Just over a year ago I got the first Protune at Agile Automotive Performance - Tuning, Fabrication, and Parts.
I returned today to address a drop in maximum boost levels and see what the Donkey'd exhaust mains - Grimmspeed crossover was good for.
I was mostly quite happy with the results; 246 awhp, 268 awtq. Last year it was 237 / 268 and 10 degrees cooler at the time of the tune. I also gained 1 psi for a maximum of 20.
Hill was his usual professional self, making the best of what was there and thoroughly explained what was going on. His attention to detail and knowledge of tuning is impressive.
I lost ~200 rpm worth of the fast spool I had, but gained more top end. The dotted lines were last year's tune; the solid was today. The high flow crossover seems to be the cause of the lost low end grunt.
I kind of wish I still had the faster spool and stronger torque down low. Hard to say if the butt dyno misses it for real, especially since my boost levels had dropped off since the first tune.
So, which is the better tune?