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-   -   Rennaire procooler really drop vent temps by 20 degrees?? (http://forums.pelicanparts.com/porsche-911-technical-forum/221805-rennaire-procooler-really-drop-vent-temps-20-degrees.html)

scottb 05-17-2005 08:19 AM

I bought an aftermarket condenser from www.iceac.com. Here's a picture in the front left fender, without the rock guard I fashioned:

http://forums.pelicanparts.com/uploa...1116346717.jpg

I straightened out the bent fins before I buttoned everything up.

Jared at Pelican Parts 05-17-2005 08:26 AM

Ok, im thinking now of simply mounting the 993 condensor in the front wheel well, along with the stock front condensor, eliminating the rear condensor, new lines and a sanden 507.

bigchillcar 05-17-2005 08:58 AM

Quote:

I think Jim Sims (our resident a/c guru) posted something on how to tell whether you have barrier hoses. The bottom line is that you should not waste your time working on the a/c without either (a) knowing the hoses are barrier, or (b) installing barrier hoses yourself.
thanks, scott..agreed..i want barrier hoses as long as i keep using r-12 (liquid gold).

Quote:

adding little fans to the rear condenser seems to be "a pea in the ocean."
Quote:

I beg to differ with Scottb on the fan, when used in conjunction with an additional condenser it does provide some support during stop and go traffic.
i read hadlun's thread regarding his rear condenser electric fan..read like the purpose was soley for stop and go traffic..i imagine it would be superfluous at speed..it would be nice to see before and after temp results sitting at idle though..

Quote:

I could test the effectiveness of the fan by disconnecting it and checking pressures and temps though that might be way too scientific. Also if it turns out the fan makes no contribution I might feel the A/C is less effective. Remember its all about perception.
yeah, i'd like to see these result at idle (be sure to wear a geeky lab coat)..and i like the idea of 'perceived cold'..i'm thinking maybe skip the car mods and just go the hypnosis route..'i'm not melting..i'm not melting..it's snowing inside..snowing inside..' ;)
ryan

jdowty3 05-17-2005 08:58 AM

The 964\993 style is much more efficient and incorporates a fan and shroud to maxamize air flow. The 911 AC problem is mostly heat transfer from the condensor becasue of poor air flow and is compensated by adding more condensor surface area. The 993 has great AC and does not need multiple condensors.
Make sure the condensor setup you buy has the bracket, shroud and fan included. Additional custom mounting brackets have to be fab'd to do the install and does require removal\relocation of the washer resevoir and the gas tank expasion chamber.

bigchillcar 05-17-2005 09:01 AM

Quote:

The 964\993 style is much more efficient and incorporates a fan and shroud to maxamize air flow.
what's unique in the design of the 993 compressor over any other wheelwell compressor with fan available? does your testimony state (for the record here..lol) that this condensor alone is sufficient and that you may remove all others?
ryan

scottb 05-17-2005 10:12 AM

Quote:

Originally posted by Jared Fenton
Ok, im thinking now of simply mounting the 993 condensor in the front wheel well, along with the stock front condensor, eliminating the rear condensor, new lines and a sanden 507.
I can't fathom why you'd remove one condenser, and then add one. It makes no sense. Why not just leave the rear condenser and then add the front condenser in the fender?

More condenser surface = more cooling.

Jared at Pelican Parts 05-17-2005 10:15 AM

More air into the engine comaprtment for better cooling

nostatic 05-17-2005 10:19 AM

rip out the ac and move to alaska. that should lower your vent temperatures...

scottb 05-17-2005 10:20 AM

Quote:

Originally posted by Jared Fenton
More air into the engine comaprtment for better cooling
Let me see if I have this correct: The whole bottom of the engine bay is open, and there's a grill on the rear deck that's maybe three square feet. And you think that by removing the condenser, through which air flows, albeit restricted somewhat, you'll be getting extra noticeable cooling? I'm not a cooling expert, but I'd be VERY suprised if removing the condenser is going to get you much improvement, if any.

My $.02, but I'd be interested to hear what others think.

scottb 05-17-2005 10:21 AM

Quote:

Originally posted by nostatic
rip out the ac and move to alaska. that should lower your vent temperatures...
And your engine temps!

