car pop pretty often when I shift from 1-2-3. Is that considered misfiring? It sound like any other rb and doesnt feel theres a loss of power too.

Spurdo Experienced

Spurdo

Posted
Posted

PM-R33:

i think just about every owner of a skyline over 10 years old has experienced misfire from coil failure, i'm no exception. when mine failed it would behave exactly like yours is in the video. my flatmate is a mechanic and he says the coils can be bench tested to isolate the bad coil but im skeptical of this because if the spark is earthing out through the casting into the head then (in my mind) bench testing might not emulate these conditions. chances are its only one playing up - for now. but if you just replace one and the rest are still old then sooner or later the others become likely to fail also, so for complete piece of mind you'd get a whole new set.

also a note to all: if your getting misfire, you'll probably notice it gets far worse as you run more boost, and i've been told misfiring is a good way to destroy your engine's bearings. so if you get misfire, wind your boost right down and gap your plugs down, and stay off the boost as much as you can until you get it sorted out.

Galois Veteran

Galois

Posted
Posted

anyone got stories on why to buy $600 splitfires over $400 yellow jackets? nissan parts dealer wanted almost $1200 for new coilpacks, its madness. have to say though, from what ive read they're probably the best of the options...

i had a bad missfire and the car was pretty much undrivable towards the end of my last plugs (coppers) life. it was really, really bad. changed to 0.8 gapped fr7dp bosch platinums and problem is mostly solved. i have to get new coilpacks, but uni is insane atm and i only work part time so coughnig out a few hundred on coils is difficult (till i sell the kart :bunny:), so heading to bunnings for some silicon!

r33cruiser Grand Master

r33cruiser

Posted
Posted
PM-R33:

i think just about every owner of a skyline over 10 years old has experienced misfire from coil failure, i'm no exception. when mine failed it would behave exactly like yours is in the video. my flatmate is a mechanic and he says the coils can be bench tested to isolate the bad coil but im skeptical of this because if the spark is earthing out through the casting into the head then (in my mind) bench testing might not emulate these conditions. chances are its only one playing up - for now. but if you just replace one and the rest are still old then sooner or later the others become likely to fail also, so for complete piece of mind you'd get a whole new set.

also a note to all: if your getting misfire, you'll probably notice it gets far worse as you run more boost, and i've been told misfiring is a good way to destroy your engine's bearings. so if you get misfire, wind your boost right down and gap your plugs down, and stay off the boost as much as you can until you get it sorted out.

Really? Im still on my 15yr old coils and I have never had a missfire issue. I'm also running 16psi from a 35R, and still no issues.

I'm of the mentality that "if it aint broke, dont fix it". When and IF they fail, thats when they will be replaced by splitfires :bunny:

Spurdo Experienced

Spurdo

Posted
Posted (edited)

r33cruiser: im not gunna lie, thats impressive, i didnt mean to imply every coil pack dies on their 10th birthday. but it seems from my experience and almost all others ive known of have failed to some extent between 10-15 years. i'd say your rather fortunate to still be on original coils especially at 16psi without issues. what plug gap do you use?

yea it would be interesting to see the return/failure rate from yellow jackets vs splitfires vs the no name ones that come out of china. to be fair though the stock ones last 10-15 years in general and assuming thats when most of them were replaced (r32) with something else that gives almost all of the new ones still another while before they should be breaking down again. i've heard of one yellow jacket failing a week or so from new but no other failures from my knowledge. split fire has supposed "comparison" dyno charts on their website to show back to back results comparing their coils to oem ones but i dont really trust them as of course they probably handicapped the tune with the oem coils. i have seen one independent back to back dyno test done in nz between the split fires and the chinese red ones, 0.1kw difference atw on a 500hp gtr.. but your not likely to get exactly the same reading each time on the dyno so one might say absolutely no difference.

Edited by jonboy
PM-R33 Grand Master

PM-R33

Posted
Posted (edited)
PM-R33:

i think just about every owner of a skyline over 10 years old has experienced misfire from coil failure, i'm no exception. when mine failed it would behave exactly like yours is in the video. my flatmate is a mechanic and he says the coils can be bench tested to isolate the bad coil but im skeptical of this because if the spark is earthing out through the casting into the head then (in my mind) bench testing might not emulate these conditions. chances are its only one playing up - for now. but if you just replace one and the rest are still old then sooner or later the others become likely to fail also, so for complete piece of mind you'd get a whole new set.

also a note to all: if your getting misfire, you'll probably notice it gets far worse as you run more boost, and i've been told misfiring is a good way to destroy your engine's bearings. so if you get misfire, wind your boost right down and gap your plugs down, and stay off the boost as much as you can until you get it sorted out.

Ohh dude, that aint me/my car in that video I posted (if you notice its a R32/RB20). That's just some random video on youtube that I found lol.

I am well aware on what a missfire is and how to fix it.

Edited by PM-R33

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