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911st 911st is offline
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Join Date: Jan 2004
Location: Sacramento
Posts: 7,269
Originally Posted by cole930 View Post

Just talked with one of the original developers of the velocity cone
for Porsche CIS. He confirmed exactly what we were assuming.
He said it accelerated the metering plate faster from rest through
full movement of the lever and eliminated the plate stall inside
the venturi allowing full movement of the control plunger.
He said this was originally seen on an old Mercedes CIS and
they did some testing and then had one made for a 930 metering
plate and it worked so well they used them on their race motors
had them made locally and sold them through various Porsche
aftermarket suppliers.



I have been wondering about this for so may years.

Once I understood what we needed I knew righ away what the intent of those buggers were.

We have to get one of these on a dyno for a back to back on the AFR's.

I think the marketing people just did not know what they were truly for. Everone wanted less lag so that is what they tryed to tell them to do. I remember reading the pitch in the Automotion add (any one have a old copy). Another example of a good idea just getting lost.

If it works like it should it will be major. Do you realize how much time money and effort people have gone to to work around the metering plat stalling?

This could men no Fueler, high flow head, or other crazy stuff... for most internaly stock 3.3's up to 1 bar running biger turbos. For thouse that trully need it, it could even make the IA head tunable at the WUR w/o boost clamps or rpm switches.

I am so excited about this I think I am going to cry!
Old 03-06-2009, 02:25 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #30 (permalink)