Fastspec2, thank you. I idle about 13.8:1 AFR, into the boost and it gets into the 11.5:1 range. It comes on boost around 3,500 rpm if I'm just...
I'm running a 4v 4.6 w/8.5:1 compression. I truly have no idea on what turbo, was purpose built by an older guy who has since passed away. I run...
I am trying to find "typical" IR (Infared) head temps on a turbo 4.6 DOHC. I am running mine in a jet boat w river water constantly flowing...
Ashford, thank you for that info. Is there a recommended tuner I should use. The boat can't be strapped on a dyno. So I would have to run mild,...
Saltfever, the thermostat would open an then cool 65 degree water would rush in. This would constantly cause the computer to see hot then cold....
I've posted in the carburetor section before, but have decided to go back to F.I. I have a 4.6 dohc B head engine. All forged internals with 8.5:1...
I have no idea about the pv. It is a CSU carb that I ordered specifically for this build. The guy at CSU is the one who recommended the bypass valve.
Tbird, thank you. I'll have to wait until it's warmer to get the boat back in the water. But I'll update once I find out
Tbird, yes, AFR is richening. I run under part throttle, cruise 3000-3200 rpm, 13:1 AFR. It will surge uo in rpm and afr goes into the 12's. I...
Thank you for the reply. I have tried lowering the base fuel pressure as low as possible and it does no good. And tried referencing manifold to...
Engine surges and a/f ratio increases during cruising rpm, not in boost. This is a 4.6 dohc ford mod motor in a jet boat. I am not running a...
