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What Iridiums for RB25?
Posted: Sat Jun 14, 2014 1:37 pm
by Trance101
Hi guys,
I have a RB25 with GT35R turbo. I'm getting a bad misfire when coming onto boost. It seems like it's spark related. I want to eliminate the spark plugs so I want to get a set of Iridiums.
What are the best to run with an RB and where can I get some?
Thanks,
Ryan
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 2:16 pm
by rat
Dude I would stick with the coppers. Iridiums foul very easy and if you are still running the dictator with its batch firing with your 750cc you will be fouling your plugs on idle and cruzing. Bcpr7es gapped to 0.8 will work for high boost well. I ran 1.2 bar on my old setup. Under 1 bar run 6's
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 4:13 pm
by Trance101
Hey man,
I've run both BCPR6's and BCPR7's same issue. I think it might be blowing out the spark. Changing for brand new coppers doesn't make the problem go away. I've also swapped out each coil in turn and no dice. Not sure what else it could be...
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 5:40 pm
by Skylinefreak
Have you tried making the plug gap smaller?
Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 5:41 pm
by rat
Saw a vid on youtube about testing rb coils. Will try find it for you.
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 8:36 pm
by Drillergy
Definitely sounds like coils.
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 8:43 pm
by SonOfAnarchy ZA
Agree or possibly a bad ground
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 8:43 pm
by rat
Dwell time on coils
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 8:51 pm
by Trance101
I've gapped the plugs to .8 and it made no difference.
With the coils I previously got a few new ones from rat and I've tried swapping out my coils in a number of different combinations and still no change.
Rat, I'm not sure what the dwell time is, I'l have to check the 'tator, but what should it be at?
Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 9:22 pm
by rat
Stock is just under 2ms but dont think that works on the tator. Iirc I was running 4ms at first but that killed my coils. 2.5 -3ms is what I settled at after a visit from barry
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Re: What Iridiums for RB25?
Posted: Sat Jun 14, 2014 9:24 pm
by rat
https://www.youtube.com/watch?v=Qirx_G4x5i0
try this. RB26 and RB25 S1 are the same coils
To everyone else this works with the CA coils as well.
Re: What Iridiums for RB25?
Posted: Tue Jun 17, 2014 3:40 pm
by BigKriss
Does the standard coil have a resistor in the suppressor that clips onto the plug underneath the coil ?
If so, run a non resistor plug. ie: Bcp6es or similar.
The R denotes a resistor plug and you shouldn't run two resistive items in series.
If it does not I have just wasted a few minutes of my life on drivel..