Originally Posted by Lufty
Zee- thank you for posting that conversation. I remember the restriction levels (I screen shot them) Motorking gave for the 4 different levels of filters Fram offered. The Ultra was very close to the Race filter in restriction but Fram also only tested at 3 gpm.
So with "improved flow" is this going to be the same flow with less restriction in your opinion?
I understand the price being higher will shy some people away for what your actually getting. But also IMO someone seeing "improved Flow" on the box and along with the excellent filtering (like the Ultra) they will be making a trip to AAP to buy one of these Titanium filters. Flow/restriction has come up a lot in these oil filter threads over the years.
Yes, their claim of "improved flow" is going to really mean a little less delta-p across the filter at the same viscosity and flow rate. Since engines use a PD oil pump, the flow is essentially the same through the filter, but depending on the filter's flow restriction the delta-p across the filter will vary.
Even just knowing the flow restriction at one data point (given oil viscosity, flow rate and resulting delta-p) is better than nothing. A filter that has less delta-p at 3 gpm is going to also have less delta-p at a higher flow rate with the same oil viscosity. If you've see delta-p vs flow curves you will see that correlation.