I already shipped it, Ill send the tracking number.

Just throwing it out there, that my intake manifold from this guy is awesome and you should all buy one.

Bookmarked for next year. This is much better than those JDM squares.

Thanks man, glad you like it.

does anyone know how to get a hold of gotpsi? i wanted a quote,i thought he had a site but i cant find it?

http://www.rpracingproducts.com/

Finally getting that manifold welded up?

--Ferdi

Hey guys, this is gotpsi, I have not been able to post or pm so the best way to contact me is through my web site listed above thanks.

i failed at making one

Thanks for that informative post

[IMG]https://www.miataturbo.net/attachmen...ine=1340773912[/IMG]

[IMG]https://www.miataturbo.net/attachmen...ine=1340773912[/IMG]

[IMG]https://www.miataturbo.net/attachmen...ine=1340773912[/IMG]

Here is some newer pics, and one of a flush mount velocity stack done recently.
Also shown in the pics is the new tapering runners.

NICE! Great work man...beautiful welds, rockin' velocity stacks! How tough was it to get them that flush?

It's easy to get them flush, the raised ones are harder.

Any reason for the taper on the runners? I noticed both you and begi started doing this with the most recent mani's

If you want to get scientific search for Venturi nozzle and Bernoulli. Interesting stuff.

To encourage uniform and smooth transition from the chamber to a high velocity runner, sharp edges tend to create turbulence which acts as a bottleneck to flow.

I'll look into it, thanks
isn't that what the velocity stacks are for?

sounded like he was explaining what the velocity stacks are for to me..

Just think of a tapered runner as a very subtle velocity stack. By starting out with a larger diameter than the intake port of the head the effective unrestricted flow area can be equivalent to that of the head intake port diameter.

Notice the smaller unrestricted flow CSA (cross sectional area) in the top image. this same effect happens at the base of the velocity stack although it is not shown in the picture. The tapered runner helps combat the effects of this turbulence.
https://www.miataturbo.net/attachmen...ine=1340813107

I get it, thanks. I guess what I should have asked is how significant the effect is (ie: how much you actually gain from it) but I have a feeling that has yet to be measured.

it's just good practice. you want good flow: use a stack. you want to stuff a ---- ton of air as fast as possible into a container: taper the runner to increase velocity.

Higher velocities usually mean a smaller boundary layer and a more turbulent flow which is good for air fuel mixture as well.