K Pazzo 6

iTrader: (6)

Is this true?.....Never ever heard of this brand? http://cgi.ebay.com/ebaymotors/aw-cg...374379&r=0&t=0

ZIPPIN

iTrader: (32)

uuuh no. but i have heard of them bfr. get a pop or cai for 6+ hp gain dude

theMax

the car has high miles and the spark plugs were probably bad,

by a tuneup with new plugs the car gained 6 hp that is lost with bad plugs.

you will not gain 6 HP with just new plugs.


In college we tested the splitfire and a few other brands and there was no HP gain on the dyno. Maybe some gas eficiency increase, but not HP.

59Hp just with plugs on a honda, they wish!

irvine78

iTrader: (2)

no..good plugs won't hurt ur performance(good set of plugs would smooth out the dyno curves) but won't give u 6hp...
but my stickers give me 5hp each..

Telus.net

Iridium does improve response of the car......

but gain only power if you change it from old plugs.

irvine78

iTrader: (2)

it's not just the iridium...
even a brand new set of normal plugs will improve reponse if you had shot plugs..it's just too much hype about the iridium..sure they last like forever..but that's not always a good thing..unless maintenance cost is a main concern for u.

SteVTEC

Not true, guys.

At least on the Accord V6 these plugs have been dyno proven to give some decent gains on the dyno, and much improved throttle response, esp at the low-end for us. One of our guys dynoed them and got the following results:

Horsepower
Peak Gains: 3 fwhp
Non-Peak Gains: 5-6 fwhp

Torque
Peak Gains: 7 lb-ft
Non-Peak gains: 5-7 lb-ft

I'm not sure about the Maxima and how they'd work on it since all cars are different, but at least on the Accord V6 they do help a good bit. In fact, we've made it part of our "BPU" package

AccordV6.com Link - The Denso Iridium Thread

Somebody here with fairly new plugs should get a set of these, do a baseline run on their good OEM plugs, swap these suckers in and then do another run for comparison. You might be surprised.

Maxilicious

As just an average consumer I would believe 5-10 HO. But 59?
"there's a sucker born every minute"

irvine78

iTrader: (2)

they're made for Hondas i guess...
it had no effect whatsoever on Maximas..

djPlayboy

Iriiridium basicly just sparks hotter also

irvine78

iTrader: (2)

hate hotter spark plugs..
me also opt for the colder ones..yeah, they don't last very long compared to the platinum or iridiums..but they're cheaper and serves me better~

Dario

iTrader: (1)

whats the difference in the hot and cold...and dont tell me one is hot the other is cold

irvine78

iTrader: (2)

nah..it's the temp of the spark...

Alexis

I hear the GS430 uses platinums too. Denso is a good spark plug brand. NGK has an iridium plug brand as well. The people on Toyota boards are happy with Iridium plugs, and Steve posted the much quoted info from an Accord V6. I plan to switch to Iridiums once I change my plugs, probably at 60k, but I probably wouldn't swap out a brand new set...

SteVTEC

ah well. then forget em!

irvine78

iTrader: (2)

we have no support..

Alexis

The hot or cold designation has nothing to due with the temp of the spark. Read about it here. The guy on ebay is selling ik16's which are the hotter version, ik20's are the other version. Both are recommended for the Maxima. I'm not sure what the stock plugs are rated as.

http://www.densoiridium.com/heatranges.htm

Sly

I think what everybody really wants to know is where to get them cheap so we can ALL try them out?!

BTW the "heat range" of a spark plug isn't how hot the spark is. It's basically how well the plug dissipates heat. NGK's web site has a good explanation.

emax02

iTrader: (1)

Thats correct. I remember reading a article a while back in import tuner, they dynoed about 5 cars and they all had good gains. The comparison was denso iridium VS new oem plugs. One car with a turbo gained 13FWHP(best gain) and the worst was 3.1 FWHP on I beleive a honda Civic.

Do you guy's think changing do Denso Iridium plugs would void my waranty?(my dealer say's a muffler would ) I may buy a set..

Maxima-Ness

You should be able to do a search. we have talked this to death about the densos. Im running them with an upgraded ignition amp and although my car doesnt feel more powerful, it seems to perform better.

The only quibble I have with what he is selling on ebay is the fact that the 5th gen need the IK16's, not the IQ16's pictured.

UMD_MaxSE

iTrader: (1)

are the Denso Iridium copper plugs? They would have to be replaced relativley sooner as compared to the OEM Platinum NGKs.

