New fuel pump = retune?
 

Well, the new Racetronix pump is in, along with the hotwire hit and a new pressure regulator. Fuel pressue stays at 60 PSI according to my test gauge. The car seems to run different. Wideband shows a steadier AFR, but the big surprise is at WOT. When I tuned the car it was 12.9-13.0 at WOT. Now it sits at 12.1.

I guess when I tuned the car the factory pump was getting a little weak on the top end, or the regulator was going, or whatever, and the whole 'Garbage in Garbage out' thing got me. Need to touch up my tune.

Is this a question?

8

I believe its rhetorical...

CSB?

Er, what? What's CSB stand for, or am I being dense?

Anyway, it's semi-rhetorical. Just an added thing I didn't think was going to happen. Just goes to show what happens when you tune with less-than-optimal components, then upgrade. Also, for those who know, it's not the long-term fuel trims, I shut them off a long time ago. Only have the short term trims active.