Advanced Forced Induction & N/A Engine Tuning This forum is brought to you by Racing Greed in Port Coquitlam.
Supercharger vs Turbocharger vs NA? Hondata vs Megasquirt? 94oct vs 87oct? Through technical discussion, let's find out what will the best option for you...
 |
 | 
01-13-2010, 12:17 AM
|
#1 | | OMGWTFBBQ is a common word I say everyday
Join Date: Nov 2005 Location: Vancouver
Posts: 6,044
Thanked 315 Times in 149 Posts
Failed 53 Times in 33 Posts
| VQ35 NA build, what plugs?
So i have a 2004 G35 with a Vq35DE, obviously
anyhow i have some NA mods with it, full 2.5" catback, intake, plenum spacer, and will be installing my high flow cats in a few weeks time,
eventually that will be my build, will not consider headers.
i want to get an Osiris tune during the summer time
now my car is currently parked and i have time to work on it, i was thinking about replacing the spark plugs. with the build the way it is and getting a tune, i was thinking about advancing the timing by 2 degrees and going with a hotter spark plug. now the stock plugs are a #6, would a #5 be beneficial? or should i stick with #6 heat range?
your input is appreciated.
__________________ 1996 Honda Accord 1995 Nissan 240sx 2004 Infiniti G35 2005 Honda Jazz BuySell Feedback Quote: |
"It's called Sex Panther by Odeon. It's illegal in nine countries... Yep, it's made with bits of real panther, so you know it's good ... They've done studies, you know. 60% of the time it works, every time. "
| | 
|  | |
01-13-2010, 08:07 AM
|
#2 | | RS.net Licensed Vendor
Join Date: Nov 2007 Location: vancouver BC
Posts: 230
Thanked 107 Times in 25 Posts
Failed 13 Times in 1 Post
|
Usually, you want to go colder plugs as you make more cylinder pressure, which can caused by boost or higher rev.
For your settup, it's hard to say what will work best, but factory heat range will just work fine for what you're getting.
| |
| | |
01-13-2010, 08:30 AM
|
#3 | | 14 dolla balla aint got nothing on me!
Join Date: Oct 2001 Location: Maple Ridge
Posts: 654
Thanked 279 Times in 95 Posts
Failed 47 Times in 13 Posts
|
As stated above.
To my understanding (and what I have used different plugs for), is that a “colder” plug has more ceramic for cooling purposes.
A cars plug needs to hit a certain tempature range to make sure there is no crazy deposit build up. However if you go too hot (less ceramic area for cooling), this allows for detonation, and you will get ping. When adding more pressure to the cylinder (and heat), you need to find a way to combat pre ignition, detonation, or ping whatever you want to call it, so in part you move to a colder plug (usually along with higher octane gas and a tune).
In your case, I can’t imagine adjusting the timing would result in enough extra heat and pressure in the cylinder to warrant a colder plug, so sticking with the factory suggested would probably work fine. Going to a hotter plug can only cause you issues, and I cant imagine why you would want to do it.
Generally I have only seen Colder Plugs come into play in boost/High compression NA Builds. I have NO Nissan Engine expereince, but i would imagine they are the same. Someone correct me if I am wrong.
| |
| | |
01-13-2010, 08:33 AM
|
#4 | | Oh goodie, 5 posts already!
Join Date: Jan 2010 Location: Vancouver
Posts: 6
Thanked 0 Times in 0 Posts
Failed 0 Times in 0 Posts
|
Stay with the stock heat range unless you start increasing your compression ratio, most of the stuff you have done is just "bolt on" power adders. Basically you have freed up your entire intake and exhaust allowing your car to move air into the engine faster and let exhaust flow with minimal back pressure. Advancing the timing or changing the stock tune wont be an issue either as factory tunes are usually pretty mild just for reliability and sustainability for every day driving, so a colder plug isnt really required; however you could move up to a plug that fires better such as an iridium plug or something that has a little more zap to it, but even this isnt required.
| |
| | |
01-13-2010, 10:59 AM
|
#5 | | OMGWTFBBQ is a common word I say everyday
Join Date: Nov 2005 Location: Vancouver
Posts: 6,044
Thanked 315 Times in 149 Posts
Failed 53 Times in 33 Posts
|
Hmmm I thought colder plugs were necessary for FI/race. But I thought for NA a hotter plug would help. I guess I was misinformed. Okay standard plugs it is. Thanks guys Posted via RS Mobile | |
| | |
01-13-2010, 02:28 PM
|
#6 | | Need my Daily Fix of RS
Join Date: Apr 2008 Location: GVRD
Posts: 256
Thanked 34 Times in 9 Posts
Failed 1 Time in 1 Post
|
An engine with a specific output relative to it's displacement and number of cylinders will require the plugs to be able to dissipate heat at a certain rate in order to stay cool enough to not cause pre-ignition, but stay hot enough to do their job without fouling.
