randeez
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2004 6.0 NV4500 Tahoe
- Thread starter Dantheman1540
- Start date
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Dantheman1540
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Got scolded by the tuner for using iridium TR5s. He said “the platinum/iridium plugs have a coating which keeps them clean longer but is more prone to misfires in something with a lot of timing”. He suggested copper tr6 gapped at .035 so that’s what I ordered.
Tonyrodz
Resident Resident
Isn't the factory gap a little bigger? Just curious--Why the different gap?
Yea, I think the factory gap is .042. Plus, what is "a lot of tune".
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Dantheman1540
Full Access Member
A lot of timing is mid to high 20*s, I think it hits 30* in a few spots. Factory lq4 tunes have like 6-8* of timing in the top end, it’s fairly pathetic.
Everyone likes a tighter gap………. To prevent spark blow out.
Tonyrodz
Resident Resident
That's what she said.
I knew a girl like that once........just once.
iamdub
Full Access Member
I was just discussing with my Tahoe Twin yesterday how the "old school" copper plugs were actually better performers, but last about 100K miles less. It's got me thinking that I'd probably be a good candidate for some copper plugs with how mine's tuned and with how little I drive it. I'm glad you shared the details. I've been trying to find something unnecessary to spend money on.
*EDIT* NGK #42-TR6? #4177?
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Dantheman1540
Full Access Member
That’s the ones! Plugs are so easy to do in these trucks it’s really not a problem for me, to spend $29.99 and 1 hour a year in doing the plugs. Since I’m not driving it 20k a year anymore I’ll probably do them whenever the heck I remember or something like every 20k.
How much timing are you running towards the top end?
