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#15
by
ezekiel
on 13 Nov, 2006 00:15
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cryo treating is the process of continueing the heat treatment process by chilling.
When you heat treat metal, you heat it up, then quench it. The quenching takes the heat out really fast, and it changes the grain structure of the metal.
Cryo treating takes this one step further by bringing what would be the final quench temperature down to WELL below freezing.
It makes metal VERY hard, and extremely wear resistant, and less prone to cracking and stress breaking.
They cryo treat brake rotors alot. It helps significantly in the longevity due to rotor cracking because of the stresses that a brake rotor is under.
Cryo treating your gears is a very good idea if you're in there anyway cause it'll remove the possibility of stress fractures and sheering teeth off the gears.
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#16
by
Turbinepowered
on 13 Nov, 2006 01:10
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cryo treating is the process of continueing the heat treatment process by chilling.
When you heat treat metal, you heat it up, then quench it. The quenching takes the heat out really fast, and it changes the grain structure of the metal.
Cryo treating takes this one step further by bringing what would be the final quench temperature down to WELL below freezing.
It makes metal VERY hard, and extremely wear resistant, and less prone to cracking and stress breaking.
Ohhhh... that makes sense. I figured it was something involving extreme cold, but considering a lot of metals get brittle and crack when subjected to extreme cold, it didn't make sense.
Where would one send things to have this done? I'll be taking apart/rebuilding an 016 at some point eventually anyway, might as well do this then.
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#17
by
ezekiel
on 13 Nov, 2006 02:33
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I haven't actually sent anything out, so I can't give experience with anyone, but there are a few to be found through google.
www.300below.comhttp://www.metal-wear.com/racing_component_prices.htmwww.onecryo.com these guys are somewhat local to me, I'll probably end up going with them since I don't have to ship anything, and can see their shop.
the really weird thing about cryo treating is that alot of professional musicians cryo treat their instruments. They report that they have a brighter, fuller sound. Really weird!! It's all on a molecular level, but they cryo firearms, and the like too.
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#18
by
jtanguay
on 14 Nov, 2006 02:40
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looks like the process isn't just throwing something into a vat of liquid nitrogen hehe... actually giving a gradual change in temperature is probably what strengthens the molecular structure of whatever is cryo'd...
makes me wonder just useful it could be... on an aluminum head maybe?
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#19
by
anarchyx34
on 14 Nov, 2006 05:00
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I just drove about 230 km to pick up a CHE tranny with 0.71 upgraded 5th gear, and 80% limited slip for $200 bucks... thanks to burn_your_money for the heads up. Only 289000km on the tranny too... awesome deal!!!!
cant wait!!! its from a mk3
Final 1st 2nd 3rd 4th 5th
3.67 3.45 1.94 1.29 0.97 0.71
about 125 kph @ 3000 rpm... can you dig it? man i think i'm going to just tear my old box apart and learn what i can... its not worth much since the gearing sucks... barely 100 km/h @ 3000 rpm sucks! great for passing on the highway, but not much else.
only regret is that i didnt see it sooner... not that i would have had the $1500 for the tranny + 1.9TD... that had an upgraded turbo from a 1.6... but still... what a deal for a nice big motor.
Sounds great. Is the CHE a direct bolt in to the MK2? I'd be interested in doing that as well.
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#20
by
burn_your_money
on 14 Nov, 2006 13:20
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I just drove about 230 km to pick up a CHE tranny thanks to burn_your_money
You're welcome. I was wondering who bought it. It's been for sale for months. I hope it treats you well
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#21
by
jtanguay
on 14 Nov, 2006 13:52
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I just drove about 230 km to pick up a CHE tranny thanks to burn_your_money
You're welcome. I was wondering who bought it. It's been for sale for months. I hope it treats you well
well i'm definitely going to treat it well
i'm going to test the oil extreme concentrated additive mixed in with some redline in it.
the 90mm flanges will stick right on to this tranny... very good buy! I've never driven a VW with pretty much any limited slip differential, so I cant wait!!!
