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Old 06-15-2017, 11:54 PM   #1
Gray Ghost GT
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Default MMR AC Eliminator: Capping the lines?

I'm installing the MMR AC Eliminator; removing the AC compressor and condenser to remove 65 lbs. of weight from the front end on my road course car. Has anyone else installed this part? What should I use to cap the lines to prevent moisture from entering the lines, etc.? Thanks
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Old 06-16-2017, 02:12 AM   #2
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The entire system charged isn't 35lbs.

Take everything out but the EVAP core.

Also I do believe I paid like $60 for my Ford Racing A/C delete from AM
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Old 06-16-2017, 08:21 AM   #3
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Originally Posted by RocketcarX View Post
The entire system charged isn't 35lbs.

Take everything out but the EVAP core.

Also I do believe I paid like $60 for my Ford Racing A/C delete from AM
Good to know. Only 35 lbs.... was it worth the effort? Did you feel a difference in the turns/esses at speed (reduced under steer?). Hoping for a 45+ lbs. difference.
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Old 06-16-2017, 08:36 AM   #4
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You're not going to prevent moisture getting in those lines, period. There's a reason you have to pull an AC system down to a hard vacuum before putting refrigerant in; it's to get all the moisture out.

My point is that if you're going to eliminate the AC system, get rid of all of it, including the lines.

Also, I'm not sure how high of a level you are, but I wouldn't be able to notice a 35-pound weight difference. Now, if I'm converting a car to a full-on race car (no longer street legal), then heck yeah I'm going to ditch the AC (and a bunch of other stuff). But if you still drive your car on the street, I'd leave the AC in.
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Old 06-16-2017, 08:56 AM   #5
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I could feel a 35 lbs. difference in the front end based on my experience, etc. but I plan to keep the car street legal so I'm leaning against this particular mod. Appreciate everyones feedback. Thanks.
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Old 06-16-2017, 10:56 AM   #6
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Quote:
Originally Posted by Sky Render View Post
You're not going to prevent moisture getting in those lines, period. There's a reason you have to pull an AC system down to a hard vacuum before putting refrigerant in; it's to get all the moisture out.

My point is that if you're going to eliminate the AC system, get rid of all of it, including the lines.

Also, I'm not sure how high of a level you are, but I wouldn't be able to notice a 35-pound weight difference. Now, if I'm converting a car to a full-on race car (no longer street legal), then heck yeah I'm going to ditch the AC (and a bunch of other stuff). But if you still drive your car on the street, I'd leave the AC in.
On a car with a functional suspension at the drag strip every 100 pounds is supposedly equivalent to .10 I am sure there has to be some performance gain for weight with road racing.
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Old 06-16-2017, 02:16 PM   #7
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On a car with a functional suspension at the drag strip every 100 pounds is supposedly equivalent to .10 I am sure there has to be some performance gain for weight with road racing.
Yes, definitely. But in my opinion, saving 35 pounds and no longer having AC on a street car is not worth the relatively small performance gain.
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Old 06-17-2017, 01:03 PM   #8
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I still have A/C in my street-driven TT car, and I have no interest in removing it. I haven't noticed any difference in how the car feels when changing ballast (~30 lb) or fuel load, but it does make a small difference in lap times. The only time I can really notice a difference is with a passenger, but that's significantly more weight than what you're looking at removing.

While your car will be very slightly faster and stay a little cooler without A/C, you will miss it on the street on a hot day. I think the largest benefit is using it to defog the windows when it's humid.

If you're competing in a class in which you're fighting for 0.1-0.2 seconds per lap, then I would certainly ditch the A/C if you trailer the car (which would be very likely in that situation). Otherwise, there are many other ways to make the car faster. If you're just doing non-competitive HPDE or track day events, then I really don't think it's worth it.
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Old 06-18-2017, 01:25 AM   #9
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Good to know. Only 35 lbs.... was it worth the effort? Did you feel a difference in the turns/esses at speed (reduced under steer?). Hoping for a 45+ lbs. difference.
My car is drag oriented, I can't say I felt the difference enough to care. With all of the other weight reduction my car has seen it's not a big deal.
I put it back in a few weeks ago, this summer is going to be way too hot to not have it and for any kind of daily use in the rain it's a must. The foggy windows can get scary in a hurry.
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