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XP cam boost and vac numbers

1998gpgt

1998gpgt

New member
One of my friends just installed an XP cam and it seems like he is seeing some unusual numbers. His mod list is: XP cam, 2.8", SSIC, 105# springs, modded retainers, pacesetters, N*, FWI. His max boost is currently 5 psi and his vac at idle is 10 in Hg :th_scratchhead: Is it just me or are both of these numbers very low? And what would be causing this? a bad vac leak?
 


vacuum doesnt sound horrible, im rockered and my car only gets around 14 in vac when warm. the boost sounds a little low, is the bbv working correctly? sounds like the bbv is bleeding off boost.
 
I see almost 12 lbs of boost with my setup and 16 inches of vacuum. 9.6.5:1 L26 XP cam P&P heads, Gen V, 3.2 pulley.
 
See if the BBV is unplugged. If it's not, unplug it and see if it changes anything. With the BBV not functioning/plugged in, it should limit the boost to 5psi, so troubleshoot that.

If he's running a 2.8 pulley with a ssic, he should have a tuner close by or he's in trouble, have him post up a scan.
 
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