Ok I finaly got it done, due to the weirdness of the Superflow variable baseline dyno, please ignore the seemingly low peak hp figures as this would probably at least be 205 whp on a dynojet or JWT's Dynopack. I will get results on the best combo on a more normal dyno when I tune the thing.
As a recap, this is a bone stock bottom end SR20VE with an N1 intake manifold and N1 camshafts with JWT adjustable timing gears with the cam timing adjusted +5 on the intake and -5 on the exhaust. It has a JWT ECU with the program developed by Big Tom for Silver John. It has a Cobra MAF and a custom 3" CAI with a ram air box.
Run 55 is the Hotshot Gen 6 header as you can see the Gen 6 didnt do to bad, I think the variable cam timing nullifes some of the potential that the merged collector gives for bottom end power with really big fixed cams like the good old DE.
Run 57 is the SR20Turbofreak production header 4-1 32” 1.75 primaries, merged collector, no megaphone. It pretty much kills the Gen 6 until the last 700 rpm of the powerband. It has much more area undder the curve than the Gen 6. It makes the most midrange power and torque of all the combos.
Run 63 is the SR20Turbofreak custom header 4-1 25.5 primaries with two steps, 12.75” long 1.75" diameter, second step 12.75” long 1.875” diameter, Burns merged collector 2.385 venturi, megaphone with reverse cone. Suprisngly this didnt do all that great, the production header is slightly better.
Run 61 is the SR20Turbofreak custom header 4-1 25.5 primaries with two steps, 12.75” long 1.75" diameter, second step 12.75” long 1.875” diameter, Burns merged collector 2.25 venturi, megaphone with reverse cone. This is the winner, suprisingly the smaller venturi kicks ass everywhere, especialy on the top end. It makes about 7 more peak hp than the Gen 6 and more power just about everywhere else. This is the design using Burns X design softwear. Apparently X Design kicks ass much more than Mikes brain.
The moral of the story is that the guys at Burns are pretty smart, a lot smarter than any of us at this game.
Remember this is a load cell dyno and it loads the engine differently than a dynojet or a Dynopack depending on how its calibrated so its important to look at the comparison rather than the peak numbers.
I will tune on a normal dyno, put an underdrive pulley and probably get a few more hp out of this and I will post the results in a couple of weeks.
I am hoping for 210 bolt on hp at the least.
