S4 and Greater Fan Control Module - Page 5 - Rennlist - Porsche Discussion Forums



928 Forum
Sponsored by: 928 Specialists

S4 and Greater Fan Control Module

Reply
 
Thread Tools Search this Thread
Old 09-04-2012, 06:22 PM   #61
danglerb
Super User
 
danglerb's Avatar
 
Join Date: Oct 2006
Location: Orange, Cal
Posts: 8,482
Default

What is the input to the S4 fan controller like, logic from a brain, or analog from a sensor?
danglerb is offline   Reply With Quote
Old 09-05-2012, 12:01 AM   #62
dr bob
Chronic Tool Dropper
Lifetime Rennlist
Member
 
dr bob's Avatar
 
Join Date: Oct 2001
Location: Bend, Oregon
Posts: 15,612
Default

There's a separate 'smart box' that reads the radiator temp sensor, the freon pressure, AT fluid temp, AC run status, engine run status, the hood switch, and the intake manifold switch. It outputs discrete step signals to the front flap controller, and something to the final stages module to tell it target fan speeds. I don't have the WSM handy with the test procedure. But the final stages module in front does not read analog or discrete sensors/switches directly.
dr bob is offline   Reply With Quote
Old 09-05-2012, 07:43 AM   #63
Mark Anderson

Rennlist
Site Sponsor

 
Mark Anderson's Avatar
 
Join Date: Nov 2002
Location: Anaheim Ca
Posts: 5,431
Default

Quote:
Originally Posted by rgs944 View Post
If we are looking at 20 to make it cost effective I wonder if we could find 10 pre-orders and find a vendor to take on the other 10 for future sales.
I'm up for 10
__________________
Mark Anderson
928 International
Mark Anderson is online now   Reply With Quote
Old 09-05-2012, 10:30 AM   #64
fraggle
Addict
Rennlist Member
 
fraggle's Avatar
 
Join Date: May 2003
Location: Bristow, VA
Posts: 3,376
Default

The smart box that Dr Bob is referring to is located next to the passenger seat in the same enclosure as the radio amp.
fraggle is offline   Reply With Quote
Old 09-05-2012, 07:25 PM   #65
yardpro
Addict
Rennlist Member
 
yardpro's Avatar
 
Join Date: Dec 2010
Location: Morehead City NC
Posts: 1,777
Default

depending on cost i would be up for one as well...

i have been putting off my hvac R&R... i need to get my but on the stick
yardpro is offline   Reply With Quote
Old 09-08-2012, 10:43 PM   #66
LeRox
User
 
LeRox's Avatar
 
Join Date: Jun 2007
Location: Raleighwood
Posts: 553
Default

This is wonderful news and when can we expect working examples to be distributed. I have a rebuild scheduled and may put it off until next spring....
LeRox is offline   Reply With Quote
Old 09-09-2012, 07:12 PM   #67
jleidel
Almost Deleted
Rennlist Member
Thread Starter
 
jleidel's Avatar
 
Join Date: Aug 2008
Location: McKinney, TX
Posts: 4,001
Default

Dr. Bob, thanks for getting those measurements. Apologies all for the few days of silence. Our lab crew has been chasing down some circuit tuning wackiness on our forthcoming product line. [for those with EE backgrounds, debugging a 24-layer board with high speed serial links can be challenging]

At any rate, I'll get these values into the model and we'll nail down a final circuit schematic. The initial parts list doesn't look hairy at all. I have a good idea what sort of volume we're dealing with now. As soon as I have a reasonable idea of what the board fab will require, I'll try to post some rough cost estimates with a few options.

Thanks again all.
jleidel is offline   Reply With Quote
Old 09-25-2012, 11:11 AM   #68
ALKada
Addict
Rennlist Member
 
ALKada's Avatar
 
Join Date: Apr 2010
Posts: 3,499
Default

John,
Any updates? I know you were in the process of moving recently.

Last edited by ALKada; 09-25-2012 at 01:53 PM.
ALKada is offline   Reply With Quote
Old 09-25-2012, 11:29 AM   #69
dprantl
Super User
 
dprantl's Avatar
 
Join Date: Dec 2003
Location: Atlanta, GA
Posts: 4,392
Default

How did I miss this thread until now... would it be possible to add the ability to change the engine temperature vs. fan speed ramp with this new controller? Earlier cars can just put in a lower temp fan switch, but newer cars cannot do this.

Dan
'91 928GT S/C 475hp/460lb.ft
dprantl is offline   Reply With Quote
Old 09-25-2012, 12:08 PM   #70
Lorenfb
Super User
 
Lorenfb's Avatar
 
Join Date: May 2003
Location: Manhattan Beach, CA
Posts: 3,212
Default

"Depends... modern FETs are much more resistant to heat and normal wear/tear. To that end we may use similar, but much more modern FETs."

Hardly the issue! The problem is NOT with MOSFETs in the original design, it's the design
itself that's the problem.

"I'll get these values into the model and we'll nail down a final circuit schematic."

A replacement unit without an analysis of the original unit and whether there's
a simple solution????

