From what I have read in past threads, I gather my hesitation at WOT (Bogging) is symptomatic of a fouled plug perhaps? Runs fine at idle...
I am running 16-21 pounds of BOOST depending on upper pulley an have been running NGK TR-6's gapped @ .035'. I was quite happy with the performance. The longevity left something to be desired though...
Any suggestions?

Thanks guys!

 

If you change the plugs, mark which cylinder they came from (drivers 1, drivers 2 etc...) take a picture of them and post it.

WE'll tell you if they look good or there is something that needs to be addressed

 

If your getting a bog at WOT and have'nt changed anything lately? I'd look into fuel supply first.

Rich

 

I will most definately post up a pic when I decide on and install new plugs.
The hesitation is when I get on the gas out of the hole. I then take my foot out of it... It feels like ignition, rather than a fuel issue. The last time I drove the truck it was fine. I started it up yesterday for a l'il spin and it started acting up immediately.
Once again, I thank you for your input folks!

CHEERS!

 

Denso vs. NGK?

 

all a matter of how much you want to spend

Denso $80 and change them closer to 100k
NGK $16 and change them every 7-10K

 

Got ya, and I agree.

I've run both NGK-tr6 and denso it-20s

I'm a fan of the denso's myself. But they are very expensive IMO.

If your squeezing it up to 20psi, I think I'd lean towards the safe side and go with a TR6. It's just more of a bullet proof plug that very few people have had problems with. (as compared to the densos)

Rich

 

Denso IT-20 is the plug?

Would the TR6's be safer?

CHEERS!

 

I thought the TR-6 was only good for a 4-6lb pulley tops? Anything more and you need to go with a colder plug.

I mean, NGK says the TR-6 is the stock heat range, you're running double (and then some) the stock boost, you should look into some colder iridium NGKs.

 

Any code# for the NGK irridium?

 

Tr5 is stock
TR6 one range colder
BR7 two ranges colder

Denso IT20 covers stock and one range
Denso IT22 two ranges colder (which is what i'm running seeing about 13psi)

Bob thompkins is running 20+ through his Kenne Bell with the Denso IT20's with no problems!!

 

Excellent! That's what I was after. Is it safer to go with the NGK's? I would rather install a longer lasting plug if it will not be detrimental being that changing them is such a giant pain in the you know what...


Thanks fellas!

 

Not according to NGK.

 

If I were you I'd run stock number #3690, it's the TR7-IX - $6.99 each, you can get them at Advanced Auto. Gap them at .035, people are reporting rough idle with any larger of a gap on this plug.

I read something once, can't find it right now unfortunately, that said the NGK iridiums are better than the Denso ones for longevity because they have a platinum base for the iridium tip, the Denso one is all iridium and some people say they don't last very long because of this.

 

https://www.f150online.com/forums/sh...d.php?t=156464

Read till your heart is content!