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
Smart quod bastardus
 
fredmeister's Avatar
 
Join Date: Oct 2002
Location: Baltimore, MD, USA
Posts: 2,235
Garage
how to adjust VDO boost gage

I have a VDO boost gage in the clock hole location that reads a little low. It is teed into the brake booster line as per standard practice.
I verified this against my LM-1 gage that is picking up a sigmal off the recirculating valve housing or after the outlet of the intercooler above the throttle plate.
When the boost on LM-1 says 13.5psi the VDO gage reads 0.75 bar on the needle or about 10.8psi. Only explanation I have for the large discrepency is pressure loss across the wide open throttle or VDO gage inaccuracy.
My question does anyone know how to rest the needle on the VDO gage by indexing it a little to match the LM-1 reading which I assume is dead nuts?
I don't want to send it away to Hollywood Speedo to get charged for this....want to do it myself.

Second question is how much pressure drop should be expected before and after throttle plate considering the source of my signals to each gage as described above?

Fred

__________________
1979 930 Turbo....3.4L, 7.5to1 comp, SC cams, B&B intercooler, Snow Perf water/meth injection, Rarlyl8 headers, Garret GTX turbo, 36mm ported intakes, Innovate Auxbox/LM-1, custom Manually Adjustable wastegate housing (0.8-1.1bar),--running 0.7bar max
---"When you're racing it's life! Anything else either before or after, is just waiting"
Old 03-11-2009, 12:28 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered User
 
Join Date: Mar 2000
Location: Auburn,In. U.S.A.
Posts: 2,449
Mr. Fred,

Can't help with the reset question. I did have the same problem with taping into the brake booster, not quite that much differential though. I ended tying into the waste gate boost line and it worked great.
Also if you have a telltale on your gauge they sometimes loosen up and the needle slips.

Cole
__________________
Cole - 80 930 "The Old Sled"
Mods: TurboKraft Custom IC, 934 Headers, GSX 61, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports.

Last edited by cole930; 03-11-2009 at 01:32 PM..
Old 03-11-2009, 01:29 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
DP935 member
 
kycarguy 935's Avatar
 
Join Date: Sep 2004
Location: Kentucky
Posts: 3,044
Fred there is a reset key made that fits in the center piece of the guage. I don't have one for mine but need to find one.
__________________

Porsche Slantnose M505 M506 group on Facebook.
https://www.facebook.com/groups/719995181372494/
Old 03-11-2009, 05:23 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Registered User
 
Join Date: Mar 2000
Location: Auburn,In. U.S.A.
Posts: 2,449
KY,

Do a search here I saw a post some time back that told who has them.

Cole

__________________
Cole - 80 930 "The Old Sled"
Mods: TurboKraft Custom IC, 934 Headers, GSX 61, Zork, Port Work, SC Cams, Air Mod Fuel Dist Relocated, Water Meth Injection, BL WUR, MSD 6530, Greddy EBC, Synapse Bov, Short 2nd & 3rd with 8:37 R&P, Wevo Shifter, Coupling, and Mounts, MTX-L SSI-4, Big Brakes, Rebel Coilovers, Bilstein Sports.
Old 03-11-2009, 06:33 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Reply

Thread Tools
Rate This Thread
Rate This Thread:

 


All times are GMT -8. The time now is 10:14 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2020, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2020 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.