update: it's at 12psi again, but still need some ideas, read last posts please.
10-26-2008, 10:49 PM
#1
0.0 BAR
Thread Starter
Join Date: Jan 2008
Posts: 0
update: it's at 12psi again, but still need some ideas, read last posts please.
ok so my turbo zc crx is having an issue. i just sold the car so i can't go check things out, but i figured i'd get some ideas from you guys anyway.
so a few weeks ago i was gonna post the car on craigslist. i turned the homemade mbc down all the way so no dumb ---- from craigslist blew up the car. a week later i decided to not post it there and i was gonna keep it. so i tightened up the mbc a little and went for a drive. wastegate opened at 5 psi. i pulled over and screwed the mbc tighter. still 5 psi...
so i figured my $3 homedepot mbc was crap after 6 months and it needed a new one.
i ended up selling the car and the guy that bought it put another homemade one on and it's still doing it. i told him to find someone with a mbc that he could borrow and let me know if that fixes it.
then i started thinking maybe the charge piping is leaking at 5 psi and it's not the wastegate opening. so i told him to check all the charge piping.
i just did a compression test and a leakdown test so i know the motor is good enough to build boost
fyi: the wastegate is a cdm one
any ideas of what might be going on if the mbc is fine and the charge pipes are fine? it drives fine, everything seems normal. bov sounds good, sounds like the waste gate is opening. car is not smoking anymore (replaced valve seals). all is good except for the 5 psi.
so a few weeks ago i was gonna post the car on craigslist. i turned the homemade mbc down all the way so no dumb ---- from craigslist blew up the car. a week later i decided to not post it there and i was gonna keep it. so i tightened up the mbc a little and went for a drive. wastegate opened at 5 psi. i pulled over and screwed the mbc tighter. still 5 psi...
so i figured my $3 homedepot mbc was crap after 6 months and it needed a new one.
i ended up selling the car and the guy that bought it put another homemade one on and it's still doing it. i told him to find someone with a mbc that he could borrow and let me know if that fixes it.
then i started thinking maybe the charge piping is leaking at 5 psi and it's not the wastegate opening. so i told him to check all the charge piping.
i just did a compression test and a leakdown test so i know the motor is good enough to build boost
fyi: the wastegate is a cdm one
any ideas of what might be going on if the mbc is fine and the charge pipes are fine? it drives fine, everything seems normal. bov sounds good, sounds like the waste gate is opening. car is not smoking anymore (replaced valve seals). all is good except for the 5 psi.
10-27-2008, 02:48 AM
#6
1.5 BAR
Join Date: Mar 2005
Posts: 723
Re: boost controller not working. wastegate is opening at 5 psi.
Pull the MBC off, remove the hose from the WG, and plug it - leave nothing connected to the WG. CAREFULLY bring the car into boost, and see if you can go above 5psi. Then try 10psi. Then...well don't get greedy, find a WORKING mbc. Problem solved. If not, then there's a bigass boost leak somewhere.
10-27-2008, 08:25 PM
#7
3.0 BAR
Join Date: Dec 2006
Posts: 1,505
Re: boost controller not working. wastegate is opening at 5 psi.
Originally Posted by HiProfile
Pull the MBC off, remove the hose from the WG, and plug it - leave nothing connected to the WG. CAREFULLY bring the car into boost, and see if you can go above 5psi. Then try 10psi. Then...well don't get greedy, find a WORKING mbc. Problem solved. If not, then there's a bigass boost leak somewhere.
