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
Registered User
 
Join Date: Mar 2013
Location: Nova Scotia, Canada
Posts: 323
Garage
I changed my boost spring (.9) out for a .7 bar one, my afrs are now fine all the way to 5600 rpm. I realize there is now less demand for fuel by doing this, but is there a chance while running 1 bar a few weeks ago for a day I could have damaged the over boost switch, or maybe the overboost relay is not doing what it should? The car is running almost normal right now with good afrs, (again only up to 5600 now). I'm not sure how this switch/relay work if it tapers off the fuel or if its a hard cut off when the switch is triggered...
__________________
1987 930 - 935 Tribute
1971 911T w/3.2 motor
Old 07-12-2014, 10:34 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #21 (permalink)
Registered User
 
Join Date: Jul 2006
Location: S. Florida
Posts: 7,289
It's very old technology so it's a hard cut by disconnecting the grounds to the two fuel pump relays. I don't think you'll hurt the overboost sensor on the manifold or intercooler by running over 1bar.
Old 07-12-2014, 10:41 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #22 (permalink)
Registered User
 
Join Date: Mar 2013
Location: Nova Scotia, Canada
Posts: 323
Garage
This is making me crazy, I took my WUR apart to make sure the diaphragm was okay - it was. I don't have the gauges to check my cis pressures but I will get them. I did the fuse panel mod today, checked and replaced most vac lines, checked intake manifold bolts, although wouldn't that give me a boost leak rather than a suction leak and cause me to run rich? I grounded the over boost cut off, same result. If my pressures were out I don't see how I would be getting perfect afrs from say 3000 rpm to 4500 rpm on boost full throttle, its just suddenly starts to go lean. It really seems like I have a fuel restriction somewhere... Also, I noted in another thread about a speed sensor under the driver seat... My 87 930 has nothing under the driver or passenger seat except the wires going to the harness for the seat itself...

Edit - also sprayed ether around intake manifold bolts, afr did not change. Made sure the test would work, checked by spraying some in the intake which richened up the afrs.
__________________
1987 930 - 935 Tribute
1971 911T w/3.2 motor

Last edited by ObrHaus; 07-13-2014 at 10:48 AM..
Old 07-13-2014, 10:41 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #23 (permalink)
Turbo Hooligan
 
Join Date: Sep 2007
Location: Greensboro NC
Posts: 1,246
Clogged fuel injector? debris in the fuel head? all is pure speculation until you know where your control pressure is set.
__________________
www.d-zug.com
blog.d-zug.com

All these guys do is drive too fast, work on cars, chase ******* and drink.. really no fun at all...
Old 07-13-2014, 12:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #24 (permalink)
Registered User
 
6771911esses's Avatar
 
Join Date: Sep 2002
Posts: 2,150
Vacuum advance of dizzy in order???? Bad coil or CD box? Sounds more ignition related now.
Old 07-14-2014, 02:38 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #25 (permalink)
Tinkering Pays!!
 
mooney265's Avatar
 
Join Date: Sep 2008
Location: New Orleans
Posts: 1,365
Garage
Quote:
Originally Posted by ObrHaus View Post
I took my WUR apart to make sure the diaphragm was okay - it was. I don't have the gauges to check my cis pressures but
Without CIS Gauges hooked up and a Mitey-Vac to simulate boost, you'd be hard-pressed to know how well your WUR is functioning...

If I didn't have: Adj WUR, CIS Gauges, Mitey-Vac and Wideband - - I'd be lost with my 930! Just a little adjustment makes a huge difference.

You need to be able to "simulate boost" on the WUR and see what's happening to your Boost-CP with Gauges hooked up...
__________________
LIVN80S - - Red '79 Porsche 930 Steel Slant Nose Conversion [in 1987] w. 46k miles 3.3L; 964 Cams; K27HF @ 1.0 BAR, with Garrettson Intercooler; Rarly Zork; CIS Flowtech Fuel Head & BL-WUR.
Old 07-14-2014, 11:20 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #26 (permalink)
Registered User
 
Join Date: Mar 2013
Location: Nova Scotia, Canada
Posts: 323
Garage
Brought a Snap-On CIS kit home, the fittings are too big so now I'm stuck until mid week try and get some different ones. I did check the return line and I'm getting 1100 cc's in about 22-23 seconds so I'm good there. I made a video so you can see whats happening. Its less dramatic with the .7 bar spring in but I don't want to accidentally toast my motor either. A little more rich with the .7 bar in down low obviously, was running .9 bar springs and 1 bar occasionally.

https://www.youtube.com/watch?v=FhoEb9z6hEQ
__________________
1987 930 - 935 Tribute
1971 911T w/3.2 motor
Old 07-19-2014, 05:44 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #27 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 11:55 PM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2019, 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.