A/C delete

[amg6975]

I want to revive this ancient thread because I'm building a 1 series track car with S65 swap and wanted to remove AC for weight savings. I [think I] found the golden ticket to this... the S85 never swapped belt direction and the PS pumps are all over the place for fairly cheap, and bolt right on.

The mounting bracket from the S65 has to be swapped over since the mount is slightly different on the S85. The input connection is at a slightly different angle on the S85 pump but it doesn't appear to be an issue. If it leaks I'll just replace that pipe with a more flexible one with worm gear hose clamps.

Since I haven't fired it up my only though/concern now is the flow rate will be significantly different and the PS will feel too heavy or too light, but I doubt it. I'll try really hard to remember to report back when I get the car together.

UPDATE: Car is together and drives perfect with the S85 pump.

I had to try a couple different belts and you'll want a 31.5-32" belt. I found the KRC 4060320 that fits perfect.

S85 PS pump PN: 32412282951
Belt: KRC 4060320 https://www.krcpower.com/ecommerce/part-gdy-4060320.asp

[SYT_Shadow]

That is super useful information!

[amg6975]

Originally Posted by SYT_Shadow

That is super useful information!

Thanks!

I just got the Gates belt and it's too long. It measure 33.5." Autozone has a Continental 4060325 in stock locally I'm going to get tomorrow and try, should be 32.5" and be just right. I'll update above if it works.

Edit: Ugh, still slightly too long. Trying a 31.5" KRC belt now.

Edit Edit: The KRC 4060315 belt fits great, updating the post above.

Edit Edit Edit: 4060320 fits better, the 315 was too tight, I was worried about it pulling on the main bearings too hard.

[M_Torx]

am wondering why has a company not made a bracket with pullley on it that's goes in the same spot as AC compressor that would be so simple keep stock belt ???

[amg6975]

Alright, Important update here. I actually had a suction hose failure on my car, which I'm chalking up to the angle of the S85 pump's inlet putting some tension on it. That with repeated track use split the hose.

I got to thinking and looking and trying to figure out how to fix this for good and since the two housings look identical other than that input angle, I figured I'd pop them open to see if the guts of the S85 pump could simply be put in the S65 housing. Can't hurt to look.

Sure enough, they're identical other than the direction the orifices face so I just put the S85 guts into the S65 housing, all new hoses, and away we go. This actually happened in the spring [and I forgot to update this] so the car has some road miles and many track days on it with flawless results.

I reused the same belt as above.

[tlrid3r]

Originally Posted by amg6975

Alright, Important update here. I actually had a suction hose failure on my car, which I'm chalking up to the angle of the S85 pump's inlet putting some tension on it. That with repeated track use split the hose.

I got to thinking and looking and trying to figure out how to fix this for good and since the two housings look identical other than that input angle, I figured I'd pop them open to see if the guts of the S85 pump could simply be put in the S65 housing. Can't hurt to look.

Sure enough, they're identical other than the direction the orifices face so I just put the S85 guts into the S65 housing, all new hoses, and away we go. This actually happened in the spring [and I forgot to update this] so the car has some road miles and many track days on it with flawless results.

I reused the same belt as above.

Thanks for share. Are the pump rebuildable.
I have an 2008 s65 pump and worried about its age.

[amg6975]

Originally Posted by tlrid3r

Thanks for share. Are the pump rebuildable.
I have an 2008 s65 pump and worried about its age.

Probably but I really wouldn't worry about it. Not much to go wrong in it. I'd be more concerned about the lines and reservoir. Upgrade the cooler while you're doing it.

[tlrid3r]

Originally Posted by amg6975

Probably but I really wouldn't worry about it. Not much to go wrong in it. I'd be more concerned about the lines and reservoir. Upgrade the cooler while you're doing it.

All that you mentioned I have already done so. This is why my last concern was the pump. 2008 pump are expensive

[amg6975]

Originally Posted by tlrid3r

All that you mentioned I have already done so. This is why my last concern was the pump. 2008 pump are expensive

I would suggest just buying a new/rebuilt S85 pump and doing what I did. Basically the same thing as rebuilding it and way easier/cheaper than finding an OG S65 pump. It wasn't all that hard to do.

I couldn't find the gasket anywhere but reusing the one off my fairly fresh S85 pump worked fine.

[Antz M3]

Originally Posted by amg6975

I would suggest just buying a new/rebuilt S85 pump and doing what I did. Basically the same thing as rebuilding it and way easier/cheaper than finding an OG S65 pump. It wasn't all that hard to do.

I couldn't find the gasket anywhere but reusing the one off my fairly fresh S85 pump worked fine.

Looking at getting the s85 pump for my s65 as the earlier style pumps are now £950 from bmw with extremely limited availability… I can get a brand new s85 pump for £300. If I were to change to suction hose to a slightly more flexible style do you think this would avoid it ever splitting? Or would it just be easier changing over the internals like you did? Assume no issues since with yours?
Thanks

[amg6975]

Originally Posted by Antz M3

Looking at getting the s85 pump for my s65 as the earlier style pumps are now £950 from bmw with extremely limited availability… I can get a brand new s85 pump for £300. If I were to change to suction hose to a slightly more flexible style do you think this would avoid it ever splitting? Or would it just be easier changing over the internals like you did? Assume no issues since with yours?
Thanks

There is not a lot of room between the suction hose and the belt tensioner so just using a longer/more flexible hose probably won't work as I think it will rub. I would just get an S85 pump and rebuild your S65 pump with the internals from the S85 unit. Should be identical.

[rhyary]

Will this option from FCP works for a/c delete

[rhyary]

On the FCP site they are listing the same PS pump for 2008 and 2013 so I contacted them for clarification