[enkeivette]

Originally Posted by Shaolin Crane

I also have to say i think there was a bit of miscommunication on my part as far as the terms of my engine,i didnt mean to come off as im going to make 800rwhp with 14psi of boost, just that i wanted to make sure i was understanding the equation for calculating boost, minus the variables set forth due to parasitic loss etc. My error and i hope this clears some stuff up

Not really. You need to calculate from gross hp, not flywheel hp with accessories and definitely not wheel hp, then you need to subtract parasitic losses.

Further, you don't have a 347 that makes 430whp with only 9.5:1 compression. A 9.5:1 347 with TF or AFR heads will make closer to 450 gross hp, with a nice tune, with the right cam, if you're lucky.

So let's play with rough math:

450 gross hp - 5% for accessories and exhaust and - 15% for a standard trans driveline and a solid diff = 360 wheel hp.

800whp/ 360 whp = 2.22. Which is 1.22 x stock whp.

1.22 x 14.7 = 17.9 lbs of boost, not including blower loss!

So my guess, you'll need closer to 20lbs of boost to get to 800whp with a 347 running Trick Flow 185s and a fatty cam.

[94cobra69ss396]

KJ, the Tech Editor for 5.0 Mustang & Super Fords magazine built a 347 (4.125 bore x 3.25 stroke) that made 800rwhp with a Novi 2000 and I believe something in the range of 18psi. He also used AFR 205 heads and a somewhat mild hydraulic roller that had .600+ lift and 230/240 duration. You can read about it on their website.

[Vettezuki]

Originally Posted by 94cobra69ss396

KJ, the Tech Editor for 5.0 Mustang & Super Fords magazine built a 347 (4.125 bore x 3.25 stroke) that made 800rwhp with a Novi 2000 and I believe something in the range of 18psi. He also used AFR 205 heads and a somewhat mild hydraulic roller that had .600+ lift and 230/240 duration. You can read about it on their website.

At 18PSI were they running pump gas?

[94cobra69ss396]

Originally Posted by Vettezuki

At 18PSI were they running pump gas?

I don't remember. I doubt at that level he was.

[enkeivette]

With around 9:1 intercooled I'm supposed to be able to run 19lbs intercooled off 91 octane with AL heads.

18lbs sounds more like my math.

[Shaolin Crane]

Originally Posted by enkeivette

Not really. You need to calculate from gross hp, not flywheel hp with accessories and definitely not wheel hp, then you need to subtract parasitic losses.

Further, you don't have a 347 that makes 430whp with only 9.5:1 compression. A 9.5:1 347 with TF or AFR heads will make closer to 450 gross hp, with a nice tune, with the right cam, if you're lucky.

So let's play with rough math:

450 gross hp - 5% for accessories and exhaust and - 15% for a standard trans driveline and a solid diff = 360 wheel hp.

800whp/ 360 whp = 2.22. Which is 1.22 x stock whp.

1.22 x 14.7 = 17.9 lbs of boost, not including blower loss!

So my guess, you'll need closer to 20lbs of boost to get to 800whp with a 347 running Trick Flow 185s and a fatty cam.

yeah i hadnt gotten to the accessories math yet, just was trying to understand the basic boost to CR, then i would move on from there, i wanted tosee if i could get a more exact rather than "should be in the ballpark..."

[joedls]

I'm assuming this is a Ford. What block do you plan to use? A stock 5.0 liter block will crack right down the middle before you make anything close to 800 WHP.

[Vettezuki]

Originally Posted by joedls

I'm assuming this is a Ford. What block do you plan to use? A stock 5.0 liter block will crack right down the middle before you make anything close to 800 WHP.

Even with the billet main supports and valley girdle or whatever the hell it's called. (Though a hi-perf block is the right way to go at this power level.)

[94cobra69ss396]

I think I heard him say something about already having a Dart block at the cruise.

[Shaolin Crane]

Dart iron eagle, with a probe dominator 347 rotating assembly