So the car is a C7 Z06 with a Magnuson 2650, big cam ported heads and about 21psi. I rebuilt the engine after the oil pump froze up on me during a pull. Clearances were good, everything went together fine.
First issue we had was the head was leaking coolant (ported hit a water jacket). Swapped that out and once we put the 5" intake and 112mm throttle body the idle seemed to go to hell. I updated the tune and when it's warmed up the car drives excellent. But while it's warming up if you try to put it in gear the car starts to backfire. Timing goes straight negative and it's like the car is going into boost at idle. I suspect it has something to do with not enough vacuum with the big intake and tb. Anyone else have any issues with the big intakes and tbs? Pretty sure the vacuum drops and the bypass opens open and it's a run away effect.
On the mechanical side the oil pressure started dropping. After just rebuilding the motor I'm fairly concerned. At start up its around 40 but if you let it sit and get warm it'll drop to 15 psi. Also, it'll overflow a little coolant too if you let it idle long enough or take it for a drive on a hotter day. I wonder if the head surface (it's been off a lot) needs to be decked again? Would a bad head gasket cause enough issues to lower the oil pressure before the oil really has a chance to get heated?
Just trying to get this car sorted out before I lose my mind. Any help is appreciated.
JUICEDZ.2650.2023.005.VTT.hptJUICEDZ.2650.2023.IDLE.hplJUICEDZ.2650.2023.003.hpl