so 7's would be good up to how big of a nitrous shot?

 

up to 225 or use the 8`s up to 300

 

NO!!!! I'd throw the 8's in around 175 to be safe... 8's are no where near good enough for a 300

 

Who's your tuner?

 

And yes deffinitely go to an 8 at 200 just to be safe

 

If you only plan on doing 200hp then i wouldn't bother with putting the 8's in there unless you want to. The BR7EF will suite you needs on the 200hp hit.

 

I would start off with an 8 on a 200 shot just to be safe. Just my .02

 

I'll probably get a vacation for this, but why would you tell him this. He needs to start with the safer plug and then move to a hotter plug if you don't see color on the ground strap...

I guess I feel like you guys market too hot of a plug for a given shot... Hell, y'all almost had me set on tr-6's for an earlier nitrous setup years ago before I started doing my research and talking to people... Maybe y'all know something me, Baked, ATV, Shiz, etc. don't.

 

im with chris on this one.

i feel this is super conservative. better safe than sorry i suppose so i would have a set of 7s ready to go in at the track after a run wit the 8s

 

Damn! Made up my mind between the 6's and 7's now gotta decide between the 7's and 8's. I'd like to spray a 200 a couple times but will likely stick to 150 most of the time.

 

I don't see why you should get a vacation for your statement. The 8 range plug would be a great point to start off with but it is not the definite answer. We have seen/ tuned several cars on a 200hp hit with the 7's with no problems and we have several customers running the 7's on a 200hp hit and thats why i suggested it from personal/ professional experiences. The 7 is on the border line of time to go to a colder plug. Reading the strap will tell you if the plug is to hot.

Being that this guy has a H/C + bolt on's car the 7 usually looks great on that type of set up.

There have been some that have bad luck with a TR6 but look at how many years people have run that plug with no problems. Hell i ran a 200hp shot on TR6 yrs ago with no problems at all..Never once melted a plug. Now a days i wouldn't do it because there is a wider variety of plugs to choose from unlike years ago.

So to sum it up. I have no argument with using a number 8 plug at all. But most of the cars we have tuned comparable to this guys set up we have used number 7's and we shoot for a safe tune up of 11.8 air fuel and yank about 8-10 degrees of timing.

 

Just so you don't feel lonely, I sprayed 175 with the TR6 plug and had no problems. I know that is the equivalent of having a blow torch in there, but the plugs looked good. Nevertheless, I went colder to be safe. Even though I technically worked backwards, I agree with everyone in that the OP should start cold.


The rule of thumb that I have heard from a few sources is 1 heat range colder per 100hp over stock. Since the OP has heads and cam, that would put him in a 6 from the start. Add 100hp n20, that's a 7, another 75-100 that's an 8. While this is only a "rule of thumb", it seems to ring true here.

Personally, I don't like driving around with the cold plugs, so I just change mine. It's not like your changing plugs on an LT1 or something. At the same time, I don't spray my car on the street, so I don't have any need to have that cold of a plug in there for normal driving.

 

What kind of a difference would it make on the motor driving around on these 8 plugs compared to the 6 or 7? I just bought the sevens by the way but I can still exchange them.

 

Im in the same boat and would like to know this as well.

 

None if the tune is right.

 

Would changing plugs require changing the tune? I believe my tune is right on where it should be with the current plugs im using TR55. So could I keep the same tune after switching plugs you think or would the new plugs require a retune?

 

Shouldn't need a retune. As long as the tune is lean enough and has enough timing in low rpm/part throttle it won't foul the colder plugs or make any measureable difference. If it starts to foul them out, pull some fuel/add timing and see what that does.

 

Are the 8's projected or non-projected tip? What should they be gapped to?

 

non projected and i would say 26-28

 

part # for the NGK 8's?