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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Jan-10-2019, 07:23:33 PM   #1
TramRam
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Default Anybody Have VAC's High Perf. Oil Pump?

I had a spun conn rod bearing and am going with Lang's lower end upgrade. In conversation came thoughts of possible damage to my oil pump. In checking around for rebuilders, I found that VAC Mtrspts offers an high performance upgrade to our existing pumps for which they claim an appx. 22% flow increase over stock for less than a new stock pump if you send them your used unit. It sounds good to me...any thoughts/experience to turn me around on considering this?
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Old Thu, Jan-10-2019, 07:33:44 PM   #2
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

I replaced my pump with the high performance VAC unit when I did my bearings. There was some scoring on the internals of the pump so figured better safe than sorry.

This was recommended by Matt Coyne (who did the job, see Coyne Performance) and when he did my engine rebuild said that the oil pressures were great even with the conventional oil used for break-in (which one would expect with an upgraded pump).

Long story short, I have no regrets [yet] and donít see much downside other than the price tag (keep in mind the core refund might be less than you expect).

Thereís mixed reviews on VAC out there and I know some people personally who have had poor experience with them and their parts, so thereís that. But Iím happy with my upgrade and donít see much downside.


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Old Thu, Jan-10-2019, 07:51:26 PM   #3
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

VAC claims a 22% increase in volume I'm not sure that directly correlates with oil flow. Price difference is pretty negligible and with the horror stories/reliability of VAC, I chose to stick with a new OE pump considering its proven to be more than sufficient for 99.9% of us. If you're having your motor spec'd by Lang then go with whatever he recommends.
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Old Thu, Jan-10-2019, 07:52:08 PM   #4
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

Good to know about your experience! Brian told me that they oversize one side of the twin chamber pump and put a larger wheel in there with the new shaft and reuse the other gear if it's in good shape. He did say that they check the pres. relief spring's resting height and if it meets spec, the clean everything up put it back together and ship it! I asked if they bench test it...he said they've done so many that simply by knowing the performance of the gears they put in there, they know the flow numbers that they will hit. I guess I'm good with that. Thanks again for your reply. Be well!
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Old Thu, Jan-10-2019, 08:11:56 PM   #5
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

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Originally Posted by TramRam View Post
Good to know about your experience! Brian told me that they oversize one side of the twin chamber pump and put a larger wheel in there with the new shaft and reuse the other gear if it's in good shape. He did say that they check the pres. relief spring's resting height and if it meets spec, the clean everything up put it back together and ship it! I asked if they bench test it...he said they've done so many that simply by knowing the performance of the gears they put in there, they know the flow numbers that they will hit. I guess I'm good with that. Thanks again for your reply. Be well!
These are signs to stay away... Too lazy to check a component that will be vital for your engine build. What happen when your engine lock up due to no oil pressure? I have a feeling they will say its your fault and deal with it....
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Old Thu, Jan-10-2019, 08:27:03 PM   #6
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

I read you Zack...I wonder how anyone half-assed could yuk up a pump rebuild like this in that it's really a simple positive pressure pump. Mine is in excellent shape with barely noticeable scores in the housing where the gears spin against (with oil present). I DID find a small strip if conn. rod bearing inside there though.

M3 MD: Did you flush your oil filter housing out and replace your oil cooler while you were in there? I'm looking to do those on mine. There are those who recommend replacing the cooler so I'm leaning that way.

Funny that Andrew won't recommend an oil weight other than 10w60 but I am SURE that that is ass protecting. From all I have read, 10w60 was the Band-aid for the improperly sided rod bearing and the clearance there which all goes away with his lower kit.

Thanks for t he chat guys
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Old Thu, Jan-10-2019, 08:37:32 PM   #7
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

Quote:
Originally Posted by TramRam View Post
I read you Zack...I wonder how anyone half-assed could yuk up a pump rebuild like this in that it's really a simple positive pressure pump. Mine is in excellent shape with barely noticeable scores in the housing where the gears spin against (with oil present). I DID find a small strip if conn. rod bearing inside there though.



M3 MD: Did you flush your oil filter housing out and replace your oil cooler while you were in there? I'm looking to do those on mine. There are those who recommend replacing the cooler so I'm leaning that way.



Funny that Andrew won't recommend an oil weight other than 10w60 but I am SURE that that is ass protecting. From all I have read, 10w60 was the Band-aid for the improperly sided rod bearing and the clearance there which all goes away with his lower kit.



Thanks for t he chat guys


Reused the same oil cooler given no signs of fatigue and running good temps otherwise.

Figured this would insight some animosity towards VAC but to be honest their customer service seemed great to me granted I havenít had issues *knock on wood*. Also like you said this is a basic positive pressure pump seems relatively hard to botch


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Old Thu, Jan-10-2019, 08:50:11 PM   #8
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

Is the sprocket shaft upgraded or is that not an occasional issue on the S54 like it is on the S52.
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Old Fri, Jan-11-2019, 01:03:26 AM   #9
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

I woukd just use stock, there isnt really evidence that you need a bigger volume pump
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Old Fri, Jan-11-2019, 01:09:36 AM   #10
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Default Re: Anybody Have VAC's High Perf. Oil Pump?

Yes, new sprocket and hardened shaft drilled for safety wiring to the nut.
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Discussing Anybody Have VAC's High Perf. Oil Pump? in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)