About To Fork Out For Splitfires Rb25det

[turbs33]

Hey all,

I am about to buy new coil packs and before parting with my hard earned cash would like any feedback from people who have gone though the process of identifing ignition issues on their rb25's

Ok this is the current situation.

mods = pod / full exhaust / fmic / upped boost (using turbo tech)

R33 gts25t series 1

Previously :-

running 12.5 psi on stock ecu , stock turbo, and slight correction with safc.. Used copper plugs bcp6re (copper .8mm heat range 6) and the car pulled all the way to redline with no worries, no R&R no missing coughing farting nothing.. ran sweet, no black smoke on boost or gear changes..

Current :-

On the weekend, replaced 20000 km old copper plugs with new iridium plugs (.8mm heat range 6) , removed safc and wound boost back to 8psi. get a little bit of missing and hesitation no under load..

please note : the safc was never 'tuned' only had -1 % correction from 2500 rpm to red line which effectively bought me under the r&r threshold and allowed smooth power delivery across the rev range @ 12.5psi.. Well thats what I was thinking at the time..

Considering when I had the coppers in everything was sweet and now the motor runs smooth but missing under load on 8psi, is it wise to just spend the money on the coil packs and be done with it? Or revert to coppers.. The rationale behind switching from copper to iridiums was to increase the service interval on the plugs.

What do others think? Coils or cheap ass plugs again?

Edited April 22, 2008 by turbs33

[dangerman4]

you will find a lot of cars getting up past 350 rwkws with the standard coils, mine included.

generally my rule of thumb is! if you have a problem? what was the last thing that i touched that was ascociated with the problem?

look at that first as its more then likely the reason for the issue.

there could be multiple issues with your car from the wiring where the safc was removed to plug gap, plug choice air leaks etc.

dont just fork out $$$$ for coils if yours were working perfectly before you touched it.

mine handle 24psi daily with no issues at all.

[R31Nismoid]

Yeah mine went over 350rwkw too.

I would have put coppers back in there. Increasing service intervals doesnt generally work.

Iridi's never last thier cost in terms of km's ive found. They are usually in need of replacement before their 100k

Did you gap the plugs yourself? You could have damaged the tip (they dont like being touched really)

I'd go back to coppers, the exact same plug you had before and see

[tridentt150v]

If you've only got 8psi of boost now, why are you still gapping the plugs to .8mm

[turbs33]

Trident, I wound boost back as i was missing so figured id drop boost to try and aleviate the problem.

The iridiums i put in were gapped .8mm standard.. Cant remember the part number but its the one without the -11 on the end.

The coppers i pulled out looked really good for 20000k's actually looked like they could be re-gapped and last another 5-10k..

I will replace the irid's with the coppers i took out after checking the gaps and see if the car likes them better..

I spent some time down in the wiring loom ensure there were no shorts , exposed wires and the like when removing the safc... I am relatively confident the problem does not exist there. Though to my amazement there has been alot of wire hacking in there in the past, can see all the tape up wiring.. I will return there if coppers gapped right at 8psi cause me issues.

Thanks guys for the input, you have convinced me not to spend the moeny and to get off me ass and put the coppers back in...

[unique1]

the -11 on the end of the sparkplug name means 1.1mm plug gap so i dont know how they are 0.8mm? thats my understanding of the -11 on the plug name anyway, unless someone else can say otherwise?

[turbs33]

unique1 lol read the post i said the ones without the -11.. meaning i got .8 mm plugs..

andhow problem solved.. f^cking cracked plug.. there ya have it.. pays to check everything properally as its going in..

Also i notice that the bcp6es are a taller plug then the bkr6eix <- is this not the correct iridium for rb25?

the above mention coppers seat into the coils so much better due to their height..

I am going to stick with my coppers for now 5x bkr6eix for sale 50 bucks plus postage. any takers????? oh they done 29 km's

Edited April 22, 2008 by turbs33

[rev210]

Copper plugs FTW!

Standard coils are great when in working order. Leave them alone.

[turbs33]

will do

[Cjmartz2k]

Standard coils are great when in working order. Leave them alone.

x2 500rwhp @ 1.8 bar on stock coils. The only reason people see a diference going to splitfires is because thier old coils were dirty/busted and the splits are new. I did the dremel the inside trick and they were like new.

[nizmonut]

dont go paying pounds sterling. go to your local auto parts store.

buy the coil pack for a 3.8 litre v6 holden commodore engine

1 meter of 8 gauge wire

3 meters of 16 gauge wire

one diode with the capabilty to with stand 12 volt 100 amp's (ask the guy at dick smith's)

6 spade connectors to plug into the holden commodore coil pack

6 1 meter long bosch ignition leads

6 Ngk spark plugs with a .8 ml gap

then go to your local auto electrician and tell em you want a wasted spark system, and need the car back by lunch time.....

[R31Nismoid]

then you have unsightly coils requiring mounting somewhere

need to add leads as a consumable part

etc etc

[turbs33]

After my latest episode, it makes me wonder how many people actually need new coils or if the problem is something else..

wrong plug etc...

Can anyone comment on the iridium bkr6eix being the incorrrect plug for a series one r33? the top part of the plug just is not as long as the coppers i mentioned abaove and hence does nto seat as well into the actual coil...?

Anyhow I am sticking with the coppers.. Just curious.

Edited April 23, 2008 by turbs33

[geraus]

hey dude, i was going through the same problem! i purcashed a pack of iridiums! and my car was missing pass 4000RPM and was missing to redline... I had em on for about 4months and i got really angry and it took me that whole 4months through researching through the fourms and so i decided one day to go to Supercheap and buy these cheap spark copper plugs! i cant rememba which one it was.. but it totaled up to 24.90, they were pre gapped to .08mm and heat range was 6 i think? im not at home atm so yeh when im home i'l put up

[turbs33]

Yeah there the coppers i had been using and am now using again..

bcp6es i think .. heat range 6 and gapped at .8mm and never miss a beat..

But F'it i just left the coil cover off and that saved 5 mins on a plug change for the future.. beside once ya do it a few times it takes like 30 mins max if ya dont piss arround

[unique1]

sorrt turbs33 i didnt read it properly

anyway copper plugs are fine, im running 560rwhp without an issue, and have been above 600rwhp with them, i'd rather replace plugs more often than use the iridiums

[turbs33]

unique1, along with what u have just said and others in this thread i am convinced for my needs coppers as the way to go...

thank all that involved themselves in this thread