*****UPDATE ON PAGE 3*****

Hey guys,

Brought my car to the dyno to get it tuned right after my break in.
When I got there, they hooked up the car put the .5bar spring in my wastegate.
In the beginning they couldn't hold boost, the turbo was making 8psi at 7000rpm.
We found the the problem: boost leak from the turbo to the intercooler.
Soon as that was corrected, boost was going to 31psi!
Tried adjusting the boost controller with no change.
Removed the boost controller and tried running the setup straight off the wastegate, again the car went to 31psi

What could be the problem?

setup: gt35r on top mount AFI manifold, with nlr ams-500 boost controller, WG 44mm with small blue spring .5bar, ls/vtec

what could be the problem? how can I solve this?
tuner doesn't think it's the diaphragm in the wastegate is ripped because the wastegate is opening but he'll be opening it to check it...
anything else?

 

what does the manifold look like?

 

there is no way the wastegate is opening and you are still hitting 31psi.. are you sure the wastegate isn't post turbine?

 

the wastegate is pre turbine!
I'll post a pic soon!

 

Here are the pics:

 

Is it possible that if the coloured part of the spring was not installed downwards be the problem? (I don't know if it was installed but just something extra to check) does it make any sense?

 

sounds like your plumbing is wrong do you have the top port of the WG going to the EBC ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony413 &raquo;</TD></TR><TR><TD CLASS="quote">sounds like your plumbing is wrong do you have the top port of the WG going to the EBC ?</TD></TR></TABLE>

The side one is connected to the manifold and the top one to the EBC.
When we removed the boost controller, we removed the hose from the top of the wastegate and only ran the one on the side of the wastegate to the manifold.

 

is that top mount divided ? if so is your turbo divided ? because i only see one WG. aside from that i think you just need to recheck all your vaccumn lines and check valve, if that doesnt work take your WG apart and reassemble it if you suspect funny business with it

 

Take the spring out of the wastegate and double check your side port vacuum line. Make sure it's not clogged and whatnot.

You will find out lots of information by doing that.

 

out of curiousity, what are you using to read the psi? If you are reading it from the EBC, the sensor (absolute/relative) settings may be off. Although I have not had any experience with your controller, it sounds like either the reference it is reading from or it is not opening the gate. If you are running a .5 bar spring, that is about 8psi with the gate ran off the controller. This sounds like a possible controller/solenoid issue.

 

I was reading the boost off the dyno, and we removed the EBC and ran it off the wastegate only.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by tony413 &raquo;</TD></TR><TR><TD CLASS="quote">is that top mount divided ? if so is your turbo divided ? because i only see one WG. aside from that i think you just need to recheck all your vaccumn lines and check valve, if that doesnt work take your WG apart and reassemble it if you suspect funny business with it </TD></TR></TABLE>

no not divided manifold nor turbo, only 1 waste gate. I'll recheck all the lines along witht he spring installation.

 

anything else I can look for that could be causing me this problem?

 

So.... I checked the lines again and everything seems fine. Wastegate was removed reopened and checked for problems. Reinstalled everything and the car still shoots to 31 psi.

I tried contacting Tial, their comment was that the wastegate is not supposed to be positioned like that on the manifold (meaning 90 degrees to the manifold)...
They explained to me that wastegate must be positioned in the path of the exhaust fumes and not on the side of them...

Well the manifold I have looks very well build and the kit has been sold to other people as well without this issue... so what is the problem? ideas?

 

your WG position is fine. as proof of that look here theses turbo have awesome boost control



anyways check the source of your boost reference to your boost gauge. also what does your ECU say the boost is

 

TONY413.....do you know where i could get an exhaust housing like that????thanks

 

Forced Performance makes those turbine housings

 

you do have a boost source running to ur ebc, correct. Are you using properly sized boost lines, Tial rec. running nothing less than 1/4"i.d.

 

What do you guys think of the waste gate flange on the manifold?
Do you think Tial is right? I don't think so but here's a better picture of it's position.

I'll also be getting better pictures of the whole setup installed maybe you guys will notice a vacuum line that is off or plugged wrong.

 

Its the wastegate not OPENING......Its real easy to make sure that its the gate.....Take the wastegate off the car....Make a pull with it off....Yeap the car will not make 31psi....You need to set it up without the boost controller and make sure you have a good vaccum/boost source....Or you are getting a flase reading....Hook up a boost gauge and see what it reads or what does the ECU read from the map sensor....Does it say 31psi

 

The wastegate placement on that manifold may not be OPTIMAL but it serves its purpose to an extent...With horrible wastegate placement its harder to keep boost low and keep it low. For instance if you tried boosting 8 pounds with a 35r it may not do so well..It doesn't seem like the wastegate is working, period.. What are the chances its stuck closed?

 

make sure the diaphragm is not getting pinched when you tighten down the top section of the wastegate.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dannydos &raquo;</TD></TR><TR><TD CLASS="quote">TONY413.....do you know where i could get an exhaust housing like that????thanks</TD></TR></TABLE>

forced performance and theres also a company here on H-T that will mod your current housing similiar to what FP does.

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by redboost10 &raquo;</TD></TR><TR><TD CLASS="quote">make sure the diaphragm is not getting pinched when you tighten down the top section of the wastegate.</TD></TR></TABLE>

didnt think of that one.

 

its happened before. when chaning springs and putting the top section back on, get something skinny but dull and lift up and push in on the "lip" of the diaphragm to make sure it is not getting pinched by the top lid.

i alwasy get the air hose and hit the middle fitting with some air to make sure the valve is opening fully before installing it on the car.