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Old 07-15-2010, 05:31 AM   #299
Scooby Guru
Member#: 32792
Join Date: Feb 2003
Chapter/Region: NESIC
Location: lincoln, ri
2003 GGA MBP
12.9 / 105+


Originally Posted by dexterous View Post
Guys, based on logging, it appears that my car spikes a few psi above target boost just about every time, is this normal? I have my boost cut set at 3psi above target and I hit boost cut during a hard pull up a hill the other day. I turned the manual down a bit so that it wouldn't happen again but why is this happening? After the spike the boost holds rock solid on target so the system is working fine in that regard.

My target 27.5 psi and its typically spiking no more than 2 psi which is about 7% so its not like its a major over boost or anything. Is there any way to reduce or eliminate the spike?
well the first question to ask is whether or not it spikes using ONLY the MBC to clamp the boost.

if NOT, the the answer lies in your EBC, and i agree with NSFW that you've got to tweak it some.

if it DOES, then the issue could be due to latency in the pneumatic signal--check all hoses and fittings for obstructions, kinks, gunk, perhaps swap out for larger ID tubing.
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