To start, this is the 2nd iteration of tuning for my s52. I'm curious why there is a dip in the graph at 5,500 RPM and never returns to full power. Is this is tune issue, a system issue (Vanos, exhaust), or possibly a resonance issue?? Most of the other graphs I have seen for s52's with similar modifications seem to be linear to redline. We also played around with the intake filter and inlet conditions with minimal changes.
Mods during dyno session are as follows:
-s52 converted to OBDI
-413 red ECU with custom chip by a knowledgable tuner
-Stock s52 cams
-24lb injectors
-3.5" euro MAF
-M50 intake manifold
-Raceland headers to OBD II midpipe and supersprint exhaust
-Rogue engineering pulleys
-Rebuilt Vanos with Beisan's seal kit
Graph is below and noted that AFR's are not shown, but my wideband read high 11's to low 12's until redline.
Performed on a DYNOmite dyno
Mods during dyno session are as follows:
-s52 converted to OBDI
-413 red ECU with custom chip by a knowledgable tuner
-Stock s52 cams
-24lb injectors
-3.5" euro MAF
-M50 intake manifold
-Raceland headers to OBD II midpipe and supersprint exhaust
-Rogue engineering pulleys
-Rebuilt Vanos with Beisan's seal kit
Graph is below and noted that AFR's are not shown, but my wideband read high 11's to low 12's until redline.
Performed on a DYNOmite dyno
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