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-   -   Why you should backdate your heat on a 3.2 (http://forums.pelicanparts.com/porsche-911-technical-forum/220695-why-you-should-backdate-your-heat-3-2-a.html)

SCWDP911 07-20-2008 06:15 PM

wow, great thread! missed it before...

heiltrading 02-01-2010 07:49 AM

911 3.2 custom fiberglass heater tube
 
http://forums.pelicanparts.com/uploa...1265042900.jpg


picture of the two parts before i painted with trim black paint.



http://forums.pelicanparts.com/uploa...1265042934.jpg

just modified the original parts so the upgrade was freeeee!

johnermo 02-01-2010 08:52 AM

I subscribe as well!http://forums.pelicanparts.com/uploa...1265046707.jpg

rnln 02-01-2010 09:32 AM

From the tiny switch at the red levers, can you just connect them directly to the foot blowers, with a relay to get power from the ignition?

Quote:

Originally Posted by Rot 911 (Post 1908689)
Actually I have done a bit of work on this problem and finally came up with a solution. First I tried a ceramic resistor which failed in just a couple of days, you can read all about the installation here: Heat backdate and footwell blower

And the failure of it and my next idea here: Ceramic Reisistor Failure

I installed the aluminum housed resistor in the same place as the failed ceramic resistor. The first one I installed was a 50watt, 50 ohm resistor which didn't work very well. The footwell blowers would only come on for a minute or so and then go off.

http://www.action-electronics.com/grc/r50w.jpg

Then I read this article by Bill Gregory Bill Gregory Tech Article regarding the backdate of a 964 and he recommended a 51 ohm 15 watt resistor.

Then it got warm out so I haven't actually switched out the 50 watt resistor for a 15 watt. I have no reason to believe it will not work. Here is where I purchased my resistors: Resistors, 10 Watt Wire Wound Resistors


Rot 911 02-01-2010 10:00 AM

Quote:

Originally Posted by rnln (Post 5159317)
From the tiny switch at the red levers, can you just connect them directly to the foot blowers, with a relay to get power from the ignition?


The resistor idea did not work, however, thanks to the hard work of fellow Pelican, Mysterytrain, we found that a simple crossover of the reed switch solves the problem. Read through this thread for how to do it. http://forums.pelicanparts.com/porsche-911-technical-forum/258473-help-does-anyone-understand-footwell-blower-circuit.html

scarceller 02-01-2010 10:26 AM

Quote:

Originally Posted by Rot 911 (Post 5159365)
The resistor idea did not work, however, thanks to the hard work of fellow Pelican, Mysterytrain, we found that a simple crossover of the reed switch solves the problem. Read through this thread for how to do it. http://forums.pelicanparts.com/porsche-911-technical-forum/258473-help-does-anyone-understand-footwell-blower-circuit.html

This thread covers the circuit in great detail.
http://forums.pelicanparts.com/porsche-911-technical-forum/388445-carrera-removing-engine-compartment-heater-blower.html
I also included a modification to toss out the complicated stock relay box and replace it with 2 simple relays or (just one simple relay for backdate).

Thrasher 02-10-2010 11:46 AM

Thanks for all the great detailed information Sal, Ron and others.

I was just looking into backdating my heat and saw on Thom's site that he stopped taking orders for the Left side piece in 2006.

Where is everyone getting this piece now?

herr_oberst 02-10-2010 12:29 PM

subscribed

WIL84911 02-10-2010 12:37 PM

Quote:

Originally Posted by Thrasher (Post 5177903)
... Where is everyone getting this piece now?

I just saw a few sets being let go in the classifieds section not too long ago. Here's a post on someone looking for one.

http://forums.pelicanparts.com/porsche-911-used-parts-sale-wanted/520521-wanted-left-right-heater-ducts-duct.html

Rick Chip 02-10-2010 03:46 PM

Thrasher,

I purchased mine from our host.

pplkook 02-10-2010 03:51 PM

How much modification is required for the left side duct on a Carrera? It seems like the feedback on the parts is that you need to do some metal shaping with a hammer??

-Jack

Rick Chip 02-10-2010 04:02 PM

Jack,

The drivers side on my 85' Carrera pretty much bolted right up, I had more trouble with the passenger side.

James Brown 02-10-2010 04:16 PM

Why stop with the heat and go all the way backdating, before
http://forums.pelicanparts.com/uploa...1265850818.jpg
and after. Note the street elbow on the right side, cheap and easy.
http://forums.pelicanparts.com/uploa...1265850908.jpg
keep up the great work guys!!!

carreradpt 08-23-2011 06:32 PM

Reviving this thread as I am in the process of backdating my Carrera. What did you do with the blower power connector? And do you "shape" the left side duct near the dizzy while bolted on or should I remove it, ballpeen a bit and reinstall? It needs adjusting to get the dist cap on. What would you do?

john walker's workshop 08-23-2011 07:07 PM

ball peen jobs kinda look like that. cut out a nice curve, then weld a curved piece of 20ga sheet metal in, grind it out nice and paint.

carreradpt 08-24-2011 09:46 AM

Thanks John. You're right, that's what I will do. How about the electrical connector? Tape the connector end and Zip tie it to the ?

kidrock 11-21-2011 06:21 PM

I've been trying to locate this reproduction heater duct but having no luck. I don't wish to purchase a metal one and fab to fit around my distributor.

Does anybody know where I can find this now????

http://forums.pelicanparts.com/uploa...1321932078.jpg

jackb911 11-21-2011 06:41 PM

My backdate. The heater still works just fine.

http://forums.pelicanparts.com/uploa...1321933271.jpg

http://forums.pelicanparts.com/uploa...1321933282.jpg

efhughes3 11-21-2011 06:43 PM

I have a FG version that Thom used to sell here years ago. I ended up having to peen it to clear my 964 distributor, then reglassed the indentation.

Maybe a WTB post in FS would turn one up?

efhughes3 11-21-2011 06:49 PM

My mod:

http://forums.pelicanparts.com/uploa...1321933612.jpg
http://forums.pelicanparts.com/uploa...1321933629.jpg
http://forums.pelicanparts.com/uploa...1321933648.jpg

Finished version:


http://forums.pelicanparts.com/uploa...1321933754.jpg


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