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DIY R134a Conversion - 83 928S

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Old 02-27-2018, 11:08 AM
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Weissach
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Are you upgrading the condenser too?
Old 02-27-2018, 01:58 PM
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240Z TwinTurbo
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Originally Posted by Weissach
Are you upgrading the condenser too?
Nope
Old 02-27-2018, 07:53 PM
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Why not?
Old 02-27-2018, 09:29 PM
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SeanR
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Originally Posted by j.kenzie@sbcglobal.net
Why not?
Why?
Old 02-27-2018, 09:38 PM
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Just that the title said conversion of the system. The condenser is a part that might bear upgrading. If all's good, then no problem, but running R134 sometimes needs a little help.
Good luck,
Dave
Old 02-27-2018, 11:30 PM
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skpyle
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What are you supposed to upgrade the condenser to? My limited searching has found nothing that is a direct drop in for a 928.
Old 02-27-2018, 11:31 PM
  #22  
240Z TwinTurbo
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Originally Posted by j.kenzie@sbcglobal.net
Just that the title said conversion of the system. The condenser is a part that might bear upgrading. If all's good, then no problem, but running R134 sometimes needs a little help.
Good luck,
Dave
Title says "DIY R134a Conversion" so if I don't need to do it to run R134a then I'm not spending they money. The car ran R134a all of last summer and was very cold so the condenser efficiency for Charlotte, NC is not an issue.
Old 02-27-2018, 11:45 PM
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240Z TwinTurbo
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The R134a project took a little detour as the brakes needed some attention. The brake reservoir had dropped fluid level triggering the brake warning so upon inspection I see the DS front brake line is leaking. Since I have some new friends at the hydraulic shop I had them make me some new ones. I could have done them in standard rubber for ~$20/line, but I chose the black coated stainless steel lines with fancy colored ends. $115 later and I had 4 new brake lines and a chance to test out the new PowerBleeder by Motive. I ended up taking off the plastic spiral protector from the old hose and winding it onto the new one.



I should have the new barrier hoses installed tomorrow and hopefully the manifold gauge set I ordered will arrive as well. I plan to pressurize the system to 250psi using one of my welding bottles to test for leaks. I also need to take a trip to Harbor Freight to pick up a new vacuum pump.
Old 02-28-2018, 01:22 AM
  #24  
The Forgotten On
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Originally Posted by skpyle
What are you supposed to upgrade the condenser to? My limited searching has found nothing that is a direct drop in for a 928.
There is this one that Griffiths is offering https://griffiths.com/product/928573...years-1978-86/
Old 02-28-2018, 01:43 AM
  #25  
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I'll be damned, look at that...
Thanks!
Old 02-28-2018, 04:48 AM
  #26  
murray928
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This one on ebay uk is great value @ £120 even with postage etc to the USA

https://www.ebay.co.uk/itm/Porsche-9...QAAOSwA3dYelRq

Old 02-28-2018, 08:45 AM
  #27  
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Originally Posted by 240Z TwinTurbo
Title says "DIY R134a Conversion" so if I don't need to do it to run R134a then I'm not spending they money. The car ran R134a all of last summer and was very cold so the condenser efficiency for Charlotte, NC is not an issue.
I thought you were running R12, because you said conversion. If you're happy with what you've got, you probably don't need a better PF condenser.
Good luck,
Dave
Old 02-28-2018, 11:47 AM
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240Z TwinTurbo
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Originally Posted by j.kenzie@sbcglobal.net
I thought you were running R12, because you said conversion. If you're happy with what you've got, you probably don't need a better PF condenser.
Good luck,
Dave
Conversion as in, what needs to be changed to run R134a. My local mechanic charged the system last year by adding R134a to my R12 system. Compressor leaked out all the freon from the manifold o-ring so I am converting the necessary parts to run R134a.
Old 02-28-2018, 12:20 PM
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Originally Posted by 240Z TwinTurbo
Conversion as in, what needs to be changed to run R134a. My local mechanic charged the system last year by adding R134a to my R12 system. Compressor leaked out all the freon from the manifold o-ring so I am converting the necessary parts to run R134a.
Great.
Old 03-07-2018, 04:32 PM
  #30  
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Everything is installed and ready to go so I hope to recharge the system no later than tomorrow. Finally received all the gear today to charge this myself.

Purchased the single stage pump from Harbor Freight and also purchased the 2-year warranty. Don't forget to use your 20% off Coupon! $119 out the door.




I took the advice from the reviews and purchased a good quality vacuum oil. $11.25




I also purchased a set of gauges from Amazon that got favorable reviews....$27! Make sure you purchase the adapter that converts the yellow line to the spout on the R134a tap.
$26.99 -
Orion Motor Tech 5FT AC Diagnostic Manifold Freon Gauge Set for R134A R12, R22, R502 Refrigerants, with Couplers and ACME Adapter Orion Motor Tech 5FT AC Diagnostic Manifold Freon Gauge Set for R134A R12, R22, R502 Refrigerants, with Couplers and ACME Adapter
$7.21 -
FJC 6015 R134A Refrigerant Tank Adapter FJC 6015 R134A Refrigerant Tank Adapter




Final step to test the pump for performance. As best I tell, with just about 15 seconds of pump time it sits at ~28 InHg.



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