W3DPO replacement Turbo Plug?

[WydRyd]

Guys,

What do you recommend as a replacement to the W3DPO spark plugs?

I've heard good things about Beru S9's and NGK BP8ES's.

What are your experiences?

My existing W3DPO's are severly fouled with thick carbon deposits, so I'm guessing these are a bit too cold for a street driven car. I'm hoping the NGK's would be a better solution, not to mention significantly cheaper

Can't find a reseller of the Silverstone Beru units in Australia, so I guess my choice is limited to Bosch or NGK

Are these gapped properly when bought new, or would one have to re-gap them? What gap should I use? 0.030" ?

[OSI930]

I have been using NGK plugs for years in my motorcycles and watercraft with no issues. Next plug change on my Turbo will be to NGK. The Bosch plugs sure have gone up over the last few years.

[WydRyd]

I agree. I'm NOT paying $27/unit for the W3DP0's

Well, I picked up the NGK plugs anyway. They are gapped at 0.7mm / 0.028" by default.

I'm hoping these won't be too hot for my setup. The W3DP0's are a very cold plug in the 3 heat range. These are in the 8's, so I'm not sure if they'll be too hot, even though they are the recommended replacement for the W3DP0's. Any input here?

What's the recommended torque setting for spark plugs for our engines?

[Porsche Doc]

Hey Man,
The NGK BP8ES's will do fine.
We have been using them for years.

[TOO RUF]

I tried NGK and they didn't work well. I have MSD and used a non Platnium. Bosch W3 Silver something worked great.

[WydRyd]

Originally posted by Porsche Doc
Hey Man,
The NGK BP8ES's will do fine.
We have been using them for years.

Thanks PorscheDoc. Do you typically leave them at 0.28" gap, or re-gap them to 0.24". For the 930 turbo, I believe the recommendation is that they be gapped at 0.24", so I'll give that a whirl and see how they go, even though I run an EFI Carrera turbo'd motor with 930 P&C's.

Also, I didn't realise that the NGK temp scaling works the other way round. Greater number = colder plug, as opposed to BOSCH's scaling, smaller number = colder plug

Can anyone tell me what these should be torqued at? 18lbft? I don't want to tighten them too much and damage my heads Maybe best I finger tighten them with the Porsche tool & use the allen key for another 1/4 - 1/2 turn?

[OSI930]

The factory manual shows 18.5 ft.lbs.

[WydRyd]

Thanks for that confirmation. By the looks of it, it'd be damn difficult to get a torque wrench in that tight space with the intercooler plumbing etc

[Porsche Doc]

Hey Man,
Yea! you can get easy.
Set the gap at 0.26 and you'll be good.
Us Old School shade tree mechanics snug them and then a turn-em another 1/2 a turn.
But 18.5 is Book. Just don't squeeze the crush washer to much.
Thats why I do them old school.

Hey TOO RUF,
Yep Your right!
With a MSD, or Hot ignition set ups like that.
The spark is way hotter have much higher current than the stock system.
They just burn regulator plugs right up.

[WydRyd]

Cool, thanks

Just curious, could excessively fouled (carbon deposited) spark plugs be the result of a bad CHT sensor, making the car run too rich?

If I had a vacuum leak, resulting in unmetered air entering the combustion chamber, they would read as being too lean, right?