Just need to know the name of the plugs i should be using if running higher boost, eventually 21psi. ive got stock plugs at the mo and i think they may be blowing out, as it starts to misfire off boost.

how about the ngk higher rated plugs mate ?

 

dan will have them i think

 

Chris

they are the ones but i have no idea the code? and which one coz there are two?

i did have the codes somewhere will have a scout mate

 

but yeah there higher rated for extra mods etc

Jimmy i think the ones you need ie: (cooler plugs)

are NGK PFR6B-11B's but best double check with dan at DTA or somin first

 

Chris

Jimmy i think the ones you need ie: (cooler plugs)

are NGK PFR6B-11B's but best double check with dan at DTA or somin first

 

Chris

 

Thanks il have to wait for them to comment :D

im a fan of HKS they do different heat ranges depending on how modified your engine is

 

http://cgi.ebay.co.uk/HKS-SPARK-PLUGS-SET-OF-6-NISSAN-300ZX-HEAT-RANGE-8_W0QQitemZ270494809659QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3efabf3e3b

im a fan of HKS they do different heat ranges depending on how modified your engine is

 

http://cgi.ebay.co.uk/HKS-SPARK-PLUGS-SET-OF-6-NISSAN-300ZX-HEAT-RANGE-8_W0QQitemZ270494809659QQcmdZViewItemQQptZUK_CarsParts_Vehicles_CarParts_SM?hash=item3efabf3e3b

 

yep i spotted those earlier.....

NGK PFR6B-11B !

 

Stick to NGK imo, the only plugs specifically designed for the VG.

 

Has been discussed many times, all non stock plugs either stick out to little or to far into the combustion area of the cylinderhead .

The NGK PFR6B-11C/PFR6B-11B plugs have been specifically designed for our engines.

 

(right one is a stock plug)

NGK PFR6B-11B !

 

Stick to NGK imo, the only plugs specifically designed for the VG.

 

Thanks dave :D

that is a really interesting picture has anyone got a comparison of a NGK PFR6B-11C and PFR6B-11B plugs?

 

dan.:tongue_smilie:

 

NGK PFR6B-11B !

 

Stick to NGK imo, the only plugs specifically designed for the VG.

found this. http://www.300zx.net.nz/articles/MainLib/Theory/sparkplugs.htm

 

dan.:tongue_smilie:

Good find Dan, so.... i guess i will go for the one on the right, 11b.

 

Al.

i went ahead and bought the NGK heat range 7 :D cost me $64.99 from czp so thats £40 .....RESULT :D

 

the ngk PFR6B-11B is only good upto 18psi.. ist what ive been told.... im hoping to get 20-21psi

 

take a look

http://www.conceptzperformance.com/Cart/description.php?II=1163&Car_Type=300&UID=2009123011114282.35.131.32

 

Sport 530bb's specify the number 7's so thats what i did......

:wacko::wacko::wacko::wacko: never knew spark plugs could be such a technicall issue!!! lol

i went ahead and bought the NGK heat range 7 :D cost me $64.99 from czp so thats £40 .....RESULT :D

 

the ngk PFR6B-11B is only good upto 18psi.. ist what ive been told.... im hoping to get 20-21psi

 

Who told yer that mate?

Please remember the 6b-11b plug was specific to the US market to take into account different emmissions and ambient temps, that's why it's only available imported and NGK UK don't even stock it.

 

7 is very cold for a UK Zed, IMO i think you risk fouling the plug unless the car is being pushed hard, ideal for track use etc.

 

Also forget what PSI you want or hope to achieve, noticed you've said this quite a few times.

I've watched many a car being mapped, including my own whereby the boost is raised upto 20 + odd PSI, only to lose power. It's all a case of getting the balance right with everything else.

I run 18-19 PSI as any more and she lost power.

Good luck either way :thumbup:

smithy

Who told yer that mate?

Please remember the 6b-11b plug was specific to the US market to take into account different emmissions and ambient temps, that's why it's only available imported and NGK UK don't even stock it.

 

7 is very cold for a UK Zed, IMO i think you risk fouling the plug unless the car is being pushed hard, ideal for track use etc.

 

Also forget what PSI you want or hope to achieve, noticed you've said this quite a few times.

I've watched many a car being mapped, including my own whereby the boost is raised upto 20 + odd PSI, only to lose power. It's all a case of getting the balance right with everything else.

I run 18-19 PSI as any more and she lost power.

Good luck either way :thumbup:

smithy

 

ah bugger, so maybe just stick with 6 then :( Its hard to get the correct advice sometimes, ..... couldnt i gap the 7's to make them hotter then?

 

they also have heat range 8 and 9 which are even colder.... i didnt think ambient temp affected the combustion temp much anyway?

i am gonna go with the PFR6B-11B alot wiser folk than me reckon they work fine so in the light of better knowledge!:yes:

 

dan.:tongue_smilie:

id go with 7 and gap them at 0.6 mm ..

As boost is raised the gap should me made smaller.As smithy said that is a cold plug and you may get fouling when your not nailing the car.

As boost is raised the gap should me made smaller.As smithy said that is a cold plug and you may get fouling when your not nailing the car.

 

so could i widen the gap a bit to help a touch? maybe i should keep my 11b's in for road use and the 7's for track use. I think silverbullet said he was using number 8's and his is fine. baaa i duno

Seeing as you don't track every day or week mate, i'd stick with 11b's for everyday use and then wap in what ever you think for track days.

Not a big task swapping the plugs over.

 

smithy

Seeing as you don't track every day or week mate, i'd stick with 11b's for everyday use and then wap in what ever you think for track days.

Not a big task swapping the plugs over.

 

smithy

 

hmmm maybe your right, maybe il get it mapped with the 6's in then replace th old plugs?

