Plug part #'s needed

[ZWILD1]

Changed plugs to NGK's stock heat range. I cleaned out the garage and tossed the old AC rapid fires they were one heat range colder. Parts guys can't tell heat range only know part #'s. Have custom chip that may have turned off knock sensor. Need to use colder plug can anyone help. I would like to go back to the rapid fires. My car is a 91 and still use the plugs with washers. Any help would be greatly appreciated.:jawdrop:

[jonszr1]

ngk irridums also come 1 and 2 heat ranges colder i believe it goes 55 -66 77-. i have some on order from my local napa guy. o dont have the exact number till they come in . i went 1 range colder . hope that helps some

[Jeffvette]

Have custom chip that may have turned off knock sensor.

Why?

[GOLDCYLON]

Why?

I agree why would that be done on a performance chip unless we are talking about some extremly wild camming modification issues?

[Kevin]

Have custom chip that may have turned off knock sensor. . Any help would be greatly appreciated.:jawdrop:
This sounds like a really really bad idea

[Aurora40]

ngk irridums also come 1 and 2 heat ranges colder i believe it goes 55 -66 77-.
I think for the TR55IX it's actually 65 and 75, not 66 and 77. However, that's a '93+ tapered seat plug.

What plug part #'s did you get? If it's something like BRK5EIX, then you'd want a BRK6EIX or BRK7EIX. I'm going from memory on the exact part #, so it may be slightly different, but I'm positive about the 5/6/7 thing.

[ZWILD1]

Not Sure but the queston was raised after I saw white looking plugs with afew showing some gray areas and some speckling on them. I always run the 93 octane fuel, and I'm not sure with headers and no cats and a B&B 3" exshaust if I would even hear any detonations. The chip in my car was done by Marc Randolph. Does anyone know him or even heard of him before. :icon_scra

[Jeffvette]

I'm not sure with headers and no cats and a B&B 3" exshaust if I would even hear any detonations.


Doesn't matter if you can hear them. It matters if you are getting knock. Just because you buy 93 octane doesn't always mean you are getting good gas.

[ZWILD1]

Thats why I pulled plugs and looked at them. I don't even trust the service station. Just because I buy Sunoco 93 octane doesn't mean thats what I'm getting. Just trying to rule things out. ninetyfive percent of my driving is highway miles in sixth gear at 65mph to 85mph. But I do try to blow things out a bit on occasion.

[XfireZ51]

Not Sure but the queston was raised after I saw white looking plugs with afew showing some gray areas and some speckling on them. I always run the 93 octane fuel, and I'm not sure with headers and no cats and a B&B 3" exshaust if I would even hear any detonations. The chip in my car was done by Marc Randolph. Does anyone know him or even heard of him before. :icon_scra

ZWild,

My 92 came with an MR chip. I found his SA curve to be too aggressive for my setup. I would get Knock Retard at 4500rpm+. Dropped some timing and picked up about 4mph at the big end after adding headers. If you have speckles on the ceramic, you have detonation. Your probably giving up some power due to ECM backing off timing. BTW, MR chip didn't disable Knock Retard.

[jonszr1]

I think for the TR55IX it's actually 65 and 75, not 66 and 77. However, that's a '93+ tapered seat plug.

What plug part #'s did you get? If it's something like BR5EIX, then you'd want a BR6EIX or BR7EIX. I'm going from memory on the exact part #, so it may be slightly different, but I'm positive about the 5/6/7 thing.you are righton about the numbers i got mine today they are 6s.getin old cant seem to remember like i used to:mrgreen:

[ZWILD1]

ZWild,

My 92 came with an MR chip. I found his SA curve to be too aggressive for my setup. I would get Knock Retard at 4500rpm+. Dropped some timing and picked up about 4mph at the big end after adding headers. If you have speckles on the ceramic, you have detonation. Your probably giving up some power due to ECM backing off timing. BTW, MR chip didn't disable Knock Retard.
I'm not sure what you mean by SA curve. What does that refer to.

[XfireZ51]

too much Spark Advance too soon

[ZWILD1]

What did you do to get less spark advance.

[XfireZ51]

What did you do to get less spark advance.

I modded the SA tables in the calibration. :-D

[32valvZ]

My 92 has the same mods as the OP. I sent the chip out to Marc & told him I was gertting knock, but it seems like its only when its hot and on take off from a stop. 'm not really sure what he'll do for that. I can only get 92 octane gas here. I just hope its gone when I get the chip back.