1997 Express LT4 Cammed L31...0411 Swapped, Tuned, Dyno'd....Ran out of engine!!!

[Fast355]

Felt like sharing this about the 0411 swap. Dialing it in is super easy. I never even had a wideband on it, until the dyno this afternoon and my target/commanded air/fuel ratios were practically identical to the wideband on the Dyno. This Mustang Dyno has been verified to be 10% lower than a Dynojet. This is 3rd gear with the torque converter locked, commanded 3rd/Lockup at 30 MPH and 1,500 rpm. Engine is the stock long block save for the LT4 cam, 1.6:1 roller rockers, and LT4 valve springs, retainers, etc. Has stock manifolds (tired of cheap, leaking shorty headers) on it again, stock HD truck sized exhaust, highflow cats and magnaflow muffler. The intake manifold is stock, has the GM MFI injector upgrade, a reworked stock throttle body and an 0411 PCM swap with HP Tuners. Also ditched the mechanical fan, added a pair of E-fans and an underdrive pulley I found on Ebay. I think its making decent power for just a little L31 350. 281 RWHP @ 5,540 and 295 RWTQ @ 4,440 with 240 RWTQ from 1,500 rpm the LT4 cam advanced 4* is anything but gutless on the bottem. On the street with the L35 S10 Converter it flashes to 2,700ish and puts me in an area the engine is making over 270 RWTQ. Run #2 was made heat soaked, immediately after Run#1, E-fans roaring on high fan speed trying to keep the engine from going above 180*F. The IATs were very elevated on run #2 and it was causing the ECM to retard the timing about 4-5*. On a Dynojet it would read around 310 RWHP/330 RWTQ.