slammin86

iTrader: (4)

What are everyone's thoughts here. My compression is around 11.0-1. I have mahle pistons, callies rods, stock crank, arp bolts and head studs. I have a 347" ls1 w/ stock 243 heads, ls6 intake manifold. Motor was built around nitrous so rings are gapped a little on the larger side.

I was spraying a 150 shot through a single nozzle on 91 octane. I was running 22 degrees max wot timing on this shot.

I now have a plate kit and want to up it to a 200 shot. Can I pull this off with 91 octane? I have HP tuners and can pull as much timing as I want. I had planned to start off at 16 or so. I run the NGK-BR7 plugs gaped to .33.

Where I live 91 is as high as I can get. If I drive 20 miles I can get 94 out of a former BP station. There is a knowledgeable nitrous guy close to me (also a member here) who has said he would help me read the plugs so that will be taken care of.

Thoughts?

ATVracr

iTrader: (5)

Colder plug will help alot.

Keep the timing low and work up.

slammin86

iTrader: (4)

Should I go colder than the br7?

ATVracr

iTrader: (5)

Yes, I would go to a -9 or -10

Start around 16* make a 1/8th mile hit.
Dont be suprised if its slower on the 1st hit.... once you start putting timing in it it will pick up fast.

ND2RACE

I'm sure you're much more experienced in this, but why go 2-3 steps colder when he's only talking about going from 150-200? I'm in a similar situation as the OP in wanting to go bigger then 150, and it seems like the "basic" nitrous guidelines change a lot when spraying more.

ATVracr

iTrader: (5)

The plugs will not hurt performance so why not be on the safe side?

200 shot on 91oct. is not something I would do a whole lot. That fuel is inconsistant I bet which makes it even worse. If you must do it, be as safe as you can be.

We run C23 and -11 plugs on ANY nitrous tune up on our car.(200 shot on 1st kit)If the cold plugs hurt do you think we would use them? They will allow you to run a little more timing if anything and they pull the heat out of the chamber faster.

I dont know why everyone is so scared of cold plugs? If your spraying then use everything you can to help keep your motor from detonating. All you guys with stock **** need to run a colder plug in #7 and 8 .. hell 2 steps colder if you stepping on the tune up.

Man I need to charge guys for this kind of info. LOL !

camscam02

iTrader: (21)

I had a short and sweet response to that question and I posted it but I guess it was erased when the forum crashed for a little while earlier ago. Oh well.

main point, heat and timing on pump gas. Take the heat away and you have a better chance at keeping it "safe"

87silverbullet

iTrader: (11)

I don't know why you haven't started charging. You could end up getting some money in your pocket to pay for all the nitrous you use.

I'd pay ya to help tune my car on the bottle, but were too far away from each other.

ATVracr

iTrader: (5)

I wouldnt want to tune it for you, I would want to show you how to tune it yourself.

I wont be able to go to the track and help you all the time and when conditions change or you want to go faster why pay someone?

Buy the software and post pics of your plugs, we will get you (and anyone else) dialed in and you will learn along the way.

ND2RACE

I'm not scared of cold plugs, trust me. I had my first bad nitrous experiences 3-4 years ago when everyone said put TR6s in it, and I came home on a trailer with holes in the motor. Thanks to your and Cam's posting I now run BR8s, and the engine in my car has never been happier. I'm just trying to get as good of an understanding I can, I can't afford another engine.

What are the part numbers to the colder plugs? BR8EF is the coldest I've found, is it just BR10EF?

I am really glad you guys are out there getting all your experience and sharing it with the rest of us, I don't post much but I have read a lot your guy's posts and it is very appreciated.

dnkynrbk

iTrader: (34)

Listen to ATV. He has help me out alot. Im running 9s on a 200 shot now. With no problems with only 16 degress of timming. Yeah its safe but I want that I work and have a family I cant go on the edge just to gain a couple of tenths.

ryarbrough

iTrader: (18)

Yup.... Nitrous is your power adder, not timing. Sneak up on it and keep it safe.

Cheeks

iTrader: (1)

Kinda wanting to know this myself, I'm getting ready to head down to MIR for a track day and am going to start spraying my motor

slammin86

iTrader: (4)

ok I will swap to a colder plug and I will go ahead and go with the 94 octane to be a little safer.

ill go with a #8 or #9 plug. why should I gap it at?

ATVracr

iTrader: (5)

Tapered seat ....

Nitrous (two steps colder)
Heat Range: 7
Gap: Consult
Plug: NGK BR7EF (stock number 3346); NGK TR7IX (stock number 3690); Autolite AR94; Denso IT22 (stock number 5327)

Nitrous (two and a half steps colder)
Heat Range: 8
Gap: Consult
Plug: NGK B8EFS 1049

Nitrous (three steps colder)
Heat Range: 9
Gap: Consult
Plug: NGK B8EFS 1085; Autolite AR93

Nitrous (four steps colder)
Heat Range: 10
Gap: Consult
Plug: NGK R5724-10 (stock number 7993); Autolite AR92

Gasket plug .....

MFG Recommendations: approx 11:1 compression
Heat Range: 8
Gap: Consult ignition mfg.
Plug: NGK R5672A-8 (stock number 7173); Autolite AR3911; Champion C63YC (stock number 796); Denso IQ24 (stock number 5314)

MFG Recommendations: approx 12:1 compression
Heat Range: 9
Gap: Consult ignition mfg.
Plug: NGK R5672A-9 (stock number 7405); Autolite AR3910; Champion C61YC (stock number 785); Denso IQ27 (stock number 5315)

MFG Recommendations: approx 13:1 compression
Heat Range: 9 - 10
Gap: Consult ignition mfg.
Plug: NGK R5671A-9 (stock number 5238); Autolite AR3933; Champion C59CX (stock number 296); Denso IK27 (stock number 5312)

MFG Recommendations: approx 14:1 compression
Heat Range: 10
Gap: Consult ignition mfg.
Plug: NGK R5671A-10 (stock number 5820); Autolite AR3932; Champion C57CX (stock number 295); Denso IK-31 (stock number 5321)

https://ls1tech.com/forums/nitrous-o...o-read-me.html

slammin86

iTrader: (4)

I will look at this one. What would you suggest for the gap?

Edit: Should this actually be a B9EFS for a 9 heat range?

ATVracr

iTrader: (5)

Ya it should be B9EFS... I just copied it sorry.

They come gapped 28 out of the box I would run them there, be fine.

slammin86

iTrader: (4)

So what effect, if any, would going from a #7 to a #9 when it comes to hp on motor? Any driveability issues? Plugs foul out faster?

ATVracr

iTrader: (5)

Maybe 5hp ... plugs would cloud up faster if the idle tune isnt as lean as it should be. I wouldnt think they would foul out unless the tune is WAY off.

3fingas

iTrader: (16)

Dr. Moms Otoscopes FTW!