Some answers and comments on GT3R's questions;

More condenser area means more heat rejection so the front cooler might help in a hot and humid climate. My 78 doesn't have room for a front condenser and they're just so dam vulnerable up there. If yours is already in place I'd probably leave it.

I'm not expert enough to answer your question on refrigerant liquid temperature but I'd guess most of the cooling is from latent heat in vaporization so fluid temperature would not be that important.

My fan blows out of the engine compartment and this doubles the effective flow through the condenser. There have been previous debates on this website as to whether the a/c system heats air going into the engine compartment; I'd think the compressor load on the engine is more significant. One problem I had when I did my system I got the wrong crankshaft pulley which cut engine fan speed and that made a noticeable difference in engine temperature. If you need a/c put it in and then you may need to look at some added oil cooling.

Any results yet GT3R?
 

I'm interested in the same kind of DIY upgrade.

I had to replace my fan belt so, I just took off the four bolts holding the compressor to the mounting stand, took off the belt, replaced the fan belt and then rebolted the compressor back in place. Seems a lot easier than taking off the whole thing.

Hi Eric,
Nothing yet, I picked up the drier last week and I'm going to order the fittings and hose this week. I'm trying to secure a bubble crimper and a vacuum pump. I've read a couple of posts on R-12 replacements such as Duracool, Enviro-Safe, Freeze-12 and I'm trying to decide which to use. I'll post some pics and results once I've got the system running again. BTW I see you drive a Hornet, any relation to Bill Purdy who used to work at Miami Center?

Thanks for the info. Sorry, no relation that I'm aware of.
Eric

procooler/ac upgrades
 

thanks guys for all of the talk about the procooler

check out the following link
www.pca.org/mav/ feb 2004 edition
new cool for older porsches

and read and article from bill middleton a 930 owner and ac engineer. the article tells about his step by step process of improving his ac and why things will or won't work.

of course he has some nice things to say about the procooler, such as 50% of efficiency to his improved system was provided by the procooler.

thanks again

ron maxwell
procooler inventor
restoring 1970 911st serial # 02