Quote:
Originally Posted by ajc209
I took it up to 250F last night. Pressure at 7k rpms was ~3.6-3.7 bar ~52-54psi.
I think it must be a combination of the Miller Nanodrive 0W20 (stays thick at high temps  ) and the fact that I dont have an oil cooler. |
Your nanodrive doesn't stay "thick" at high temps, as its cSt is documented at various temperatures. Its viscosity change with temp performs as it should for it's rating.
1: I think you have too little pressure and it needs to be addressed.
2: I also think that pressure should be addressed without unnecessarily sacrificing flow.
3: Increasing viscosity increases pressure not flow, however an increase in viscosity may also be warranted to account for the higher than designed oil temps (aka: maintaining at target cSt at a given temp).
I've experienced the oil-cooler pressure drop on Hondas and from reading about this car the same phenomenon occurs. It stands to reason that's why your pressure reading is greater than on cars with coolers.
So it is my opinion that 2 things need to occur: increase oil viscosity due to your increased temps and increase system pressure by decreasing how much system pressure can be relieved via the pressure relief valve by adding a shim (washer) to the PRV. I bet a 1/8th" thick washer will give you ~10psi
http://www.ft86club.com/forums/showp...&postcount=142
Pic borrowed from Element tuning and modified:
I actually spent last weekend shimming the PRV on my race car because I had a new engine built and thought I had shimmed the pump and I was breaking in the new engine and saw I was about 10psi below where I wanted to be. When I pulled out the PRV I saw I had indeed forgot the shim. Put it in and back is my 10psi. I did this because I didn't want to run a thicker oil, I wanted to increase both flow
and pressure and it's why my race engines have gone the distance.
Quote:
Originally Posted by steve99
dealers in australia and south africa are putting in 5w30 or 10w30 at standard service in some cases.
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You brought this up in another thread it makes all the sense in the world to me. I'm in Seattle and I buy cases of Amsoil 0w-30 in the race car so I now also use that in the FRS.