i just realized i have some interesting data from my dyno pulls a few days ago.
i have three pulls where between the pulls almost nothing changed except the boost pressure:
first pull @ 10 psi
206 whp, 260 wtq
second pull @ 13 psi
226 whp, 284 wtq
third pull @ 17 psi
248 whp, 301 wtq
now these boost numbers are accurate to within +/- 1 psi, during the pulls i wasnt paying that much attention to them because i was only interested in getting to 17 psi.
so as you can see its about 6 hp per psi
now if i want 350 whp at 25 psi i'm going to need 12.75 hp per psi...NOT BLOODY LIKELAYYYYY
for what thats worth
this is a modified 2.5 turbo, another thread by me details the mods, i suppose the important parts for this discussion is the fact i have a stock un-ported fast burn head, unported manifolds, and a crappy catalytic converter installed
things that may have changed between pulls are changing the timing from 12 BTDC to 10 BTDC, and decreasing the fuel pressure 1 psi, and the time between pulls, and the general heat soak of the engine
i have three pulls where between the pulls almost nothing changed except the boost pressure:
first pull @ 10 psi
206 whp, 260 wtq
second pull @ 13 psi
226 whp, 284 wtq
third pull @ 17 psi
248 whp, 301 wtq
now these boost numbers are accurate to within +/- 1 psi, during the pulls i wasnt paying that much attention to them because i was only interested in getting to 17 psi.
so as you can see its about 6 hp per psi
now if i want 350 whp at 25 psi i'm going to need 12.75 hp per psi...NOT BLOODY LIKELAYYYYY
for what thats worth
this is a modified 2.5 turbo, another thread by me details the mods, i suppose the important parts for this discussion is the fact i have a stock un-ported fast burn head, unported manifolds, and a crappy catalytic converter installed
things that may have changed between pulls are changing the timing from 12 BTDC to 10 BTDC, and decreasing the fuel pressure 1 psi, and the time between pulls, and the general heat soak of the engine