Best Plugs for Series1 RB25DET?

[HotRB240]

A friend of mine told me cheap copper plugs are actually the best to use; any thoughts?

I'm going to be putting new plugs in this weekend, so I need to know which ones I should pick up. Can anyone tell me a brand and type?

And the gap is 1-1.2 , right?

Thanks

[StricNyne]

i ran z32 tt plugs, i had some issues with too large of a gap and i blew spark out but i go with coppers baby !!

[HotRB240]

Ok, I called one of the moderators from here yesterday and he told me to put in the NGK BKR6E-11's since I couldn't find the Iridium ones. Incidentally, there were iridium plugs in the car-I have them in a bag to show you when I come out there again. Car is still running the same. Well, honestly, considering I've never done that before I'm surprised the car even started-lol! So I'm still counting it a success. The wires though...They are all cracked and frayed and what not...I really want to replace them. I was so worried the car wouldn't start because of a bad wire or something.

[StricNyne]

ya original install had the ignitor wiring twisted and taped we will solder it and shrink wrap it,

[HotRB240]

Well, the good thing is that we have now eliminated yet another possible cause for its stumbling. Not too many things left really. Now my biggest concerns are maf and timing. Hey, I was reading thru some of your older posts: I had no idea the ordeal you went thru getting your motor mounts. How did you end up getting them? Did you drive out there, or did they eventually just ship them to you?

[rb25drag]

My car run like crap stumbled on take offs, and wanted to cut out around 4500, on NGK plugs, Expensive Iridiums, I personally think they suck and Ill never go back to them, I changed to Acdelco #4's WOW!!! its a totally different car, Then I bumped my timing up and it runs like a champ now. No studdering and it runs true through 6500rpm. Just my experience with NGK, My motor hated them. Might not be the case with all.

[HotRB240]

Yeah, Stricnynel0s told me he advanced his timing by 3* and it made a big difference. Mine is running a little too rough for me to think that is the whole problem, but it's worth trying-that is once I figure out how to do it. Is it difficult to do?

[leesredgt]

are those #4's already gap't if not what is the proper gap for it? Is that the whole part number or is it#4------,my rb is still cuttin out and runnin like crap.

[rb25drag]

Ya thats the whole part #.

I gapped mine .08mm

There not pre- gapped you will have to gap them.

They are about a 1/4 of the price of the NGK's too.

[leesredgt]

rb25drag,

when you bumped ur timing up with those plugs was ur timing 15*? i just want to make sure before i do b/c even the manuel says its 15* i thought ive read that its actually 20* is that right or am i just thinking of somthing diffrent b/c they were saying the car ran better at 20* than 15*.

[Joe]

set your base to 15

do not adjust it unless you have a wideband.

and the best plug is a basic old NGK copper. NGK BCPR6ES. if your car sees heavy abuse (50%+ track driving) use the BCPR7ES. its 1 heat range colder.

[rb25drag]

set your base to 15

do not adjust it unless you have a wideband.

and the best plug is a basic old NGK copper. NGK BCPR6ES. if your car sees heavy abuse (50%+ track driving) use the BCPR7ES. its 1 heat range colder.

Yes the base timing is 15, I bumped mine to 20 and it runs perfect the only problem I have is the ECU keeps retarding the timing on me! I gotta get the PFC. Every time I check my timing after a 1/8 mile pass its setting on 0. Me and a nissan tech have pretty much narrowed mine down to ECU problems. We have attempted everything else.

Kamin- I have tried those plugs, But I cannot get it to not cut out at 4500rpm's on 8lbs of boost. The AFR is 11.1 which is not lean nor rich but it acts like a detonation. I put in the ACDelco didn't change anything on my tune and I can go all the way to 6500 on 10lbs of boost fine reading 11.5 on the AFR! I just think my motor don't like those plugs. Just my experience tho!

These motors seem to be extremely timing and spark plug sensitive.

[leesredgt]

okay ill leave the timing alone. are those plugs kamins talking about pregapped or should they be gapped to .08 also?another question i took off the CAS b/c i was gonna get my covers powder coated but i ran out of money.dont worry i marked it before i took it off.i havent be able to get a timing gun b/c i havent had the money but im hoping to get one for christmas ,is it all right to drive it till then?i pretty sure its back as it was but im starting to wonder if its causeing my car to cut out?its gotting better now that i wiped the ecu coolant sensor off and its not dying but it still cuts out but in a way when my 3000gt needed new plugs it would cut out/bog down through out the whole rpm range this seems to be at only 3000-3500 rpm and it seems like it isnt building boost but stupid me i never think to look at the gauge b/c im trying to feel what the car is doing so far ive only drove it 3 times,plus i still dont have an exhuast on it just the 3 inch down pipe so i cant really think while im driving anyways.sorry for the paragraph.lol

[duece.four.oh.sx]

quik confusing question is a colder ngk plug better (BCPR6ES-11 ) or just a regular one (BKR5E-11 )........thanks

[Darius]

Yes the base timing is 15, I bumped mine to 20 and it runs perfect the only problem I have is the ECU keeps retarding the timing on me! I gotta get the PFC. Every time I check my timing after a 1/8 mile pass its setting on 0. Me and a nissan tech have pretty much narrowed mine down to ECU problems. We have attempted everything else.

A little off topic but there may be a reason your ECU is pulling timing after an 1/8th mile run. What are your coolant temps after the run? If the coolant temp is above a certain degree, the ECU will pull some timing. Increase the temp above another setpoint and the ECU will pull more timing. I do not know how the stock ECU is programmed to react, but it might be in the FSM?? Not sure. The PFC is setup the same way except those temp vs. IGN setpoints are adjustable.

I am no plug expert, but I have read somewhere that a rule of thumb is use a step colder plug for each additional 50hp you're running. Has anyone else heard such a thing?

[rb25drag]

When I set my timing I set it when Im @ 160-170 degree's, After a 1/8 mile pass its about 175-185 according to how long I stayed in the staging lanes and based on if I decide to do a pro stock burnout or not (been testing diff tires and tire temps for launching). How do I get it not to pull timing? I hate having to re-check it after every pass.

I have heard of the 50hp theory, but im no plug expert either, I have heard a few other theories too!

Thanks, Scott

[Darius]

The base temp value for normal operating temp is 80C or 173F. If you are setting your timing at a temperature lower than that, the ECU may still be retarding the timing a few degrees. Not 15 degrees, but maybe 5 or so. I'm just going by what the default values are on my PFC for temp vs. IGN.

What is weird is that if you set your base timing when the engine is cold, it will be advanced when the engine is warmed up. I'm really baffled by why it is retarding so much on you??

[rb25drag]

YA this ECU is taking me for loops, I have a local Nissan tech thats been working with me on it and he's confused about it too, So we think the ECU is corrup in some way. Im getting the PFC soon so hopefully it will cure all my problems.