High performance spark plugs [Archive] - SaabCentral Forums

: High performance spark plugs


SaabScott
8th April 2003, 01:06 PM
OK ... I've seen a few postings about spark plugs and every one of them seems to recommend using the stock plug over platinum plugs.

Has anyone tried the new Iridium plugs?
http://www.ngksparkplugs.com/products/cars_trucks_suvs/iridiumix.asp?nav=11420&country=US

I have used these in a couple of cars and they seem to work at least as well as the platinum plugs ... and the ratings seem to suggest they are better than platinum.

So, are there any reasons that I should not try these plugs?

oslowley
8th April 2003, 03:08 PM
Stick with the stock spark plugs. The manufacturers use them for a reason. Most competent mechanics wont even touch anything thats not stock.

Jeremy R.
8th April 2003, 04:02 PM
Some of the newer 9-3s and Viggens came with NGK platinum plugs from the factory. The concensus over on Saabnet seems to be that they work fine, but you need to take them out and regap them about as often as you replace the normal types.

philo
8th April 2003, 04:03 PM
I wouldn't write these plugs off altogether. They're made by NGK who are excellent manufacturers. If they recomend a variety for your particular engine, why not give it a try? Agree with oslowley though, the handbook advises use of a particular spark plug because that's what is already considered to give optimum performance for your engine. As a final point, clean, correctly gapped generic plugs will probably perform better than the finest in the world if these are filthy and gapped incorrectly.

SaabScott
9th April 2003, 08:14 AM
I understand that car companies use certain plugs for a reason, but they can only use what is current ... and since technologies are changing constantly (and improving for the most part), I'm just wondering if anyone has tried current plugs and if so, have they noticed any sort of difference.

If not, then I will do some further investigation before I install them myself (I'll keep a spare stock set on hand in case) and let everyone know how they work.

Mr Whippy
9th April 2003, 08:56 AM
Stick with the stock spark plugs. The manufacturers use them for a reason. Most competent mechanics wont even touch anything thats not stock.

Thats just dumb really, the iridium plugs available now, are better than stock items.

oslowley
9th April 2003, 03:41 PM
Its either you're ignorant, or you're ignorant. There's no reason to be acting like a child, if you have a point, state it and move on. The electrical systems on most new cars are especially sensitive, what is the purpose of having a hotter spark plug when not only can the car not utilize it but these same Godsend plugs can and probably will damage your cars ignition system.

oslowley
9th April 2003, 03:46 PM
On the same point, unlike Mr whippy the 2 post king, I am speaking from experience, the heat range of the plugs have to be compatible with the cars ignition system. On my 330 I decided to do the service myself and went to the neighbourhood autoparts store and bought the most expensive sparkplugs there, guess what 2 weeks later check engine light $1500 dollars of damage directly attributed to the plugs (oxy sensors , ingition etc.)

ERP
9th April 2003, 05:51 PM
This is quoted from a developer of the Saab Trionic Engine Management System.

Hi !
We have done extensive sparkplug tests in our labs, the result so far is USE ONLY NGK sparkplugs. For T5 cars use BCPR7ES-11 gapped to 1.10 mm if you have got a few extra horses under the hood. If the engine misfires at high boost, maybe reduce the gap slightly.
But, 1.10 mm has proven to work nice in a 300 bhp setup. And, yes, the plugs has to be replaced more frequently, then you get the chance do inspect "whats going on" inside the combustion chambers.

Since the plug is being used as a ion sensor, both the shape and material is important for the ion result. Incorrect ion current results in a false knocksignal, this can be either way, indicating knock without really knocking. Or even worse, NOT indicating knock when itīs knocking, as a result there can be extensive engine damage. This is the reason why you MUST use the correct brand and type of plugs.

So, please, do your selves a favor, trust the results from our labs, we have done the tests for you.....

SaabScott
9th April 2003, 06:10 PM
Not much to say to that ... but THANKS!
I'll stick to the stock ones ... no experimenting for me!

ragtopcav
9th April 2003, 06:23 PM
I've heard the same thing from an experienced auto-electrician, modern engine ECU design relies heavily from a feedback signal from the plugs, you must be careful what you fit. I would like to find out though how sensitive the V6 is to plug fitment as it is an engine sold through about 5 or 6 GM subsiduries, with differing part choice.

philo
10th April 2003, 08:26 AM
2 weeks later check engine light $1500 dollars of damage directly attributed to the plugs (oxy sensors , ingition etc.)

That's scarey :( Did you try chasing the spark plug manufacturer for compensation :-??

I'm still stuck with the feeling that if NGK (for example) recomend a componant for your car then it should be OK but agree with the principal that while technology moves on, you're stuck with technology in engine and componants that's at least as old as the car.

Tweek's Turbos
10th April 2003, 11:17 AM
Eric, on the other saab buletin board, Somebody has a ----List of mods. On his advice I replaced my plugs with the BCPR6ES-11 Which were in stock at my local Saab only dealership. I think the theory was colder heat range. Should I change them back to the 7ES?

oslowley
10th April 2003, 03:07 PM
I didn't persue litigation but i did call and they did the , "it must be your fault" brush off.

BlkTurbo
20th April 2003, 05:34 PM
I recently blew out my old DI cassette and I was told by my SAAb tech. that it was because of the plugs. I was using a slightly diifferent model NGK than I was supposed to. Stick to stock.

20Ted
20th April 2003, 05:55 PM
Thats just dumb really, the iridium plugs available now, are better than stock items.********* :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll: :roll:*********


They may be better for some applications, but the Saab Trionic system, along with the DI cassette, REQUIRES the construction and materials of the stock NGKs! So, in the Saab, the iridium plugs are NOT better than the stock...

SaabScott
20th April 2003, 06:10 PM
I just had the oil, plugs, and air filter replaced in my car yesterday ... and WHAT A DIFFERENCE!!!

I used the stock NGK plugs, gapped as recommended, and everything seems to be great.
The engine is idling smoother, acceleration is smoother, and every other aspect of the drive train has been improved.

Thanks for all of the feedback ... your advise has been taken!