Hap? -- Re: [s-cars] EMRE: turbo flanges et al.

[Lewis, Gary M]

Maybe this will help.  We all call him "412"...

http://forums.audiworld.com/s4s6/msgs/14250.phtml

Gary Lewis

1995.5 S6 Avant, Green/Ecru, RS2 MAF, RS2 Exhaust Manifold, RS2 Injectors, Custom Turbo (K26 Turbine, Factory K26 Cold side (Audi Works '999' P/N) with 50mm intake and custom Innovative Turbo compressor wheel), TurboXS Type 25 Bypass Valve, Bilsteins, Eibachs, Big Reds, Spec II Clutch.



-----Original Message-----
From: Bill Clancy [mailto:clancybill at yahoo.com] 
Sent: Sunday, May 23, 2004 8:47 AM
To: mlped at qwest.net; CaptMagu at aol.com; ray at s-cars.org; Lewis, Gary M; Djdawson2 at aol.com; sola4est at yahoo.com; s-car-list at audifans.com
Subject: Hap? -- Re: [s-cars] EMRE: turbo flanges et al.


can someone clue me in as to who Hap is?    Many of you refer to him but I
don't see an email address that looks like that.

----- Original Message ----- 
From: "mlp5" <mlped at qwest.net>
To: <CaptMagu at aol.com>; <ray at s-cars.org>; <gary.m.lewis2 at boeing.com>; <Djdawson2 at aol.com>; <sola4est at yahoo.com>; <s-car-list at audifans.com>
Sent: Sunday, May 23, 2004 6:34 AM
Subject: RE: [s-cars] EMRE: turbo flanges et al.


Hum, thanks Hap.  I hadn't thought of it this way.  Seems counter intuitive at first, but as one thinks about is it could make sense that with a larger turbo and, presumably a larger exducer bore etc. in the hot side scroll you would be moving more gas past the blades without the need to provide as much pressure release by bypassing them.

I supposed a smaller bore could also be argued to also provide more control "resolution"  Certainly as a WG valve gets bigger, I can see where you would start to get an "On/Off" sort of pressure delivery/control.  Of course the above only makes sense to me if I'm correct in the assumption that the current WGFV & is APEX'i AVCR counterpart are capable of delivering "partial" relief modulation ~ if that's the case, the parts involved must be balanced (i.e. tunned) in some fashion to work properly together.

Sounds like what one needs is a pressure gauge/sensor/port plumbed into the either the exhaust manifold or turbine scroll and a way to plot exhaust manifold/hotside scroll turbine propulsion pressures against intake manifold boost and WGFV duty cycles.

Since our WG don't vent to atmosphere, I wonder what other, if any adjustments, are made to allow for post turbo exhaust pipe pressure?  I do know I've seen "general" recommendations &/or comments that WG gases be brought back into the primary exhaust gas stream as far downstream from the turbo as possible.

mike


-----Original Message-----
From: CaptMagu at aol.com [mailto:CaptMagu at aol.com]
Sent: Saturday, May 22, 2004 10:05 PM
To: mlped at qwest.net; ray at s-cars.org; gary.m.lewis2 at boeing.com; CaptMagu at aol.com; Djdawson2 at aol.com; sola4est at yahoo.com; s-car-list at audifans.com
Subject: Re: [s-cars] EMRE: turbo flanges et al.


Mike

If and when we do figure out the actual measurement, I do have an explanation if it is smaller. On higher boost applications, you don't want a bigger hole. You want a smaller hole since less of the exhaust is going to be vented out the wastegate. I've been researching wastegates for my new tubular manifold on the Tial website. I'm probably going to stick with the stock WG.

Hap, researchin dahkine wastegates in Evahboost, Maguire

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