Misfiring at high boost

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Nov 13, 2011 | 04:25 PM

#31

s2000Junky

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Joined: Jun 2007

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Quote:

Originally Posted by JoeyBalls

UPDATE

I am waiting on new 7173's so in the mean time I put in the NGK V-Racing 7405 (part number R5672A-9) Theses are my plugs for the Race Gas tune, and the misfiring is gone and with the slightly higer octane and cooler temps, the car pulls noticeably harder than before. The plugs were probbaly going south for a while

PS I had to hook my exhuast back up, lately the fumes from the Open Downpipe are actually starting to hurt my throat

I will just use the electrical cutout for now and run the open downpipe for the track or on Q16. I probably won't lose much HO if any, however the main reason for me running an open downpipe was the reduced EGT's (made a HUGE diff) For example after a pull with the exhuast hooked up it would hang out around 1200-1300, with the open downpipe WOT it barely breaks 1,100's and if it does it backs down to 800-900 within a minute!

Why would you go back to running the problem non resistor plugs you just pulled out

Any reason why your not interested in running tried and true 2668? Put these in and you wont have to worry about these causing you any issues for 50k+ miles. And they are resistor plugs!

Nov 13, 2011 | 04:47 PM

#32

JoeyBalls

Thread Starter

Joined: Jan 2008

Posts: 9,570

Likes: 3

From: New Jersey

^ I had these fresh in the box brand new. I think I wanted to stay copper because I could gap them down, I am not sure what the gap is on the IRDIUM plugs, I will look into it though,

I also think the non resistor plugs are f@#king with my EMS. It locks it up when I am looking at the live view screen while driving and its hit or miss if I am able to download the ECU datalog. I heard it might be because of my plugs

Nov 13, 2011 | 05:59 PM

#33

Spoolin

Joined: Mar 2003

Posts: 6,507

Likes: 51

From: Sellersburg, IN

Quote:

Originally Posted by sohc_mshue

Quote:

Originally Posted by Spoolin' timestamp='1320894207' post='21144000

[quote name='JoeyBalls' timestamp='1320886877' post='21143697']
thx guys, im using NGK copper plugs(7173), heat range 8's.I'm going to put new ones in, and get them gapped appropriately

You should ditch the 7173's. I switched to those from the iridium 8's a while back and had major misfire issues; switched back to the iridium 8's and it was gone. I'll never run another copper plug again; especially the 7173's.

Copper plugs are perfectly fine. You likely had issues because the copper 8's are non resistor plugs. The copper 7 bkr7e plugs are resistor plugs and do not have these issues.
[/quote]

With my power, it's not wise for me to run that hot of a plug so those won't work either. I ran the BKR7's when I was in the 400 whp range and they needed to be changed all the time because of rough idle. I'll stick with the iridiums.

Nov 13, 2011 | 06:04 PM

#34

Spoolin

Joined: Mar 2003

Posts: 6,507

Likes: 51

From: Sellersburg, IN

Quote:

Originally Posted by JoeyBalls

The iridiums come pregapped around .030" and I made 650 whp with mine at this gap on e85. I gapped them down to .018" now that I'm around 780 whp on e85, so you can gap them with no problems; I've been doing it for a long time.

Nov 13, 2011 | 09:31 PM

#35

s2000Junky

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Joined: Jun 2007

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Quote:

Originally Posted by JoeyBalls

You can gap the iridiums, you just need to be more careful. Use a pair of needle nose if you like. Anyway, yeah I'm not surprised if your having this trouble with the 7173. I kept getting false laser triggers on my radar detector when I tried them. Don't waste your time.

Nov 15, 2011 | 05:38 AM

#36

sohc_mshue

Registered User

Joined: Aug 2009

Posts: 876

Likes: 0

From: Richmond, VA

Quote:

Originally Posted by Spoolin

Quote:

Originally Posted by sohc_mshue' timestamp='1321195293' post='21152150

[quote name='Spoolin' timestamp='1320894207' post='21144000']
[quote name='JoeyBalls' timestamp='1320886877' post='21143697']
thx guys, im using NGK copper plugs(7173), heat range 8's.I'm going to put new ones in, and get them gapped appropriately

. I was just saying that all copper plugs are not bad. The only issue with the 7173 plugs is that they are non resistor. In fact I run iridium plugs on my own car.

I have tuned a large number of cars running bkr7e plugs and never had rough idle problems with them. They will foul quicker than iridium plugs though, but are also quite a bit cheaper.