If a 1987 930 is converted to R134 from R12 will the air be colder than if it was still using R12. I'm asking since I am looking at a 930 that will be converted to R134 and I need a decent AC in Texas. Also would the EFI tuning need tweaking to account for the AC now being used (currently isn't in the car)?

 

R134 will not cool as well as the R12 did. It operates at a higher pressure too and uses a different lubricant. It would be wise to add a high/low pressure cutoff switch to your system since the old system only has a low pressure switch. If you still have to old hoses you will lose refrigerant faster than the old system because of the higher pressure. I just threw in the towel and replaced everything with new stuff. I did it myself and it is onjly physically demanding not mental.

 

i have an 89 which was converted. However to do it right and to get cold air you have to replace all the hoses because the freon will pass through since they do not have internal barriers. I added a stonger blower motor and a vent above the console below the dash. it blows really cold. It is an expensive conversion I paid 2200. make sure your condense and evap are in good shape

 

My 2 cents. I have an '87 that I converted from R12. The system was submarginal (at best) on R12 and worse on R134. I live in central Ohio and the system, at best with new equipment and either freon is not acceptable. I've spent a lot of time in Texas and I would not want to live with any mid to late '80s Porsche air conditioning.

There are or were two vendors who advertise in Pano that have total replacement systems for our cars. I can't speak from experience, but others have said that their systems are much better. The cost may seem overwhelming, but if you live in a hot climate like Texas, I'd change.

There should be some people on this forum who can relate experiences with these systems. OK, I know anybody who is a purist shouldn't care about air conditioning and I also know that "back in the '50s nobody had air." However, some times we need to apease our spouses too. Did I buy one of these new systems? No. I just bought another late model Porsche with good air. She enjoys the GT3 and I continue to drive the '87 with submarginal air!

Agan, my 2 cents.

Dave

PS. I purchased some freon with the leak sealer instead of replacing the hoses. It works and I only have to add about one can of freon per season.