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Location:
Sydney
Registered:
May 2002
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1J fouling plugs
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Tue, 19 November 2002 10:22
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One for the 1J gurus (Celicamad and Newcastle mates  )
OK the 1Js had a bit of work and along the way the spark plug fouling has gone from bad to worse. It's running 1bar and pushing 200rwkw but I can't get plugs to last more than 5000ks without surging, misfiring, backfiring towards the 5000k mark.
Got rid of platinums real quick, went colder plugs, reduced the gap etc - now running NGK BKR7E with 0.7mm gap, they're cheap and last the longest of any of the plugs so far but still won't last until the 5000km service interval.
I've removed the cover to cool the coils, swpped out for spare coilpacks and ignitor with no improvement.
Apart from going for a CDI unit like a HKS Twin Spark DLI or full aftermarket, what are my options based on the stock ignition? Anyone tried R32 GTR Coil packs as suggested by a Sydney workshop?
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Location:
Wollongong
Registered:
May 2002
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Re: 1J fouling plugs
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Tue, 19 November 2002 13:18
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Colder plugs foul easier than warm/hot plugs, and the 1J was meant to operate as a 'hot' engine. Go back to heat range 6 (BKR6E8 maybe) and see if it gets any better.
Running too rich also makes them foul quickly... how is the S-AFC going ? Tested AFR lately ? Could be an issue there perhaps ?
I've got a set of BKR7E8 on my shelf about to go into mine. BKR6E8 seemed to cause misfiring from about 1000-5000km of use, and has disappeared since then. I've seen plugs get better with age. Just one of those weird things. I'll see how my 7 series plugs work out and we can compare.
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Location:
Sydney
Registered:
May 2002
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Re: 1J fouling plugs
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Tue, 19 November 2002 13:29
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Simon
Been there with both those plugs. The colder ones used to miss at high load and hotter ones just about everywhere in the rev range - even idle was popping. AFR is still about 12.1 .
The change with age may be the ECU learning with those plugs and compensating.
I'm just about convinced that we need to look beyond the plugs as just about every modded 1J has fouling problems. The stuff King_J said about the 1J coilpacks seems pretty spot on, they just can't hack it when the boost and power is up.
At this rate, I'm gonna wear out the plug seats in the head
Thanks for your feedback and I'd be very interested in how your engine fares with the BKR7E8's.
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Registered:
May 2002
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Re: 1J fouling plugs
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Tue, 19 November 2002 13:46
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Try what I did and put in HKS twinspark items direct from japan (code at home if you need it), they have a very slim stem and require less potential to break into a twin spark, you can run more gap (ie much bigger igniter) and they have been in there for 20, 000km's and look like new. And before you say..... yes I'm running 15psi, however I have made my own form of adjustable bleeder valve that is on the MAP sensor line (yes.... dont panic). It stretches the MAP out on positive boost ONLY as it is a one way bleeder valve. It's surprisingly effective, and you can really feel a good kick at 3000rpm when boost gets up to 5psi and significantly leans out the fuel. Sometimes I worry that it is too lean as I get a slight dry burn smell at long stints of full boost, however I have never had detonation (and yes I've had a datto 1600 so I know what that is) and the plugs seem to be perfectly clean and show a good burn coulour. My exhaust has also gone from jet black soot to a dark gray powdery layer. (not white gray-~~bad!)
I have never dyno'd the car (Type R JZA70) but I pull 5.6-5.8 0-100 consistantly (with a perfect launch at 5.3secs)and normally a 13.5 - 13.7 quarter, with usually a very nervous launch in a manual loosing at least 0.5secs. Do the math from there and I'm about 200kW at the wheels.
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Location:
Wollongong
Registered:
May 2002
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Re: 1J fouling plugs
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Tue, 19 November 2002 15:38
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I've also got a set of SplitFire triple platinums here as well that I'm going to try out. I know they are platinums blah blah blah, but they fared quite well in a test I read, and were the cheapest platinum plug at the time.
Time will tell with these... I might run them at dyno day and see how I go. If I get kilowatt fever again, a new set of BKR6E will be in there ready for the power run!
