1998 Bolt-On Car DC Perf Software Before & After

PhoenixGTS

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1998 GTS: stock air box modified to have 3" outlets, 3" smooth tubes, 70mm throttle bodies; 1.7 rockers, stock long block, full Belanger exhaust with stock cats with inlets and outlets enlarged to 3". See after charts for comments.

Before using Mopar High Performance PCM with 5007 code:

Before horsepower over torque - the heat of successive runs is really degrading power:

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Before horsepower over air/fuel mixture:

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Baseline best run in red over after best run in blue, horsepower over torque:

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After horsepower over air/fuel mixture:

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You can see that the air/fuel mixture went from a messy 12:1 to a much more stable 13:1. Notice also how on the below after three runs that the degradation on the successive runs is much less after - about ten peak horsepower per run before and only about seven and a half peak total horsepower over all three runs after. This would appear to really be helpful for roadracing where you run a straight, back off then make another run at a straight.

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PhoenixGTS

PhoenixGTS

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Follow up post: after seeing my post DC Perofrmance software dyno plots DC Performance thinks they have done the best they could and sending the computer back in hopes of squeezing out some more power would only lead to the danger of spark knock. Car runs a lot smoother now, is not idle hanging, and is strangely quieter.
 

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