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Hybrid system BMW/Chevrolet

James39 on Mon March 12, 2012 9:43 AM User is offline

Year: 1999
Make: BMW
Model: 540i
Engine Size: 6.0
Refrigerant Type: r134a
Country of Origin: United States

I swapped a GM LS engine (LQ4/t56) into my 1999 BMW 540i

I am in need of a compressor that will work well with the existing BMW AC components (receiver/dryer, evaporator)

I already installed a C6 Corvette Condenser in the car, and I plan to use the GM ECM to control the AC compressor operation. I think it uses a switch of some type in the line to read pressure to control operation.

I'll need to use the 6-groove pulley on the crank to drive the compressor. There just isn't enough room to use the dedicated 4-rib side of the crank pulley.


So, basically, I need a good compressor to work with this system, as well as any good recommendations for making the custom hoses to tie everything together, along with a way to install the pressure switch needed by the GM ECM.

Thanks!

mk378 on Mon March 12, 2012 10:23 AM User is offline

I thought the Corvette used a V7 compressor. That is one of GM's best compressors, it also has internal pressure control so it is simple to control. It can just spin constantly all the time the A/C is on.

James39 on Mon March 12, 2012 3:12 PM User is offline

I have a brand new GM C6 Corvette compressor in my garage. The problem is that it has a 4-rib pulley, and won't clear my engine mounts and headers.

If I could put a 6-rib pulley on it, I would, but I can't find any information about compatibility between V7 and the C6 compressor pulleys. Might be best to try to find a used 6-rib V7 pulley and see if it will fit?



bohica2xo on Thu March 15, 2012 11:15 PM User is offline

You can buy a V7 with a six rib clutch:

V7 Compressor with 6 rib clutch & ear mounts

Or the site sponsor can get you a clutch assembly with the 6 rib drive. Call the guys @ AMA 602-233-0090 They can get the parts.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

James39 on Fri March 16, 2012 1:29 PM User is offline

I think I figured out that the C6 vette is a CVC type compressor, and it shares the same design as some other Buick and Chevy cars with the 5.3 engine.

They came with a 6-rib AC compressor, so I bought the clutch assembly for one of those cars. I'm hoping it will bolt right on. I'm not so sure yet how I'll get it mounted, but I think I have the compressor side figured out.

Still not sure on the best route to take for making lines. Is there an economical way to make lines as a DIY? Or am I going to have to resort to having them made?

If I figure out the lengths can ACkits.com do it for me?







Edited: Fri March 16, 2012 at 1:31 PM by James39

bohica2xo on Sat March 17, 2012 2:43 PM User is offline


I have no idea what year a C6 corvette is, to me a "C6" is a ford transmission. A 2004 Corvette used a V7 compressor, with a 4 rib pulley. Apparently your donor car was later than that if it has the CVC185 compressor. The CVC is a good unit, also variable displacement. You should be ably to replace it with the ear mount V7 if mounting is easier. The computer only sees the clutch, it will not know the difference.

Hoses.
You will be making custom parts. The mating pieces to attach to the BMW & GM parts are all available from AMA. The best way to get a quality fit, is to mock up the system in the car with the proper hose & fittings. Once you get the hose lengths fitted the way you want everything, use a paint stripe at each fitting for clocking before you pull the hoses & fittings back out of the car.

With the hoses & fittings out of the car you can get them crimped. Some hose shops have the correct crimp dies, or you can send the un-crimped hoses back to Tim @ AMA for crimping. The A/C hose crimp is not the same as a hydraulic hose crimp - don't let anybody tell you it is all the same.

B.

-------------------------
"Among the many misdeeds of the British rule in India, history will look upon the act of depriving a whole nation of arms, as the blackest."
~ Mahatma Gandhi, Gandhi, An Autobiography, M. K. Gandhi, page 446.

James39 on Wed March 21, 2012 8:06 AM User is offline

Got the pulley today, works good!


Good action plan on the lines, probably what I'll end up doing. Thanks!

James39 on Thu June 20, 2013 7:48 AM User is offline

Finally have working AC!!!!

The ac seems cold, but the high side dips way down to like 100-120 PSI while driving. At idle it will cycle depending on the fan operation from like 150-220 PSI temps are in the low-mid 70s with high humidity.

How do these numbers sound?

What should be done to fine-tune a custom system like this?


Thanks

Edited: Thu June 20, 2013 at 7:49 AM by James39

mk378 on Thu June 20, 2013 10:03 AM User is offline

Numbers sound good so far. Get a good vent temp reading, using a physical thermometer not an IR gun.

You need hotter weather than 70's for a good test. With the car sitting still, the high side is always going to go up and down based almost entirely on the fan trip points rather than anything else.

James39 on Thu June 20, 2013 3:30 PM User is offline

At what fan/recirc settings/ vehicle speed is best to check vent temps?

Everyone in the Northeast can thank me for low temps so far in June. Only supposed to be 80 tomorrow! --



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