[scarceller]

Allow me to share a little story about my personal 3.2L to show the points I'm making.

I bought my car with a slightly modified 3.2L Euro engine, custom cams, extrude honed intake, SSIs and M&K 2in2out pipe. When I bought it it ran like crap but seemed to really scream at WOT. What occurred was that someone prior to me owning it had increased FP to 2.5bar by simply crushing the FPR in a vise! So the FP was .5bar above spec, often some folks think this is a good idea, more fuel is better. What this did was richen the mixture across the board. Then they decided to tune it on a dyno, pull a few WOT runs. They saw the mixture very rich so they leaned the WOT maps to fix it, nice idea and sure it fixed WOT and the motor made power and a lot of it! about 228hp at the wheels!

Job done, right?

Well not so fast, the car drove like crap and had horrible fuel economy. It did not take long to discover the rigged up fuel pressure regulator and then replace it with a new one. But now all that money spent on the dyno and the tuned WOT maps, wasted $$$! Sure the tuner made money but the customer was unhappy, as a matter a fact the customer (prior owner) ripped out that motor and traded it for something else, that engine landed in my car and took time to debug and properly setup.

This story shows why a unhealthy car should never be tuned. You can't say my car runs crappy so let's dyno it and tune it.