Excerpts from Article

Continued from this Dyno Database entry.

Finally, we enabled PWM methanol and spun up the dyno. Immediately, run to run variance dropped to within 1-2hp. Power curve smoothened out (less jagged). IATs dropped. The extra octane also allowed us to add a few degrees more ignition advance across the board. And after a few tuning runs, we saw this:

Procede tune vs. Procede Tune+Procede PWM Meth

Gains of 20-25WHP from 5500 to Redline. We actually saw a 45WHP gain at a high 8300rpm but that's not that useful so we can ignore that for the sake of reasonableness

SUMMARY
It's been a fun couple weeks playing with this car. Compared to the n55/n54 engines that we've been tuning since 2007, the s65 does present it's share of challenges. Namely the granularity needed to squeeze out gains in an NA application. It definitely needs more fine tuning since we are dealing with relatively small incremental gains each step of the way. But the initial results are promising and they should only get better with time.

But as it stands now, by adding the following:

Vishnu Procede and PWM Meth kit ($TBA)
Muffler Shop Primary Secondary Cat Deletes ($100)

We saw the following REALISTIC gains:

Stock vs Vishnu Tuned (Procede+PWM Meth+Cat Deletes)

• Gains of 20-45WHP over the ENTIRE useable power band.
• 53LB-FT peak gains at 2900RPM
• Absolute resistance to heat-soak
• Lower fuel consumption (leaner AFR targets and additional advance)
• Better part throttle response (due to lower IATs and extra advance)
• And niftly in-dash gauges, shift lights, code reading/clearing functions, misc DME activations, mapswitching, user tune-ability (if inclined.. but not necessary)