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Re: 1J fouling plugs
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Wed, 20 November 2002 00:44
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I have had my bkr6e's in since the last dyno day, they were fresh for that run.
I have not yet had a missfire (touch wood) so i am gunna leave them and see if I am able to make it to the next dyno day b4 I replace them.
They were shocking b4 I changed them last only 2000 k's old.
the new set is over 6000 k's
only mods since then is the twin pipes + exhaust... (insert spooky music )....
could it be another magical twin pipe mystery ??
i think not, just a fluke, though my a/fs change a fair bit after the twin pipes. leaner.
1jwonder, sounds like our cars are just about lineball, you quote almost identical times to me and I would claim 200rwkw also.
an auto with 221 rwkw has pulled 4's and flat 13's.
Thats where i'm headed
Matt
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Location:
nth ringwood, Victoria
Registered:
August 2002
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Re: 1J fouling plugs
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Wed, 20 November 2002 00:49
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what fuel are you using stay away from optimax as that fouls up plugs real quick ,use mobil in stead
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Registered:
May 2002
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Re: 1J fouling plugs
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Wed, 20 November 2002 03:50
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YoJimbo...... sounds good. I dont think I'll be happy intil I have a good solid 300rwkW under the belt (500BHP). Times dont bother me that much, just GTR's, HSV 300's and M5's, ohhh... and pesky 600cc motorbikes, wouldnt mind having a crack at them too.
Guess what.! My high tech bleeder valve lost it's seal this morning and it ran even harder for a short stint, probably at an unsafe lean level so I ripped it out to be safer. How bad is backfiring for turbos? if at all?
ps... paranoid here, but what does a chipped turbine sound like, seems to sound more like a blowing air pitch (lower than the whine) now. Hard to describe, closest sound I can think of is those dodgy whistle lollies when they start to stop working and sound more like blowing air.
Anyone??
Pete
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Re: 1J fouling plugs
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Wed, 20 November 2002 04:04
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Yeha i'd love 300 rwkw, butit wont happen without a big single
I'm trying for 250 rwkw with the next years mods, stock turbo chassis.
Times are just a good comparison.
I wanna run a 12 at the creek on street tyres and tehn i'll be happy.
Heres hoping 250 rwkw will be enough
Matt
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Location:
newcastle
Registered:
June 2002
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Location:
Newcastle
Registered:
May 2002
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Re: 1J fouling plugs
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Wed, 20 November 2002 15:40
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My car has the same problem. Starting to shit me really 
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Registered:
May 2002
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Re: 1J fouling plugs
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Thu, 21 November 2002 04:29
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Yes, I know... it's risky.
What I have done is adjust the map so that it is just outside 15psi before it cuts. We know there is enough fuel in the stock system for 1 BAR, and given that the map is juuuuust stretched enough, I have assumed that the mixtures are safe.
Yes a dyno is a good idea....finding time... not money.
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Location:
newcastle
Registered:
June 2002
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Re: 1J fouling plugs
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Thu, 21 November 2002 11:01
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zorro i think your problem is your intercooler isnt big enough 
NB his car has the biggest intercooler ive EVER seen on a 1j
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Location:
newcastle
Registered:
June 2002
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Re: 1J fouling plugs
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Thu, 21 November 2002 11:08
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i might also add that 1jz run really rich all the time .and the
bkr6e's have proven good for at least 10,000 KLMS but i havnt seen really good long term results
The real cure is to get those AF ratio's a bit leaner
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Location:
UK
Registered:
May 2002
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Location:
North Sydney
Registered:
May 2002
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Re: 1J fouling plugs
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Fri, 22 November 2002 06:21
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Optimax has an upper cylinder lubricant in it that's why alot of you guys are getting fouled plugs and dont like the opti. It's an added oil to drift down and slowly lubricate the bore.
My boss bought a brand new two stroke, put optimax and oil in it, rode 5km's into the bush, it fouled up big time and had to push it all the way home!! Stupid boy! Hehehe
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