[Diy_efi] : tuned port manifolds

[Jesse Ruppel]

> -----Original Message-----
> From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On
> Behalf Of Bruce
>
> Turbo at mid engine, large heavy cast manifolds.
> If they have a dual scroll housing then use it.
> Turbos are about heat.  All them pretty headers and such have huge amounts
> of suface area, and radiate lots of heat that could be used by the turbo.
> If you have a stock cast manifold, might just really smooth it up
> to reduce
> it's surface area, and use that.
> Bruce

	This is an excellent point that I did have in the back of my head, but I
wasn't quite sure if the heat or pressure dominated.  It is very obvious
that even a ceramic coated header is going to considerably reduce the
temperature at the turbine inlet, as well as increase the underhood
temperatures.  I have the OEM cast manifold, and I could use that if I just
made an adapter for a T4 flange that included a wastegate port.  HKS makes a
cast manifold that has large diameter and larger radius bends in it, as well
as a port for an external wastegate.  They are $650 new, but I'm starting to
think I would really like to find a used one now.  I was also thinking about
fabing a very short "log style" manifold from schedule 40 elbows, though by
the time I added up the cost to water jet the flanges and all the labor
involved, the HKS manifold started to sound more attractive.

	If anybody is interested, here is a picture of a header for a 7M-GTE that
Sound Performance is selling for ~$2200.  I am sure no analytical modeling
time went into its design...  For that kind of money, I'm not impressed.
Same turbo and wastegate that I will be using though.

http://www.supraforums.com/attachment.php?s=&postid=310324
http://www.supraforums.com/attachment.php?s=&postid=310325

Thanks for the help,

Jesse Ruppel
ruppeljw at capital.net

87T Supra
87T 4x4 Pickup



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