408 tuning with a Wideband sensor

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Looks like a BKR6E would be one step colder. I'll pick up a BKR6E and a BKR7E tonight and throw them in different cylinders to see the difference. That way I'll have a 5, 6, and 7 to compare side by side.
 
Loosenutz said:
I've been reading some articles and it appears that i need a colder plug. Anyone know the next step colder from an FR5?
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[ame]http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf[/ame]
 
dbl post[ame="http://www.ngksparkplugs.com/techinfo/spark_plugs/partnumberkey.pdf"][/ame]
 
Picked up the 2 test plugs. The numbers I posted previously were wrong. I got a BRK6E and a BRK7E. Pretty sure the 7 will be too cold but you never know. I'll test her out tomorrow.
 
Checked the plugs after a little cruising and I like the look of the 6. The 5 just looks like it's too hot. On a sidenote the FR5s that were in the car for about 30 miles now are showing signs of still being rich which the wideband confirms. From what I've read, the ground electrode shows there is too much timing but i checked it again tonight and I'm peaking at 32-33º So I threw a set of the BKR6E in it and I'll put some miles on. Pic is of a FR5.

20130612_182623.jpg
 
By the looks of the base where the threads end it is still rich. I've heard this area shows the mixture at cruising speeds. The O2 sensor is in the header collector and there there are zero leaks in the exhaust before it.
 
Loosenutz said:
By the looks of the base where the threads end it is still rich. I've heard this area shows the mixture at cruising speeds. The O2 sensor is in the header collector and there there are zero leaks in the exhaust before it.
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"Ideally the o2 sensor would be just a bit before the collector flange (ie, in the header). Reason being that a leak at the collector flange can screw up your readings if the sensor is behind the flange. Of course you may not want to tap your brand new TTI's for an o2 bung and burn off your nice coating welding it in, so after the flange is where a lot of them end up. Just keep in mind if you're readings don't seem to be matching up with what your engine is telling you, check the flange gasket.

Having a bung on each pipe of a dual exhaust isn't a horrible idea. You don't have to use both of them at the same time, you can plug one and use the other. Just gives you more diagnostic ability, especially with a dual plane intake. The o2 sensor will tell you more than just how to tune your fuel, it can also help diagnose ignition problems (incomplete burn), etc. If you can isolate that to one bank or the other using the o2 sensor it can help speed up troubleshooting in some cases."
 
I've got the reusable copper collector gaskets. Last time I had the exhaust off there was no sign of leaks. I wanted to put the sensor in the header but couldn't bring myself to do it.
 
I've thought about this too, I have my o2 sensor behind the collector flange also, same thing, couldn't bring myself to tap my TTis. If it was leaking outside air into the exhaust wouldn't that cause for a faulty lean reading instead of rich?? that what I would think.
 
I should also mention that these plugs only saw cruising conditions with light to moderate acceleration. I've yet to do any WOT pulls. I need to change my clutch disc before I can do that. Damn trans leaked oil on it and now it won't hold the power.
 
nice read. whole lotta info. hows the car runnin thus far?

I PM'd you about those bushings as i would like 2 of em as well. :)
 
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