Boost controller vacuum lines (most importantly the controller to the wastegate) should be kept as short as humanly possible.
Quote:
Originally Posted by MrFixIt
Besides possibly kinking or damaging the vac line, is there any detrimental effect of running lines that long? Like, 4-5 feet?
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YES! More air has to change pressure before the wastegate opens... basically guarantees boost spike.
Quote:
Originally Posted by BustedS13
mr2 guys run manual boost controllers into the cabin all the time. although i somehow feel the routing would be shorter.
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The engine bay is directly behind the driver's seat, running vac lines into the cabin would still keep them very short.