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
 
Join Date: Dec 2013
Posts: 106
cam sensor

hi guys
i need to install the cam sensor for my motec M48 - with new 900CC i need to do sequential fuel injection and not 3 groups
since the engine is from 964 and its on 911 - 1977 i have blocked the power steering cam with Albert from going super fast . the one with the honeywell sensor.
did anyone succeed to install one of this ? did i need to add something to camshaft it self since there is only a hole to thread ?
did same one have any picture after he made it ?
i have send E-Mails to Albert but he is not answering me for quite a while
so i need Help ..... big Help
thank you in advance

Old 04-17-2020, 10:46 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #1 (permalink)
Registered
 
Join Date: Dec 2011
Location: Virginia Beach, VA
Posts: 526
Garage
Looking at the pictures on his web site, you would need install a cap screw in one of the two bolt holes in the end of the cam shaft. You need to select the cam bolt hole that will indicate the closest to when cylinder#1 is coming up on TDC. Hopefully that will be 120* to 30* BTDC. I would place the engine at TDC for cylinder# 1 and see which bolt hole will work best in relation to where the sensor will be. The cam bolt head must pass the sensor head prior to the cylinder coming up on TDC. Remember to determine which direction the cam rotates when you rotate the engine. Also, the sensor mounting plate can be rotated(installed) in three different locations to accommodate locating the sensor head in relationship to the bolt head in the cam.
__________________
-Dennis
1977 930 Slant, MS3 EFI, Carrera intake, Twin plug, Powerhaus headers, Magnaflow muffler, Garretson intercooler, GTX3071R
Old 04-18-2020, 09:50 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #2 (permalink)
Registered
 
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
Yeh, Dennis has set you right; pick a hole, install the set screw, set the gap, good-to-go. You could also try looking at Clewett's instructions for his scav pump/cam sensor: https://www.clewett.com/instrux/TURBO_PUMP-INST.pdf

As far as the sensor is concerned, they're pretty simple. Either a Hall Effect (3 wire: power, ground, signal), or a mag sensor (2 wire: ground and signal, doesn't matter which is wired where). Wire appropriately, choose the correct type in ECU Manager.

For a magnetic sensor, look at the signals in the built in oscilloscope/capture in ECU manager when cranking, choose the noise floor (~50% of peak) correctly to reject unwanted noise.. The output of a magnetic sensor will vary wildly depending on gap/speed.

It'll probably start fine with the Motec default, but getting it spot-on correct can make it sync up faster - mine was reading 2.2V peak-to-peak, and the noise floor was letting garbage count when cranking. Setting it to ignore anything below 0.5V (1.1V peak) worked a lot better for me; 2 revolutions and it fires. I think the default was 0.25V or something like that - probably to let it work for guys with a slightly bigger installed air gap.
__________________
'77 S with '78 930 power and a few other things.
Old 04-18-2020, 10:36 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #3 (permalink)
Turbonut
 
Raceboy's Avatar
 
Join Date: Jun 2009
Location: Estonia, Europe
Posts: 1,261
Garage
Polarity matters with magnetic (VR) sensor!!! If polarity is wrong then pulse edge from which ECU triggers is also wrong (floats with RPM, the higher the RPM the more it is retarded). And some ECU's don't even detect signal from VR sensor that is connected with reversed polarity.
__________________
'83 924 (2.6 16v Turbo, 530hp),'67 911 hot-rod /2.4S, '78 924 Carrera GT project (2.0 turbo 340 hp), '84 928 S 4.7 Euro (VEMS PnP, 332 HP), '90 944 S2 Cabriolet
http://www.facebook.com/vemsporsche
Old 04-18-2020, 11:01 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #4 (permalink)
Registered
 
Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 4,184
Quote:
Originally Posted by Raceboy View Post
Polarity matters with magnetic (VR) sensor!!! If polarity is wrong then pulse edge from which ECU triggers is also wrong (floats with RPM, the higher the RPM the more it is retarded). And some ECU's don't even detect signal from VR sensor that is connected with reversed polarity.
Raceboy, he's using a Motec. Which can be set to trigger either way - so he could wire it however he wants. The coil doesn't care. The only thing that matters about choosing is to connect the shield to whatever wire he uses for signal ground.

I do personally tend to wire pins in accordance with the device pinout - but he can do it either way and it'll work.

Quote:
The sensor may be wired for either a rising or falling waveform by reversing the wires. The ECU should be setup accordingly. The tooth material must be magnetically soft, such as mild steel (do not use stainless steel).
https://www.motec.com.au/ac-sn-crankcamspeed/sn-crankcamspeed-ms/
__________________
'77 S with '78 930 power and a few other things.
Old 04-18-2020, 03:00 PM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #5 (permalink)
Turbonut
 
Raceboy's Avatar
 
Join Date: Jun 2009
Location: Estonia, Europe
Posts: 1,261
Garage
If ECU allows to switch polarity in software then yes.

__________________
'83 924 (2.6 16v Turbo, 530hp),'67 911 hot-rod /2.4S, '78 924 Carrera GT project (2.0 turbo 340 hp), '84 928 S 4.7 Euro (VEMS PnP, 332 HP), '90 944 S2 Cabriolet
http://www.facebook.com/vemsporsche
Old 04-19-2020, 09:24 AM
  Pelican Parts Catalog | Tech Articles | Promos & Specials    Reply With Quote #6 (permalink)
 
Reply


 


All times are GMT -8. The time now is 11:39 AM.


 
Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2025, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0
Copyright 2025 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.