Jump to content
SAU Community

Recommended Posts

hi guys got a drama ive been having for a few weeks and need some advice so here goes...

I have a rb30et fairly worked, i had the engine in another car until my brother crashed it for me.

Now i had a mate install all my running gear into another vl and mounted my coils in a different spot, this is the only difference from my other car.

I had the car defect almost instantly when it got onto the road so it sat in my shed for around 6 months, modifying it for my engineers cert. It was started regularly still.

I have finally got the car legally road registered and now i keep blowing the plugs!! :)

I thought it was just way out of tune so i took it to my tuner. He dynoed it for me and he said it read as everything was fine. That day i drove it home and replaced my plugs. 4 days later they fouled up again, not all 6 this time just the back 3 (4,5,6). First 3 were fine so i replaced them again thinking they may have been faulty.

1 day since replacing them i have blown them again!!

Compression reads around 125psi over all 6 cylinders. My tuner said that is about right due to my setup and cam.

My tuner is well known for tuning microtech's aswell!!

I just dont understand what it could be!!

Any help will be appreciated

Thanks in advance...

Kris

Link to comment
https://www.sau.com.au/forums/topic/169750-fouling-plugs-on-my-rb30/
Share on other sites

ok. well theres some reason for it. what sort of microtech is it? and was the wiring redone? it sounds like the ecu or the wiring for the injectors.

we fitted a brand knew haltech a while ago and had to send it back cos it was fouling no3 plug. new one. al fixed

blind elk - the car will run rich when it is cold but pretty well when it up to temp!!

tridentt - Nah crash was at the side toward the back witha guardrail. :thumbsup:

T04GTR - Microtech is a ltx12. it was a brand new loom when it was installed on the old car and i guess nothing has changed since unless something when wrong when getting installed. But wouldn't something ke that show up on the dyno??

NXTIME - Formally Rx Engineering turned to Blacktrack Performance

Guilt-toy - Its a custom plenum and not sure what reg but is new from autobahn. only one i could get at the time! and yeah the fuel pressure is reading good!

http://img263.imageshack.us/my.php?image=k...ncars021tx1.jpg

Heres the pic the some specs on the car,

NOTE: coils were mounted there but since have been moved onto the chaiss rail underneath the plenum after i encounted the problem because it was earthing on the firewall every now and than but not on the back 3 cylinders coils.

R31 Nismoid -

Engine management is a microtech ltx12. 6 individual bosch coils,. the head has been rebuilt with a stage 3 cam, good port and polish, new valve springs, lifters etc. The bottom end has standard rods, arias forged pistons (20 thou), not sure about rings thou (which is what im thinking but hopefully not), Turbo is a t04 highmounted, custom plenum and fuel reg, 550cc injecters (RX7), 450hp external pump.

Thats all i can think of at the moment, if u require any more infom just ask. thanks for ur help so far!!

Also the car has made 380hp on 14psi but on the last tune it made 340hp on 15psi ( i think the dyno was out but i have given you the info incase the problem may cause the loss in power)

Edited by FAT_3L

blind - they are standard plugs for a vlt gapped to .8mm. i have tried hotter plugs but they do the same just not as quick!!

rob82 - everytime i start the car after driving it for a while or at all at that, i need to give it a good rev so it will idle properly, otherwise it will stall or go very close but once i do that the car will run fine up until the plugs start to break down or i turn it off!!

Edited by FAT_3L

I would get the injectors looked at, at the best of times, rx7 injectors have a poor spray pattern not really suited to iston motors, yours may just be dirty. When you say they are fouled, do they come out smelling fueley or are they just black?oily?

Edited by Adriano

T04GTR - It just had a tune. if i turn the ignition on it may tell me the afr on the hand controller but im not to sure what the afr will be idleing at the moment as i am relocating the coils and havn't wired it up yet.

Adriano - it's only the back 3 plugs that are fouling up. the front 3 come out perfect while the back the are very fuely, dont think its oily

rob82 - everytime i start the car after driving it for a while or at all at that, i need to give it a good rev so it will idle properly, otherwise it will stall or go very close but once i do that the car will run fine up until the plugs start to break down or i turn it off!!

Sounds like it could be a number of problems :stupid:

- wiring

- tune

- posible leaking injectors

- ecu

- etc.

Take it to a another mechanic who can diagnose the fault and sort out the issues. On the net you will just get a whole heap of "maybe's" but no real solution.

Not being rude/smart/etc., but why post up on SAU, when there are SOOOOOOOO many VL / Commodore forums that have better experience/knowledge on the RB30et. Even the R31 forum would likely know more and be of greater assistance. :laugh:

because here i have actually recieved some help off people that offer there experience and knowledge. i never even know of the r31 forum but will try there.

as for a machanic most of them here talk crap just to get your money and don't fix the actual problem, and i can't drive it at the moment anyway because i havn't finished wiring my coils!!

