924Board.org

[ideola]

Functionally speaking, what is the difference between these two different styles of plumbing a dual port / tee style manual boost controller (MBC)?

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erstwhile owner of just about every 924 variant ever made

[morghen]

well the inline MBC that you have on the left uses a spring and ball system to keep the port open and then shut it at your dialed boost pressure.

The T boost controller on the right does not use a sprin or ball.
The screw has a cone shaped end that closes on a cone shaped body.
So the port is always open but because of the cone design and threaded advance-retract system the pressure can be regulated...how? i'm not 100% sure but i think that the thread and cone provide a VERY fine adjustment of the area between the body and the screw so more or less air can move trough.

in any case..it is known that the T style controller is way better for the system as it is not brutal ON OFF but has a fuzzy output signal.
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Supercharger and EFI kits
https://www.the924.com

[ideola]

morghen, you mentioned in the thread that yours was a Forge Motorsport product. Is this the one?


I don't see anything on their site that references the V- arrangement you've discussed here and in your other thread...
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erstwhile owner of just about every 924 variant ever made

[stevekat]

Looking at the diagrams, it is possible they are not necessary intended to be different. The second drawing could be intended as Morghen described, but I usually see discussion comparing the MBC diagram juxtaposed with a controller inline for a single port waste gate. The second drawing may just be a sloppy way of describing the first configuration when comparing it to a single port.
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"Never get out of the boat. Absolutely goddamn right. Unless you are goin' all the way."

Gone to new home: '81 924T, US version, CGT Intercooler, UTCIS-PT, Euro DITC, Greddy Trust MBC, Forged Fuchs Flat Dish 6's, Factory Recaro's.