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You are the one coming out with unsupported anecdotal comments with seemingly nothing other than fresh air to support your statements regarding your unsubstantiated PWM unit failure situation. On the other hand I have been appraised by two of the three owners of the companies who I have known for many years and who I trust implicitly and not once has any specific owner voiced complaint at their services and they have always reported success.
That you have ultilised this platform to express your views on this forum is what it is but has anyone seen anything from you to support your position? If your company has something to offer 928 owners all well and good- you would be more tha welcomed. To date I have never heard of any 928 owner speak up for your services or your company but then maybe I have missed something.
Sounds to me as though there is a credibility issue here that you might do well to work on. Might help develop some credibility if you were to advise what 928 kit you have actually worked on for 928 Rennlist owners who can vouch for your services..
You're aware of what's been posted by me to help diagnose 928 fan amplifier system problems over the last year, and solve other Porsche problems over the 19 years on Rennlist.
Please do a search, you'll find many.
Again with regard to the fan amplifier, remember it's an electronic part and not a mechanical part that typically fails with age!
The age of a fan amplifier is NOT a contributor to its failure rate as some believe!
__________________
Loren
Systems Consulting - Automotive Electronics
Specializing in Porsche cars http://www.systemsc.com/
Starts one fan at a time to reduce the startup load, easy to configure, works with a sensor installed in the bung in the stock radiator, very reliable, two dedicated standard relays that are easily replaceable.
I'm using it with Spal fans installed in a shroud made by Hans, but you could use it with any fans, including the OEM fans.
Starts one fan at a time to reduce the startup load, easy to configure, works with a sensor installed in the bung in the stock radiator, very reliable, two dedicated standard relays that are easily replaceable.
I'm using it with Spal fans installed in a shroud made by Hans, but you could use it with any fans, including the OEM fans.
I like the Davies Craig kit- had a look at that some time ago.
I have used the SPAL 12 inch dual fan kit for some 15 years and with the stock control kit that will take some beating. However I am convinced that something is less than perfect as the fans seem to rattle a bit on low load. I suspect there may be some kind of compatability issue between the stock PWM module and the SPAL fans. Run the things full bore on direct load from the battery no issue and no signs of any bearing issues either.
There is a far more simple solution for a 2 stage fan setup. Many OE use this method to avoid the heat, complication and high cost of a PWM setup.
If you wire up the the fans in series they will both run on a low speed and move plenty of air over the entirety of the radiator. Then if you use a small bank of relays to switch the wiring to parallel they will both run at a high speed. This type of relay wiring can be accomplished with 3 ordinary relays. 2 single pole and 1 double pole but there is an easier way. I've done this on many cars and it never disappoints. This is super easy to field repair becasue these common 30amp relays are easy to find or can be jumped in a pinch. I use a 2 stage Porsche 944 temp sensor to drive each stage. If you use Porsche relays, a 944 temp sensor and OE fans then this could is the only all Porsche alternative setup.
Last edited by icsamerica; 09-02-2022 at 12:42 PM.
I don't know what brand this one that's in my supercharged 928 is (installed by 928MS) but it works great and is adjustable for the engagement temperature by the **** on top. I rewired it so the controller picks an SPDT relay and then the fans actually get powered from a more substantial jump post connection. Temp sensor probe just inserts into the radiator fins up near the top on that side. Have one pusher fan in the front and 2 puller fans at the rear that all kick on together. I set the temp **** to be just above where the temp is when driving down the highway so that the fans only run on a really hot day, when the car is in traffic, or when being pushed hard.
thank you for the feedback on the OE setup as well as the aftermarket alternatives - some good food for thought. I apologize for delayed response due to travel and also, more importantly, for contributing to a philosophical challenge due to my incorrect terminology. I, in fact, meant the "output final stage" 92861842100 PWM amp under the hood in front of the radiator support on the passenger side. To be sure, I checked under the access panel in the cabin and yes indeed the PLC controller is thankfully still there and intact. I do believe I will try for an OEM PWM amp because I am not at all happy with the Derale experience thus far - really am just wanting to enjoy this car as is, not improve it, lol. I think I will also do the thermostat at the same time. Do I need any thing other than the thermostat and the two seals, 99970163240 and 92810616300? As to the water pump, it does not appear to be the leak source at moment. The timing belt was done by a reputable shop in Anacortes, WA and the justification for not replacing the water pump at the time was that it was not leaking as confirmed by pressure and vacuum testing. Thoughts? A lot of work to go back in and prophylactically replace it, no? Pics of fan controller and amp. Red wire is me jumping Derale controller to the Pos jump post.
The water pumps don't always leak before they fail. I had a perfectly dry 81 Euro S with a non leaking and non noise making water pump that did many multi-hundred mile trips before selling it to the new owner. 3 weeks later the water pump seized, snapping the belt. If it has aged out on time or mileage, it should be replaced.
09-02-2022, 04:14 AM