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

    • Back again. I returned to Japan in Jul/Aug to spend time with the car on my birthday and remind myself what all the sacrifice and compromise is for. It happened to line up with the monthly morning meet in Okutama, which I have been wanting to go to for a long time. It's a unique event at a unique spot with really rare, interesting, and quirky cars. It's where all the oldheads and OGs gather. The nighttime scene at DKF certainly has its place and should be experienced if you're into cars, but there's too much bad attention and negativity around it now. IMO the better time is Sunday morning at DKF or Okutama; it's more chill and relaxed. I'm glad I was finally able to go, but not sure it's worth the drive from all the way from Nagoya immediately the day before, unless I was already staying in Tokyo for the days right before the meet, because you have to wake up quite early to make it in time. Funnily enough though I didn't drive the car all that much this trip because it was just too damn hot. While there were zero issues and running temps were nominal and the A/C was strong, RBs already run crazy hot as it is. Sure, it took it all like a champ but something about driving these cars in the ridiculous heat/humidity bothers me and makes me feel like I'm asking too much of it. I'm just me being weird and treating the car like a living thing with feelings; I'm mechanically sympathetic to a fault. Instead I was mainly driving something else around - a KX4(silver) 2001 X-Trail GT, that I acquired in May. There's a few different flavors to choose from with Xs, but visually it's the Nissan version of the Honda CR-V. Mechanically it's a whole different story as this, being the top-trim GT, has an SR20VET mated to a four speed auto and full-time AWD! It was a very affordable buy in exceptional condition inside and out, with very low mileage...only 48k kms. Most likely it was owned by an older person who kept it garaged and well-maintained, so I'm really happy with how it all worked out. It literally needs zero attention at the moment, albeit except for some minor visual touch-ups. I wanted something quirky, interesting, and practical and for sure it handily delivers on all three of those aspects. I was immediately able to utilize the cargo and passenger capacity to it's full extent. It's a lot of fun to drive and is quite punchy through 1st and 2nd. It's very unassuming -in the twisty bits it's a lot more composed than one would think at a glance- and it'll be even better once I get better tires on it(yes, it's an SUV but still a little boat-y for my liking). So...now I have two golden-era Nissans in silver. One sports car and one that does everything else; the perfect two-car solution I think👍 The rest of the trip...I was able to turn my stressed brain off and enjoy it, although I didn't quite get to do as much as I thought. I did some interesting things, met some interesting people, and happened into some interesting situations however, that's all for another post though only if people really want to know. Project-wise, I went back to Mine's again to discuss more plans and am hoping to wrap that up real soon; keep watching this space if that interests you. Additionally, while working in the tormenting sweatbox that is the warehouse, I was able to organize most of the myriad of parts that my friend is storing for me along with the cars, and the 34 has a nice little spot carved out for it: And since it can get so damn hot in there, that made it all the more easy to remove all the damn gauges that have mostly been an eyesore all this time. Huzzah. I was standing there looking at the car and said 'f**k it'. The heat basically makes the adhesive backing on the gauge mounts more pliable to work with, so it was far less stressful getting this done. I didn't fully clean it up or chase the wiring though; that will happen once I have the car in closer possession. Another major reason to remove all that stuff is to give people less reasons to get in my car and steal s**t while it's being exported/imported when/if the time comes, which leads us to my next point... ...and that is even though it's time in Japan is technically almost up since it's a November car and the X would be coming in March, I'm still not entirely sure where my life and career is headed; I don't really know what the future looks like and where I'm going to end up. I feel there's a great deal of uncertainty with me and as a result of that, it feels like I'm at a crossroads moreso now than any point in my life thus far and there are some choices I need to make. Yes, I've had some years to consider things and prepare myself, however too much has happened in that time to maintain confidence and everything feels so up in the air; tenuous one might say. Simply put, there's just too much nonsense going on right now from multiple vectors. Admittedly, I'm struggling to stay in the game and keep my eyes on the prize. So much so in fact, that very recently I came the closest I ever have before to calling it quits outright; selling everything and moving on and not looking back. The astute among you will pick up on key subtext within this paragraph. In the meantime I've still managed to slowly acquire some final bits for the car, but it feels nice knowing there's not much left to get and I'm almost across that finish line; I have almost everything I'll ever want for my interpretation and expression on what it is I think an R34 should be. 'til later.
    • Thanks for that, hadn’t used my brain enough to think about that. 
    • Also playing with fire if they start to flow more air down low than what the stock twins can. It's not even up top you need to worry, it can be at 3000rpm and part throttle and it's getting way more flow than it should.
    • Any G40/1000 or G40/1250 results out there?  
    • You still want a proper tune on the stock ECU though. Stock tune + stock ECU with GT-SS/-9s is probably playing with fire if you're running more than stock airflow/power.
×
×
  • Create New...