What gas for Mach2?

[Lee]

What gas can be used to improve the performance of a Mach2 prommie, at th moment it has R134, it is a standard Mach2, also what cooling improvements would i need. At the moment the condensor temps under normal load are -48 to -50 according to the LCD, load temps drop to about -43 to -45. Not sure of CPU temps because this Gigabyte board doesnt read the FX53 temps properly. Thanks.

[chilly1]

R507 is the easiest to use for mods as it will not fractionate and has no glide. R402 is coldest and R404 has also been used. You can also reprogranm the fans to run full out as this will improve loaded temps at high ambient conditions. With R507 I have seen temps as low as -74 on the display. and loaded temps also on the display of -65

[Lee]

Thanks alot, what temps would i possilbly get from R507 over what i have got.Also would the cap length have to be changed?

[swarzy85]

a question....

i've a mach 2 with standard gas (r134a). If i want to change the gas with r404, i know that i don't have to do any modifications.
But what's the situation if i want to change the gas with r507?
thank you very much :)

[JSU]

its basicaly the same, you dont have to lengthen the cap tube but you will prolly get better temps if you do.

[swarzy85]

ok, it's clear :)
thank you :)

[Epsilon]

The cooling capacity of a refilled mach2 is higher than a r134a system. The temp just crashes @ 200watt heatload.

With r507 you will not have this problem at all (not with ordinairy CPU's that is :D).

Another thing that is really worth doing: reinsulatie the complete suction line with new neoprene hose with atleast 2cm thick walls.

It will give you another 3-4c gain :)

[swarzy85]

what will happen if i'll change r134a with r507?
i heared that the compressor could be damaged during the time...
any ideas? :)

P.S. thank you :)

[chilly1]

You don't want to lengthen the capillary tube unless you want a highter load or a lower load. If you lengthen the capillary you will lose capacity and your temp will be lower but it won't handle the same load. If you shorten the capillary tube it will handle a higher heat load but will run warmer. If you run the compressor at spec pressures, temperatures,amp draw you will not have any problems that you would not have had with R134A, By changing the gas to 507 the only thing that happens basically is that the temperature of teh evap drops, as long as the charge is tuned properly. With stock capillary tube and stock program a MachII suction pressure at 74 degF ambient and after fifteen minuets of runtime with R404 or R507 will have optimal capacity and temperatures with 4 inches of vacume, and this is the same for the machI as well. you can add a little gas to raise thecapacity or take a little away to lower the temperatures but you will see liquid return to the compressor in the former and the compressor will overheat in the latter, to set the charge perfectly the suction line temperature at the compressor will have frost down to the compressor but not on it under load. Unloaded a little frost will appear on the compressor.

[Lee]

Thanks alot, thats what i needed to know. I think ill go with r507 when i get this regased.