Anyone running a Schneider 270-60F-14? Questions about idle

[juggernautjoee]

I've got an l28et, P90A head swapped to solid lifters.  5 angle valve job.  Dished pistons, so low compression.  Cooling head mod.  440cc injectors.  Stock 280zx throttle body and intake.  Aeromotive FPR.  Home-made detcans.

 

MS3x COP 

AEM Wideband

2.5in downpipe into a 3in exhaust

 

Cam is a Schneider 270-60F-14 degreed to what the cam card said (I think it said 108?).  At cold start I get ~10in of vacuum.  Once warmed up, the best I can get with ~850RPM idle is ~14in of vacuum.  I talked to Schneider about this and they told me to open up the lash to .010 and .012 respectively.  That improved my idle by 1-2in of vacuum.  I know the cam might be causing the wideband to not give a true reading, but at warm idle it likes ~12.2-12.5:1 AFR to achieve a smooth albeit weak vacuum idle.

 

I have checked for vacuum leaks everywhere.  Totally removed the intake/exhaust manifold, purchased new gaskets and applied a very thin coat of rtv.  I made sure the intake was flat with a very large bastard file.  All ports have been plugged including pcv for testing.  I put it all back together and got the exact same amount of vacuum.  No change.

 

I have verified with a timing gun, set to 2 stroke mode, cranking and idle ignition are lined up perfectly with what tunerstudio says.  No drift.

 

I've got my idle set to 20 degrees advanced.  Does anyone else run a cam like this with a similar setup?  I'm guessing I need more advance at idle, maybe 25-28.  But I want to compare to someone who has a similar build, or has more experience than me.

 

Specs of cam:

Part Number:	17043
Grind Number:	270-60F-14
Intake Duration (gross):	270
Exhaust Duration (gross):	260
Intake Duration (.050”):	230
Exhaust Duration (.050”):	220
Intake Valve Lift*:	.460"
Exhaust Valve Lift*:	.460"
Lobe Separation:	114
Intake Valve Lash:	.008"
Exhaust Valve Lash:	.010"
RPM Range:	2200-6400

 

Edited 2 hours ago by juggernautjoee