Too cold, they foul. Too hot, you might get preignition or possibly detonation if chambers get to hot in general (oversimplifying).
Therefore it's very rare to need to go hotter - only colder to avoid preignition as specific output goes up.
A very loose rule of thumb is to go one step colder per 100hp over OEM as a guidline. Beyond that you need to evaluate the plugs when dyno tuning.
My motor makes roughly 150hp more than stock and works good with one step colder. (NGK 7 heat range - pretty common for many pent-roof chamber forced induction motors).
I would stick with stock unless the manufacturer of whatever chip you decide to run recommends otherwise.
__________________
1983 Volvo 240 Wagon. S80 T6 Swap.
541whp/467wtq, SpeedPro Dynojet Quote:
Originally Posted by dizzystar  I am better than everyone, you, your brothers, sisters, fathers, moms, even your fucking dogs. I can drive all drivetrain platforms and all types of industrial machinery, and I got a fucking nuclear sub, yeah thats right, a fucking nuclear sub.
fuck you, and all your shit.
this is revscene in it's entirety. /thread. | | |
| | |
01-14-2010, 05:20 PM
|
#7 | | Dip Dip Dip Dip Mod
Join Date: Jun 2001 Location: la la land
Posts: 8,551
Thanked 152 Times in 68 Posts
Failed 2 Times in 2 Posts
|
leave the #5 plug in it. thats the stock range and you dont need anything fancy or colder with what you are trying to do.
im currently running a #9 plug (about 4 ranges colder). sounds a bit ridiculous but its working. lol
__________________ Team 4 MotorSports Island Speed Lab...+1
Speed is our business
88 CRX - Turbo AWD
03 G35- HKS GT Supercharged - Toy
03 Cummins 2500 - Tow Rig/ Money maker Quote:
Originally Posted by NashMan think befro you type | | |
| | |
01-15-2010, 12:35 AM
|
#8 | | OMGWTFBBQ is a common word I say everyday
Join Date: Nov 2005 Location: Vancouver
Posts: 6,044
Thanked 315 Times in 149 Posts
Failed 53 Times in 33 Posts
| Quote:
Originally Posted by Super Dipper leave the #5 plug in it. thats the stock range and you dont need anything fancy or colder with what you are trying to do.
im currently running a #9 plug (about 4 ranges colder). sounds a bit ridiculous but its working. lol | isn't it # 6 right now?
__________________ 1996 Honda Accord 1995 Nissan 240sx 2004 Infiniti G35 2005 Honda Jazz BuySell Feedback Quote: |
"It's called Sex Panther by Odeon. It's illegal in nine countries... Yep, it's made with bits of real panther, so you know it's good ... They've done studies, you know. 60% of the time it works, every time. "
| | |
| | |
02-19-2010, 11:37 AM
|
#9 | | Ready to be Man handled by RS!
Join Date: Feb 2010 Location: kamloops
Posts: 78
Thanked 2 Times in 2 Posts
Failed 9 Times in 1 Post
|
Yes for N/A a colder plug should only be used with increased cylinder pressure (more pressure=more heat). Spark plug heat ranges are based upon how far the electrode protrudes into the cylinder. If it protrudes deep into the cylinder, the plug loses some ability to transfer heat to the cylinder head. If it protrudes less into the cylinder the plug can more easily ttransfer heat to the head=colder plug. Tip: DO NOT use anti-sieze on the plug threads!! Modern plugs have a special plating on them to prevent electrolysis between the steel plug and aluminum head, also the plug needs to ground to the head properly in order to fire.
| |
| | |
Posting Rules
| You may not post new threads You may not post replies You may not post attachments You may not edit your posts
HTML code is Off
| | |
All times are GMT -8. The time now is 03:03 PM.
|
You are currently viewing our boards as a guest which gives you limited access to view most discussions and access our other features. By joining our free community you will have access to post topics, communicate privately with other members (PM), respond to polls, upload content and access many other special features. Registration is fast, simple and absolutely free so please, join our community today!
The banners on the left side and below do not show for registered users!
