10 psi in Neutral

[DJpowerHaus]

I'm not yet on the road because of an overly rich fuel problem, but one thing I've noticed with my car is that a quick reving can build 10psi of boost in Neutral (no load on engine). Why would it be doing this?

My mods... RWD, kevlar clutch, brand new Evo3 16G, cracked manifold with broken studs all around cyl 4, 3" downpipe into 2.25" exhaust, no cats, Starion muffler, stock motor top and bottom end with Starion IC, very short IC pipes (2" x 10" hotpipe / 2.5" x 8" cold pipe) Tial 35mm ext. wastegate...

The guage reading is an accurate Autometer guage Teed into a vac line off of the plenum...

Why would it boost so much so easily.. is this normal for a brand new turbo or is something wrong?

 

[Defiant]

Originally posted by DJpowerHaus
I'm not yet on the road because of an overly rich fuel problem, but one thing I've noticed with my car is that a quick reving can build 10psi of boost in Neutral (no load on engine). Why would it be doing this?

Why would you be doing this? Don't.

Save your engine until it's on the road.

 

[billdo_83]

Originally posted by Defiant
Why would you be doing this? Don't.

Save your engine until it's on the road.

Exactly.

But its normal to build boost in neutral. I can build 12~ lbs

 

[DJpowerHaus]

Alot of the reving is me trying to figure out how the fuel problem is manifesting itself... ever hear of a car running for 3 minutes with the fuel pump unplugged while holding it at about 3000 rpm?... its so rich if you dont hold it there it will stall. Plugs definatly foul after a few min and I've already had to change the oil becuase it thined out... dont know if its excessive pressure in the fuel line, bad MAS, stuck open injectors (all 4 are the same).