Fram Ultra on a Subaru BRZ

[slacktide_bitog]

Originally Posted By: Nate1979
Originally Posted By: slacktide_bitog
Ask Motorking why the difference

Been there done that. Posted the data on here many times why its a non issue. The engineering data from Motorking for Fram Ultra has been posted many times specifically to answer why there is no reason for the high bypass pressure. Bypass pressure is media specific. There is no bypass pressure spec. Fram makes them both and say there is no issue to run the Ultra in a Subie.

But let's rehash this again. I failed to find the bypass spec in my owners manual. Why it needs to be discussed every month I don't know.


No, I meant the difference between the 3593A and 9688

 

[Izb]

I guess that XG3593A on FA/FB20/25 will be the best choice.

 

[Izb]

How do you think, does XG3593A and XG9688 have the same bypass valve?

I have received such answer from Fram:
XG9688 relief Valve Setting PSI=9-15 ( it's dependent on oil flow rate )
XG3593A relief Valve Setting PSI=12 ( precisely 12 no more no less )

But I don't understand, how it can be dependent on oil flow rate...
It is very interesting to cut both filters and compare valves...

 

[ZeeOSix]

Originally Posted By: Izb
How do you think, does XG3593A and XG9688 have the same bypass valve?

I have received such answer from Fram:
XG9688 relief Valve Setting PSI=9-15 ( it's dependent on oil flow rate )
XG3593A relief Valve Setting PSI=12 ( precisely 12 no more no less )

But I don't understand, how it can be dependent on oil flow rate...
It is very interesting to cut both filters and compare valves...


The theory is that if the spec shows a range like 9-12 PSI, then the valve starts to crack open at 9 and is fully open at 15 PSI. If it just shows one number like 12 PSI, then it means the valve starts to crack open at 12 PSI. These are spring loaded type of valves that open more and more as the delta-p increases.

XG9688
http://www.fram.com/Search-Parts/Part-Detail?PN=XG9688

XG3593A
http://www.fram.com/Search-Parts/Part-Detail?PN=XG3593A

 

[dlundblad]

No issue whatsoever with using a lower bypass filter.

The OEM Mann for the A4 as well as the WIX is around 33 PSI. The M1-204 is also spec'd for the car, but has a 12 PSI bypass rating.

And to make matters a bit more fun, the OEM Audi filter with the 33 PSI bypass is also spec'd for my Jeep. The OEM is a 12 PSI bypass.

 

[SHOZ]

The pressure valve rating and start up rattle would see to be related? On Hyundais they take a 20 psi OEM filter and I've always figured a lower bypass number would get the oil flowing faster when cold.

 

[dlundblad]

Oil flow is constant regardless of bypass pressure with a positive displacement pump.

I would blame start up rattle on a faulty ADBV.

 

[Izb]

Originally Posted By: ZeeOSix
Originally Posted By: Izb
How do you think, does XG3593A and XG9688 have the same bypass valve?

I have received such answer from Fram:
XG9688 relief Valve Setting PSI=9-15 ( it's dependent on oil flow rate )
XG3593A relief Valve Setting PSI=12 ( precisely 12 no more no less )

But I don't understand, how it can be dependent on oil flow rate...
It is very interesting to cut both filters and compare valves...


The theory is that if the spec shows a range like 9-12 PSI, then the valve starts to crack open at 9 and is fully open at 15 PSI. If it just shows one number like 12 PSI, then it means the valve starts to crack open at 12 PSI. These are spring loaded type of valves that open more and more as the delta-p increases.


Excellent theoretical(!) explanation.
But I'm pretty sure that all filters FRAM XG have the same structure of the bypass valve and do not understand where the difference.

 

[ZeeOSix]

Originally Posted By: Izb
Originally Posted By: ZeeOSix
Originally Posted By: Izb
How do you think, does XG3593A and XG9688 have the same bypass valve?

I have received such answer from Fram:
XG9688 relief Valve Setting PSI=9-15 ( it's dependent on oil flow rate )
XG3593A relief Valve Setting PSI=12 ( precisely 12 no more no less )

But I don't understand, how it can be dependent on oil flow rate...
It is very interesting to cut both filters and compare valves...


The theory is that if the spec shows a range like 9-12 PSI, then the valve starts to crack open at 9 and is fully open at 15 PSI. If it just shows one number like 12 PSI, then it means the valve starts to crack open at 12 PSI. These are spring loaded type of valves that open more and more as the delta-p increases.


Excellent theoretical(!) explanation.
But I'm pretty sure that all filters FRAM XG have the same structure of the bypass valve and do not understand where the difference.


I agree ... it's strange they don't spec them the same, either with on number or a range. Makes it confusing. Might try calling Fram Tech line to see if they can explain.

 

[Izb]

Originally Posted By: slacktide_bitog
Ask Motorking why the difference

Answers from Motorking:
"Because our design engineers have decided that our standard valve (9-15) meets the requirements of the XG9688 and the XG3593A requires a more precision valve."

I am very surprised that XG9688 and XG3593A have different bypass valves...
It will be interesting to close both used filters and compare by myself.

 

[dlundblad]

Originally Posted By: Izb
Excellent theoretical(!) explanation.
But I'm pretty sure that all filters FRAM XG have the same structure of the bypass valve and do not understand where the difference.


Same design yes, but what about the bypass spring's tension?

I personally can't see the 2 filters behaving differently.. unless the old Hyundai TSB has something to do with the PSI range on the xx9688.