 Considering Weltmeister oil press boost kit, Low pressure at Idle, when hot |
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| RohJay |
 Feb 3 2016, 08:20 AM
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#1
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Member  Group: Members Posts: 189 Joined: 24-April 07 From: Colombo, SRI LANKA Member No.: 7,689  |
What should Oil Pressure be at Idle when Hot for a 1.8 L-Jet?
Mine idles at about 0.75 Bar ( 10.8 PSI) after driving in traffic. Which I assume is too low , as the Green light comes on. At cold start I see 1.5 Bar (21 PSI). I am using a VDO 5 Bar gauge ( from late 80's VW Golf Cabrio) and matching sender. Sender is fitted to stock Oil Press Light switch location, via a braided SS hose. I have a recent oil change ( 40W ) and idle is about 1000 rpm. I am contemplating fitting the Weltmeister Oil Pressure Boost Piston kit. Anybody have experience with this product? Thanks |
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| cary |
Feb 3 2016, 08:26 AM
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#2
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Advanced Member Group: Members Posts: 3,900 Joined: 26-January 04 From: Sherwood Oregon Member No.: 1,608 Region Association: Pacific Northwest 
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Cold Start ............. 20 PSI ?
What is the ambient temperature ? Another alternative. http://www.tangerineracing.com/oilpressurerelief.htm Either way I'd talk to Chris. My .02c. |
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| RohJay |
Feb 3 2016, 08:33 AM
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#3
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Member Group: Members Posts: 189 Joined: 24-April 07 From: Colombo, SRI LANKA Member No.: 7,689 |
QUOTE(cary @ Feb 3 2016, 07:56 PM)  Cold Start ............. 20 PSI ? What is the ambient temperature ? Another alternative. http://www.tangerineracing.com/oilpressurerelief.htm Either way I'd talk to Chris. My .02c. Thanks for the info. I used "cold start" incorrectly. I meant once the engine had cooled down. Ambient temp about 34 C ( approx 93 F ) |
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| McMark |
Feb 3 2016, 08:40 AM
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#4
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914 Freak! Group: Retired Admin Posts: 20,179 Joined: 13-March 03 From: Grand Rapids, MI Member No.: 419 Region Association: None |
The stock pressure switch opens between 2-6psi. The aftermarket ones open at 12psi. So technically, you're above the stock recommendation. The factory manual recommends a 'wear limit' of 28psi @ 2500 rpm with the oil at operating temp.
The oil you use (not just weight, but brand as well) can have a significant effect on the pressure reading. All that being said, I think Chris' upgrade piston is a great investment. |
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