hows a tuner effect a cat?
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Road Master
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From: thomson, il
hows a tuner effect a cat?
have read numerous threads on efi tuners.. ied's, tfi and pcv as just a few examples but no one mentions if running one with a stock exhaust will cause a short life span for the cat. since it's running richer wouldn't it soot up and clog the cat?
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From: Ashland Ohio
If tuned correctly, the cat would be OK. (Afterall... it DOES work at higher RPMs that use 13 afr or whatever lambda equiv. is...) If one ends up with an overly rich low speed system (really fat during cruise)... then maybe something would come up.
MY thought is... if the tune is CORRECT.. then all is good. If one uses fuel adders instead of tuning... chances are it could be too fat.
Cats are NOT what they were in the 70s. Things have progressed a LLLOOONNNGGG way! On a ZO6... I wouldn't even bother to remove the cats. I'd say it's the same with MOCO bikes.
A little richer may cool them like it cools the rest of the exhaust?
Let's see what folks say, because I am El Retardo!!!
Oh... to the OP... xieds, PCs, tfi, etc are NOT tuners... those are add on devices that lose fuel control as a by product.
MY thought is... if the tune is CORRECT.. then all is good. If one uses fuel adders instead of tuning... chances are it could be too fat.
Cats are NOT what they were in the 70s. Things have progressed a LLLOOONNNGGG way! On a ZO6... I wouldn't even bother to remove the cats. I'd say it's the same with MOCO bikes.
A little richer may cool them like it cools the rest of the exhaust?
Let's see what folks say, because I am El Retardo!!!
Oh... to the OP... xieds, PCs, tfi, etc are NOT tuners... those are add on devices that lose fuel control as a by product.
Last edited by wurk_truk; Mar 29, 2011 at 04:15 PM.
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Road Master
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From: thomson, il
was told that more fuel thru cat ment more of a reaction.. hence the catalyst mo****r as being the third ingredient to help burn off excess unwanteds.. so in essence the catalytic converter would actually run hotter since it's working more. if enough excess fuel went thru it that it could actually cause a meltdown. this sound rite?
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Road Master
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From: thomson, il
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Road Master
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My cat had a very short life span. It went out with less than 600 miles on it with a little help from Mr. Band Saw and various other tools. Don't see any real advantage in running a fuel enrichment device with the cat in the header. The first thing most people who install xied's or PCV's do is to remove the obstructive POS cat. Bike sounds and performs better, plus runs cooler with its absence. I haven't heard of anyone who's experienced a cat failure from running richer. I would think it would have to be running rich to an extreme for that to happen.
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I am the rare duck that perfers to keep my cat in place (I have my reasons lol) and I have done a bit of research. If you add fuel and run a lot in open loop you will most likely have problems. If you mostly run closed look like most of us do probably not an issue. Piggy back tuners that essentially take closed loop out of the equation most likely not a good thing. I talked to Brian at Rev Perf and he said his EMS tuner is not to be used with a cat and he would not recommend it, dynojet said the same about the PCV (altho Jamie at fuelmoto said it was ok to run a cat with his PCV ) in the end I ended up going with a a TTS mastertune because the owner has my bike and my set up with cat in place and was actually able to explain how the TTS worked in conjunction with the cat to insure no issues. It just seemed like a better answer then "as long as you are not too rich you won't have a problem".
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A Cat will get hotter with richer tune. Fact of life.
If I had a Cat I would maybe leave it in if I was tunning a new bike.
I use TTS Mastertune on my 08 Fatboy. 98% of the time I am riding in the "Closed Loop" area of the tune. A little bias toward 14.2 AFR maybe. This is just the reality of the street.
Now and then the Cat just has to deal with the other 2-3 %
All out High Preformance is another issue. Loose the whole stock exhaust.
Today I don't know how that will fly someplaces.
If I had a new Tourer I would sweeting it up a little and just ride.
A Dana though--Oh My.
If I had a Cat I would maybe leave it in if I was tunning a new bike.
I use TTS Mastertune on my 08 Fatboy. 98% of the time I am riding in the "Closed Loop" area of the tune. A little bias toward 14.2 AFR maybe. This is just the reality of the street.
Now and then the Cat just has to deal with the other 2-3 %
All out High Preformance is another issue. Loose the whole stock exhaust.
Today I don't know how that will fly someplaces.
If I had a new Tourer I would sweeting it up a little and just ride.
A Dana though--Oh My.
Last edited by Old Gunny; Apr 1, 2011 at 09:55 AM.
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