Jump to content
SAU Community

Recommended Posts

Hi Fellas,

I was recently having a few issues with my car with low power output. However, I change the spark plugs (Put NGK platinum ones) and the power was back up (wheels spings in 3rd gear :down: )

Anyway, 3 weeks of driving, the power is back down, had a look at the spark plugs, and they are fouled, yet again...

I cant keep forking out $150 every 3 weeks to change the spark plugs, so what do you guys suggest?

I have a built rb25/30 block, forged pistons, rods, the whole shabang. GT35r turbo, Autronic SM4.

Went to the tuner last week, AFR were perfect throughout so I am not too sure whats causing the fouling? Will I need to get hotter plugs? I am currently running the NGK PFR6G-11 5555 at 0.8 gap.

Not sure what heat rating these are.

Any suggestions are welcome.

CHeers fellas.

Link to comment
https://www.sau.com.au/forums/topic/308303-spark-plugs-keep-fouling-why/
Share on other sites

Do you have any rich spots in your tune, even small events? i.e. just coming onto boost, or injection cut on deceleration?

Are you getting any misfires, especially on boost?

as i understand it, plugs foul cos of rich condition and/or lack of spark (not igniting the mix)

maybe something to do with the gap?

with 22psi (going by whats in your sig) you might need a colder plug. most people run 6s on stock engines/lower boost.

what did your tuner have to say?

good luck bro

what kind of driving do you do?

constant short trips (5mins or so to work i the morning) when the car is cold and not hitting boost can foul plugs pretty easily...

if this is the case take it out for a nice longer drive and boost it a bit... it should clear up.

otherwise, look at your tune again... most likely too much fuel somewhere.

plugs to use would be bcpr7es @ 0.8

what kind of driving do you do?

constant short trips (5mins or so to work i the morning) when the car is cold and not hitting boost can foul plugs pretty easily...

if this is the case take it out for a nice longer drive and boost it a bit... it should clear up.

otherwise, look at your tune again... most likely too much fuel somewhere.

plugs to use would be bcpr7es @ 0.8

Pretty much 5-10 min drives to work and back each day, car doesn't even get a chance to fully warm up.

As for these bcpr7es, what heat range should I get?

How long do these spark plugs generally last?

I wouldn't mind changing them once a month, anymore than that gets annoying....

Thanks for the input :P

Pretty much 5-10 min drives to work and back each day, car doesn't even get a chance to fully warm up.

As for these bcpr7es, what heat range should I get?

How long do these spark plugs generally last?

I wouldn't mind changing them once a month, anymore than that gets annoying....

Thanks for the input :P

Theres your answer, you need to trim the temp compensation.

bcpr7es, usually 7-12 months depending on driving Kms.

the 7 in the number IS the heat range

mine last 20,000ish with 300rwkw

if your car is always on cold start / idle then try giving it a good run and boosting it for a while and see if the plugs clean up a bit.

if they do then you know which part of your tune has too much fuel

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

    • That R31 was so cool. Only did Orange Park once. Scared the hell out of me.
    • Selling my TE37SLs since I've switched to smaller wheels.  They're for sale in Japan but it's pretty simple to send them overseas; USA excluded, since JPPost isn't sending there at the moment. Specs Front: 18x9.5j +22 5x114 Rear: 18x10j +20 5x114 Price: 320,000 JPY/ 3,285 AUD (current FX rate) Condition: a few scratches here and there, no bends, distortions or cracks.  Tires will not be included for international buyers, I'll get them dismounted before shipping. They're currently listed on yahoo auction and will be shipped in Japan with the tires if they sell here. Shipping costs to Aus: EMS (1-2 weeks): AUD 1,175 (current FX rate) Sea (2 months): AUD 460  (current FX rate)
    • The alloy coolant reservoir has a sight glass, so as long as I can see coolant in the sight glass it's GTG, as for PS, it isn't anything catastrophic if it gets low, and as it hasn't lost a drop since I have owned the car I cannot see it being an issue, even after putting the "big block" 2.5 in....LOL The only time it gets slightly messy is at oil changes, as the oil filter sits above the frame, and I need to use a plastic bottle with its bottom cut off to catch the flow when loosening the filter
    • Good on you for taking on the job, but it is a big one. Even if you have bolt on manifold and turbo, you will need: Post throttle pressure source to boost controller to wastegate (and FPR, and ECU/MAP sensor) Pre throttle pressure source to top of BOV(s) Oil feed - you can take that from the standard port in the middle of the block Oil return to block under the turbo - this is much trickier than it seems to route a decent/wide pipe past the manifold. You really can't use rubber hose because it is way too hot there, and also the oil out of the turbo core is a bit frothy so it needs to have a decent diameter Water feed - you can take that from the standard port in the rear of the block. Water return - mine runs to a T into the heater box return, just make sure you don't create a high point making bleeding hard. All of those lines should use 200 series style teflon braided hose with heat shielding because everything needs to be routed past the manifold. Also a turbo beanie is a really good idea to minimise the chance of the car catching fire (under bonnet lining in particular) You also need to decide a cam cover breathing solution as well, will you vent externally via a catch can (probably illegal) or return to the intake (plumbing required and can oil up everything over time) Keep in mind the intake and exhaust piping in the engine bay will be custom so you either need to be able to fab ally and steel or have someone you can get a car that isn't running to. Get the wideband fitting welded into the dump pipe at the same time. Also, just my opinion, a screamer pipe attracts attention and doesn't add power, I'd plumb it back if you want to be allowed to keep the car on the road. BTW do you know anything about how healthy the motor is, and what power you are targeting? Doubling or tripling the factory power on an unknown motor is a little risky. Also fuel system will need some attention (pumps, high current hanger, direct power and earth feed, injectors etc)
×
×
  • Create New...