Losing boost?
#1
Losing boost?
Lately I've noticed that My boost os dropping at high rpms.
Previously I had an unported S5 turbo/wastegate with RB 2.5 dp and silencer to 3inch CS catback.
No boost controller.
I would creep to 10psi easily in 4/5th and around 8psi in lower gears.
I ported the waste gate a month or two ago and put on a MBC. I set it for 7-8psi.
Lately I've noticed that it will go right up to 8psi but then rapidy drop to 5psi in the high rpms.
I didn't think that it would happen on my setup. I figure the exhaust flows enough that this shoudln't happen.
Now I do live in AZ where it's 90+ outside even at night. Could heat soak cause anything like this?
I do have a vac leak at the entrance to the turbo on the TID but it shouldn't affect boost right?
4/5th gears hold 8psi no problem.
thx
Previously I had an unported S5 turbo/wastegate with RB 2.5 dp and silencer to 3inch CS catback.
No boost controller.
I would creep to 10psi easily in 4/5th and around 8psi in lower gears.
I ported the waste gate a month or two ago and put on a MBC. I set it for 7-8psi.
Lately I've noticed that it will go right up to 8psi but then rapidy drop to 5psi in the high rpms.
I didn't think that it would happen on my setup. I figure the exhaust flows enough that this shoudln't happen.
Now I do live in AZ where it's 90+ outside even at night. Could heat soak cause anything like this?
I do have a vac leak at the entrance to the turbo on the TID but it shouldn't affect boost right?
4/5th gears hold 8psi no problem.
thx
#2
boink.
I just turned up the boost to 9-10psi.
It doesn't lose the boost as quickly but it still drops atleast 2psi in the 5.5k+ range.
Maybe a boost leak which only surfaces under higher pressures?It doesn't hesitate though so I doubt it.
This normal with a ported WG?
I did port a the side closest to the DP a bit more to make a better flow and it does leave 2-3mm's open even with the flapper completely shut. It wouldn't cause this though?
I just turned up the boost to 9-10psi.
It doesn't lose the boost as quickly but it still drops atleast 2psi in the 5.5k+ range.
Maybe a boost leak which only surfaces under higher pressures?It doesn't hesitate though so I doubt it.
This normal with a ported WG?
I did port a the side closest to the DP a bit more to make a better flow and it does leave 2-3mm's open even with the flapper completely shut. It wouldn't cause this though?
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