[Md05STI]

Originally Posted by boostedrex05

what kinda dyno did you make shy of 550whp on? I made 512 on a dyno dynamics stock engine stock heads and cam's 0 correction so it's really like 10-20% more from what i herd.

It was on a dynojet. The power is there though as the car has gone 10.83 @ 131 and trapped a best of 134mph.

[boostedrex05]

Originally Posted by Md05STI

It was on a dynojet. The power is there though as the car has gone 10.83 @ 131 and trapped a best of 134mph.

nice thats what I'm told I should be running on the C16 check it out..

(Junior Tuned)512whp Stock Motor STi - Page 2 - NASIOC

[riggy30]

Originally Posted by subydude1974

Basically the only benefits of the Cosworth Heads and Cams are if you are looking for more TOP End Horsepower. The Intake Valves flow 15% more and Exhaust Valves flow 31% more than stock which allows more fuel and air for High Horsepower applications.

This is exactly why subies have no top-end power, I think a good p&p head and/or after market head + cams would be a good way to broaden the power curve. Yes, subies make good power, but usually it's narrow, PEAK power... It really sucks though that we have to spend so much money to gain some top-end power...

[corey]

Originally Posted by riggy30

This is exactly why subies have no top-end power, I think a good p&p head and/or after market head + cams would be a good way to broaden the power curve. Yes, subies make good power, but usually it's narrow, PEAK power... It really sucks though that we have to spend so much money to gain some top-end power...

There is a happy medium with porting, though. We gain top end at the expense of low end.

[Neanderthal Racing]

Originally Posted by corey

There is a happy medium with porting, though. We gain top end at the expense of low end.

well said. unless it's a dedicated drag car, don't go nutz.

[Homemade WRX]

If 400 is the goal, forged pistons and toss in cams, springs and valves (if you have the money) to open up the top end flow.
Port work is only needed when you really want to start pushing it or really want to improve top end power as much as possible.

this is coming from someone who ports heads and builds enignes.

Save the money on the portwork, as you don't need it to reach your goal.

[riggy30]

Originally Posted by Homemade WRX

If 400 is the goal, forged pistons and toss in cams, springs and valves (if you have the money) to open up the top end flow.
Port work is only needed when you really want to start pushing it or really want to improve top end power as much as possible.

this is coming from someone who ports heads and builds enignes.

Save the money on the portwork, as you don't need it to reach your goal.

What do you think the total parts & labor cost would be for forged pistons, cams, springs and valves?

[vandersti]

Originally Posted by riggy30

What do you think the total parts & labor cost would be for forged pistons, cams, springs and valves?

If you were having this professionaly built you could expect to pay around $6k when all said and done. Now if you had the tools and the knowledge or could some how avoid the assembly costs. You could expect to pay $3k. I had a short block built. I provided the block, pistons, rods, rings, and gaskets to them. It still costed about 1500 dollars for them to assemble, install the parts, balance (all the way down to the clutch).

[Md05STI]

For 400whp I wouldnt even worry about springs and valves. But if you think you will want more power somewhere down the road go ahead and do it now. It will save you the time and money from having to pull the motor a 2nd time.