Pelican Parts
Parts Catalog Accessories Catalog How To Articles Tech Forums
Call Pelican Parts at 888-280-7799
Shopping Cart Cart | Project List | Order Status | Help



Go Back   Pelican Parts Forums > Porsche Forums > 911 / 930 Turbo & Super Charging Forum


Reply
 
LinkBack Thread Tools Rate Thread
Author
Thread Post New Thread    Reply
one of the great unwashed
 
patkeefe's Avatar
 
Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
Aux air valve questions

I posted this in the Tech Forum, but maybe someone here can help a bit. Do 930's have AAV's?
Pat
__________________
Patrick E. Keefe
78 SC
01 Boxster
Old 11-23-2007, 01:59 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
resident samsquamch
 
sand_man's Avatar
 
Join Date: Oct 2005
Location: Cooterville, Cackalacky
Posts: 6,754
Yes. Of course I ditched this little gem along with my AAR ages ago!
__________________
-jeff
back in the saddle: '95 993 - just another black C2
*SOLD*: '87 930 GP White - heroin would have been a cheaper addiction...
"Ladies and Gentlemen, from Boston Massachusetts, we are Morphine, at your service..." - Mark Sandman (RIP)
Old 11-24-2007, 01:36 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered User
 
Join Date: Dec 2004
Location: Danville - CA
Posts: 1,259
I have heard that removing / bypassing these can make the car run better. Anyone have any instructions on how to do so.
__________________
Rob Montgomery
'88 Blk/Blk 930 ('Lucy') - Not Stock & Not Running
Old 11-24-2007, 07:40 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
one of the great unwashed
 
patkeefe's Avatar
 
Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
Well, I decided to ditch the AAV. I am keeping the AAR, as that does keep the idle up when cold, and it functions as it should. I'm still thinking about how the AAV affects warm start, as Brian alluded to in the linked post. I basically took Bosch's word for it on the warm start issue. So, the AAR now becomes the sole survivor of the ancilliary air devices on the SC...the AAV, decel valve, thermoswitch, and whatever other crap I deemed unnecessary is gone.

I would like to see a schematic of what 930's had, for reference, if anyone has one.
Pat
__________________
Patrick E. Keefe
78 SC
01 Boxster
Old 11-24-2007, 09:18 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered User
 
Join Date: Jul 2006
Location: S. Florida
Posts: 7,267
I know AAV is the auxilliary air valve that lets air bypass the throttle body to raise the idle during cold starts, and the WUR is the warm up regulator... but what is an AAR?

Only advantage to removing the AAV is loosing a tiny bit of weight... it won't make anything run better when warmed up, and the idle will be painfully low during a cold start without it.

The WUR is a major part of CIS so you can't remove that.

Is the AAR just another casual name for the AAV?
Old 11-24-2007, 02:27 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
one of the great unwashed
 
patkeefe's Avatar
 
Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
The AAR (auxiliary air regulator) is the electrically powered valve which is open when cold, and allows extra air to bypass the throttle. When it gets warm, the sliding disc in it closes the opening, and shuts off the bypass air. In my car, it keeps it from stalling when cold, so it is worthwile to have.

The AAV (auxiliary air valve) is a disc shaped thingy, which is plumbed in parallel to the AAR. From what I've researched on it, it closes at approximately 5" vacuum. It was put in theoretically to assist on warm start when the AAR is closed. Someone has suggested "right foot" as a viable alternative...I'll go with that!

As my car started life as an n/a 3.0L, I am blowing through devices that were meant to get sucked through. I have had intermittent long decel problems in the past, as though the decel valve were still there. Maybe this will fix that.

Pat
__________________
Patrick E. Keefe
78 SC
01 Boxster
Old 11-24-2007, 03:39 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
Registered User
 
Join Date: Jul 2006
Location: S. Florida
Posts: 7,267
OK, thanks for your descriptions.

I'm familiar with the high idle throttle bypass device on CIS and L-jetronic, and always called it an auxilliary air valve.

If your description is correct, then there is no AAV on '87 930 K-jetronic.
There is a large 3-4" diameter gold cad plated vacuum operated valve thing that looks alot like the one in the picture in the other post link but it is called a deceleration valve on an '87 930.
It is activated by manifold vacuum at the same time as the recirculation valve that recirculates boost pressure back to the inlet of the turbo when you lift the throttle quickly, while the deceleration valve does the same thing between the the intake manifold and the airbypass housing to cut down on the amount of air sucking down on the CIS metering plate.
Anotherwords it leans out the mixture to a degree on deceleration to lower emissions, use less gas, and maybe cut down on popping and flames coming out of the exhaust while decelerating.
The car will run fine without it, but will use more gas on deceleration.
Old 11-24-2007, 04:06 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #7 (permalink)
Registered User
 
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 2,831
"I would like to see a schematic of what 930's had, for reference, if anyone has one."

Here you go Pat. The RoW has a couple less parts on it...

__________________
'77 S with '78 930 power and a few other things.
Old 11-24-2007, 05:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #8 (permalink)
Crotchety Old Bastard
 
RarlyL8's Avatar
 
Join Date: Jan 2000
Location: Huntsville, AL
Posts: 13,527
Garage
The AAV is buried in the back of an SC but is located more forward and on the passenger's side of a 930. The AAV and decel valve look very much alike. The visual diference is that the AAV has both vac ports on one side while the decel valve has ports on both sides.

I removed these devices from both my SC and 930 with no ill affects. It is reversible but a pain to get to on the SC. I will say that if the AAV was working properly before the turbo addition then you may as well leave it in. Mine were removed to simplify the engine and because the AAR was not working optimally.
__________________
RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 11-24-2007, 07:01 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #9 (permalink)
one of the great unwashed
 
patkeefe's Avatar
 
Join Date: Apr 2004
Location: Ringwood, NJ
Posts: 2,850
Thanks Andy!!
__________________
Patrick E. Keefe
78 SC
01 Boxster
Old 11-24-2007, 07:02 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #10 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 08:21 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2018, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2018 Pelican Parts, LLC - Posts may be archived for display on the Pelican Parts Website -    DMCA Registered Agent Contact Page
 

DTO Garage Plus vBulletin Plugins by Drive Thru Online, Inc.