Could this cause me to run lean?

[AndrewM]

I dyno'd my 240 the other day and I was in the mid to low 13's on afr's. I have a redtop sr20det and I just realized today that the vacuum source had come off of my fuel pressure regulator. I was running 12psi and I was lean the whole way. It got a little better as the rpm's went up but still pretty lean. Would that vacuum source have caused me to run lean?

I have an upgraded front mount intercooler and a walbro 255 pump and 12psi. Everything else is pretty much stock. I dyno'd 230rwhp corrected, but Im over 5000ft. above sea level so my actual power was 188rwhp. There is no way I should be out of fuel at 190rwhp, right?

[opponheimer]

Damn, thats pretty lean.. Yeah with that vacuum source unplugged, that would have caused you too run lean, unless you have the wrong injectors, and/or your FPR is shot. But you're lucky you caught that, and you're probably fine. Sr's can take a beating. I remember trying out a Megan FPR, and putting fuel pressure to 55 psig, and the car would go to 14:1 AFR at WOT, without me knowing (until I had a friend hook up his wideband.) I have a different motor now though, that one suffered a few dropped valves.

My advice is, get a wideband kit, it'll be the best mod you could ever buy.

[wonkuuzenki]

That would definetly cause you to lean out, but not enough to do serious damage to the engine.

go wideband and be happy:)