ATN: Modified ECU users

[rpruen]

Spark plug reomendations since the standard plugs run too hot:

NGK ZGR5B or ZGR5A

NGK BPR8ES

Denso IW24

Other manufacturers equivalents should also be fine.

Hope that helps

Richard

Edit to add extra parts 11/01/05

[martinholmesuk]

not another bloody spark plug change for me! I already have 5 spare sets.

Super 4's wr78
2 sets of NGK V groove (ZGR58)
and some blue plat ones.

[rpruen]

not another bloody spark plug change for me! I already have 5 spare sets.

Super 4's wr78
2 sets of NGK V groove (ZGR58)
and some blue plat ones.

spare == blody useless

Just bin the ones you will never use

Richard

[martinholmesuk]

2 sets are meant to be the good ones.

I tested all of these when car was running bad but now i think it's fixed so i could re-test them all.

[tobi480turbo]

Hi there,

at the moment I´m driving with original Volvo plugs but they seem to be a little bit hot ( looking white ) ... so think I´m going to test the NGK one´s tomorrow

what about the cables ?
are the original ones fine or are there any advances with silicone ones ?

regards

Tobi

[Jamo]

Spark plug reomendations since the standard plugs run too hot:

NGK BPR5ES or ZGR5B

That's all I have tried so far.

Other manufacturers equivalents should also be fine.

Hope that helps

Richard

You should be able to run BPR6ES as 5ES are 2 plugs colder than the 480 standard recommended BPR7ES although in reality BPR6ES were the ones should be used as standard.

Denzo iridium are also perfect 6IEX or something cant remember, dragon should have the number written down.

[chris1roll]

Jamo, the post is for the non standard turbo users, like me, I'm running BPR6ES and they are getting too hot (white)

For a standard car yes, 6ES would be fine.

[VanDerGraaf]

Spark plug reomendations since the standard plugs run too hot:

NGK BPR5ES or ZGR5B

That's all I have tried so far.

Other manufacturers equivalents should also be fine.

Hope that helps

Richard

Thanks Richard! Really should have thought of this myself but you know how it is with the car, one thing at a time- and with a complete tyre replacement and a possible fuel line leak plugs are one thing i hadn't gotten to yet!
Rohan

[rpruen]

You should be able to run BPR6ES as 5ES are 2 plugs colder than the 480 standard recommended BPR7ES although in reality BPR6ES were the ones should be used as standard.

Denzo iridium are also perfect 6IEX or something cant remember, dragon should have the number written down.

Jamo,

These are plugs for those using the modified ECU, so this is based on data collected from mine and Chris's cars. It turns out that 6es run too hot, so having tried a few types, 5es work out to be about right.

Running standard plugs, (7es) may actualy get hot enough to cause problems.

Richard

[480-Pelle]

Well, don't know how NGK plugs works for you guys, but for me the plugs is colder if the number is higher.
My brothers high-performance snowmobile ( 700 cc, 144 bhp ) uses nr. 9 plugs, very cold ones.
I have an old petrol-powered winch with a small crane, it has a very old 1-cyl Volvo Penta engine, this one uses nr. 5 plugs.

I copied this from NGK.com:

How do I find a colder or hotter plug?

First, consult the NGK numbering system page,(listed on the bottom left of the 411 info page), you should be able to see which digits identify the heat range for your spark plug.
EXAMPLE: The heat range for a BCPR6ES-11 is the "6" (ignore the -11, it is the gap)
After you have identified the numbering system for your plug, merely raise or lower that number to change the heat range.
REMEMBER, NGK PLUGS GET COLDER THE HIGHER THE NUMBER, HOTTER THE LOWER THE NUMBER.

Say you are starting with a BKR6E-11
if you want a colder plug, you would use BKR7E-11
if you want a hotter plug, you would use BKR5E-11
(again, on non-racing plugs, the number after the "-" refers to the gap)

Once you have decided on a number, test to see if it exists by typing that number in the part #search. If it exists, you can add it to the cart.

If it does not exist, you will need to contact NGK customer service at (877)-473-6767 for further assitance

RACING PLUGS ARE AN EXCEPTION
Any NGK spark plug that starts with an “R” is a racing plug (it is important you note we said it starts with an “R”, not that it has an “R” in it) For the NGK racing plugs, the heat range is after the dash IE: R5671A-10 is a 10 heat range. You can change heat ranges on racing plugs merely by raising or lowering the last digit.

If you are trying to go hotter on an R5671A-10
you would lower the last digit, you want an R5671A-9
If you are trying to go colder on an R5671A-10
you would raise the last digit, you want an R5671A-11

In the NGK racing plugs, there are some plugs in which 1/2 heat ranges are available. These are displayed as a 3 digit heat range. An example is an R6120-105, this would more readily be understood as a 10.5 heat range(10 1/2 heat range)

Have noticed this in the discussions on the forum, just don't want any of you guys to melt an engine...

//Pelle

[rpruen]

Ok that's strange

The Vgrove ones higher is hot. The normal plugs are the other way round.

Maybe I'd best check the plugs again then. But the hotter normal plugs seemed to work ok at least for the first 1k miles.

Thanks for that

Richard

[480-Pelle]

Ok that's strange

The Vgrove ones higher is hot. The normal plugs are the other way round.

Maybe I'd best check the plugs again then. But the hotter normal plugs seemed to work ok at least for the first 1k miles.

Thanks for that

Richard

I know some manufacturers have higher number=warmer plugs but I have always seen NGK as higher nr.=colder plug.

//Pelle

[tobi480turbo]

Hi,

as I know NGK is a little bit different ...
if 1 at bosch´s is cold it is the hottest one at NGK´s and the other way 10 ie. is the coldest at bosch it is the hottest one at NGK .... ( hope I´m not wrong/imagine right ).

And as I see the only plugs really working from NGK are the ZGS ones cause they have a longer electrode than the BPR6ES ones .. and the BPR6ES ones were realy running scrappy at mine´s

regards

Tobi

[rpruen]

Post at top edited

You don't want BPR5ES plugs!

The tips of the electrodes start to melt

BPR7ES or even BPR8ES might be ok, but as yet untested.

Richard

[chris1roll]

shit, just as well i haven't bought any yet.

What a stupid numbering system, I knew my plugs were getting too hot, i knew I needed colder ones, so why doesn't lower= colder

[VanDerGraaf]

does anyone know the Denso system for plugs ie- lower number = colder/hotter? Dragon?

Why is this such a non-standard thing!? Idiot manufacturers!

[rpruen]

does anyone know the Denso system for plugs ie- lower number = colder/hotter? Dragon?

Why is this such a non-standard thing!? Idiot manufacturers!

Higher numbers are colder for Denso plugs as well. Maybe it's a Jap thing?

Richard

[tobi480turbo]

Higher numbers are colder for Denso plugs as well. Maybe it's a Jap thing?

Richard

Hmhm,

maybe a possibility the NKG ones have the same system as far as I know ... higher number = colder spark.

regards

Tobi

[tobi480turbo]

Hi,

after having installed the modded ECU the NGK ZGR5B sparks seem to be getting to hot with the higher boost so at I have them replaced with NGK BPR 7ES sparks and and for now they´re working well.

I´ll probably give the denso sparks a try but at the moment my B20F(T) iss running very likely with the ECU mod .... feels somehow like another car while stepping at the accelerator

regards

Tobi

[basil.dgh]

After this long time
there is still a question to answer:

Hi there,

what about the cables ?
are the original ones fine or are there any advances with silicone ones ?

regards

Tobi

Cheers.