Just trying to help those like me who are on a budget and using this manifold....here is what i have done to stop make teh manifold less prone to cracking and solve the boost creep/spike problem associated with the stock wastegate placement/outlet...Holds 14psi steady all the way to redline



And to support the turbo...

 

ive always wondered how/why the placement of the wastegate outlet affects boost creep? does it have to bet placed between certain cylinders (2-3 in this case)? what if u just cut off the waste original waste gate position and placed it in front?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sp00n'd Supra &raquo;</TD></TR><TR><TD CLASS="quote">ive always wondered how/why the placement of the wastegate outlet affects boost creep? does it have to bet placed between certain cylinders (2-3 in this case)? what if u just cut off the waste original waste gate position and placed it in front?</TD></TR></TABLE>

they say it creeps from the angle of the flange,pointing up,so it is againt the flow of the exhaust.so it does not let the wastegate get full flow.

did you have creep before you did this mod to the manifold?what wategate are u using with what psi spring?

 

my buddy has the meng manifold w/ tial 38mm with zero creep... Some of the welds on the inside of the flange on his were kinda sloppy, so i told him to smooth the inside welds, and maybe thats why it isn't... But he's runnin .5 bar with zero problems

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sp00n'd Supra &raquo;</TD></TR><TR><TD CLASS="quote">ive always wondered how/why the placement of the wastegate outlet affects boost creep? does it have to bet placed between certain cylinders (2-3 in this case)? what if u just cut off the waste original waste gate position and placed it in front?</TD></TR></TABLE>

taken from tials tech page... generally applys to all wastegate placement though.

"In a perfect world you would select a mounting location for our wastegate that allows the gate equal access to all cylinders or rotors. This promotes equal exhaust port pressures between cylinders/rotors and avoids mysterious tuning problems resulting from uneven exhaust port back pressures. Another aspect to keep in mind is the high velocity of the exhaust gas inside the exhaust manifold, sometimes exceeding 800ft sec. Gas that is traveling at such high velocities will not easily make 90 degree turns of zero radius into the wastegate inlet. Remember Newton's second law, "bodies in motion tend to stay on motion". That particle of air is not particularly inclined to make a 90 degree turn and 800ft/sec. It must be persuaded to do so by giving it a gentle radius and easy access to the exhaust flow. Simply welding the gate to the side of a tube may work in some cases where the manifold back pressure is thru the roof, but in modern high efficiency turbochargers the pressure inside the manifold can be quite low and special through should go into wastegate runner geometry. "

 

You need to get rid of that 90 degree fitting coming off of your turbo oil drain, that thing needs to come straight down to the oil pan, your turbo seals will thank you.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by civictypenos &raquo;</TD></TR><TR><TD CLASS="quote">
they say it creeps from the angle of the flange,pointing up,so it is againt the flow of the exhaust.so it does not let the wastegate get full flow.</TD></TR></TABLE>

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by twkdCD595 &raquo;</TD></TR><TR><TD CLASS="quote">
taken from tials tech page... generally applys to all wastegate placement though.</TD></TR></TABLE>

AHH, makes perfect sense now, thanks guys!

 

off topic, but is it terribly bad to run an external wastegate off the turbine side of the turbo? i'm runnin an hks manifold meant for internally wastegates. so to add a tial, my buddy made me a custom downpipe which uses the little hole on the turbine to feed exhaust to the wastegate. i am curious cuz i've heard this is a bad setup, but i havent had any problems nor have i had boost spiking.



Modified by reaction360 at 3:08 PM 10/21/2003

 

no,thats not bad unless you get into high boosting,like over 12 - 15 maybe,but depends on the construction of the flange probably.

 

good thread, good info

 

good info!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by reaction360 &raquo;</TD></TR><TR><TD CLASS="quote">off topic, but is it terribly bad to run an external wastegate off the turbine side of the turbo? i'm runnin an hks manifold meant for internally wastegates. so to add a tial, my buddy made me a custom downpipe which uses the little hole on the turbine to feed exhaust to the wastegate. i am curious cuz i've heard this is a bad setup, but i havent had any problems nor have i had boost spiking.
</TD></TR></TABLE> https://honda-tech.com/zerothread?id=641663