Head port polishing and sensors
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In the Staging Lanes
Joined: Mar 2010
Posts: 54
Head port polishing and sensors
Ok, some of you have read how my 99 3.8 Camaro is in the shop for engine repairs by now, rod thrown while racing a American made bandit (Mustang). Anyway, I have come across in my reading about how polishing out the ports on the head can increase air flow up to 54 cfm on the intake, depending on the techique, and 25 cfm on the exhaust flow. http://camarohomepage.com/project/part3.htm Now, will this compromise my sensors also. I can get the port polishing for $150.00 at a local machine shop. They are telling me it will not hender the senors but then when I called other shops they stated this type of airflow will not be noticable and could affect the sensors. I am also going to install, God willing, pace setter headers and cat back exhaust with a maganflow. Anyone, anyone... 
Overdrive Member
Joined: Apr 2010
Posts: 3,354
From: Spanaway, WA
THe port and polish alone will not effect your sensors at all. They are there to determine the airflow so to speak. The headers will give you gains in the exhaust flow department and you would benefit from a tune if you are going to start playing with things like this. Before you get the tune tho finish all your mods, or you will be paying for another tune.
Massey
Massey
Thread Starter
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In the Staging Lanes
Joined: Mar 2010
Posts: 54
THe port and polish alone will not effect your sensors at all. They are there to determine the airflow so to speak. The headers will give you gains in the exhaust flow department and you would benefit from a tune if you are going to start playing with things like this. Before you get the tune tho finish all your mods, or you will be paying for another tune.
Massey
Massey
but when the term "tune", does this mean hooking up to a computer of some kind, bully dog? Rather what is involved or equitment, instruments etc? Thanks
Thread Starter
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In the Staging Lanes
Joined: Mar 2010
Posts: 54
Overdrive Member
Joined: Apr 2010
Posts: 3,354
From: Spanaway, WA
a tune is where you reprogram your computer's fuel and timing maps to work better with your new equips. This is done with tools like the Bully Dog but better done by a professional and a dyno. Places like PCM4Less can get you a tune based on the information you give them and send you a PCM already set up for you. They can do this because they have studied many different cars and have found good working profiles based on that study.
Massey
Massey
Thread Starter
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In the Staging Lanes
Joined: Mar 2010
Posts: 54
a tune is where you reprogram your computer's fuel and timing maps to work better with your new equips. This is done with tools like the Bully Dog but better done by a professional and a dyno. Places like PCM4Less can get you a tune based on the information you give them and send you a PCM already set up for you. They can do this because they have studied many different cars and have found good working profiles based on that study.
Massey
Massey
Thread Starter
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In the Staging Lanes
Joined: Mar 2010
Posts: 54
Just as an addition here, if you live in a city like I do, or even near a city like this you can often find dyno tune and performance shops.
right down the road from here in marietta GA is mti racing. They specialize in vette tuning and racing, which includes ls1/lt1 engines. A standard dyno tune at most shops can probably run you about $450, after that.. you may have a lower re-occuring tune charge.
right down the road from here in marietta GA is mti racing. They specialize in vette tuning and racing, which includes ls1/lt1 engines. A standard dyno tune at most shops can probably run you about $450, after that.. you may have a lower re-occuring tune charge.
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