Boost cut
Boost cut
I'm pretty sure I already know the answer to this but I wanted to feel out your guys opinion. Car is 1JZ-GTE swapped with stock twins.
I recently threw a Turbosmart single stage MBC onto my stock twins. I T'd the wastegate lines to one side of the MBC and then blocked off the rear turbo pressure fitting and connected the front line to the other side of the MBC.
Before the MBC I would religiously hit 12psi. No more, no less. I have a massive front mount intercooler with 3" piping. Also a 3" Ypipe and downpipe. Stock catback.
After the MBC, even with it turned off, I hit boost cut at just under 14psi. In theory, with it off I should be at wastegate pressure and should only be seeing 12psi.
Now, I know the first answer will be "check your lines/wastegates"
I took the MBC off entirely and just ran my new hose configuration alone without the MBC in place.
The result? 12psi on the nose. Just like baseline.
Conclusion: The presence of the MBC alone causes a 2+ psi increase?? Thoughts???
I recently threw a Turbosmart single stage MBC onto my stock twins. I T'd the wastegate lines to one side of the MBC and then blocked off the rear turbo pressure fitting and connected the front line to the other side of the MBC.
Before the MBC I would religiously hit 12psi. No more, no less. I have a massive front mount intercooler with 3" piping. Also a 3" Ypipe and downpipe. Stock catback.
After the MBC, even with it turned off, I hit boost cut at just under 14psi. In theory, with it off I should be at wastegate pressure and should only be seeing 12psi.
Now, I know the first answer will be "check your lines/wastegates"
I took the MBC off entirely and just ran my new hose configuration alone without the MBC in place.
The result? 12psi on the nose. Just like baseline.
Conclusion: The presence of the MBC alone causes a 2+ psi increase?? Thoughts???
My theory is that the MBC T itself is probably causing too much of a restriction in air flow and not allowing the wastegates to open, which is bizarre with all the praise for how high quality Turbosmart is. Unless this is just a common known phenomenon associated with running MBC's
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thegadget
SC - 1st Gen (1992-2000)
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Jun 17, 2009 03:54 PM
