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Motorsports & Track Forum by BimmerWorld
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Old 04-13-2010, 08:24 PM   #21
PEI330Ci
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Originally Posted by vaio76109 View Post
What do you consider low oil pressure? My 15psi oil pressure warning light comes on at idle once the oil is hot.
How about 7 psi
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Old 04-13-2010, 09:25 PM   #22
vaio76109
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Originally Posted by PEI330Ci View Post
How about 7 psi
I'm not sure what mine's at, all I know is that it's below 15. I'll keep an eye out next time.
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Old 04-14-2010, 06:26 PM   #23
xixixi
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oil pump nut has to be related to LTW flywheel 3k miles after my install the nut came loose, without tracking my car. I could have had bad luck who knows this is just my 2 cents. I had my nut loctited and staked it 6 places. I hope it holds
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Old 04-15-2010, 09:45 AM   #24
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Originally Posted by xixixi View Post
oil pump nut has to be related to LTW flywheel 3k miles after my install the nut came loose, without tracking my car. I could have had bad luck who knows this is just my 2 cents. I had my nut loctited and staked it 6 places. I hope it holds
You might wanna check your vibration damper (aka crank pulley) too - I dunno what to look for, but that's the part designed to keep oil-pump-nut-unscrewing, oil-squirter-cracking harmonics in check. As TxZHP04 pointed out somewhere - it is made with rubber, so it probably doesn't last forever.

Yesterday I found this article that talks about that and it even mentions the dual mass flywheel springs as helping a little:
http://www.atiracing.com/products/da...mper_dinan.htm
It's written by the ever conservative Steve Dinan for whatever that may or may not be worth.
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Old 04-15-2010, 01:28 PM   #25
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In a nutshell, if you are going to race the car, you need to fix the pump. There are only two options that work:
1. The alternate shaft where the sprocket is bolted on the shaft (as been previously mentioned)
2. The BMW Motorsport oil pump setup.

If you rev the motor continuously over 6500rpm, expect to see things like this:
1. The timing wheel explodes
2. All of the rollers in the oil pump chain will be in the bottom of the pan after a while.
3. Harmonic balancer will start to come apart.

If you run a lightweight flywheel, then expect points 1-3 to happen at an accelerated rate.

I have never had long term success with the VAC oil pump shaft. Thus I don't use it. I run the BMW Motorsport on my car.
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