what type of plugs are recommended for greddy tt engine running 6lbs of boost??
brand?/where to buy?

also...while on the subject, any other precautions to be taken running 6-7 pounds????

 

NGK Platnium one heat range colder LFR6A-11. I forgot the gap we use. I'll check tommorrow. We have them in stock also. Just
PM me for price.

 

I got the Denso Iridium's! Hey T, Was supposed to pick up my car today and they said it wasn't finnished. Should have kept my fingers crossed huh. It figures.

 

yup...one step colde is sufficient. I have the NGK's that Dynamic6er mentions above. I used to have the Greddy two steps colder, and they were totally fouled and carboned up. I think they are too cold for street usage. I switch to one step colder and havent had any problems.

 

not to worry buddy were on it!

 

gq-626...what gap are you using ?

 

I am using the standard gap they came with. roughly .45

I know its a bit wide, but those NGK Iridiums are so dam hard, a was afriad to damage the electrode by forcing it...so I left them alone. The Greddy's were pre-gapped at .35

I dyoned 416whp after swapping plugs and plenum...no issues whatsoever.

 

I left mine at what they came with also...just wanted to know if ir was hurting performance

 

we've got the Denso Iridiums in stock if anyone needs em..in both stock heat range and colder (for those running boost)

 

The NGK Iridiums don't come in one step colder than stock... Does Denso make Iridiums one step colder than stock? I need to get the plugs tomorrow... I might just have to get the Greddy ones or the HK$ ones.

 

NGK does make a one step colder plug.....LFR6AIX-11 6619 www.clubplug.net

 

HKS and Greddy plugs are Denso Iridiums...just in a different box with a MUCH more expensive price tag

 

Actually, the Greddy Plugs are NGK plugs.....and yes....about twice the price.

 

Anyone running FI should use platinum. We find that the iridiums tend to break or be too brittle to be gapped properly. We've actually had quite a few Supra guys that have found they're missing parts of their plug when they pull them out. Not good but better then a broken motor

 

dynamic6er - that's the first time I have ever read someone endorse platinum for heavy hp FI - it is the poorest conductor of electricity for a plug.

I know we have used iridiums alot and never ran into an issue even on high hp machines - of course alot of this depends on what you are using as far as a coil. On my 280 ZX (uses an Electromotive ecu which has its own high power coilpacks) I use normal plain old NGK copper for purely economic reasons. At last check, I was even using stock temp plugs too (a tad under 600hp)

GQ - thanks for the clarification - I forgot Greddy used rebadged NGK.

 

Go two stages colder

 

Have always purchased and recommended plugs from "clubplug.net", but found the NGK LFR6AIX-11 plugs at www.vividracing.com at a very good price ($9.99). Plus, they are a my350z sponsor.

 

Just about everyone on this board is using one or two steps colder NGK, Greddy, Denos...etc...but all Iridium. Those that are breaking pieces of plugs...have much bigger problems...I think...like detonation. These are the best plugs for turbo applications.

 

I'm still running one step colder copper NGK's. I know too many guys that have had preignition using Iridiums with FI. Not 350Z's though.

 

When I detonated My #4 cyl. to its death . The plug lost its gap , but was intact.... NGK iridium