Ok have a recent problem and was looking for input.
I noticed one day my boost dropped from 9 psi down
to about 3 or 4 psi. Now my first thought was intake
tubing so i took it all off and resealed it and i swear its
all airtight. My next thought was intake manifold and that
seemed fine too. I also checked the intake side of the turbo
and there is no play on the turbine. Now i think it could be
the wastegate. So when i disconnet the actuator the
brass rod still moves and i can feel some resistance
but the piece it connects too on the exhaust side of the
turbo is extrememly loose. I need to know is this normal
and if so anyone have any idea what i should try looking for?
Thanks for the help and i really don't need any wise comments
in return
hey brad, does your hahn kit have the alumium plenum or the 90 degree boot on top of the trottle body?
Hahn Stage II
350 H.P. to the ground coming very soon
with total build up.
I believe its the plenum why?
well, my hahn kit came with the hahn plenum with the hahn logo on it which i really liked, but the welds cracked several time and i just gave up. i had the same problem as you did. the plenum was my problem. i called them and they sent me the rubber elbow instead of the plenum. when i put that on, my boost spiked higher than it ever was before.
Hahn Stage II
350 H.P. to the ground coming very soon
with total build up.
Yeah i have the metal one with
the ugly welds but they are not
broken i'll contact them to see
if i can get the other one anyway though
thanks for the tip. I'm still looking for a reason
why i'm losing the boost though. If you detach your
wastegate actuator can you tell me if the lever on the
exhaust side of you turbo is completely loose. its only held
on by a metal pin so don't be afraid of it.
never mind someone alread answered
Good point. Yes the lever is supposed to be loose so that
wasn't my problem. Which again leaves me with no clue
what happened to my boost pressure. So I'm still looking
for advice, tips, or ideas on where to go from here. I still
feel it should be the wastegate but not sure if there is
a way to check it.
I blew my plenum off at the dyno on saturday. I just couldn't get a good seal. So I dynoed with the hood shut. I should be redoing that this week.
give the guy a break, he's got a question and nobody is helping.
yes, it's supposed to be loose, i know that got answered, but i thought i'd re-iterate.
do a boost leak test, not just a visual test. www.vfaq.com is awesome.
once you've done that, disconnect the vacuum line to the wastegate, and be VERY carefull. this will make you run as much boost as that vacuum can will allow -- probably from 12-25 psi. so, do this ONCE just to see what it goes to. if you still can't break a couple psi, and you're 100% certain that a boost leak tester found no leaks, you've got a bad can.
if it spikes like crazy, post back and i'll give you more ideas.
give the guy a break, he's got a question and nobody is helping.
yes, it's supposed to be loose, i know that got answered, but i thought i'd re-iterate.
do a boost leak test, not just a visual test. www.vfaq.com is awesome.
once you've done that, disconnect the vacuum line to the wastegate, and be VERY carefull. this will sealyour wastegare closed --you could see a ton of boost so, do this ONCE just to see what it goes to. if you still can't break a couple psi, and you're 100% certain that a boost leak tester found no leaks, you've got a bad can.
if it spikes like crazy, post back and i'll give you more ideas.
Thank you very much i appreciate the advice.
I'll try that soon.
best way to check for a leak is to pressureize the system , cap off the inlet of the turbo , and the piece going to the tb , and use a air compressor to force air in , but keep the pressure regualted low as you can you dont want to put more than15-20 psi in the system
also use something to lock the turbo impellor in place so it doesnt spin with out any luberication
if you do it as the other guy susjested , you have a good chance of damaging something
[quote=97cavie24ls(JDM cav sedan™)]
also use something to lock the turbo impellor in place so it doesnt spin with out any luberication
if you do it as the other guy susjested , you have a good chance of damaging something
Yes, because static air pressure creates enough airflow to spin your compressor wheel.
Care to add anything else?
[quote=97cavie24ls(JDM cav sedan™)]best way to check for a leak is to pressureize the system , cap off the inlet of the turbo , and the piece going to the tb , and use a air compressor to force air in , but keep the pressure regualted low as you can you dont want to put more than15-20 psi in the system
also use something to lock the turbo impellor in place so it doesnt spin with out any luberication
if you do it as the other guy susjested , you have a good chance of damaging something
turns out, no, you just don't have a fu(king clue to what you're talking about.
wow such anger.
Thanks for the input though.
