[186Kmps]

new to site. need info on power loss in higher RPM range. recently upgraded intake, exhaust, plugs/wires, sensors, etc... instinct says stock ECU is unable to adapt to modifications. constructive criticism is appreciated

 

[slick91]

Is your car catless? what size exhaust pipping?

 

[gelogmarine]

did you ever reset your ecu after adding the mods?
maybe get an upgraded ecu or reflash

 

[schroder]

Has it lost power since the upgrade, or are you trying to find out why it falls flat at 5500~? They naturally tank out until you upgrade your intake manifold - the factory one just doesn't have the airflow up top to keep going. Usually to correct that it's the intake mani's, cams, and TB.

If it's just recently lost power and you haven't upgraded your headers, the factory cat(s) can clog up and rob you of upper horses.

 

[slick91]

Has it lost power since the upgrade, or are you trying to find out why it falls flat at 5500~? They naturally tank out until you upgrade your intake manifold - the factory one just doesn't have the airflow up top to keep going. Usually to correct that it's the intake mani's, cams, and TB.

If it's just recently lost power and you haven't upgraded your headers, the factory cat(s) can clog up and rob you of upper horses.

i figure if the cats were removed with the upgraded exhaust, that might be where he lost his power only because an n/a motor runs better with back pressure. Unless your forced induction you will lose power with a big exhaust and no cats

 

[186Kmps]

Is your car catless? what size exhaust pipping?

catless. headers only go halfway back. 1-1/2" pipes

 

[186Kmps]

Has it lost power since the upgrade, or are you trying to find out why it falls flat at 5500~? They naturally tank out until you upgrade your intake manifold - the factory one just doesn't have the airflow up top to keep going. Usually to correct that it's the intake mani's, cams, and TB.

If it's just recently lost power and you haven't upgraded your headers, the factory cat(s) can clog up and rob you of upper horses.

quick snapshot: yanked my engine/clutch and swapped for same year/make/model but lower milage engine, w/ stage 2 clutch attached. kept my trans cuz mounts were different. installed aftermarket headers & intake cone on the MAF. headers go only halfway back.