New Spark plugs (3 to choose from)
 

Looked at Pelican parts for new plugs and found that I have a choice of 3. The Bosch +4 plats, WR7DC, and WR7DP.
I think that the DP's are oem stock, so what is the DC's? or should I just go for the +4's?

My '86 Carrera only has a Steve Wong chip. no other mods.
I will probably buy Magnecor wires at the same time.

Anyone shed some light on this.

Cheers
se

Don't go with the platinums, early ignitions don't react very well to platinum plugs. I'm not sure about the other two, but your choice has been reduced to two.

DP's are also platinum, DC's are copper. Go with the DC's, there's no advantage, performance wise, with the others. BTW, DC's are stock.

Jerry M
'78 SC

I agree. I switched to platinum double electrode and my 3.2 seemed to run with a little less "pop". I'm going back to copper single electrode on the next oil change/valve adjust.

WR7DC

BTW, this brings up a question of my own (not to hijack your thread or anything). Has anyone tried those new iridium plugs yet?

My son recently purchased a Chevy pickup,a 1999 I believe with about 75000 miles so one of the first things he did is oil,filter,air filter and spark plugs to have a good baseline to start with,after all these changes the truck had a little bit of a high speed miss to it,you guessed it he purchased twin electrode platinum plugs,I told him to change them to plain jane plugs(AC Delco copper) and the truck ran great!!! Now this is a vehicle with modern ignition and fuel injection,in my opinion platinum is junk.

I have posted here before about this. I put platinums in my car and it got so bad it would shut down. It couldn't hold idle. I put the old original bosch plugs that I had taken out and put them back in and it ran great again.

I traded that junk for the original bosch and I haven't looked back.

I have even heard that you could burn a piston with those things.
I have not personally seen this but a guy I know who used to race porsches says that he has seen it happen.

I know that it has been shown that some things can be improved in what the factory shipped out but I think for the most part it is always best to use oem equivalent parts. Trying to get more performance out of these cars is usually not going to work out by using the latest greatest filters, plugs, air-rams etc.

It just ain't that easy:D

here is another option

wr7dtc

it's the same as the wr7dc but it has 3 ground electrodes.

Has anyone tried surface gap plugs?
I use them in my RX7...with great results.
Bob

Let's see...3 plug options listed, and mine is the 10th response? Oh well, what the Hell...

I have the NGK Iridiums in my '87 Carrera and feel they don't give the same punch as the standard copper core version. My next try is a little known plug from Delco called Rapidfire. Everyone on the Corvette BBS swear by these. I put a set in my truck and noticed an improvement over the Autolite. The part no. for the Carrera is #4. Problem is Delco doesn't publish much info. for applications for these plugs so I'm guessing about the part no., looks correct.

I have to also chime in with a neg on the plats. I have them on another car and the difference is noticeable in a negative way. They were $5 per too! I won't try them again.

todd
86 cpe

Again, IMO if the vehicle was originally shipped from the factory with copper plugs, stick with copper. Platinum is the better plug because the material is self cleaning by nature *if* the ignition system of the vehicle is so designed that it has a high enough igniton system output to fire the plug (jump the gap with adequate spark.) Many cars do not. Say a distributorless igniton in an M3 with a coil pack at each cylinder, or a VTEC with a higher output ignition, you'll go 50k miles of abuse before the need to change plugs. And as the plug wears, the gap increases, but who cares, it has enough electrical snort to jump the gap on the plug. Not as good an idea with a 15-20 year old 911 ignition design...

In the Porsche I run copper. In my 2000 Solara w/Supercharger I switched from platinum to iridium (I needed a slightly colder plug than stock with the supercharger and decided to try iridiums). Both work great for their application.

Pat

Hey movin, let us know how that experiment goes.