Most Power Through An Afm In Standard Rb25 Location

[bubba]

Your dyno graphs on the previous page.. the run where you dropped the cat.. looks like it was going on to make a fair bit more power than the runs with the cat still attached...........

[Harey]

Your dyno graphs on the previous page.. the run where you dropped the cat.. looks like it was going on to make a fair bit more power than the runs with the cat still attached...........

I remember now the test was to verify whether the cat was causing a loss in response, so once that was ruled out, Trent abandoned the run.

I will get another run done without the cat but it doesnt look like a lot more does it?? I supposed hard to say where it will end up.

[tm_r33]

back to back dyno runs with different sets of cams can give some idea of how a certain cam may/will behave but i would not rely to much on the dyno results.

on road or track testing will provide more accurate data imo.

sure if you have two pretty close sets of cam shafts but one set has longer duration then sure.. it may make some more power up high.. BUT many other factors will effect how it performs in real life applications.

lobe profile. ramp rate. small/large throttle inputs. initial rpm/initial boost at point when WOT is applied. load (higher gear/uphill)

as a rough rule of thumb.. bigger duration will offer more top end power but will come at the price of low down response. so then you can play with lift as well. in my case i didnt go to crazy on duration but opted for huge lift. all this was done in the quest to keep the car snappy on the throttle if the rpm's get a little lower but we still needed the thing to breath and bigger lift obviously helps with this also. As far as i can tell.. big lift usually offers wins across the board but comes at the cost of needing to grind some meat out of your head and needing different valve springs.