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Spark Plugs / Pfc

justin911

By justin911,
in General Maintenance

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justin911 Grand Master

justin911

Posted
Posted

hey peoples

ive got a r33 with exhaust/intercooler/pfc..

previously the spark plugs were gapped to like 1.1 and i didnt have any problems..

anyways i changed them over today to some 0.8mm ones and everything still seems to be running the exact same, no problems etc but im just wondering i dont need to retune the pfc or anything like that do i ????

Its probably a stupid question.. but i just wana double check just incase something is screwed and im not relising it...

when you do change from 1.1 to 0.8 should there be any noticable differance ?

cause like i said its still running the exact same as before (which seems to be good at this stage)

thanks heaps :)

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justin911 Grand Master

justin911

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ok i went for another test now quickly...

hmm when its on full boost (9psi) im not sure if it feels the same as when it was gapped at 1.1.

like it would go from 60-80km/hr in a couple of seconds... now it kinda takes a while then starting moving...

i dunno though it might just be one of those pychological things..

hmmmm

??

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Emre Proficient

Emre

Posted
Posted

Plug gaps are reduced when running high boost.

Higher cylinder pressures with increased boost can blow the spark out without proper ignition.

In reality larger gaps are more desirable as it gives a stronger spark. You should only reduce the gaps if/when having the above mentioned problem.

In saying that, 0.8mm is not too small of a gap and you shouldn't notice any difference. If you do like you are stating, open the gaps upto standart settings.

You do not need a re-tune.

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justin911 Grand Master

justin911

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cool thanks for that :)

why would it be though that everyone else changes theres from 1.1 to 0.8, but mine isnt as good with them ?

im gonna go for another drive, and check it all again, cause maybe its just me..

but yeah i think it kinda feels like the stock ecu when it goes into r/r mode.. but ive got a pfc... :angry:

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siksII Grand Master

siksII

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cool thanks for that :)

why would it be though that everyone else changes theres from 1.1 to 0.8, but mine isnt as good with them ?

im gonna go for another drive, and check it all again, cause maybe its just me..

but yeah i think it kinda feels like the stock ecu when it goes into r/r mode.. but ive got a pfc... :angry:

Its probably in your head :)

people usually change to 0.8 because or misfiring. Otherwise there is no good reason to change to 0.8. It will make no difference to the tune.

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Emre Proficient

Emre

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why would it be though that everyone else changes theres from 1.1 to 0.8, but mine isnt as good with them ?

Good question !

Why did you change it to 0.8 mm when you had no problems with a larger gap...?

Because it's something you read on the internet and thought was the best thing to do. :angry:

Look, did you gap and change the plugs yourself...? What plugs are they..? Unless you have a dud plug in there for whatever reason, you shouldn't notice anything different.

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justin911 Grand Master

justin911

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basically.. :angry: allthough i did ask people what plugs to get and 0.8 was recommended..

The new / old spark plugs seem to be failry similiar... they both said NGK R on them.. and the model number on them was pretty close as well..

They hadnt been changed since i got my car about 11 months ago though, so i thought would be nice if i change them :) When i pulled out the old ones they were all browny/black and looked kinda used...

Im gonna go for a test drive again now... like you guys are saying thought its probably in my head.

Good question !

Why did you change it to 0.8 mm when you had no problems with a larger gap...?

Because it's something you read on the internet and thought was the best thing to do. :)

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justin911 Grand Master

justin911

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ok i went for another drive...

i guess its in my head, my testing methodology isnt very accurate :angry:

on a diff issue, if one of the plugs were screwed it would only be running on 5 cylinders ya ? and it would be idling a bit rough etc etc ?

its not doing the above... just curious as to what would happen though :)

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