996 Turbo / GT2 Turbo discussion on previous model 2000-2005 Porsche 911 Twin Turbo and 911 GT2.

Playing with the welder. New plenum

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Old Aug 16, 2010 | 01:43 PM
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The tig welders I follow still use ceramics just alot of them, n change cup sizes frequently
 
Old Aug 16, 2010 | 03:33 PM
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For self-fabricating purposes, you'd be surprised just how forgiving fluid dynamics can be in a turbo-charged engine. Your 90 degree bends probably wouldn't have hampered airflow as much as you think compared to the streamlined ones...
 
Old Aug 16, 2010 | 03:41 PM
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Originally Posted by Troy Jollimore
For self-fabricating purposes, you'd be surprised just how forgiving fluid dynamics can be in a turbo-charged engine. Your 90 degree bends probably wouldn't have hampered airflow as much as you think compared to the streamlined ones...
Yes, indeed. It's amazing what will make power (think log manifold)

However, smoothing out all the turbulence and evening out air flow to each cylinder is critical at 'under the curve' power, which is what I'm after. I'd much rather have a car that makes 500hp at 2500 rpm and peaks at 550hp at 6500rpm than have one that makes 200 at 3500 and 800 at 7000rpm.
 
Old Aug 16, 2010 | 04:05 PM
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I was thinking more along the lines of having positive pressure 'filling' the intake tubes as opposed to a N/A engine needing to suck in as much air as it can. Straight-line shots and smooth curves would seem to be much more critical in that environment (like a GT3 ).
 
Old Aug 16, 2010 | 07:50 PM
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Indeed, and it's a very valid point. This stuff is therapeutic for me and I have the equipment laying around, so I might as well geek out on it. If I don't, my fabrication skills get rusty over time and I end up learning lessons over and over.
 
Old Aug 16, 2010 | 08:37 PM
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Originally Posted by Sunnyside
Hi Brad,
Enough already, you know the welds look great .( modesty modesty modesty .lol)
If I had done the welding it would have been with s/s mig wire & pure Argon and wouldnt have looked 1/4 as good as yours.

Well done.
Frank.
"
Did you mean Tri Mix for "MIG" with stainless?
 

Last edited by cjv; Aug 16, 2010 at 08:40 PM.
Old Aug 16, 2010 | 08:52 PM
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Originally Posted by Brad Bedell
Yes, indeed. It's amazing what will make power (think log manifold)

However, smoothing out all the turbulence and evening out air flow to each cylinder is critical at 'under the curve' power, which is what I'm after. I'd much rather have a car that makes 500hp at 2500 rpm and peaks at 550hp at 6500rpm than have one that makes 200 at 3500 and 800 at 7000rpm.
Is this 996tt manifold what you had in mind?

 
Old Aug 16, 2010 | 09:21 PM
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Originally Posted by cjv
Is this 996tt manifold what you had in mind?

* peers into the runners blows some air in with lungs nope flow sux, next!!
let's get one of those log manifolds and rough the surface to promote turbulent flow ;-)
 
Old Aug 16, 2010 | 09:36 PM
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Originally Posted by OS Inspector
* peers into the runners blows some air in with lungs nope flow sux, next!!
let's get one of those log manifolds and rough the surface to promote turbulent flow ;-)
Can't think of anyone who would want to flow a log manifold?



Now back to the topic.
 
Old Aug 16, 2010 | 09:40 PM
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Originally Posted by cjv
Is this 996tt manifold what you had in mind?
That's pretty slick...I think I'll stick with the 997 gt2 tanks, something tells me that diminishing returns kicked in on that intake about, say 600 hours ago...
 
Old Aug 16, 2010 | 09:43 PM
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Originally Posted by Brad Bedell
That's pretty slick...I think I'll stick with the 997 gt2 tanks, something tells me that diminishing returns kicked in on that intake about, say 600 hours ago...
And to think ........ after 598 hours I realized I couldn't weld carbon fiber.
 
Old Aug 16, 2010 | 09:55 PM
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Originally Posted by cjv
And to think ........ after 598 hours I realized I couldn't weld carbon fiber.
But it makes pretty sparks when you apply electricity to it.

I figure you've got several weeks into air flow bench research, even with computer modeling, there's no substitute for that time.
 
Old Aug 16, 2010 | 10:03 PM
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Originally Posted by Brad Bedell
But it makes pretty sparks when you apply electricity to it.

I figure you've got several weeks into air flow bench research, even with computer modeling, there's no substitute for that time.
Computer modeling? Here is one of many for our CF piece. The flow testing was important, however more important was the pton testing to identify any negative pressure areas. Negative pressure areas were the downfall of the above aluminum modified Porsche WC plenum. It flowed fine, simply wasn't balanced.

Brad, thanks for the kind words. I apologize for taking your thread off topic.

 

Last edited by cjv; Aug 16, 2010 at 10:10 PM.
Old Aug 17, 2010 | 07:14 AM
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That's just plain geeky. Cool!
 
Old Aug 17, 2010 | 06:03 PM
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You go stuffing spaghetti into your fancy intake like that, something's gonna break... Just sayin'... *Laugh*
 


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