I wouldn't go with the CHE stock tranny unless you're going to upgrade the 5th gear to 0.71... CHD does come with a 0.75 5th gear though... gives you about 74.3 MPH @ 3k rpm where the CHE with 0.71 gives 78mph @ 3k rpm. pretty slick! eat that you dirty old tranny in my car that i'm going to tear into and rape!!!! mwahahahahaha :twisted:
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#22
by
VWCaddy
on 15 Nov, 2006 11:24
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I sent my gear set to
http://www.nwcryo.com/, looks like similar prices to the other places. I had my gears treated since I blew up my old set and wanted something stronger to replace them with.
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#23
by
hillfolk'r
on 16 Nov, 2006 20:29
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id use a 7A box
when i build a good box for the tdi here,il lsend out the gears for the cryo,cause ive already blown out a 3rd gear
and if i build a 7A witha 3.67 i really dont wanna do that again :roll:
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#24
by
fatmobile
on 18 Nov, 2006 00:01
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I just drove about 230 km to pick up a CHE tranny with 0.71 upgraded 5th gear,
AMC, DFQ, CHE, i was looking on gear up, looks like these mk3 transmissions would be rather nice as well, 3.67, 1=3.45, 2= 1.94, 3= 1.29, 4= .97, and 5=.80. i think 5th gear would need some changing on that haha. could be a little tall, but i think the later transmissions could take a little more beating
I think the CHE, DFQ are 16V tranys with the bigger input shaft and have read that the 8V .71 gear can't be swapped over to the 16V trany.
That makes the CHE with the .71 swap very special, great trany. Take it easy on reverse in that one, I've heard they are weak in that trany.... had to swap one for a guy because he got tired of using his foot to back up.
I really like the AGS, and it fits an A1 or A2, has the studs for the rear motor mount and the bolt holes for the A2 mount.
id use a 7A box
when i build a good box for the tdi here,il lsend out the gears for the cryo,cause ive already blown out a 3rd gear
and if i build a 7A witha 3.67 i really dont wanna do that again
Why the 7A? I noticed my newest Rabbit GTI diesel project has a 7A in it.
I didn't see it on your list of 3.67s. so you swapped in a 3.67 and kept the rest of the gearing the same?
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#25
by
hillfolk'r
on 18 Nov, 2006 08:25
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i didnt build that box yet
im sayin that a 7A with a 3.67 would be nice in my tdi-m
but a std 7A is nice in a td
my 84 jetta td had one,it worked good
currently this asf that i got dropped right in
it has all the extra bosses to fit the mk1
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#26
by
jtanguay
on 18 Nov, 2006 09:04
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the che tranny i bought used to be hooked up to a '95 jetta diesel 1.9TD.
the guy upgraded from his 1.9TD to a VR6... not sure why... must have money to burn
so if this tranny is vr6 compatible, why would he toss it?
shouldn't it fit? looks about the same... i guess we will find out!
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#27
by
screwedrado
on 18 Nov, 2006 09:22
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This is great info, thanks to everyone for posting
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#28
by
jtanguay
on 19 Nov, 2006 21:17
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i was just thinking about cryo treating... it makes a lot of sense doesn't it? for starters, look at snow flakes. if its too cold, you get hail. the cryo treating process starts slowly, to allow the molecules to uniformly position themselves in a solid matrix. too fast, and you'd get hail... lol
i wonder though... if stress and extreme heat etc. would render the cryo process useless? very interesting none the less!
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#29
by
935racer
on 19 Nov, 2006 21:46
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the che tranny i bought used to be hooked up to a '95 jetta diesel 1.9TD.
the guy upgraded from his 1.9TD to a VR6... not sure why... must have money to burn so if this tranny is vr6 compatible, why would he toss it?
shouldn't it fit? looks about the same... i guess we will find out!
Vr6 trannys have a different bellhousing, you can swap bellhousing from 4cyl to 6cyl though, but it requires a complete tranny teardown.