Oversprung wastegate?
#1
Oversprung wastegate?
Hello all,
I know this may be better suited in the "engine/turbo/drivetrain" forum, but 99% of those guys have never really driven their evo so I figured this would be a better forum.
I am currently running a full-race T4 twinscroll manifold with twin TiAL MVS wastegates. I run a hallman boost controller with the soft spring.
in the wastegates I am running 20 lbs of spring pressure.
with this setup I am getting some pretty large boost spikes while the motor is still cool (regular operating temp for the street). when the motor heats up I do not have this problem.
I was wondering if anyone else has run into this or a similar problem? I have a theory that as the wastegates heat soak, the springs become softer which in turn reduces my boost spikes.
I think that if I reduce the spring on the wastegate and rely more on the boost controller that this might reduce this problem.
FYI my target boost is 22-23 psi.
this graph is from a 20 minute session at NJMP
I know this may be better suited in the "engine/turbo/drivetrain" forum, but 99% of those guys have never really driven their evo so I figured this would be a better forum.
I am currently running a full-race T4 twinscroll manifold with twin TiAL MVS wastegates. I run a hallman boost controller with the soft spring.
in the wastegates I am running 20 lbs of spring pressure.
with this setup I am getting some pretty large boost spikes while the motor is still cool (regular operating temp for the street). when the motor heats up I do not have this problem.
I was wondering if anyone else has run into this or a similar problem? I have a theory that as the wastegates heat soak, the springs become softer which in turn reduces my boost spikes.
I think that if I reduce the spring on the wastegate and rely more on the boost controller that this might reduce this problem.
FYI my target boost is 22-23 psi.
this graph is from a 20 minute session at NJMP
#2
Evolved Member
iTrader: (47)
I had a Hallman MBC once. It stuck wide open and blew my head gasket. When I was having that diagnosed and replaced, the shop told me they see that quite a bit with the Hallman. So just my .02. I'm not running the $70 AMS one; super simplistic.
Some tuners will let the car spike and low boost to get the torque going. Have you asked your tuner about this? Or are you open-sourced?
Some tuners will let the car spike and low boost to get the torque going. Have you asked your tuner about this? Or are you open-sourced?
#3
I had a Hallman MBC once. It stuck wide open and blew my head gasket. When I was having that diagnosed and replaced, the shop told me they see that quite a bit with the Hallman. So just my .02. I'm not running the $70 AMS one; super simplistic.
Some tuners will let the car spike and low boost to get the torque going. Have you asked your tuner about this? Or are you open-sourced?
Some tuners will let the car spike and low boost to get the torque going. Have you asked your tuner about this? Or are you open-sourced?
I usually do let the car boost spike to get the torque up, but not a 6-8 psi spike.
Noted about the Hallman, ill have to keep an eye on it.
#4
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Location: Redmond - Lake Tapps ,WA
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I know this may be better suited in the "engine/turbo/drivetrain" forum, but 99% of those guys have never really driven their evo so I figured this would be a better forum
I tried running the stiffer springs, which required two, and didn't like it. I think I settled on the 10 lb or 14 lb single spring in the wastegate.
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