New fuel pump = retune? - NJFBOA - Home of New Jersey's Camaros and Firebirds

The_Bishop · 06-25-2013, 07:49 AM

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.

LTb1ow · 06-25-2013, 08:15 AM

Is this a question?

8

sweetbmxrider · 06-25-2013, 08:16 AM

I believe its rhetorical...

WildBillyT · 06-25-2013, 08:57 AM

CSB?

The_Bishop · 06-28-2013, 04:14 PM

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.