TT Spark Plugs (6) NGK PFR6B-11B

PFR6B-11B

 

 

 

 

Recommended for virtually all TT Z32 applications.

 

Set of 6.

 

We recommend gapping these plugs to .035 if boosting 15-18 psi. Less plug gap may be required as boost level is increased. Aftermaket ignition amplifiers such as the AEM CDI2 sold here on 300zx.com will help in not having to gap the plugs down as far when running higher boost levels.

 

and thats what i thing is best bet.

text copied from z1 int.site .

This is what Specialty Z has to say

 

NGK Iridium Spark Plugs

 

For years we searched for the "right" plug for high HP, high boost applications on our own Zs. After testing numerous plugs we found the absolute best plug money can buy. Trying to find an adequate plug colder than the PFR6B-11B proved to be tough, but these plugs deliver the best spark around.

 

 

 

We offer these plugs in the heat range of 7,8, and 9.

 

Our recommendation for choosing the correct heat range:

 

 

 

Stock Boost Levels up to 15 psi: Stock Plug PFR6B-11B

 

"7" Heat Range: Stock Turbos (any boost level), Sport 500s. 530s, & 600s. Great for street use.

 

"8" Heat Range: For those who race at high boost levels and any upgraded turbochargers. Good for nitrous as well. Great for street use.

 

"9" Heat Range: Race use only! Great for high boost and nitrous use. Not recommended for daily driving.

 

All plugs come pre-gapped to .030", no gapping required!

 

 

 

Ive also read on 300zxclub.com that some are running iridium 7's as daily drives with no probs on stock turbos even....?!?! I know in the us the ambient temps are greater but not enough to really effect combustion temps?

 

 

 

 

 

 

 

 

some mpre info i found....

 

Q. Why are there different heat ranges? Which one should I use?

A. Part of your spark plug’s responsibilities, in addition to firing a spark, is to remove heat from the combustion chamber. This is accomplished by channelling the heat through the insulator material and metal housing. From there, the heat is transferred to the cylinder head where the engine cooling system can go to work. A spark plug’s heat range is its ability to dissipate heat. The colder the plug, the more heat it can channel out of the combustion chamber. In a performance application, colder heat ranges may be necessary to handle the extreme temperatures brought on by higher compression ratios, forced induction, and high RPM’s. While colder plugs may seem to be the way to go, please remember that the spark plug must achieve its self-cleaning temperature where it can burn off fuel and carbon deposits. Otherwise, the plug could foul out where it is prone to misfiring and poor acceleration. A plug that is too hot can overheat, also causing power loss, detonation, pre-ignition, and possible engine damage. A good, general rule of thumb is to start with the factory recommended heat range. For every 75 to 100 hp you add to your engine, you may go to the next colder step.

 

NGK and Denso use different heat range grading systems they are;

NGK Heat Grade Denso Equivalent

5 16

6 20

7 22

8 24

9 27

10 31

 

Stock TT

NGK - BCPR6EP-11 - gap to 1.1mm PLATINUM

NGK - BKR6E (2756) - gap 1.1mm

NGK Iridium - BKR6EIX-11 (3764) leave gap alone

Denso Platinum - PK20R11 - gap 1.1mm

Denso Iridium - IK20 - leave gap alone

 

TT @ upto 1bar

NGK - BCPR7ES (3330) - gap 0.9mm

NGK - BKR7E (6097) - gap 0.9mm

NGK - Iridium - BKR6EIX or BKR7EIX - leave gap alone

Denso Platinum - PK20R11 - gap 0.8mm

Denso Iridium - IK22 - leave gap alone

 

TT @ upto 1.3bar

NGK - BCPR7ES (3330) - gap 0.7mm

NGK - BKR7E (6097) - gap 0.7mm

NGK - BKR8E - gap to 0.7mm

NGK - BCPR8ES (3330) - gap 0.7mm

NGK Iridium - BKR7EIX - leave gap alone

NGK Iridium - BKR8EIX - leave gap alone

Denso Platinum - PK20R8 - gap 0.7mm

Denso Iridium - IK22 - leave gap alone

Denso Iridium - IK24 - leave gap alone

 

Big Twins @ upto 1.3bar

NGK - BCPR7ES (3330) - gap 0.7mm

NGK - BKR7E (6097) - gap 0.7mm

NGK - BKR8E - gap to 0.7mm

NGK Iridium - BKR8EIX - leave gap alone

Denso Iridium - IK24 - leave gap alone

 

Big Twins @ upto 1.8bar

NGK - BCPR8ES - gap 0.6-0.7mm

NGK - BKR8E - gap 0.6-0.7mm

NGK Iridium - BKR8EIX - leave gap alone

Denso Iridium - IK27 - leave gap alone

 

Big Twins @ 2+bar

NGK - BCPR8ES - gap 0.6mm ??? UNTESTED

NGK - BKR8E - gap 0.6mm ??? UNTESTED

NGK Iridium - BKR8EIX or BKR9EIX? - leave gap alone ??? UNTESTED

Denso Iridium - IK27 to IK31 - leave gap alone ??? UNTESTED

Edited January 3, 201015 yr by j1mmytt

Jimmy mate, at the end of the day it's your car and you driving it. We all think and take on board what we like.

I really respect the way you've worked with your zed and your big balls in trying things that others don't/won't :)

 

All i'll say is please remember stock for the US was a 6, for the UK it was a 5, so imo all numbers referred to above, for the UK should be less 1, but that really is my opinion fella.

 

A couple old links for yer but direct info from NGK here in the UK.

http://www.300zx.co.uk/forums/showpost.php?p=859825&postcount=4

At the end of the day mate, they hardly an expensive item to buy, so try what you think and change em as you think eh..

Good luck anyways

smithy