Join Date: Jul 2005
Location: Kansas City Are
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Boost leak test with MBC question. Etc
Sooooo this is an on going thing with my car for over a year now, thought I would ask here. Car is a 50 AGP trim all solenoids deleted boost contolled via manual boost controller.
Car originally had a Perrin MBC. My tuner told me it is junk. I noticed it would whistle during a boost leak test. It has a bleed port on it was told that was normal. So I went with a Hallman MBC. They are known to be the best. But everytime I do a boost leak test that thing whistles like crazy at 10psi. So I can't really get past 15psi due to it bleeding like crazy during the test. Just remove it when doing boost leak test I guess.
So I noticed when driving my car my boost needle shakes like it has tourettes at 22-24psi @ WOT. This is what I have my MBC set to. I am guessing this is due to the MBC bleeding out boost? I had issues holding boost and my tuner (Duster360) told me to put another Tial spring in my Tial 38mm wastegate. (you can compound the springs)
So my 38mm has like 21lbs worth of springs in there. It holds boost fine, but the needle shakes on the boost gauge when going WOT and hitting peak boost. Is this a normal occurence with a MBC due to it bleeding? Does having the stiffer WG springs affect anything?
Hallman offers a stiffer MBC spring. Would that help? I emailed them and they said it wouldn't do much of a difference.
Since my WG has 21lbs worth of springs couldn't I just remove the boost controller and run just off the WG pressure if I just wanted 21lbs?
Thanks guys for any help. Car runs fine and made good power with the needle "shaking" like that so I am thinking it is normal. Just new to the world of MBC. Used to PCM controlled setups.
05 PW1 SRT-4
AGP 50 trim and supporting mods