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Spark PLugs

DREMEN

By DREMEN,
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DREMEN Rising Star

DREMEN

Posted
Posted

I just got back from another dyno run (179kw @ wheels) :):D:D

But I have a miss :D:(

The tuner believes it is the spark plugs....

Which ones should I use?

He said something about 5 or 6.

What should they be gapped to?

Thanks for your time :P

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Guest Master of Disaster

Guest Master of Disaster

Posted
Posted

dude the power curve looks a bit too much like a roller coaster, did the dyno operator back off the throttle at about 115kms??!

You should be able to iron out all those dips! Doesnt look very linear! How does it drive?

I dunno about the heat ranges, but im using Iridiums, gapped to 0.8, which seems to be accepted as the ideal gap. (from a test done in a mag). My old plugs started missing heaps, i pulled them out and the gap was 1.1, which didnt work at all. 0.8 saw the return of smooth clean power.

Cheers, MASTER

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walkoau Mentor

walkoau

Posted
Posted

i use platinums 0.8 and never missed beat.

when ever you buy a set of plugs for ur car they should be pre-gapped to 1.1 but always regap them most ppl regap theres to 0.8mm

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DREMEN Rising Star

DREMEN

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Posted
Originally posted by Master of Disaster

dude the power curve looks a bit too much like a roller coaster, did the dyno operator back off the throttle at about 115kms??!

You should be able to iron out all those dips!  Doesnt look very linear!  How does it drive?

I dunno about the heat ranges, but im using Iridiums, gapped to 0.8, which seems to be accepted as the ideal gap. (from a test done in a mag).  My old plugs started missing heaps, i pulled them out and the gap was 1.1, which didnt work at all.  0.8 saw the return of smooth clean power.

Cheers, MASTER

That up and down is the "miss" hopefully just due to the spark plugs.... it seems to drive fine on the road....

I haven't replaced the spark plugs since I got the car from japan and therefore they haven't been regapped to run higher boost...

That is why the curve looks like a coke bottle :):P

Where do I buy good plugs from? I.e HKS or Iridiums?

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sileighty Grand Master

sileighty

Posted
Posted

could have a look on the net for some good sights that sell quality spark plugs. or go down to repco, autobarn, ect. tell what you got and shouldnt be a problem.

i am up for a change in timing belt and plugs and stuff. going to try some ones from ngk i think with 4 contacts. see how i go

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Zahos Mentor

Zahos

Posted
Posted

Iridiums and platinums do not offer any better spark over copper. In fact, the copper plugs are better conductors and offer a better spark. Only think is they dont last as long, which is a good thing on a tuned high performance car, as you would want new plugs at least every 20,000Km.

The Iridiums and platinums till have a copper core anyhow, but have a thin layer coating the core. They shouldn't be re-gapped b/c their tips can be easily scratched, thus turning them into $20 copper plugs as oppossed to $3 copper plugs.

Try some NGK copper plugs, they will work just as well, if not better for a fraction of the price.

The plug you need depends on your driving habbits....

If you drive like a grandma most of the time, NGK BCPR5E or (BCRP5E-11)

If you take it on the track, or thrash it quite often, go for the same in a 6 heat range, so BCPR6E (-11)

Whatever you end up getting, regap them to 0.7. Then make sure you tuner advances your timing to past the 20degree mark (as long as their is no knocking, if there is then he should retard the timing to a safe level). This should help make that power curve look a little more linear. You will never fully get rid of the problem unless you get aftermarket management, as it is an issue with your ignition timing curve on the stock ECU. Boost + stock ECU + VCT = miss at 5000 rpm!

Zahos

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Zahos Mentor

Zahos

Posted
Posted

for a larger turbo, a heat range of 7 is good, but for the satandard turbo, 5 is good, or 6 if u are around the 180kw mark. Anything less on an R33 with standard turbo, and you will definately see problems at the 5000rpm mark.

I had 7's in mine with 12psi boost, and for the 1st 2 weeks it was fine. After that they soon fouled easily, so I went down to 6. Because I drive it to work, and dont often thrash it, they fouled after a while too. I've had 5's in there for 3 months now, and I have had no issues...

In DREMEN's case I wouldn't go past a heat range of 6...

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