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Merli, goddamit, I was keeping them a secret:(:D

Dean, you could buy the D Jetro, and I will swap you:)

Emre, that is the top feed version of http://www.ap-engineering.co.jp/el/inj_side.htm which states the difference to be 0.06 in my case. I will give it a go again with more than I wound in last time and see how it goes, cheers.

mist, how do you check AAC valve? I dont have a manual. I have pulled it off and cleaned it, and its seems to be in good condition, but it would be nice to run a check.

Emre, I ended up adding around 0.30ms extra in the injectors, and still didnt get it to work quite right, but throtle response is improved:) cheers.

RNS11Z, definately not tps, I have already checked the voltages and its all good - thanks for the suggestion none the less.

I fitted some new plugs, as it was taking longer to start on the cold morning, so I thought I would try some ngk 7s (had 8s). I think I found the problem - the old plugs were gapped between 0.5 down to 0.3mm! the 0.3 was in number 6 and was pretty carboned up. The guys who put them in didnt gap them, which is fair enough as they are supposed to be pre-gapped - but it was pretty obvious to me as soon as I started pulling them the gaps were way to small.

thanks for all the help so far.

WOW... 0.5 to 0.3mm in the 8s... How much power are you running...?

I don't think any plug in the market comes pre-gapped to those measurements.

From memory. you are running around 290rwkw, 7s gapped at 0.7mm would be a perfect choice IMO.

Increasing cylinder pressures is the best way to keep your plugs in good shape. Give the car a spirited drive around the block regularly for this reason alone. If you find that you are tootling around to work and back all the time, even the 7s will start fouling quickly.

Emre, I've been running 7s for the last 9 months, and they havent even been close to fouling, and I do city driving only really...

What am i supposed to make of this post.

I wasn't suggesting you can't use 7s in city driving. I have been running 7s for 3 years and they haven't fouled yet.

Here is the point : If you get into the habit of getting to work and back like Miss Daisy and keep your car off boost, colder plugs will start fouling. Giving it WOT on regular basis will help keeping your plugs in good shape by clearing the fresh soot of.

making a bit over 300 rwkw, I was hesitant to run 8s, as I thought they may be a bit cold. OK in summer, but with the cooler weather, they dont seem to like it as much. They looked ok, except for 6 which as 0.3mm - that was fully black. And I agree completely about giving the plugs a good clean from time to time;)

  • 2 weeks later...

Just checked on a mates car who has 550cc sard in an S14, the injector lag was +0.08. This car was set up by a jap mechanic and runs well, also has the same cams as mine.

I had to dump in a fair bit of fuel, but now the car is idleing perfect under EL and throttle response is crisper than when I had +0.38 ms.

Thanks heaps for all your help:)

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