Iridium or not to Iridium

[Mikelb]

I just took possession of my Talon last night... but I noticed it seems to have awful idle (No CEL) and a slight miss...

I know the battery is dying (car has sat awhile)... but I was told it has iridium plugs in the car... I have heard that these are terrible for DSMs...
I think it's time to change them...

The car is boosting 17psi on the stock turbo... what plugs should I get(same or 1 range colder)... and what gap should it be set at?
look at my sig for other mods...

[l_eclipse_l]

Iridium is OK, but not preferred. It works better in the N/T cars.

Get some NGK BRP7ES and gap them to around .028, and you should be good to go.

[kjewer1]

Platinum is what turbo car owners should avoid like the plague. Iridium is definitely ok. The EVO comes stock with NGK iridium 7s. They aren't really necessary though, mainly just good for longer life than copper plugs. Copper plugs are so cheap though, we should really all just be swapping them every 1 or 2 oil changes anyway. I run colder plugs, so I change them every 2500 miles with the oil. Only like 7 bucks for 4 of them, especially if you buy by the case. NGK BPR7ES should be right up your alley, with a 028 gap.

Edit> Just noticed eclipse already gave the plug type and gap info

[l_eclipse_l]

Originally Posted by kjewer1

Edit> Just noticed eclipse already gave the plug type and gap info

lol....

[Mikelb]

Originally Posted by kjewer1

Platinum is what turbo car owners should avoid like the plague. Iridium is definitely ok. The EVO comes stock with NGK iridium 7s. They aren't really necessary though, mainly just good for longer life than copper plugs. Copper plugs are so cheap though, we should really all just be swapping them every 1 or 2 oil changes anyway. I run colder plugs, so I change them every 2500 miles with the oil. Only like 7 bucks for 4 of them, especially if you buy by the case. NGK BPR7ES should be right up your alley, with a 028 gap.

Edit> Just noticed eclipse already gave the plug type and gap info

Well you guys, u just affirmed each other, so I feel more confident in the plug choice ... I was actually getting iridium and platinum mixed up... I was fearing for my dsm... lol... I don't feel so bad now though, I do think I have spark blowout though... b/c the car will boost up to say ~14 and then the car tops off... then I usually shift and let it blow off...

[defiancy]

Also, I was using some Denso's for a while and they weren't seating correctly with my plug wires, it's happened with another brand of plugs before. I only use NGK plugs and wires now because of the fit.

When I had those crappy plugs on there my car was doing some of the same things yours is doing.

[defiancy]

Also, I was using some Denso's for a while and they weren't seating correctly with my plug wires, it's happened with another brand of plugs before. I only use NGK plugs and wires now because of the fit.

When I had those crappy plugs on there my car was doing some of the same things yours is doing.

[Mikelb]

Originally Posted by defiancy

Also, I was using some Denso's for a while and they weren't seating correctly with my plug wires, it's happened with another brand of plugs before. I only use NGK plugs and wires now because of the fit.

When I had those crappy plugs on there my car was doing some of the same things yours is doing.

yeah, I talked to the guy, he drove it on 87 gas just long enough to get it to the shop (~20miles) and thinks that might've fouled the plugs... that or the car's hitting fuel cut... I always puss out when it does it, b/c I don't wanna mess the car up...

hey, pm me with paypal details and pics on that BOV... I want a different one (crushed stock for now)...

[Thor06]

I dont think spark blow out is the reason to avoid platinum in a turbo car. Turbo cars make much more heat than NT engines and IIRC it actually melts the soft platinum and it drips down into the cylinder.

[Mikelb]

Originally Posted by Thor06

I dont think spark blow out is the reason to avoid platinum in a turbo car. Turbo cars make much more heat than NT engines and IIRC it actually melts the soft platinum and it drips down into the cylinder.

No, I was meaning that I thought my (Iridium) plugs were blowing out... but that was incorrect... the BOV was messing up and not holding boost...
When they put the car back together, the vacuum hose on top of the BOV never got reconnected...

The car wouldn't boost over 10psi... put that hose back on, and the car's fast as hell

[ez1286]

Originally Posted by kjewer1

Platinum is what turbo car owners should avoid like the plague. Iridium is definitely ok. The EVO comes stock with NGK iridium 7s. They aren't really necessary though, mainly just good for longer life than copper plugs. Copper plugs are so cheap though, we should really all just be swapping them every 1 or 2 oil changes anyway. I run colder plugs, so I change them every 2500 miles with the oil. Only like 7 bucks for 4 of them, especially if you buy by the case. NGK BPR7ES should be right up your alley, with a 028 gap.

Edit> Just noticed eclipse already gave the plug type and gap info

My brother had some problems with iridiums in his 2g, it was only under WOT, he replaced both coils and wires several times, then replaced the plugs with some more iridiums and still had the same problem, at one pint someone suggested it was the iridium plugs. He switched them out for stockers and the problem was gone. It could have been the manufacturer though because he used the same one twice but i don't remember what brand it was. I feel iridium is pointless in reality, if it does work it's not worth the cost ($40 for a set vs $8 a set)

[l_eclipse_l]

Originally Posted by ez1286

I feel iridium is pointless in reality, if it does work it's not worth the cost ($40 for a set vs $8 a set)

I paid like $27 shipped for a set for my car...still like 3x the cost, but oh well they last a lot longer and I think it improved my gas mileage a little.

[kjewer1]

The problem with the iridiums may have been the gap. They are difficult to gap properly due to the nature of the plug. I ran them on the EVO down to 12.0 at 114, they seem to work fine for me. Who knows.

[ez1286]

Originally Posted by kjewer1

The problem with the iridiums may have been the gap. They are difficult to gap properly due to the nature of the plug. I ran them on the EVO down to 12.0 at 114, they seem to work fine for me. Who knows.

I wasn't disagreeing with you, i was thinking about that and i wonder if the evos had a higher charge for their spark. The plug my brother had were pre-gapped.

[kjewer1]

I've never seen a pregapped plug that I've been able to use. I always have to close the gap some. Most plugs are pregapped for NA cars. But if it was pregapped to the right value it may have been something else. I defintely wouldn't say that the EVOs have better spark either, crusty old 1g coils/ignitors are a big upgrade for the EVO! Go figure. I'm ont disagreeing with you either, just thinking out loud.