Read here for more info: https://rennlist.com/forums/928-foru...ive-fixed.html

Last edited by Lorenfb; 09-25-2012 at 12:54 PM.
Lorenfb is offline   Reply With Quote
Old 09-25-2012, 01:50 PM   #71
dr bob
Chronic Tool Dropper
Lifetime Rennlist
Member
 
dr bob's Avatar
 
Join Date: Oct 2001
Location: Bend, Oregon
Posts: 15,612
Default

Quote:
Originally Posted by dprantl View Post
How did I miss this thread until now... would it be possible to add the ability to change the engine temperature vs. fan speed ramp with this new controller? Earlier cars can just put in a lower temp fan switch, but newer cars cannot do this.

Dan
'91 928GT S/C 475hp/460lb.ft
Dan--

You can dink with the controller response easily by adding a resistor in parallel with the sensor input to the fan controller. Pretty easy mod, done at the controller connector under the cover by the passenger seat. This isn't something I publish, because owners would end up with fans running all the time, masking other cooling system deficiencies until the fan motors give up. Owners look for a low and rock-steady gauge reading, which requires a great radiator and a low-hysteresis thermostat, along with fans running way too much.
dr bob is offline   Reply With Quote
Old 09-25-2012, 01:58 PM   #72
dprantl
Super User
 
dprantl's Avatar
 
Join Date: Dec 2003
Location: Atlanta, GA
Posts: 4,392
Default

Sure, you can fool it with a resistor in series, but it would be pretty nice to have something built-in as long as it wouldn't raise the price/complexity much.

Dan
'91 928GT S/C 475hp/460lb.ft
dprantl is offline   Reply With Quote
Old 09-25-2012, 03:19 PM   #73
danglerb
Super User
 
danglerb's Avatar
 
Join Date: Oct 2006
Location: Orange, Cal
Posts: 8,482
Default

Quote:
Originally Posted by dprantl View Post
Sure, you can fool it with a resistor in series, but it would be pretty nice to have something built-in as long as it wouldn't raise the price/complexity much.

Dan
'91 928GT S/C 475hp/460lb.ft
That is kind of the trick, improve on stock reliability and cost while adding a feature.
danglerb is offline   Reply With Quote
Old 09-25-2012, 03:38 PM   #74
fraggle
Addict
Rennlist Member
 
fraggle's Avatar
 
Join Date: May 2003
Location: Bristow, VA
Posts: 3,376
Default

I'm going to add some sort of sensor bypass to my "box" so I can kick the fans on full bore when I know I'm going to be stuck in traffic for awhile - before I end up with heat soak of any kind. It happens a lot here in VA with crummy traffic and high, humid temps at the peak of summer.

That said, I'm also going to put in a TC somewhere with a digital readout so the gauges don't fool me.
fraggle is offline   Reply With Quote
Old 09-25-2012, 04:54 PM   #75
dr bob
Chronic Tool Dropper
Lifetime Rennlist
Member
 
dr bob's Avatar
 
Join Date: Oct 2001
Location: Bend, Oregon
Posts: 15,612
Default

Quote:
Originally Posted by fraggle View Post
I'm going to add some sort of sensor bypass to my "box" so I can kick the fans on full bore when I know I'm going to be stuck in traffic for awhile - before I end up with heat soak of any kind. It happens a lot here in VA with crummy traffic and high, humid temps at the peak of summer.

That said, I'm also going to put in a TC somewhere with a digital readout so the gauges don't fool me.
If your AC is running, the fans are already at full speed.

The factory system is amazingly responsive to cooling requirements without a lot of owner 'fiddling'. That's why I choose not to share details on how to make the fans run earlier/cooler. Think about it-- There is really no real need or desire to add engine cooling at any time that the thermostat is less than full-open. The full-stroke range on the thermostat is somewhere in the 10║ to maybe 15║ range in my experience, so full-open happens somewhere around 200║F with the factory thermostat. The gauge will run higher in the summer than in the winter, maybe 15║ difference. It's very normal, definitely OK, engine certainly doesn't mind. It's why the temp-II sensor is allowed to detect water-bridge temps over 190║, hard to believe but true! It's a pee-sycho-logical issue with owner's and how they see the gauges. Get used to it, get over it, and invest your worries on something that's actually important.

[/old and crabby mode]
dr bob is offline   Reply With Quote
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Defeating the Bulb Control Module borland 928 Forum 47 09-12-2016 03:34 PM
AC Fan and Flap Control Circuit 996Fever 928 Forum 1 07-03-2016 10:55 AM
Generic OBDII Codes Part 1 & 2 (P0001 to P3493) jkw911 997 Forum 11 12-09-2015 01:37 PM
Controller for rear spoiler springer3 964 Forum 32 12-26-2014 12:57 PM
Any EE's want help teach me about circuit boards? mgianzero 993 Forum 16 01-13-2014 07:05 PM


Tags
2006, 928, b5, control, controller, design, fan, fans, forum, jumper, module, pin, pins, porsche, project, running, s4

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Forum Jump


All times are GMT -3. The time now is 11:38 PM.


Copyright ę 1998 - 2017 Rennlist.com
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: