Missfire Or R&r?

[portaz]

Hi guys u have spent a few hours searching but most if the info I have come accross is for gtst and the like, anyway I have a 32 gtr with tbe, pods, and profec b, during tuning on the street u have never had this issue but at wsid this week on my second pass I noticed a miss developing then would clear at around 5500 rpm, third pass was worse so I didn't do anymore runs, on the way home I switched to low boost and it's fine but at high boost 14.3 psi it misses? Now aren't they supposed to run 14.7 with restrictor removed? It was very cold at wsid but seems strange to not have done it before, i hadn't heard of r & r before but during searching missire relates posts I came accross it and some people saying over 10psi can trigger it? I have removed coils and am replacing plugs with copper capped at .8 and replacing fuel pump and filter just in case but there are no visible issues with the coils and that brings me to another question in terms of taping or siliconing coils all the pics are of gtst coils so how do u do it on a gtr? Do I fill the gap around the coil an it's little metal frame with silicon or is there another way? Sorry to bring up such and old issue but believe me I have searched since Wednesday night in this issue,

Scott

[Shazza24]

I am inclined to say coils,etc as R&R would probably not make it misfire... From what i can tell sometimes coils can look ok but still be starting to deteriorate.

Not sure if you have the ignitor separate from the coils, but that could also be a problem.

Sorry i cant help more.

[Craig19789]

Hi mate, sounds like coils to me too. My 33 GTR was missing at higher boost when I hit around 5500RPM on the dyno. The dyno print out showed a fluctuating flat spot all the way till the boost came down.

I went with some new plugs and it was no different.

A set of yellow jack coils later, it will boost all the way up to 21PSI without a single hesitation.

It was suprising how much power it had up top and how harder it pulled.

[portaz]

Thanks for the quick replies guys I have just siliconed the coils to see if that fixes it and if it does I will get some spitfires tomorrow

Scott

[DVS JEZ]

Try some bkr6e spark plugs. They are .8mm instead of 1.1mm so its easier on the coil packs.

[R31Nismoid]

I don't even think GTR ECU's have R&R.

They aren't a RB25 ECU where you run 10-11psi and they shit themselves randomly.

I made around 270rwkw through a stock GTR ECU on 1 bar with -9s

Didnt fritz out at all

[portaz]

That's good to know guys I have installed the plugs and will see how the coils go I guess but I am happy to replace them if need be, that would be why most of the search's I did pulled up rb25's I don't feel quite so useless now!

[Don Dada]

Yea...26 ecus do not suffer from r&r so you can rule that out

As said before coil packs will most likely be youre problem or the ignitor

Your coppers at .8 will be good to go...just keep the boost down until you get them coil packs sorted

[portaz]

So here's another question after reading the coilpack thread I'm still not sure, should I buy yellow jackets at $390 or splitfire di at roughly $600? I don't mind spending the money if they are better but the two year warrantee from yj is appealing

[portaz]

So I ended up getting splitfires for $570 regapped the copper plugs to 1.0mm changed the fuel pump and redid timing which was only 15degrees, feels smoother and there is no miss and on part throttle is less rough and doesn't pop anymore when I back off so hopefully that's problem solved , thanks guys for all the input much appreciated

Scott

zil13r