Replace your Sparkplugs!!! NOW!

Post by **Kenrik** » Mon Jan 21, 2008 4:11 am

This is for high mileage G's.. Replace your sparkplugs!!

My G has been having some rough idle and the gas mileage has gone down in the past 35k miles since I bought it last year (From 21-22 MPG to 18.5 - 19 MPG)

My car is at 80K miles and I did mine yesterday, WOW. The plugs looked awful, there was blowout on the stems and the tips on all the plugs were slightly melted. I checked the gap on the plugs and it was as follows (Stock gap is .44) - 50,55,48,52,56,49

Ignore anyone who tells you that they are good until 80-100k they are WRONG. From the look of these plugs they should have been changed at 60k.

The idle is smooth now and I gained Tons of HP in the top end (4.5k - 5.5k it pulls hard)

(Butt Dyno says 15HP)

So the moral of the story is: High mileage G's change your plugs!

Post by **SVTCOBRA** » Mon Jan 21, 2008 5:12 am

Thanks, good to know. one of my sedans is at 51k, so I'll check them at 60k

Post by **Kenrik** » Mon Jan 21, 2008 5:32 am

SVTCOBRA wrote:Thanks, good to know. one of my sedans is at 51k, so I'll check them at 60k

Well it's only $30 for the stock plugs and $60 for NGK Iridium. IDK why people don't change them until 80 - 100k it's not like a clutch or anything that will cost you a few hundred.

That reminds me.. Remember that post on shifting techniques? Well there was a video in there with some kid driving a Mini and I remember him saying "it's better to let your wheels spin rather then feather the clutch because a clutch is more expensive then tires" Well he lost all credibility with me when he said that. Maybe for his crappy little mini with 195/55/14 but not for a real sports car. Just one tire for a G35 can cost more then a clutch kit.. ($250 for a stock clutch kit)

Anyway I know it's off topic but it just came to mind.

Post by **IlsG35** » Mon Jan 21, 2008 5:32 am

yea i did mine at 59853 miles n they looked like they needed to be replaced already... so yea they not 100k plug they 60k plugs...

Post by **zozoka1212** » Mon Jan 21, 2008 5:49 am

Kenrik wrote:
Well it's only $30 for the stock plugs and $60 for NGK Iridium. IDK why people don't change them until 80 - 100k it's not like a clutch or anything that will cost you a few hundred.

That reminds me.. Remember that post on shifting techniques? Well there was a video in there with some kid driving a Mini and I remember him saying "it's better to let your wheels spin rather then feather the clutch because a clutch is more expensive then tires" Well he lost all credibility with me when he said that. Maybe for his crappy little mini with 195/55/14 but not for a real sports car. Just one tire for a G35 can cost more then a clutch kit.. ($250 for a stock clutch kit)

Anyway I know it's off topic but it just came to mind.

BMW engine!!

Cost you a lot more to work on.

zozo

Post by **ACoupe** » Mon Jan 21, 2008 6:07 am

I replace my plugs every week...

Post by **Kenrik** » Mon Jan 21, 2008 6:07 am

zozoka1212 wrote:
BMW engine!!

Cost you a lot more to work on.

zozo

Nope, a clutch kit for the Mini runs $200.Come on... that car is so small you don't even need a lift... just get two strong guys and BAM they can pick it up.

Post by **Kenrik** » Mon Jan 21, 2008 6:08 am

ACoupe wrote:I replace my plugs every week...

Post by **BrandAidDesignG35** » Mon Jan 21, 2008 6:17 am

Yo Kenrick...

tell me... Did you do a couple pulls before and after you changed the plugs??? yeilding 15 whp??? That's amazing... I just bought mine, it's at 80,000 KILOMETRES... probably a good time to swap em'

Thanks, I'm also getting the grounding wire kit next week, should be kick-ash along with the F5 fujita intake, I'll have my 5AT performing like it should... and sounding like it should... he he...

Do you recommend the iridium NGK or just stock NGK!?! Thanks all...