ZIPPIN

iTrader: (32)

it's not just the iridium...
even a brand new set of normal plugs will improve reponse if you had shot plugs..it's just too much hype about the iridium..sure they last like forever..but that's not always a good thing..unless maintenance cost is a main concern for u.
--------------------------------------------------------------------------------

perhaps u should spend some time reading

SteVTEC

I forget (probably knew at one point or another) but at least the ones I have are only rated for 30,000 miles of use. I think you can actually use them for around 60,000 or so, but after 30k maybe you just don't get better performance out of them anymore...

Sprint

iTrader: (10)

http://forums.maxima.org/showthread.php?threadid=45742

K Pazzo 6

iTrader: (6)

thanks for the info.....

paxus

I tried to view the following link from the very first post: http://cgi.ebay.com/ebaymotors/aw-c...0374379&r=0&t=0

But unfortunately that item is no longer available, and so is the information that may have been associated with it. So my basic question: has anyone here on these boards actually dyno'd their Maxima before and after getting platinum spark plugs and seen an increase in HP? I had no idea better sparkplugs would increase HP -- I understood you could lose HP with poorly maintained spark plugs, but never the former.

SR20DEN

iTrader: (7)

I plan to do a dyno test on the Bosch Platinums as soon as they come out for the VQ35. Right now I believe only NGK makes plugs for us.

karguy

NGK makes 2 plugs that work well in Maximas with the Nissan Direct Ignition System (NDIS): 1. The Ngk Laser Platinum Plug (often referred to as a double platinum plug because there is a laser welded platinum disc on the center and groungd electrode). 2. NGK has just come out with a new Iridium Plug which is a hybrid, it has an Iridium center electrode and a platinum ground electrode. I have been trying to get a set of these hybrid plugs, got part # from NGK technical support but have been unable to find a vendor who has them yet. The ideal plug would be a double Iridium plug but is going to be much more expensive, if anyone will do it. They would cost probably $35 - $40 per plug.
Be well!!!!

volkl77

I believe you are refering to a page at the Denso Iridium site ...What I found very interesting was the 13.5hp gain shown on the dyno chart from the Honda Civic...with a 300ZX Turbo engine!!! I suppose we can't blame him for trying

http://www.densoiridium.com/dynochart.asp?id=2

Maybe there's something to be gained with iridium. Trial and error will tell. My 96GLE is due for a new set and I've been trying to find an alternative to the platinum. Platinum as a conductor is not all that good. I don't think Iridium would be any better as the two elements are very close in nature. Nology Silverstone looked very promising but would likely cause EMI/RFI problems on 4th gens because they are non-resistor and the coil packs are too close. NGK V-Power would be a choice if I were able to determine what plug code for them. BKR5E???? could it be E, or Y? And what about the NGK plugs with the GV designation? A Gold/Palladium alloy could be the ideal. Thoughts?

karguy

DENSO recommends you replace their Iridium plugs at 30,000 miles!
You can verify this on their website. Could get a little pricey!

chinaonnitrous1

iTrader: (12)

hmm im gonnna hit 25000 miles in the next month....i think i should change plugs?..hmm....now..exactly what should i try for everyone?

volkl77

Ok..if you are willing... you can find the NGK Iridium IX plugs at www.clubplug.net
for $6.67/ea. About half the price of the Denso and NGK Platinum...I believe the correct plug is a BKR5EIX-11 (5464).
On the NGK Platinums.. one thing they are IS durable. I pulled the first set at about 31k and now the second set at 97k and you would be splitting hairs to tell the difference between them even though on has twice the milage...Yes I kept the first set for later comparision

chinaonnitrous1

iTrader: (12)

any other suggestions?..im proably gonna order plugs within the week..seeing that im gonna be at 25k soon.... Im guessing these Iridium IX plugs are better or equivalent to my stock. Seems like a good price too.

Jer

iTrader: (2)

Void your warranty? Not any different than changing to synthetic oil.

karguy

NGK has a new hybrid Iridium plug. The center electrode is iridium and the side eletrode is platinum. Cars with NDIS (Nissan Direct Ignition System) need a plug where both electrodes are either platinum, iridium or a combination of the two. I called NGK Corporate Technical Support to get the part number, I found the phone number on their web site. Once you get the part number you can go to vendor of your choice to buy them. I was going to buy them but I have only 3,000 miles on my current set of NGK Laser Platinums. I didn't feel like throwing that much money away to experiment. Your situation is ideal and it would be great to have someone on the forum try them. After all that is what the forum is all about.
Be well!!!!