Pc-v question........
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Road Master
Joined: Jun 2008
Posts: 949
Likes: 1
From: Louisville, KY
Pc-v question........
which cylinder is cylinder 1?
I tried exploring the CD that comes with the unit and I am unable to use the software tutorials on it to see.
The reason I ask is because the rear cylinder seems to be running leaner than the front. I can tell by the way the ends of the mufflers are turning color (new Bub 7s) the right side is turning black and the left (rear) is turning golden brown color.....the spark plugs are depicting the same as well.
I thought the rear cylinder would run a little more richer than the front for cooling.
maybe I don't know what I'm talking about.....
I tried exploring the CD that comes with the unit and I am unable to use the software tutorials on it to see.
The reason I ask is because the rear cylinder seems to be running leaner than the front. I can tell by the way the ends of the mufflers are turning color (new Bub 7s) the right side is turning black and the left (rear) is turning golden brown color.....the spark plugs are depicting the same as well.
I thought the rear cylinder would run a little more richer than the front for cooling.
maybe I don't know what I'm talking about.....
Road Warrior
Joined: Jan 2008
Posts: 1,549
Likes: 18
From: Upstate SC
True but it really depends on how the PCV was connected. If you connect as per the instructions then this is true. If you accidentially swithced them around then the map would be making the front run richer and the rear leaner. Just a thought
Last edited by JustDennis; Jul 8, 2009 at 11:49 AM.
Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
Very good point. I'm not looking at the instructions to be sure about this, but I don't think there's any way the basic PCV can be connected wrong since it basically involves just the ECM and J1850 connectors. If you add the AT modules you could definitely connect them backwards by swapping the modules, as they are dedicated and marked for a specific cylinder.
Last edited by iclick; Jul 8, 2009 at 04:13 PM.
Thread Starter
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Road Master
Joined: Jun 2008
Posts: 949
Likes: 1
From: Louisville, KY
Its not the PCV or the uploaded map IMO......I have always felt the bike was running leaner on the rear cylinder running with the stock ECM and exhaust. even after I switched to the true duals and before the PCV (hadn't changed the stock AC yet) seemed the rear cylinder ran hotter than the front (compairing plugs) and by seat of pants. now with the stage one AC and pcv the plugs are still the same as before, rear seems leaner than front....so I wanted to dabble with adjusting the rear AFRs to richen it up a lil. thats why I asked which one was front and rear....
you think theres something wrong with the stock ECM? I always thought the rear was suppose to be a little richer than the front for cooling. mine seems to be the oposite.....or maybe I just need to leave well enough alone...lol
you think theres something wrong with the stock ECM? I always thought the rear was suppose to be a little richer than the front for cooling. mine seems to be the oposite.....or maybe I just need to leave well enough alone...lol
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Extreme HDF Member
Joined: Sep 2005
Posts: 11,615
Likes: 50
From: Baton Rouge, LA
Bad Pig, if you can get hold of an infrared thermometer take some temperature readings near the base of the spark plug on both cylinders. That'll give you an indication of how hot each head is running, but the rear head should always run hotter than the front. Mine usually stays around 50° hotter. If you are seeing a difference on the spark plug you may have a vacuum leak, most likely at the intake manifold. Spray some WD-40 or brake cleaner on the manifold where it attaches to the each head and if you hear a change in RPM's you have a leak.
On my bike I see that it runs richer on the front cylinder for most cells but not all, mostly richer in the cruise range. That makes little sense to me since the O2 sensors on a stock bike will keep both cylinders near-equal at all times up to about 50% throttle.
On my bike I see that it runs richer on the front cylinder for most cells but not all, mostly richer in the cruise range. That makes little sense to me since the O2 sensors on a stock bike will keep both cylinders near-equal at all times up to about 50% throttle.
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Thread Starter
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Road Master
Joined: Jun 2008
Posts: 949
Likes: 1
From: Louisville, KY
Bad Pig, if you can get hold of an infrared thermometer take some temperature readings near the base of the spark plug on both cylinders. That'll give you an indication of how hot each head is running, but the rear head should always run hotter than the front. Mine usually stays around 50° hotter. If you are seeing a difference on the spark plug you may have a vacuum leak, most likely at the intake manifold. Spray some WD-40 or brake cleaner on the manifold where it attaches to the each head and if you hear a change in RPM's you have a leak.
On my bike I see that it runs richer on the front cylinder for most cells but not all, mostly richer in the cruise range. That makes little sense to me since the O2 sensors on a stock bike will keep both cylinders near-equal at all times up to about 50% throttle.
On my bike I see that it runs richer on the front cylinder for most cells but not all, mostly richer in the cruise range. That makes little sense to me since the O2 sensors on a stock bike will keep both cylinders near-equal at all times up to about 50% throttle.
I'll check for a leak....I don't have a infared thermometer handy. I do get what your saying though....maybe I'm too critical. i just don't understand why the right side (front) muffler end is black on the inside and the left (rear) is a golden brown color. I don't have the cash to drop down on an expensive dyno tune right at the moment
that would be the best choice i know
Road Warrior
Joined: Jan 2008
Posts: 1,549
Likes: 18
From: Upstate SC
that makes sense.....
I'll check for a leak....I don't have a infared thermometer handy. I do get what your saying though....maybe I'm too critical. i just don't understand why the right side (front) muffler end is black on the inside and the left (rear) is a golden brown color. I don't have the cash to drop down on an expensive dyno tune right at the moment that would be the best choice i know
I'll check for a leak....I don't have a infared thermometer handy. I do get what your saying though....maybe I'm too critical. i just don't understand why the right side (front) muffler end is black on the inside and the left (rear) is a golden brown color. I don't have the cash to drop down on an expensive dyno tune right at the moment
that would be the best choice i knowWhat year is your bike? Mine is an 08. When I put the Jackpot mufflers on the right one got black with soot a long time before the left one. The stock mufflers did the same. There is more exhaust coming thru the right muffler on mine. That is normal, even for the stock setup on later model bikes.
I reread your post but didn't see if you had true duals or not.
Last edited by JustDennis; Jul 9, 2009 at 11:15 AM.