Mach1 Modding

[C3]

Hi Guys,

Today I was able to grab a Mach1 very cheap ;) and I wanna use it for my upcoming X850XT,so I decided to install this eva - click here - (http://www.xtremesystems.org/forums/showthread.php?t=42639) .
So the system must be refilled anyway and I want to upgrade it to R404a.
Now my question,when I replace the capillarytube with a tev I have just to adjust the tev with it`s "poti" to the optimal settings,right?!
No other modding?!

Btw. how much R404a is in your Mach1/2 systems?

[Firefoxx]

Hi Guys,

Today I was able to grab a Mach1 very cheap ;) and I wanna use it for my upcoming X850XT,so I decided to install this eva - click here - (http://www.xtremesystems.org/forums/showthread.php?t=42639) .
So the system must be refilled anyway and I want to upgrade it to R404a.
Now my question,when I replace the capillarytube with a tev I have just to adjust the tev with it`s "poti" to the optimal settings,right?!
No other modding?!

Btw. how much R404a is in your Mach1/2 systems?

My Mach2 r404a got -67° 0W and I didn't change the capillary tube.

[C3]

But I think a tev would gain me another few degrees ;)
Would love to hear chilly1`s oppinion ;)

[fatty]

My mach 2 r507 with no load does -74 all day long under the same load as my mach2 gt which has 404 it cools 10 degrees colder than the gt not sure why you would bother with a tev unless you plan to change your running temps???

[C3]

Mhh R507 sounds better ;)
How much coolant did you fill in?
I wanna use a tev cuz afair its easier to adjust ;)

[cold_ice]

You decided for the right evap ;)
You can use either R404a or R507, R507 is a little bit colder. I would take the refrigerant which you can get cheaper.
I would go with a capillary tube, as Firefox said you can achieve good temps without modify the cap tube.
I don't know how many gramms are required but I would charge for the best temps. Braze a shrader valve to the service port, and make a tripple evap. When you're charging with R404a you have to put the bottle upside down (liquid charging). Open the valve on the manifold only very little, so that the liquid "boils off". Until a you reached about 2 bar you should fire it up, and charge for the best load temps.

[gkiing]

My mach 2 r507 with no load does -74 all day long under the same load as my mach2 gt which has 404 it cools 10 degrees colder than the gt not sure why you would bother with a tev unless you plan to change your running temps???

That's actually inaccurate, the actual mach II evap temp would be around -46 loaded with 507, maybe -55 idle. The machII temp probes are wayyyy off, its a well known fact. If indeed it did hit -74 it would be without any load and way undercharged (10" vacuum or somthing).

[fatty]

It runs at about 16mm vaccume unloaded and yes the mach2 sensors are way out but for those using mach2 or 1's it is the only indicator on the machine and most of them read about the same for comparason purposes I dont have a thermometer that will do below -40 as yet so this is why I can not give a very accurate reading however as I said loaded the system show that it is 10 degrees colder at the same speed with 100% load as compared to my 404 gt

Also the charge printed on my gt is 64grams of r404a if that helps anyone loool :stick:

[froudeg]

My mach 2 r507 with no load does -74 all day long under the same load as my mach2 gt which has 404 it cools 10 degrees colder than the gt not sure why you would bother with a tev unless you plan to change your running temps???


Gotta love mach/vapo temp probes...notriously inaccurate NTC thermisitors, uncalibrated connected to uncalibrated controllers...their sub zero temps are out by as much as 20c.

NTC thermisitors r useless as your start to go much below -20celcius, the resistance scales so high that electrical noise throws them off by miles...furthermore they no longer follow the forumulas that are used to calculate the temps.

Unfortunately they dont all read the same either - ive seen differences of over 10c plus from 2 same model units, yet a decent thermocouple meter shows very similar temps

I see people quote mach/vapo temps all the time and it does annoy me as they are totally misleading. It's better not to give any temperature reading than a totally false one which is not only incorrect but also isn't comparable either. Temperatures should only be quoted if using a decent meter, designed to read down to the temps your reading, using good thermocouples or better still RTD PT100/1000 sensors.