Dustin? Anyone?

Obviously,there is a passage which is restricted or not opening.

The internal passage may be restricted or even casting slag blocked.

You may try swapping the valves and controls from one compressor to the other.

You may also look at the inner cooler for fin or otherwise restriction.

check the pully to see if it may be sliping on the end of the drive, it is just a friction drive and can slip, it does happen.

If the pulley is slipping the charger would cause this issue?

Yes, if the blower stops turning the fuel on that side stops flowing and lean pops back, all the fuel has to pass thru the blower and if it does not turn at the right speed for a time it can happen. We have seen it. If the drive inside the snout breaks it will still idle but bang back hard under load.

Getting it straightened out. Plugs were black and very rich.

Relocated the regulator near the fuel rail where it was before customer moved it!!!

Base fuel pressure 50 PSI, new set of plugs and its running great.

Still an issue when bringing back throttle. I think they messed with the bypass valves when installing the exhaust, and the IAC is not responding properly.

Any info in setting them up?

50 psi fuel pressure?? Seems a bit high to me. What size injectors??? I run 60 lb injectors at 38 psi. My old setup was stock injectors at 45 psi.

Actually we did answer, we said its either lean or spark related. First check is the ignition system, cap, rotors, plug wires, coil, etc. After that, which I doubt is a problem, an air fuel meter should be installed to see if it's lean, which I assume it is. Every boat/weight/gear ratio/prop size and type/ are different so the map is probably off from what it needs to be in this boat.

Dustin

Regulator mounting can effect harmonics in the rail, both rails need to drain into both sides of regulator so it helps dampen. If its longer than 12", it may need dampner. But again, it's probably lean under decel, this boat, which I believe is a pontoon boat, probably has considerable load during decel and is in area's that have not been extrapolated in the map.

Dustin

Engine is out of the boat on a stand.

Thanks for the input Dustin.

In no way shape or form is this the Whipples fault!!! Someone evidently messed with something that they didnt understand.

Dustin - where can I get new screens for those injectors? Need 8 of them please. Or a model number of the injector to get the screen kits locally.