hks r50 plugs or NGK plugs running about 400 on the wheel?

what would you guys recomend im currently running HKS on all four but one or more as broken down and need replacing gutted

 

NGK B9EGV

http://www.sparkplugs.com/results_cr...9EGV&x=44&y=10

Requires a thin wall socket from Racing Beat or modified rotor housing.

 

there only heat range 9 tho, and wont last that long

 

You ask for a good plug for about 400whp, my answer is correct!
Next suggestion is B10EGV but they are a little cold for only street driving.

 

This guy knows what he is talking about, and there is not many people on this site I will vouch for like that.

 

I'm currently using the NGK Iridium BR10EIX in leading, stock 9s in trailing.

 

How much boost?

Making 400hp on 15psi versus 25psi makes a difference...


-Ted

 

The BR10EIX for all 4 have been working great for me and they are cheap.

Run it rich, cooler EGTs, more premix and any plugs (and motor) will take less abuse.

If I run a little lean plugs last 1 road tuning session, if I run my usual 10.8:1 the plus last ~10,000 miles.

 

ok not really the right thread but i will ask anyways i want to get some good plug and plug wires for my rx7 and it is an n/a and i only use it for the track.

 

I'm running 9's in all 4 it runs great, 800 idle with about 300+hp....when I go with a ecu, would anyone suggest running 10's or staying with 9's??