Sorry to Hi jack a thread on Head Gaskets again:
Hi Sydneykid, maybe I should put my build in perspective :
Done that !
Done that !
Additionally, with my setup pre Trust plenum, i had a custom front facing plenum (on stock extrusion honed runners) which was bench flow tested as OK, BUT when we put it on the car on 18+ PSI boost, leaked (bad tig welding), and physically breathed (ie you could see the plenum expand and contract on boost and off boost whilst on the dyno). (ie not strongly built)
My options at this stage were to :
a) Revert to standard plenum, which would have invovled expense in re-routing intercooler piping & TB.
B) Get another front facing plenum.
c) Fix the current plenum - which would have been relatively easy
I opted to 'go the whole hog' with the Trust plenum/intake as it was line ball on cost to me, since I didn't have the std plenum (top bit) any more.
Additionally, I was able to test std plenum and the results proved that the middle two cylinders receives a lot more air then the outer two (on each side). ie 240 cfm on 1,2,5,6 and 340 cfm on 3 & 4 - again this was on a bench. So at high boost, this was dangerous to my engine setup.
So I am hoping that my package will emulate the results that other high boost RB25DET cars have seen with the Trust plenum.
I can should be able to provide before before and after dyno readings for my setup (ie before Trust and after Trust) but like I said before, I had some issues with my old plenum.
As a side note, if you look at the design of the Trust plenum/intake, you can immediately tell that the unit has had much R&D - the lines, the curves, the way the intake flows accross all runners is just magic. There is no comparison to my old plenum.
Cheers,