Post by **grantman240z** » Mon Jan 21, 2008 6:17 am

Kenrik wrote:That reminds me.. Remember that post on shifting techniques? Well there was a video in there with some kid driving a Mini and I remember him saying "it's better to let your wheels spin rather then feather the clutch because a clutch is more expensive then tires" Well he lost all credibility with me when he said that. Maybe for his crappy little mini with 195/55/14 but not for a real sports car. Just one tire for a G35 can cost more then a clutch kit.. ($250 for a stock clutch kit)

Anyway I know it's off topic but it just came to mind.

I remember that video as well. The video itself wasn't bad...however, I thought the same thing when he was talking about the cost of tires. My PS2's on the rear put me back about $800...yeah, thanks, I'll be feathering the clutch.

Post by **Kenrik** » Mon Jan 21, 2008 6:45 am

BrandAidDesignG35 wrote:Yo Kenrick...

tell me... Did you do a couple pulls before and after you changed the plugs??? yeilding 15 whp??? That's amazing... I just bought mine, it's at 80,000 KILOMETRES... probably a good time to swap em'

Thanks, I'm also getting the grounding wire kit next week, should be kick-ash along with the F5 fujita intake, I'll have my 5AT performing like it should... and sounding like it should... he he...

Do you recommend the iridium NGK or just stock NGK!?! Thanks all...

Well it's not that I "gained" 15Hp.. more like reclaimed 15HP that had been lost. I have a Intake and a Intake spacer but the top end was still lacking... I think the spark was blowing out due to the gap of the plugs (they had melted so the gap was bigger)

I'l post up pictures later.

Post by **infinititech1** » Mon Jan 21, 2008 12:57 pm

i dunno who said 80k or 100k but they are due at the 60k service

Post by **C-Kwik** » Mon Jan 21, 2008 3:29 pm

I should be up for a spark plug change real soon on the Titan. I'm probably going to try out the Denso SK Iridiums as they are only 6 cents more per plug than the OE Platinums. They have an Iridium Center electrode and a platinum ground electrode, so wear should be no worse and perhaps better (particularly in the iridium). Iridium conducts electricity better as well so there may be better performance. With the mileage the Titan gets, any increases will be welcome.

Post by **zozoka1212** » Mon Jan 21, 2008 8:08 pm

Sounds fancy

zozo

Post by **tollboothwilley** » Tue Jan 22, 2008 4:58 am

I went with the NGK Iridium, and I like 'em so far...

Changed them out about 5K miles ago

Post by **smockers83** » Tue Jan 22, 2008 7:20 am

Yeah I'm not sure who said 100K miles, who ever did is in rough shape. You're supposed to change them at 60K miles.

Post by **C-Kwik** » Tue Jan 22, 2008 8:32 am

tollboothwilley wrote:I went with the NGK Iridium, and I like 'em so far...

Changed them out about 5K miles ago

The longevity of your plug may be questionable. To my knowledge, there are no NGK Iridium plugs that have a precious metal ground electrode available in the states. At least not through normal distribution channels. While the performance shouldn't suffer during it's service life, the service life may be shortened.

A single Iridium plug is designed for use in an ignition system that uses a single coil and distributor as the spark only moves in one direction. But with cars that have coil packs there is a spark ignited in both directions, so a single precious metal electrode spark plug will wear faster. The Denso SK series plugs have a platinum ground electrode. Their IK has a iridium center electrode, but standard U-groove ground. But it's an ultra fine wire tip which should perform very well, but have reasonable life in a motor that uses a single coil.

Post by **Road Ruler** » Tue Jan 22, 2008 9:09 am

I have 75K on my G. Seems to run fine but will change the plugs soon. Will use stock plugs. What gap is optimal?

thnxs

Post by **TeflonG35** » Tue Jan 22, 2008 1:23 pm

The NGK Iridium plugs don't have to be gapped right? I thought I read that somewhere. I could be wrong, i haven't changed mine yet, though they will be due soon. Curious because i will be changing them soon.

Post by **tollboothwilley** » Tue Jan 22, 2008 1:29 pm

i had to gap mine...

Post by **93jdirty'** » Tue Jan 22, 2008 8:00 pm

[QUOTE=Kenrik]

Well it's only $30 for the stock plugs and $60 for NGK Iridium. where did you find plugs that cheap? for all 6?

Post by **C-Kwik** » Wed Jan 23, 2008 9:13 am

I believe the gap for the G35 is 0.044". Plugs with precious metal on either electgrode shouldn't need to be gapped. They are typically gapped from the factory to the required setting.

