Quote:
Originally Posted by Nemesis
Not to be a pooper, but what this graph shows is that we lose intial HP and torque by 7-14 hp and gain it all in the rev range starting at 3000rpm. This is probably the best case scenario for an exhaust, intercooler and tune on a 2.0 liter 4-cylinder. But, I'd be a bit worried to lose any initial power for a daily driver. Yes your gaining a lot at the top, but I usually shift around 3250 in regular driving and around 4000rpm for spirited driving. I do "race" it every once in a while, but for a 4 cylinder, initial torque and power are important. I can see that Eloiy really worked to keep as much initial torque and power as he could. Typically when tuners start working on a 4-cylcinder engine, they sacrifice all the initial power for higher rev range power, because most people don't get to see graphs like Eloiy shows us, and they end up buying high end power figures only.
|
The initial loss in the low end is probably due to the intake set up we were trying (more airflow but hotter air). The dip was not there when the car was cooler. If you notice the run number you can see the number "50". Thats the 50th dyno pull we did! The car never sat for more than 5 minutes between pulls so at this point it was pretty heat soaked. We are trying to work on a solution that would bring the bottom end up a bit. On my car, I tuned down the torque because of wheel spin issues.