Keep in mind pressure is caused by restriction. In the normal pressure sender spot on the block, the restrictions are the various bearings and then the restrictor in the head. If you have your new sender in the feed to the turbo, your pressure *might* be low because the ball bearing in the turbo is not very restrictive. Even so, those pressures are fine.
Bill Cardell TurboDog's Dad www.flyinmiata.com www.fmwestfield.com Sales 1-800-359-6957 Tech 970-464-5600 Before you call, check out http://www.flyinmiata.com/FAQ/ ________________________________ From: [email protected] [mailto:[email protected]] On Behalf Of Steve Willington Sent: Monday, July 27, 2009 4:29 PM To: [email protected] Subject: Oil pressure values A year or so back (I can't remember when exactly) I posted expressing concerns over my oil pressure once my engine fully warmed up. Well for various reasons I have only just found the time to install a proper oil temperature and pressure gauge, in fact this one http://www.spa-uk.co.uk/design/productdetails/?objid=130 but with the blue LED back light. The temp sender is located in one of the ports on this sandwich plate http://www.speedflowshop.co.uk/universal-full-bypass-oil-sandwich-plate- --tvc60-1386-p.asp as is the stock pressure sender (i.e. pre-cooler and filter), whilst the new pressure sender is located in a 'T' from the OEM port in the block (which also supplies filtered oil to the turbo). For reference I have an FM twincooler radiator with smooth bore PTFE lines connected by two 90 deg swept and two 45 deg swept -8AN fittings from this range http://www.merlinmotorsport.co.uk/GOODRIDGE-811-SERIES-%28Fuel-in-Car%29 -811-SERIES-FITTINGS/c108_3256_3258/index.html?osCsid=eb1e2e7acfae944c3a 26a9c4bd39eb41 Once the engine is fully warmed up (oil temp 89 to 90C) and the thermostat open I loose, depending upon rpm, about 15psi (difference between the stock sender and the new sender in the block).When the oil is cool the new gauge reads *roughly* 2 to 5 psi lower than the stock, peaking at about 75psi. Oil is Amsoil signature series 0w30. Here's the values on the new gauge fully warmed up: 950 to 1000rpm = 22 to 23psi. 2000rpm = 37psi 3000rpm = 42 to 43psi 4000rpm = 44 to 45psi 5000rpm = 47 to 48psi Those values, given the presence of the oil cooler, look acceptable to me? Any method (other than going to the expense of -10AN fittings) to reduce the pressure loss? What about the K&N oil filter range? Any thoughts on their claims of being free flowing and offering high levels of filtering? Steve. www.slowmx5.com
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