Tonight, was the big night on the dyno. And I wanted to engine dyno the thing but as it turns out the turbo setup would not fit without making a custom bell housing for the engine dyno. So good old AWD dynodynamincs is in order.
First off a big thanks to Shane and DB Performance for making this possible. The car did make Great power, then we found our wall, and it was 2 fold.
So I wanted to get the car back to the 650 or so it was last year so I could hammer out the 60'. Then if things were going well we could turn it up a little and see where the wall was, or the limiting factor.
So we tried a few runs at base WG pressure, or what we thought was going to be WG pressure. It ended up running 40psi with a line from the compressor housing to both WG's. I do not know why that is but the WG springs are 24psi springs, so last year it would run 26psi, so I figured it would be about 26-28psi. Not the case, here it is at 39psi and reving to almost 10k, it just keeps going and going.
So we proceeded to up the boost cut, based on the psi graph I figured it was going to run 35-38psi on WG springs. We checked with an air gun and the WG valves did move just fine. And in the end it was almost 40psi for spool up then settled at 38-39psi. This made 720 awhp, so upping the boost about 1psi from last year made 70 more ahwp.
So after all this we put in the boost controller and upped it to 45psi, the ignition cut out like a rev limiter and the car made 789 or something, then after some poking we made the 816.6 AWHP and 538 ft/lb at 45psi tappering down to 43psi at the 816hp mark and 42psi at red line. But we had to run more ignition timing to get a clean pull then we wanted to, so it lifted the head on the end of this run. But we turned it back down to 36psi and it made 689ahwp, so that will be my new base PSI, and up it a little from there to around the 720awhp as traction permits.
Then if I want more power I need a better ignition system, and a head with more deck thickness then the one I have now. The head I have on there now is decked a lot, the oil passage up into the head from the head stud hole is not very thick, and I might need to drill and weld in some supports in the deck surface of the head in between the head studs to get this thing to hold enough cylinder pressure to make the power its capable of.
I would need to up the base fuel pressure from 38psi to about 45-50psi, not a big deal with the fuel pump I have. Then up the boost to 50 some PSI and I think the car could make just over 900AWHp. But the setup has a long way to go before I could use that power, but on a dyno day it would be fun.
I will update with a Shootout mode graph at some point, this number was at 976 awhp.
~John
Linear Mode
