my eyes hurt -what plugs for 500HP
 

Ok It is UNREAL the debates people get into about spark plugs

"I use this" " no a better choice is this"

blah my eyes hurt after searching thru threads

To the point
I plan to get my car to the dyno late this coming week

I have been using the BUR9EQ's all around with no issues
been pushing 15PSI on a 67mm turbo on 93 pump
(premixing) 10.7-11.3 A/F depending on outside temps

Now I want to run 22+ PSI
Will Dyno on C16
to make sure things are safe

SHould I switch to a diffrent plug set up?
or would it be fine with a fresh set of the same 9's combo

If not, what spark plugs should I buy for my tunning session?

I talked to Ari for over 2 hours about this very subject not too long ago. Bottom line: Run NGK or Greddy race plugs (10.5 or 11.5 heat range, take your pick) in all 4 holes for the power levels you plan on making.

NGK 6725-11.5 all aroundIve run them to 28 psi no problem. Carl

Is this the PT67 .81 GTQ????? :D

is there any need for any plugs other than stock for around 400-450 rwhp?

paul

NGK 6725-11.5, I have been using these for a about a year now..They work well on a street car even with the cold rating, they seem to resist fouling more than the standard surface gap plugs..To be honest, these were the hot sellers it seems in Japan for people even with stock cars, the standard 7's and 9's werent even sold in alot of places, everyone sold the race plugs..
I have been running these with a msd, they burn down awefully quickly with a multistrike ignition, I kinda thinking the twin power style ignition systems, or the oem ignition is better choice than the msd or other multistrike boxs for these plugs.. These plugs are 33.00 US a peice retail...Bend over....If you buy them directly out of Japan, they are about 16.00US a piece instead..max

holy crap!!!! not worth it!!!! guess ill just stick with the b10egv's.

paul

More dependent on boost...
For stuff over 20psi, you're basically stuck with the 10.5's or colder plugs. :(


-Ted

I second the NGK6725's, best plug I have used. Even better than the new EIX iridium plugs that are similar to the EGV.

The 6725 is a bit cold so tune that motor to idle, cruise, and boost on the leaner side of rich. And don't even think of starting the motor just to back the car out of the garage, need to warm the plugs up quite a bit before killing the motor.

"I have been running these with a msd, they burn down awefully quickly with a multistrike ignition, I kinda thinking the twin power style ignition systems, or the oem ignition is better choice than the msd or other multistrike boxs for these plugs.. " ----Maxthe7man


Maxthe7man, i am considering switching to msd boxs on my next motor, would you advise that??

so which ones?

the 10.5 or the 11.5 range

the 11.5 are colder then the 10.5 is that correct?

I can get them here locally for $105

:D :D

yes the higher the number the colder. just go as cold as possible if this is a race setup. just use the hotter plugs you got now when your on your pump tuneup just driving on the street. then you can just swap in the race plugs whenever you need.

Roger, talk to Juan, he runs some two cycle motorcycle spark plugs. People in Puerto Rico live and die by them. Speaking of spark plugs I just changed my plugs yesterday. You know what that means? I'm dynoing my car probably Friday. I'm not sure if I'll have the money to tune though.

Since a race plug has a shorter projection, and shorter nose it starts with less material in the first place. I usually get almost a season out of a set with 3 MSD6A, and stock TII coils

13's won't start below 35 degrees or so. They also foul pretty easily. Dirt cheap if I remember correctly though.

Kevin T. Wyum

I find it's better to tune your idle with a hotter plug(9), trying to dial in the idle with an 11.5 is a bitch. Once idle is tuned, 11.5 all the time are fine for the street or track. I never had problems fouling even with 10.0:1 AFRs and 15 psi.

A while back, I thought I read that Crispeed recommended the BR10EIX plugs w/ .18 - .22 gap....

I've been told I should get my car tuned with B10EGV's

("tune for what you would use on the street")

Instead of having to switch plugs for "track use only"

I'm going to go ahead and get the car tuned on high boost with the B10EGV's

I've read here people using the stock 9's all around and where able to hit 500rwhp+

like AJC13B for example ran

so the B10's which are even colder then the 9's should do the trick
all depending if your ignition system is up to the task, I would assume
which mine is

will see soon enough

I post the results after this coming weekend :D

so what about street/ race app.? with around 450-500? still race plugs? (ngk 6725 in all 4)

what ecu are u tuning? the pfc?

That surprises the hell out of me. I wouldnt recommend it. One advantage of the colder plugs is that they inherently help prevent detonation.

Re: the b10egv's, (as per my convo w/ari) i am not using them for high boost. The electrode is nice and tiny, but there is that huge finger hanging down over it. Ari recommended against it mainly for that reason. This seems to be a bit of a black art, but i dont mind the cost to the race plugs.....$25 a pop for the 2 leading on a car I hardly drive, I can swallow that.

E6K. I ALWAYS run 100 octane or higher. Once the idle and lightb throttle are dialed in the 11.5s work fine on the street, and as Goodfella pointed out they lack the "finge" which makes the "10" prone to pre-ignition due to the electrode staying hot too long.

I never had problems with the b10egv plugs causing preignition and i was running anywhere from 17psi - 20psi on 93 octane every day for a year with those plugs. They ran better and were more smooth than any of the other plugs I tried including stock 9's all the way around. One reason I like them is you can adjust the gap and run a different gap for different situations. Chris Anderson puts them in all of his cars and his customers cars....thats enough for me lol.

Anyway, plugs are one of those things that everyone has a difference of opinion on. Just get what you want and try them out to decide for yourself.

If nothing else you should try B10egv plugs, they are cheap and you can get them from any parts store...if they arent in stock they can ususally have them the next day. Gap them to .023 and try them out. If you like them...run them. If you like HKS, Greddy, NGK plugs better....run them.

my .02

Kabooski has some pretty exciting news. I won't spoil it for him, so I'll let him tell everyone ;)

I ran the 11egvs for a while but under high boost, 30psi I had the electrode tip start to mushroom from heat so I went to the 11.5 6725s and have had no more problems. I run
114oct all the time and have twin hvcs firing the leading plugs with no idle problem at all.
The one nice thing I found with the 11.5 rotary style plug, ypu can clean it over and over again. I only use one to two sets a year.