Turbo Shuffle
Hugh
hugh at sol.co.uk
Tue Jul 31 14:28:06 GMT 2001
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Hi J=F6rgen / Mike D
Are the wastegates internal or external?
The HKS GT2530 has an internal wastegate.
Are any electronic boost control used?
The car uses an HKS EVC IV boost controller.
How does the intake plumbing from the two turbos merge?
There are two exhaust manifolds, one for each bank of three ( 6 cyl =
in-line ) going to the turbos.
The turbo outlets merge as the pipework runs forward to the =
intercoooler.
Another question is do the turbos have a compressor recirculation valve. =
It
sounds like the system is near the surge limit and the two are getting =
into
a harmonic.
There car uses airflow meters which also necessitates a re-circulating =
dump valve set-up.
I disconnected the vacuum line to the dump valves yesterday and this =
seems to have taken away a large part of the problem - though not all.
It may be there is some linkage with the turbo shuffle starting and the =
dump valves responding.
As the problem is most obvious between .2 and .8 bar boost, how is the =
vacuum line to the dump valves being activated.
Thanks for the responses.
Hugh
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<DIV>Hi J=F6rgen / Mike D<BR></DIV>
<DIV>Are the wastegates internal or external?<BR><FONT face=3DVerdana =
size=3D2>The=20
HKS GT2530 has an internal wastegate.</FONT></DIV><FONT face=3DVerdana=20
size=3D2></FONT>
<DIV><BR>Are any electronic boost control used?<BR><FONT face=3DVerdana =
size=3D2>The=20
car uses an HKS EVC IV boost controller.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV>How does the intake plumbing from the two turbos merge?<BR><FONT=20
face=3DVerdana size=3D2>There are two exhaust manifolds, one for each =
bank of three=20
( 6 cyl in-line ) going to the turbos.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2>The turbo outlets merge as the =
pipework runs=20
forward to the intercoooler.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV>Another question is do the turbos have a compressor recirculation=20
valve. It<BR>sounds like the system is near the surge limit and =
the two=20
are getting into<BR>a harmonic.<BR><FONT face=3DVerdana size=3D2>There =
car uses=20
airflow meters which also necessitates a re-circulating dump valve=20
set-up.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>I disconnected the vacuum line to the =
dump valves=20
yesterday and this seems to have taken away a large part of the problem =
- though=20
not all.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>It may be there is some linkage with =
the turbo=20
shuffle starting and the dump valves responding.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>As the problem is most obvious =
between .2 and .8=20
bar boost,</FONT><FONT face=3DVerdana size=3D2> how is the vacuum line =
to the dump=20
valves being activated.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>Thanks for the =
responses.</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2>Hugh</FONT></DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><FONT face=3DVerdana size=3D2></FONT> </DIV>
<DIV><BR><BR></DIV></BODY></HTML>
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