Jared at Pelican Parts 05-17-2005 10:24 AM

My engine did run slightly cooler (according to the oil temp gauge) by removing the non-used condensor

scottb 05-17-2005 10:26 AM

Quote:

Originally posted by Jared Fenton
My engine did run slightly cooler (according to the oil temp gauge) by removing the non-used condensor
What's more important to you? A "slightly" cooler engine, or a much cooler cabin? If it's the cooler engine, then remove the condenser.

Jared at Pelican Parts 05-17-2005 10:37 AM

Hey, im just exploring options here..

vash 05-17-2005 10:48 AM

with the air conditioner on, how much heat is coming off that rear condensor? maybe enough to warm the air a bit?

i took the AC out of a 75 car, and i noticed temps lower at the gauge too. i cant explain it, tho. maybe the increase of the opening in the lid?

911nut 05-17-2005 10:51 AM

Quote:

Originally posted by Jared Fenton
I have no desire to put a condensor under my car... I probably cant afford it anyway....

Why not? It would let you get rid of the engine lid condenser like you want to do. The belly condenser is so strong that you jack the car up on it and do no damage. I think it cost $400 so it's not real expensive. If you are using R134a it's the way to go.

If you use an 993 condenser it's going to take a lot of work to make brackets and relocate the stuff in the left hand wheelwell.

jdowty3 05-17-2005 10:55 AM

The rear condensor gets almost too hot to touch when the AC is running on a hot day. The in and out connectors will easily burn bare skin. Removing it will definately give the engine much cooler air.

Mysterytrain 05-17-2005 11:22 AM

The rear lid condenser is dumping heat on the engine and in return raising engine temps..not a major issue when you are moving but when stopped in traffic the engine fan just is not pulling alot of air. The under belly condenser will supply more surface area ( a good thing) but..in stop and go traffic you have the same problems..reduced air flow and that heat is now coming up thru the floor..again not an issue when you are moving. The dream has always been to remove the rear lid condenser and go with something under the drivers side fenders like griffith or the 964. I've done lots of homework on this approach and most of the threads that have been started regarding this type of modification have no follow-ups as to how the project turned out. I have often wondered if the 964/ 993 condenser assembly would fit in the rear fender like griffiths...making it possible to run two units if needed? Performance Aire also makes a new improved three layer rear condenser that looks interesting unfortunately I haven't heard much about the operation of that unit. I like the looks of the new retro air evaporator seems like a good way to go. Another strange A/C issue that has always puzzled me and is never addressed here is the return air plumbing. On the passenger side it is behind the floor board and flow is really effected by carpeting. The Drivers side is more of a joke..you have that big ol' 3.5" or so duct from the evaporator that goes to an opening behind the gas pedal..then you throw some carpet on that and reduce the opning even more. I've often wondered why they didn't use the center tunnel to pull air from vents that could have been located under the seats. Anyway..how about you A/C pioneers reporting back to us all on your systems, the components and what works and what doesn't.

Jack Olsen 05-17-2005 12:09 PM

The more condenser area the better.

I always kind of roll my eyes at the Procooler. Maybe it works. It's not clear to me why it would do all that much, and the manufacturer has never had it tested, as far as I can tell. But I'm not an AC expert by any stretch, just a consumer -- and I doubt it hurts a system's performance. But I don't know if the expense is justified.

More condenser area is definitely going to help. A good compressor is definitely going to help. Getting all the basic components, like the hoses and evaporator, up to snuff is definitely going to help. A lot of times, all of this is done when the Procooler is added, and I think its perceived benefit grows as a result.

scottb 05-17-2005 12:13 PM

Quote:

Originally posted by Jack Olsen
A lot of times, all of this is done when the Procooler is added, and I think its perceived benefit grows as a result.
Very astute observation. I added my PC when I added the front fender condenser and installed barrier hoses. Did the PC give me the mid-30s vent temps that I'm getting now? Doubtful, but I'm sure it didn't hurt (as Jack said).

Jared at Pelican Parts 05-17-2005 12:17 PM

$400 for the underbelly seems good, You can really jack the car up with it?


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