[randy]

Running stock turbos at 20psi what is the ideal spark plug gap one should have? And will it make a difference in performance having the gap lower?

 

[Lagtime]

The biggest gap that doesn't misfire.

Experiment.

 

[Guest]

Get the NGK 3330's and don't gap them, just put them in. They are ideal for stock twins.

 

[randy]

Is .030 too low?

 

[Guest]

No.

 

[randy]

Will it be OK if I was to use the stock platinum plugs which come with the tt or go for the NGK 3330's?

 

[Steve Jarvis]

I wouldn't reduce the gap on the stock plugs that much. You want to run as much gap as possible without misfiring. I would guess about .035 (maybe a little less).

Later, Steve

 

[randy]

Just Gapped my plugs at .030 man my car feels like a rocket compared to before. I had gaped it at .050 before the downpipe. After I installed the downpipe it was missing badly so I gapped down to .030 the idling is completely normal. The boost builds up real low at 2500rpm and the response is a lot quicker its great!! Planning to regap after boost mod to .026/

 

[Steve Jarvis]

There is no reason to go below .030. Anything lower can actually hurt power.

Later, Steve

 

[quick]

There is no reason to go below .030. Anything lower can actually hurt power.

Exactly. My old man told me an old hot-rodder trick is to gap plugs higher to increase power (of course not so high that you misfire).

 

[Rviscosi]

The stock plugs or 3330's at .030 seem to work well for me. I like the stock plugs slightly better though, same power and runs smoother at idle. Thay will also last a hell of a lot longer.

 

[randy]

Thanks!! I read from this HPF site that you can go as low as .027 ? Im quite happy with the .030gap so I guess will stay at that.

 

[Guest]

You don't need to go lower than .030 unless you are going to squeeze, Then you will need to go .028