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Discussion Starter #1 (Edited)
So I recently went back to the dyno expecting to make around 350 whp since the car traps 127 @ 2100 lbs. It ended up only making 320 on a partial graph since the rpm signal got lost. I didn't do anymore pulls because I was worried about the head gasket and I don't think the power would still be climbing.

Here's a run down on engine specs:
Stock Y7 Head Delta 272 Z6 Intake manifold 60mm tb
Chinese turbo 53mm/78mm compressor 56mm turbine
Cast Iron Exhaust manifold 3" open downpipe
75 degree ambient temp around 100 degree in the data log
23 psi of boost E85 fuel

I'm thinking of trying a locked vtec Z6 cam and if that runs okay trying a 59300. The car only gets driven to the track and back.

Am I wasting my time on this head or will the cam help it carry the power better? You can see on the dyno it's out of juice at 7300 rpm. I'm not even sure how aggressive the Delta 272 is since it still idles smooth and my butt dyno doesn't recall a big improvement.


Current Dyno


This is at 13 psi. Reference to get the rpms
 

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2005 Legacy GT
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1,754 Posts
At this point I think the cheapest ways for you to try to make more power and a new cam and a new turbo manifold, maybe some work on the intake manifold or a new one (I've seen a few people get good results from opening up the z6 manifold and cleaning up the inside). I don't know much about the differences in the non-VTEC heads, but 320 whp is not a slouch by any means.
 

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Discussion Starter #3
I'm hoping to make a new exhaust manifold after I take some tig classes in March. I had a blox intake manifold on it before and it really killed the low and mid range power. Do the skunk and edlebrock manifolds have the same sacrifice for more higher rpm power or was that manifold just crap? I actually enjoyed having the D15 intake manifold on the car for it's peppyness on the street but logic told me I needed to go bigger for more power.
 

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Premium Member
2005 Legacy GT
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1,754 Posts
I've heard of good results with the Edelbrock performer X (long runners) keeps everything a bit more low/mid rang than the Victor X (short runners). The Skunk2 for the D (I've heard) is basically a copy of the B series IM with a D series flange ... so not properly engineered for a D series application. I've also seen/read good things about Golden Eagle for an intake manifold.
 
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