04-14-2010, 12:17 PM
Join Date: Jun 2008
Location: Houston, TX
Total Cats: 4
Originally Posted by railz
Travis offers to shim his high flowing pumps free and im not sure if I would want to do this?
Also tried calling Travis directly but his phone has been dead all day.
I searched and found some stuff but I'm still confused, Some say the con would be sky high oil pressure at cold start up. Would high oil pressure at cold start cause seal's to blow out? No one really explained the cons for the retards like me.
The advantage given though is more oil flow at warm up correct?
Why would or wouldn't I want to do this?
So if having the BE pump shimmed is the way to go how much should I have it upped by?
and so on in increments of 7psi
As for my build im running a 2554 and plan to max it out at over 220rwhp for now but will eventually move up to a larger turbo to make 270+rwhp so keep this in mind if I will need that extra pressure later on.
Sorry about the delay. I'm just recovering today to get around to my customers. I would run 1 shim in the unit.
Its a good question though I should probably throw something in the description explaining it.
The high volume oil pump provides more volume of flow at a lower back pressure kind of like a larger turbocharger does. The passages are widened, the pump is physically larger, and the efficiency is increased. The only way to increase flow past this point is to increase pressure. Like a water hose the higher the pressure the more the flow to the bearings and etcetera.
That's where shimming comes in. We can put shims in the relief valve spring to cause it to open only under more pressure. A bearing's maximum load is by a couple factors but flow is a big one. So higher pressure= higher flow=more bearing load capability. I only really recommend one shim for most people. beyond that you could end up running super high pressures at start up and maybe risk seals.
If you decide to purchase I would just go with one shim unless you're really running a lot more of a race vehicle then a street vehicle. Hope this helps and let me know if you have any other questions.