MattZeeTerror

What is best spark plugs for a 3rd Gen with BPU?

HWO

NGK B9EGV in both holes

Boostn7

How about the NGK B10EGV ???

what gap do you recommend when running this type of plug at 22-25 psi of boost ???

John D.

Grimlock

what would be the best plugs for an 88 TII.

i have the stock ones now but 9's all around.

ErnieT

iTrader: (2)

I can tell you what NOT to get. Do NOT get any HKS POS irridium plugs. I've blown 2 motors with them. One time they fouled and shot into my engine! Your best bet w/ a BPU RX7 would be NGK Racing plugs w/ a heat range of 10.5.

HWO

Yip as that boost/HP levels then B10EGV's are the way to go, i think 0.2mm is the right gap.

AJC13B

Run stock plugs.

As for the T2, BUR9EQs are fine all round.

RICE RACING

Yes run them, if you do not want the best !

NGK racing plugs are the best RA series for power and reliability (I have not noticed the power bit to a great enough degree) but .... if money is not an issue then these plugs are the way to go.

B10EGV will suffice for side port engines in almost all road and race cars (not used for endurance work).

Stock plugs just do not cut it, sorry.

And those are the facts to answer the question "which is THE best plug" NGK racing RA4468 105 to 115 is the best plug.

Which is the best value or what do some people get to work?, that is another question altogether

RICE RACING

0.2" or (inch) is the right gap, this is around 0.6mm.

Engine WILL run alot better (smoother) on these plugs as apposed to STOCK BUR plugs, have never seen an engine perform worse, when I have changed the stock type plugs for these...but everyone has an opinion, this is just mine based on around 20 different cars.

AJC13B

11.1 @ 125 isn't good enough? I made 510+rwhp (440rwhp on DTS dyno) on 22psi with rich mixtures and C16 with the BUR9EQs lead and trail. I made 410+rwhp 363rwhp on DTS dyno) on 15psi with BUR7 and BUR9EQs lead/trail (or whichever way) and pump fuel.

My tuner recommends them, the guy that made my ECU recommends them. I have seen a 12A turbo make 360rwhp on 19psi and pump fuel before the fuel pressure ran out on BUR9EQs all round. A good mates 323 panel van ran 11.9 and made 272rwkw on 17psi, high flowed S5 turbo and C16 on BUR9EQs.

B10S are a decent plug for race applications, but for a daily driven car they aren't too good. They are too cold a plug and are a bitch when the car is super cold, such as a North American winter. I will only run the B10s when I got back to the track and pump 25psi and C16 through the engine.

I'm sorry, but you have said before that they aren't the best, and I disagree. My car has run numbers and made the power to back me up when I say those plugs are good.

Yes, everyone does have an opinion. This is not my opinion, this is the opinion of the people that know best for me.

In short, if you want to know whats best for YOUR engine, listen to your tuner or engine builder.

RICE RACING

Yes and again, BUR's are not the best ! .... how hard is that to understand ?

They are proven to run rougher, misfire due to large gaps between ground and centre electrode.

They are not a high enough heat range, for racing.

For you they work ? for most rotary engine racers in the world they are ****, I happen to think they are ****, and would not run them at all for the reasons I have stated before.

I run them (EGV's) 9's in a factory SP rx7, and there was night and day difference in the way the car ran due to being able to control the plug gap... something you cannot do with stock BUR plugs.

Race plugs, that I mentioned have precise gap control, early modle surface discharge plugs did not have this . They do not run as well, it has been proven MANY MANY times by lots of reputable companies that the NGK RA series (single ground & centre electrode) racing plugs are best. SD "large gap" are old tech and cannot perform as well under all conditions.

EGV's perform best under the "bang for buck" scale, again many people run quicker than you do Steve, and guess what ? they run B10EGV plugs.

Just cause you run them (BUR's stock plugs) does not mean that they are the best solution.

AJC13B

At any point did I say the BUR plugs ARE the best? I can't find any mention that they are the BEST plug for rotors from me, can you?

You say they are proven to run rougher and misfire due to plug gap. The only person I have heard complain about these plugs is you. I run them in my engine and have done for nearly a year. I have never had a problem. As you stated, everyone has an opinion which is based on experience, my experience and opinion is that the BUR9EQ plugs are fine.

The original question was "WHat is the best plugs for a 3rd Gen with BPU". My answer was stock ones.

Next question I answered was "what would be the best plugs for an 88 TII. i have the stock ones now but 9's all around." My answer was BUR9EQs are fine all round.

Did you see anywhere, ANYWHERE, a mention of race applications? The original question was "WHat is the best plugs for a 3rd Gen with BPU" not "what are THE best plugs". If that was the question, I am 100% sure that the NGK racing RA4468 105 to 115 wouldn't be mentioned anywhere in Mazdas pit lane at Le Mans....

Mazda use the BUR plugs in the car from factory. Correct? I would suggest there was something else wrong with the car if there was "night and day difference" between the way the car ran with and without the surface discharge plugs if they come factory with those plugs, wouldn't you? If these plugs were so good and has been proven that they are better than factory, why not run them factory? If the car runs better and is smoother, surely Mazda would look past the fractional price difference to get their cars running alot better?

And yes, there are people running quicker than me using EGVs, and there are people running slower than me running EGVs, your point is?

95R2-89TII Ground Zero

NGK plugs are the best. Thats all I have run in both cars, and recently I got my boy to run them in his Corrado. He told me that it runs so much better with them in it. It is smoother and it seems to accelerate better.

RICE RACING

My point is, that the race plugs I mentioned and EGV's are much better than stock BUR plugs.

