Hey all...Does anyone know what the part number for NGK R's are for our P5's???
What about the plugs that are 2 ranges colder? Anyone know the numbers? I need colder plugs for the ZEX

 

Get some Denso Iridium Plugs much better quality plug in my opinion. Part number IK20 will give you 4 heat ranges colder. IK18 would be 2 heat ranges colder stock is IK16. I'm running 4 ranges colder due to NOS and Turbo.

 

How is it that you are running NGK wires??? Did you replace your stock ignition system????
How much do the iridiums go for???

 

The '00 ES uses 2 coil packs but is still DIS the 01+ uses direct fire with individual coil packs on each cylinder. The Iridium Plugs don't come cheap they run around 10-12 bucks each. Go to www.IridiumPower.com and you can order them through there. I believe with shipping and all it ran me 55 bucks. But they are impressive plugs. On a race turbo engine they made 50 more HP than the NGK plugs and they have the dyno graphs to prove it. I'm nto saying you will get that with your pro cause you won't but I did feel a slight difference in power and alot smoother revs.

 

I never said they didn't ***** up plugs I just said it made it I have no info on the type of boost or anything that they were running. I just know that they are a little smoother than the NGK's i had in my car before. Plus its real easy to find heat ranges in them just change the last two numbers,.

 

Iridium or Platinum or Copper core....I cant really say much about the Iridium plugs because I have no 1st hand experience with them...BUT...I have plenty with platinums and coppers...In my PERSONAL experience and many others too, I have found that one of the best performing plugs are the NGK Resistors with the copper cores...It is well know for DSMers that these are the best plugs to run with (in colder ranges of course) especially under tons of boost...Platinum plugs in my experience do last longer...but run hotter and that is a concern with boost. I dont know about the Iridiums...but I will say that $50 for plugs is alot I think that the NGKs are still the best value for the performance and price...so what if you might need to replace them every 3000 miles under hard driving conditions (if you race or run lots o boost)...anyone running a modified engine should be checking/maintaining it regularly anyway IMO.

 

Yeah don't use Platinum on N2O or boost. They do run extremely hot and I have seen many guys here melt platinum plugs from N2O and a couple from Boost. so word to the wise stay away from platinum no matter what the people say about them.

 

I think the coils and plug wires are more critical than the spark plugs. The different materials only effect the durability of the plug. Platinum and Iridium let auto manufacturers claim 100K mile tune up intervals. Auto idiots eat that stuff up. Higher cylinder pressures do resist the spark from bridging the gap between electrodes, but reducing the spark plug gap works just fine in that case. Heat ranges matter, again for the durability of the plug, but different ranges are available in all materials. Mazda has a bit of a reputation for their poor quality carbon core plug wires. Instead of spending $40 to $50 dollars on plugs, I'd get decent spark plug wires that won't break down and restrict the power delivered to the plug. Better coils would also produce a stronger spark. I have to agree with Jesse. The only way spark plugs make a difference on a dyno is if one set isn't firing for some reason.

 

With my old Shelby Turbo I always foung the NGK copper to work the best. Tried everything in that car from Splitfire, to Bosch platinum and always went back to NGK.
The car- 86' Dodge Shelby turbo, Mopar performance head ( bigger valves, slightly decked, higher lift cam) Mopar aftermarket performance chip for Intercooler, (although I never installed an intercooler, thank god for 104+ octain boost!) Running 14psi. Sold the car with 140,000km. on it and it would still wax the 89 mustang gt I bought after.

Don

damn I miss that car with all the ricers here.

 

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Here is the answer to the original question.

If you are talking about copper plugs then the 2 steps colder plugs have 2 part numbers:

BKR7E-11
NGK1283

These are the plugs that I have.

I believe the stock plugs are BKR5E-11.

 

Thanks!! I was wondering how many posts it would take...

Linuxnija: How did you "*****" up your engine?

 

I "phucked" my engine by hooking up my vacuum lines to my Zex kit incorrectly. I should not have T'd the manifold connection to two places like the guy at the shop said.

 

Hey Greddy917,

Where did you get your Fidanza flywheel, and how much was it? How much does it weigh?

 

The '01+ Protégés still only have two coils. The have dual outputs, and fire two cylinders simultaneously. I wasn't referring to better quality coils as much as I was coils with more secondary windings. This would generate higher voltage, and thus, a stronger spark. It's not really necessary, but it would be a better means of getting a stronger spark than changing plugs, IMHO.

 

Very true, but I thought this came up as a result of a claim of a 50HP gain on a 'race turbo' application?