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FQ200turbo
05-08-2009, 10:26
i have denso iridium spark plugs and the car making 22psi, but the spark plugs with a few runs, one or two stop working... i have no retard/advance in the ignition, should i retard the ignition ??
Matt Cole
05-08-2009, 13:19
What do you mean they stop working? Are you saying the spark plug soots up or the pressure blows it out??:confused:
5teve L
05-08-2009, 14:02
The denso plugs I tried were shiete, ditch them & get some NGK's in there, I forget which now
FQ200turbo
05-08-2009, 14:17
What do you mean they stop working? Are you saying the spark plug soots up or the pressure blows it out??:confused:

didnt spark no more, the engine begins to work with 2/3 cylinders only
FQ200turbo
05-08-2009, 14:18
The denso plugs I tried were shiete, ditch them & get some NGK's in there, I forget which now

i have denso iridium
i already tried ngk iridium and they only work a few days...
5teve L
05-08-2009, 14:36
What are the plugs.. BE8 EVX or something, I forget now ? Never had a problem with whichever they were & I ran 24psi manifold..
James5
05-08-2009, 14:36
The denso plugs I tried were shiete, ditch them & get some NGK's in there, I forget which now


I used to run 24psi of boost and never had problems with the B8EVX or the Champion N3G's which I run at the mo (But not at high boost anymore).
FQ200turbo
05-08-2009, 14:39
did you retard the ignition ?
FQ200turbo
05-08-2009, 14:41
B8evx
5teve L
05-08-2009, 14:43
Have a look HERE (http://www.rtoc.org/boards/showthread.php?t=971&highlight=spark+plugs)

I may have knocked it back a little, can't remember if I did in the end or not..

Are they dropping the tips or something, can you see if they are getting to hot?
If so then fueling or ign needs adressing, maybe even charge temps.. Don't suppose you know any of the above, what AFR's you have & CT I mean?
FQ200turbo
05-08-2009, 14:52
air/fuel mixture is 11/12 more or less
the spark plugs are fine, just stop working
James5
05-08-2009, 15:09
did you retard the ignition ?

Yes I was running full retard but that was due to my compression ratio being higher than standard.
Ricardo
05-08-2009, 16:12
I used non turbo 5 Campus plugs, my other NGK plugs sooted up and dropped it to 3 cylinders
5teve L
05-08-2009, 16:20
air/fuel mixture is 11/12 more or less
the spark plugs are fine, just stop working


Lol, well what is it 11 or 12 ?
you don't really want more than 12.1-12.4 with that boost, you also need to check charge temps really & yes, maybe knock the ign back a touch, I certainly wouldn't think the need for full retard though.
Get some det cans & see if you are getting any knock..

Actually you didn't say yet wether the plugs are sooted or burnt out ..
Andrew Cooke
05-08-2009, 16:22
Lol, well what is it 11 or 12 ?
you don't really want more than 12.1-12.4 with that boost, you also need to check charge temps really & yes, maybe knock the ign back a touch, I certainly wouldn't think the need for full retard though.
Get some det cans & see if you are getting any knock..

Actually you didn't say yet wether the plugs are sooted or burnt out ..

don't forget that it can get a bit warmer in Portugal than Horsham