Jump to content
SAU Community

Recommended Posts

Time for a service on my brothers R33, what oil and sparkplugs should we use and what is the gap best set at. I was thinking of using good old Mobile 1 to replace the $2 oil the importer would have put in it. It seems to have developed a slight intermitant stutter during heavy acceleration so changing the plugs would be a good start I recon.

Link to comment
https://www.sau.com.au/forums/topic/16296-oil-and-sparkplugs-for-rb25det/
Share on other sites

This must be the 1,000,000,000,000,000th time I have posted in re to spark plugs but I can't help myself.....

OK, when I bought my car, the guy I got it from put platinums (NGK platimun).... they took almost twice as long to foul as my coppers did. At 3 or 4 times the price, it doesn't seem worth it to me.

Then I put BCPR7ES, and the car felt great agin.... but they fouled VERY quickly on my car.... only mods were boost, cooler, cat back. It only took a few 1000 k's before the misfire at 5000rpm was getting worse.

Then I went for BCPR6E. Same as the 7's... felt great, but lasted a little longer before misfire got worse. However I would say the difference was negligable.

Then I went down one more to BCPR5E. These lasted me ages..... The misfire at 5000 rpm got considerably smaller than before. They worked a treat for me. So why the hell did I go back up to a heat range of 6???? Well I got a full turbo back xorst, and a SAFC, so I thought I should go 1 cooler, but it didn't help me.... :D

Overall, I have used a lot of different plugs, and my best experience was with NGK coppers: BCPR5E (oh, gapped at 0.75mm)

DennisRB30 - yeah i only got a 1psi increase, but it spikes to 10 occasionally. 9.5psi is a nice gain from 7 huh. maybe my gauge reads in the wrong place? coz the car has heaps more power after putting on the 3" pipe. my 33 is dead even with my mates 33 which has the same mods as mine but with the addition of a dsbc running 11psi on high....

-

Sorry Dennis, that wasn't me, it was Zahos. We use NGK BCPR7ES-11 gapped at 0.9 mm in the race GTST. When it starts missing I spend $18 and buy a new set. The road car gets PFR5A-11's gapped at 1 mm. I've not had any problems with this combo and they are cheap enough, so never bothered trying anything else.

Hope that helps.

Sorry for the mix up Zahos and Sydney kid. Anyway, the only ones I could find that matched any thing I was recommended were the same as BCPR5E (forgot the actual part number) but with a Y in the part number and are gapped to 1.1 mm instead of .8 The Y stands for a grooved electrode so I thought it wouldn't hurt (probably just a gymmick though). I gapped them to .9 and put them in. I found out what a prick it is to change plugs on a RB25DET!! I think the plugs that were in there were the platimum ones, the part number started with a P and the electrode tapered to a small point unlike a usual plug. They looked to be in perfect condition but were gapped to 1.1 which was probably causing the misfire not the plug itself. I was tempted to gap them down a bit and put them back, but I put the new ones in anyway because they were there.

I will post the part number of the plugs that came out and the plugs that I got when I have a look later on this week. We haven't has a chance to drive it yet since we are having a few probs with the stereo installation. But once the dash is back on, I will post the results of the new plugs. Hopefully the hesitation will be gone.

Originally posted by Sydneykid

The road car gets PFR5A-11's gapped at 1 mm.   I've not had any problems with this combo and they are cheap enough, so never bothered trying anything else.

Gapped at 1mm??? Gee thats pretty small....

Is that just a typo? If not, why such a small gap?

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Impossible to remove the housing while turbo is installed on the manifold on the engine. So I have to do it anyways. I plugged it so there will not be any debris in there. Will vacuum aswell 
    • would a r34 gtr hood line up with gt/gtt stock fenders? after latch, front bumper and hinges are swapped for gtr ones? or would the fenders be too low or high in relation to the hood surface? ( I believe seeing somewhere that gtr front fenders use some type of riser for the sides, but do not know how that relates to stock gt/gtt fenders.)    
    • You just need to remove the compressor housing, not the entire turbo. I would not be drilling and tapping anything with the housing still on anyways. 
    • So, I put my boat on a boat. First of all, I'm going to come out and say it. Why is Tasmania not considered a holy goal, an apex that all road-legal modified cars go to, to experience? This place is an absolute wonderland of titanic proportions. If people are already getting club runs for once in a lifetime 30 person cruises to Tassy then I've never seemed to see it. It is like someone replaced the entire place with an idyllic wonderland for cars, and all of the people living there with paid actors who are kind, humble, and friendly. Dear god. After doing a lap of almost all of the place I've found that it's a great way to find out all of the little things that the car isn't doing quite right and a great way to figure it all out. All in all, I drove for 4 hours a day for a week and nothing broke. I didn't even need to open the engine bay. This is by all means a great success, but it has left me with a list of things to potentially address. I also now have a 3D printed wheel fitment tool which annoyingly hasn't got any threads in it to actually assemble it. I might be able to tape it together to check the sizing I actually want to use, but it'll likely involving pulling the shocks out to properly measure travel at least at the front, and probably raise the car while I'm at it, at least in the rear. I scraped on quite a few things and I'm not sure how else to go about it. I was taking anything with a bump at what felt like 89 degree angles. And address those 10 other tasks. And wash the car. God damn it is dirty. And somehow, the weather was perfect the entire time - And because I was on the top of Mt Wellington it turns out it was very much about to freeze up there. I did something I typically never do and took some photos up there in what must have been -10 and the foggy felt like suspended ice, rather than mere fog. If you own a car in Australia, you owe it to yourself to do it.
    • Damn that was hilarious, and a bit embarrassing for skylines in general 😂 vintage car life ey. That R33 really stomped. Pretty entertaining stuff
×
×
  • Create New...