Iridium Plugs

[jss06c6]

Originally Posted by XfireZ51

Steve,

I'm using the the FIC injectors which are supposed to be balanced to within
+- 1%. However, did not have them flow checked.

Dominic, with new FIC's I wouldn't have worried, but recent experience with "aged" Bosch injectors told me to have them checked. Keith Tais at Fuel1 told me he had a heck of a time getting them cleaned up. He wanted to get them below 2%. As you'll see on the attached, they didn't quite get there, but very close.

I then match the lowest primary with the highest secondary for a cylinder pair. I continue this sequence until I have the highest primary with the lowest secondary injector. I then assign the highest combined flow rate pairs to #8 & #7, working my way forward to #2 & #1 which will have the lowest combined flow rate.

I also had them flowed at 50 psi vs. 43 psi.

Obviously you can't use injectors that are way off! My experience so far delivers nice fuel balance across the cylinders with optimal combined flow when secondaries are kicked in (or when running on engines with secondaries deleted). Bank to bank fueling seems to be closer as well (read BLM left and right) provided your O2's are good.20201102_055510.jpg20201102_060041.jpg

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[efnfast]

NGK TR7ix. Sorry, I guess there were two "as above" plugs.

[XfireZ51]

So what heat range are you all running? I?ve read that Iridiums run a bit hotter than equivalent copper plugs. I?m trying out BKR7Es right now which SOTP seems to like. Also appears to have helped w random knock.

[jss06c6]

Originally Posted by XfireZ51

So what heat range are you all running? I?ve read that Iridiums run a bit hotter than equivalent copper plugs. I?m trying out BKR7Es right now which SOTP seems to like. Also appears to have helped w random knock.

Moved from TR7 to TR6.. the 7's were Iridium, the 6's I just put in are copper core. Dropped gap from .050 to .045. Engine running great again. After having my Bosch injectors cleaned and flow tested, I'm having to lean out VE table since they are flowing about 4% more fuel. The balance between the heads is much better! I matched primary and secondary to even out total flow across all 8 cylinders.

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[XfireZ51]

Originally Posted by XfireZ51

So what heat range are you all running? I?ve read that Iridiums run a bit hotter than equivalent copper plugs. I?m trying out BKR7Es right now which SOTP seems to like. Also appears to have helped w random knock.

Hib,

As you can see from the quote, I stated I had read that equivalent iridiums ran a bit hotter. I interpreted that as having a hotter spark.

[Rodder]

Be aware of counterfeit NGK and Denso spark plugs when shopping on the internet. Try google fake spark plugs. Use an authorized dealer so you know what you getting.

Used FR1LS 035 and now Ngk bkr7e-11 044. Never logged to compare but runs fine with both and my driving style.


Thomas

[XfireZ51]

Originally Posted by Rodder

Be aware of counterfeit NGK and Denso spark plugs when shopping on the internet. Try google fake spark plugs. Use an authorized dealer so you know what you getting.

Used FR1LS 035 and now Ngk bkr7e-11 044. Never logged to compare but runs fine with both and my driving style.


Thomas

Thomas,

Have u looked to see how they are burning?

[Hib Halverson]

Originally Posted by Rodder

Be aware of counterfeit NGK and Denso spark plugs when shopping on the internet. Try google fake spark plugs. Use an authorized dealer so you know what you getting.

Used FR1LS 035 and now Ngk bkr7e-11 044. Never logged to compare but runs fine with both and my driving style.


Thomas

"Rodder" is correct. There are a lot of fake NGK and Denso plugs sold on the Internet. Solution: buy NGK and Denso from legit retailers of those brands.

[Hib Halverson]

Originally Posted by XfireZ51

Hib,

As you can see from the quote, I stated I had read that equivalent iridiums ran a bit hotter. I interpreted that as having a hotter spark.

A plug that is a hotter heat range does seldom means it makes a "hotter" spark.


Iridium tipped plugs in a given heat range do not run "hotter" than a non-iridium plug of the same heat range.