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RB25DET misfire under load/boost

BASHERnissan
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BASHERnissan Contributor

BASHERnissan

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Posted

I recently bought an R33 gtst with series 2 RB25DET. I turned the boost down on my manual boost controller when I gave it an oil change now whenever It hits boost or even half throttle it will misfire and WON'T STOP at all... Check engine came on after oil change

Has link g4 440 injectors bigger turbo 42mm wastgate and straight pipe... Tuned to 240kw on 15 psi

Changing coil packs and sparks this week.. any help appreciated thanks 

 

 

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https://www.sau.com.au/forums/topic/477087-rb25det-misfire-under-loadboost/
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GTSBoy Grand Master

GTSBoy

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Posted (edited)

Splitfires are not expensive now. They are the same price as they have ever been, possibly cheaper in real terms. They are still the cheapest & easiest way to do a coil upgrade.

They are, however, not really any different in terms of performance & quality than the original Nissan ones, which have been popping up here and there over the last few years. The problem with buying "OEM" ones is that they are probably easier to counterfeit.

The smart approach these days is to replace with a modern pencil coil. Your choices are to buy a kit that uses Toyota/Denso coils (such as Yaris, or any of the 1ZZ tyes) and necessary wiring adaptation & mounting bracket, or to buy Nissan type (R35 GTR, VQ370 types) and the necessary stalk adapters and mounting plate. The Toyota options are cheaper as kits. The easiest/best Nissan options will cost you over $1k, but are the absolutely f**king duck's nuts in terms of performance capability, for a coil that can fit in the factory spot.

Edited by GTSBoy
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niZmO_Man Grand Master

niZmO_Man

Posted
Posted
2 hours ago, BASHERnissan said:

Split fires are so expensive wow

 

Not really, $600-odd for bolt in is good. When you compare it to cheapo red/yellow ones, yes, but they're on par with OEM and cheaper than the R35 route.

 

In the mean time, gap your spark plugs to 0.7mm and see if that makes a difference.

tridentt150v Grand Master

tridentt150v

Posted
Posted

Dead coil packs affect the whole range....not just higher up.  Red is dead, Blue is true.

If you don't believe us, take the coils and get them tested.

Otherwise take it to a workshop and get their input.

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