It is not advisable to gap one of these plugs unless you know what you are doing as it is somewhat easy to accidentally pop off the button of platinum or iridium on the plug.

Post by **joe603** » Wed Jan 23, 2008 9:15 am

What about indexing??? Do you think that's necessary with the VQ35?

Post by **Road Ruler** » Sat Jan 26, 2008 6:00 pm

Thn

C-Kwik wrote:I believe the gap for the G35 is 0.044". Plugs with precious metal on either electgrode shouldn't need to be gapped. They are typically gapped from the factory to the required setting.

It is not advisable to gap one of these plugs unless you know what you are doing as it is somewhat easy to accidentally pop off the button of platinum or iridium on the plug.

thxs for the info CK!

Post by **cweberj30t** » Wed Jan 30, 2008 6:52 am

Just changed last night. I have 71k on my sedan. Used the NGK Iridium. Took me an hour and 15 mins to do all 6. Would have been faster if I could keep my plug socket from sticking to the plug and coming off my socket extension. Old plugs looked somewhat fouled and there was rust where the porcelain meets the metal. Noticed smoother idle and acceleration, especially when cold...its freezing here in Chicago! I would say over 60k it would be good to change. Advance Auto had the best price on Iridiums.

Post by **srv2nv** » Mon Feb 04, 2008 1:42 pm

I'm planning on doing my spark plugs this weekend along with a few parts that I've been collecting.

Anyone have any tips/tricks for removal/installation of the spark plugs? (ie. watching out for something that is in the way or should be removed or how to get anything out of a tight spot)

Also, whats a good spark plug to go with? In the past I've always gone with the Bosche Platnium 4's and have been happy with them. Do they seem like a good choice for the G35 aswell?

Post by **Tampa G35 Sedan 6MT** » Mon Feb 04, 2008 2:12 pm

Good to know

Post by **WESIDE** » Mon Feb 04, 2008 4:17 pm

Has any one installed the HKS Super fire raceing plugs. I am only at 20k on my 06' coupe but am ready to change the oem plugs out. At almost 23 dollars a plug they are pricey but are these worth the cost or am I just throwing my money away. Here is where I found them http://www.stillen.com/product...202DR

Wes|de

Post by **pae9132** » Mon Feb 04, 2008 8:05 pm

check this out everyone before you buy your plugs...The march 2008 issue of DSport tested the new "Pulstar" spark plugs on a 2004 g35 six speed and got just under 5 extra horses at peak but also got almost 10 extra at 5200 RPM. they had NGK Laser Platinum plugs from the factory before the test

Post by **WESIDE** » Fri Feb 08, 2008 2:53 pm

Bump. Anyone used the HKS plugs or have an opinons on these?

Replace your Sparkplugs!!! NOW!

Replace your Sparkplugs!!! NOW!

Re: Replace your Sparkplugs!!! NOW! (Kenrik)

Re: Replace your Sparkplugs!!! NOW! (SVTCOBRA)

Re: Replace your Sparkplugs!!! NOW! (SVTCOBRA)

Re: Replace your Sparkplugs!!! NOW! (Kenrik)

Re: Replace your Sparkplugs!!! NOW! (zozoka1212)

Re: Replace your Sparkplugs!!! NOW! (zozoka1212)

Re: Replace your Sparkplugs!!! NOW! (ACoupe)

Re: Replace your Sparkplugs!!! NOW! (Kenrik)

Re: Replace your Sparkplugs!!! NOW! (Kenrik)

Re: Replace your Sparkplugs!!! NOW! (BrandAidDesignG35)

Re: Replace your Sparkplugs!!! NOW! (Kenrik)

Re: (C-Kwik)

Re: (zozoka1212)

Re: (tollboothwilley)

Re: (tollboothwilley)

Re: (C-Kwik)

Re: (Road Ruler)

Re: (TeflonG35)

Re: Replace your Sparkplugs!!! NOW! (Kenrik)

Re: (C-Kwik)

Re: (Road Ruler)

Re: (srv2nv)

Re: (Tampa G35 Sedan 6MT)

Re: (WESIDE)

Re: (pae9132)

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