intake manifold pics for my single FD project...
#52
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Originally Posted by 2a+RoN
here's a shot of the portmatched runners:
and here's one of the radius into the runners:
and here's one of the radius into the runners:
Good job!
#53
Originally Posted by silvr94r2
I'm suprised to see that. Most people do the raised velocity stacks which we've found to actually hurt flow and make tuning a pain in the ***.
Good job!
Good job!
#55
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There is nothing wrong with velocity stacks extending into the plenum. It works fine. The issue is plenum volume. In the case of this manifold, if they extended into it there wouldn't be enough area for air to move around them very well which would explain a lack of performance if there was one. If you make the plenum large enough, it won't really matter. I personally prefer them flat though as I like how open it keeps the plenum.
#56
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I don't doubt they work. They're proven to work. I actually had the issue of a smallish sized plenum, and saw them as being in the way and creating more issues than if the plenum just had them incorperated in the base. You also run into other issues with a plenum being too large and I bet the velocity stacks help resolve some of the issues associated with it.
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#58
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Like Crispeed said and i agree 100%......the raised velocity stack on a boosted application just don't cut it.
We've tested different manifolds and ALOT of different designs and none worked like the one pictured. It was soooooo much quieter on the flow bench which basically means it's flowing smooth.....better flow means more power and a higher and more stable tuning process.
I know one manifold we tested that had a larger plenum than ours and it also had raised velocity stacks.......it didn't even come close! It has been used on many cars with all things being equal and mirrors the results on the flow bench. Tuning it is a nightmare and it makes FAR less power.
We've tested different manifolds and ALOT of different designs and none worked like the one pictured. It was soooooo much quieter on the flow bench which basically means it's flowing smooth.....better flow means more power and a higher and more stable tuning process.
I know one manifold we tested that had a larger plenum than ours and it also had raised velocity stacks.......it didn't even come close! It has been used on many cars with all things being equal and mirrors the results on the flow bench. Tuning it is a nightmare and it makes FAR less power.
Last edited by silvr94r2; 03-22-06 at 03:28 PM.
#60
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Originally Posted by silvr94r2
Like Crispeed said and i agree 100%......the raised velocity stack on a boosted application just don't cut it.
We've tested different manifolds and ALOT of different designs and none worked like the one pictured. It was soooooo much quieter on the flow bench which basically means it's flowing smooth.....better flow means more power and a higher and more stable tuning process.
I know one manifold we tested that had a larger plenum than ours and it also had raised velocity stacks.......it didn't even come close! It has been used on many cars with all things being equal and mirrors the results on the flow bench. Tuning it is a nightmare and it makes FAR less power.
We've tested different manifolds and ALOT of different designs and none worked like the one pictured. It was soooooo much quieter on the flow bench which basically means it's flowing smooth.....better flow means more power and a higher and more stable tuning process.
I know one manifold we tested that had a larger plenum than ours and it also had raised velocity stacks.......it didn't even come close! It has been used on many cars with all things being equal and mirrors the results on the flow bench. Tuning it is a nightmare and it makes FAR less power.
-S-
#63
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Originally Posted by Zero R
My reasoning was the stacks would create turbulence in a enclosed plenum.
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#65
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Yeah n/a those stacks work great......boosted applications don't like them one single bit.
Zero R: they were up about 3/4" inside the plenum which doesn't seem like much.....but boy did it have a negative impact.
Zero R: they were up about 3/4" inside the plenum which doesn't seem like much.....but boy did it have a negative impact.
#66
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Yeah what I'm thinking is none, like you and Crispeed and I are saying, seems to make more sense since the air is being forced in rather than drawn in. I didn't have flow bench to go play on but everything I know tells me they would have hurt my app. If I could change one thing on mine I would have the base radiused as well, ie no flat floor. Air don't seem to like corners too much, but I would bet at 3bar it matters less. Even still good flow is good flow.
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Last edited by Zero R; 03-23-06 at 10:07 AM.
#68
You guys shoud check this intake out:
http://www.rossmachineracing.com/large/4g636.html
That same place sells all the materials to build some nice aluminum manifolds. they sell the velocity stacks etc. check out their intakes they sell fro the mr2 and stuff. nice stuff.
http://www.rossmachineracing.com/billetintakes.html
CJG
http://www.rossmachineracing.com/large/4g636.html
That same place sells all the materials to build some nice aluminum manifolds. they sell the velocity stacks etc. check out their intakes they sell fro the mr2 and stuff. nice stuff.
http://www.rossmachineracing.com/billetintakes.html
CJG
#69
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those look nice. I didn't go with aluminum with mine b/c 1) it's more expensive and 2) aluminum transfers heat very well, and I didn't want to transfer any heat knowing that the runners would have to be so close to the dp and turbo..
#71
Originally Posted by Rotortuner
You guys shoud check this intake out:
http://www.rossmachineracing.com/large/4g636.html
That same place sells all the materials to build some nice aluminum manifolds. they sell the velocity stacks etc. check out their intakes they sell fro the mr2 and stuff. nice stuff.
http://www.rossmachineracing.com/billetintakes.html
CJG
http://www.rossmachineracing.com/large/4g636.html
That same place sells all the materials to build some nice aluminum manifolds. they sell the velocity stacks etc. check out their intakes they sell fro the mr2 and stuff. nice stuff.
http://www.rossmachineracing.com/billetintakes.html
CJG
#72
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Originally Posted by Zero R
C'mon it's much more fun to weld.
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#73
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Originally Posted by mono4lamar
so no to velocity stacks... even the ones imbedded like of the entitled manifold in this tread? someone said make the runners run flat into the plenum...???
#74
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Originally Posted by crispeed
I've used the Ross MR-2 one. It works great. A fine piece of work too.