after my manual/3.5L conversion my car is running rich.
as on my dyno graph, the A/F ratio, as RMP increases, starts to dip and is heading towards 10:1
my lower expected power output, also shows this. as i only reached 121.5 FWKW
as another magna, also 3.5L, but an automatic, running very similar exhaust system, and using the exact same dyno, only minutes apart from eachother. achieved around 128FWKW. i was hoping for at least 130FWKW as mine was manual.
i checked my 02 sensor by follwing the instrustions in the workshop manual, by testing the resistance and voltage output,
and the MAF also appears to be in working order.
Madmagna says the ecu is not to blame as the fueling maps are very similar, and the ecu should automaticly compensate for the 3.5L engine.
i plan on getting the streetfighter manifold and Prosequential ECU package, but i would like to know why it is doing this in the first place.
http://i304.photobucket.com/albums/nn177/lowridermagna/DYNO.jpg

Standard tune. the factory ecu's can differ in their fuelling as we are learning here on amc. Chilsom had a rare flatish AFR in the 12's on a stock ecu. My dyno showed pretty much exactly like yours with extractors only(sports). This is a standard safe factory tune. Most are like this. No need to panic, just wait till you get you manifold a ecu