Originally Posted by VNeBLOB42
Spring is based upon vacuum PSI only. Not Boost psi. Not sure how to test the vacuum.
Originally Posted by bboy8282
If the standard spring that comes with the Tial bov is good for 11psi...does that mean those running stage 1 and stage 2 cobb tunes need to buy a new spring since cobb's PSI is generally around 14-18
Also, how do you check your vacuum
No one has a boost gauge or datalogs?
I just picked up a JB, I have a Tial Q that I was going to use on my other car (before I got my E90) so I'm trying to figure this out too...
11 psi spring if the car pulls at least 20 or more inches
10 psi spring if it pulls between 16 and 19 inches
Can anyone w/ boost logs/gauges chime in on what their N54/N55 pulls at idle?
Seems like the 10 psi spring would be more appropriate based on that video & the pdf here http://forums.n54tech.com/showthread.php?p=235554