Ok my search isnt working... no idea why

I am going to be running either 50 or 75 shot of NX wet nitrous... stock fuel pump

I was told I need these plugs

NGK type BKR5E-11 Copper Spark Plugs

What would YOU recommend?

 

In stock engine applications and street usage the
spark plugs should be at least 2 steps colder than
stock. Do not use platinum tip, extended tip or
any plug with multiple ground straps or split
ground straps. When in doubt about heat range
always go one step colder. A spark plug that is to
“Hot” will cause detonation, burned plugs, poor
performance, and engine damage.

This is from the NX Installation instructions from their website. This means you should run 2 steps colder which is a BKR7E Copper.

Do what NX tells you.

DO NOT LISTEN TO:
A. YOUR BUDDY!
B. YOUR BUDDY’S FRIEND!
C. THE LOCAL NITROUS GURU!
D. ANY ARTICLE IN ANY MAGAZINE

 

Any disadvantage in running these "colder" plugs? What about gapping?

 

I will be running a 75 wet shot on stock fuel pump and stock plat plugs.

 

Let me know how that goes.... also let me know how your fuel pressure and rich/lean turns out... When is the install?

 

The only difference I fine is that it idles a bit rough when cold and I gap at .035.

Sonic do not use plats you are realling borrowing trouble, listen to what NX says, they have done a lot of testing and experimentation on plugs.

 

Then what should I use?

 

Copper, either BKR6E (1 step colder) or BKR7E (2 steps colder). NOS usually recommends one step, NX two steps colder.

Read the nitrous company literature or check their websites they are very explicit on gap and which plugs to use. Don't listen to people who tell you its ok to use platinum etc etc. Don't listen to me either just do what the nitrous company says.

The -11 on the end of the plug type is the gap. 11 is 1.1 mm or .043". Most companies recommend you close the gap running nitrous, I run at .035.

 

So copper with gap .035 will be good for my NX 75 shot.

 

im using the one step colder BKR6E and gapped to .35 for a 75 shot
My idle is smooth as stock, take a little longer to warm up..

 

To save you some trouble: Autozone doesn't carry NGK plugs, so don't even go there. I went to O'Reiley's to get my plugs. Also I read here to ask for the plugs for a '92 NA 300ZX, but there are no copper plugs listed for that application. Just give them the part #s and don't tell them what car you drive (you'll often confuse them)

Copper
1 step colder BKR6E-11 (O'Reiley's Stock #2756)
2 steps colder BKR7E-11

When I bought my kit I was given a set of Autolite 3923 plugs, but I'd much rather run NGKs. The BKR6E-11 cross references to the Autolite 3923, but the Autolites don't cross reference to the NGKs (go figure).
-hype

 

Killer2002,
What are your jet numbers?? Are they the same as NOS...like .42 is a 75? And do you have a fuel pump or fuel regulator??

Thanks,
Leo