You can buy them in a heat range to suit your application or driving style and they run smoother. Just because you have a problem with what I am saying does not mean you should get on your high horse and say that stock is best. Sure you have them working on your car, that's great for you, it does not mean they are the best just cause you use them. You cannot accept that EGV's run smoother, that is your problem. I do not need your suggestions saying that there are other problems (in the example I gave)! ........ I work on these things EVERY day mate, I understand more about the physics of these systems than you, your tunner, your ECU maker, put together then multiplied by a factor of 10 !

They clearly are NOT the best plug for ANY application, period. I do not recommend using them at all.

ONLY use BUR plugs if you want your car to run rougher and make less power, is what my experience is .... but you make the choice, listening to me and steve debate which is best is going nowhere in a hurry.

These are my facts on the subject.

I have personally trialed MANY types of plugs, stock, EGV's,EG,BOSCH, CHAMPION, and proper NGK racing plugs.

I HAVE personally used these (many of them) in over 20 different turbo 13B's ranging in output from 250bhp to 830bhp, In every single case, the worst plug I used was the std BUR series plug ! ...the best plugs I used were the racing NGK's and the NGK EGV's, by best I mean smooth running, economy, power, and, less misfires.

In every controled test, there was no other issues at play, as steve may think, I was analysing PLUG performance, what I determined is that BUR plugs are the lowest in my choice of plug for any application from stock to race.

I have never had a customer or fellow enthusiast come back to me and say that there car had gone worse when changing stock BUR plugs for EGV's ! NEVER EVER. I have numerous e-mails from people all over the world who tell me that they wish they changed to EGV's earlier because they run much smoother than stock BUR plugs ! ..... The same applies to cars I tune, If I had a dollar for everytime someone said how much better there car ran with EGV's I would be a rich man by now.

The_HITman

Boys , boys.... surely there are better things to argue about than what spark plug is best. BUR plugs work for AJC, EGV and R-series work for Rice. IMHO, they all work if the car is running properly. AJC runs a stock ignition with no CDI units, and still manages big HP from stock plugs and coils. Others are not so lucky, but it shows that with everything set correctly that they run fine.
Spark plugs are cheap compared to an engine. Why not buy a set of them all and see what works best for you. If you cannot pick a difference then there is no difference. Just make sure to get the heat range right, and as usual, if the engine does not feel right then back off the throttle.
Personally, I use either type. For street use I find the BUR's to run good around town. If I am going to be pushing the engine hard I would go for one range colder and maybe switch to an R-series or maybe an EGV if I cannot be bothered chasing the NGK man. I believe the NGK B9EGV is a good alround plug to recommend to someone who may not have their engine running 110%, and yes a slightly smaller gap will help. I have never seen an engine running significantly worse from having too small a plug gap, whereas a large gap will cause all sorts of problems.

Splinemodel

Question about NGK Racing plugs vs. 9's:

Are the racing plugs better in every way? I've read something about them being "lower temperature." What effect does this have on emissions and fuel economy? (I'm more concerned with emissions).

If they simply ignite the fuel more effectively, then the $100/set doesn't seem to be such a bad idea. Or is the difference between racing an 9's negligible at stock boost levels?

Thanks.

Heath

iTrader: (11)

What do you recommend for a t-78 with Haltec and 550/1600cc injectors?

Boostn7

OK... I've made over 500RWH with new BUR9EQs all around and that's running MSD boxes w/ stock coils, ~24psi boost and race gas. Therefore for... $20 for a set is GOOD.

While still on the dyno I tried the NGK 11.5 and B9EGVs

-NGK racing-11.5 showed a 11 RWH gain (gapped as purchased)
-B9EGVs showed a 9 RWH gain *but* misfired ~ 7krpm under full boost! checked the gap and it was @ .3 or .35" as purchased.
Since I never gapped I was told to run .25" or possibly .2". I never had a chance to re-test them with correct gap.
Funny, I never gapped a plug for my rotary before

I will agree with Rice Racing.... as you up the boost/hp you will need a colder plug and obviously there's gains with race plugs.
The gap on the BUR9EQ will increase as they wear and eventually loose some performance. On the bright side, you could buy a set cheaper then one single race plug


Later,
John D

AJC13B

At any point have I said I have a problem with what you are saying? No. Have I disagreed, but given reasons for my disagreement? Yes. Have I got on my high horse and said that stock are BEST? No. Have I given my opinion based on my experience? Yes.

Have you got on your high horse and said you know more than HITman and more than engineers at Haltech? I'll leave that up to you.

Its a shame that a decent discussion had to get into a "I know more than you" battle.

Yes as you lean on an engine harder and harder its time to step up your plug choice, not once have I said anything to the contrary. But once again I come back to the original questions which I answered, best plug for a S6 with BPU and a stock S4. Stock are fine. You want to spend more money on plugs than you need to? Go right ahead. You want to disagree for a stock car? Take it up with Mazda, don't get your back up with me about it.

Prowla RX7

well, how about for the 2nd gen n/a? just wonderin

machinehead

Any of you ever have a problem with the EGVs on cars with a knock sensor like the 3rd gen? It seems that ever since I put them in my car my knock sensor is going crazy when I know there is no knocking going on. I was told that becasue the EGVs are non resistor plugs they might be interfering with the knock sensor signal.

kliftin

I think us n/a people dont have to worry about it. 160hp . your not going to tell the diff.

Node

iTrader: (1)

lol

89turbo2dutch

I've been running the EGVs for 2000 miles and had no problems whatsoever!!

Mike

13BAce

I've been using NGK BUR9EQ's on my car, and it has been running well. All 4 cost me about $6 at Pep Boys.