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Old 02-09-2006, 11:33 PM   #1
deathinacan
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Default Proper install on spark plugs on an 04 sti

I recently installed a new set of ngk spark plugs on my STi. Everything is running fine, but i noticed about a 5-10 hp drop on the dyno compared with my run before i changed the plugs.

i need to know what is the proper torque or spacing when you install them. they are a pain in the butt to install in the first place, but i'm going to install one step colder NGK's next month anyways.

Is there anything special i should know PRIOR to installing the plugs over again?

kory

pm me if anyone has some hard fact info! thanks!
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Old 02-10-2006, 01:40 AM   #2
Uncle Scotty
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Old 02-10-2006, 08:51 AM   #3
BLACK02WAGON
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I always put a bit of antisieze on the threads when I install them but other than that there isn't anything.
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Old 02-10-2006, 09:48 AM   #4
BigJ04STi
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did you dyno immediately 1 right after the next? Because as we all know dynos never read the same from 1 day to the next. Too many differences from environmantal conditions, to differences in fuel, calibration changes, etc...

Also, what's the part number of the plug you went with? Did you go 1 step colder? Did you go too cold, which would show a loss of power?

What gap did you put it at?
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Old 02-10-2006, 11:26 AM   #5
Crystal_Imprezav
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Weird, with a protune, you should see up to a 30+ HP gain, and same with torque. I've seen plenty of people who got 330HP and 360TQ after installing the one step colder plugs with a protune at Agile! They recomend it to all the protune customers. A 30 HP and TQ gain for $50 is the best bang for the buck i've ever heard of. Get it tuned!
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Old 02-10-2006, 03:59 PM   #6
deathinacan
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i went with the oem replacement plugs, and i didnt use a gap spacer or anything. i tightened them down the way they came out of the box - the mechanic at the suby shop showed me how to do it, and i followed instructions. the car runs fine, and no problems with timing or ignition have come up.

i'm going with the one step colder NEXT month as they are hella hard to come by the last time i checked. i dont know the part number i installed, but if i could find the box, i'd post it up here.

thanks - any other suggestions would help big time!

kor
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