built rb20 no ...ass... little help

[preston240sx]

Alright well I just did a fresh rebuild on this Rb20 just worked out all the small Bugs..the problem. I'm having is when the hx35 boost to say 10 pounds... There is no go......anyone have a idea....I was thinking wastegate stuck open...... Or a bad blow off valve maybe they are open? Shoot me some ideas

[EvoVIII808]

need more info. Spark Plugs, Plug Wires,Fuel, Vac Leak,Boost leak, can be many things. Is you boost controller hooked up right? 10psi may be wastegate preset psi.
Does it boost over 10?

[preston240sx]

need more info. Spark Plugs, Plug Wires,Fuel, Vac Leak,Boost leak, can be many things. Is you boost controller hooked up right? 10psi may be wastegate preset psi.
Does it boost over 10?


Getting -22 on the boost gauge smooth idle.. runs fine...no boost controller..just factory holset wastegate..I've hit 18 psi on it still no ...go. engine whines out smooth just no ummmf no suck u back in Ur seat.... Engine has the following

Rb20
Hx35 holset
Spool rods
Oem ceramic coated pistons
Arp head studs
Arp rod studs
Oem head gasket
New oem oil pump
New oem water pump
GTR 440 injectors
300zx maf
Emance ecu
Freddy bov
Stock coil packs

I know there are a couple more big things ... But the engine is sound..
Just can't figure this no power thing. Runs fine untill boost ..then it feels like there is no power as boost and rpms increase

[ultimateirving]

check ur timing, sounds like something is off if it runs and fires, but has no pull.. i know my car was running like a dog when i had the timing too retarded. It would drive ok, but felt like a n/a 2.0l

your BOV could also be venting under boost, If you havnt done it yet try putting the whole system under pressure to hear for any hissing

[AdamR]

AFR? maybe a big boost leak.
But you are running an Emance tune, so that is probably going to be part of it.

[preston240sx]

The tunes not the problem nor is the timing I marked everything the cas is in the same spot even hooked my laptop up time is dead on .. how do u guys check for leaks in the boost in the charge piping

[Yellow4g63]

If they decked the block and head then those marks mean very little now. check your ecu for codes, maybe you didn't plug in your knock sensors, or the CAS is going bad.