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The mkiv Supra Owners Club

Stock Fuel Filter Restriction and threads?


dandan

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Anyone know what the perceived limit is flow wise with one stock fuel filter? At what sort of power levels do people generally swap it out?

 

Can anyone tell me the threads sizes entering and exiting the filter please?

 

Thanks

 

Dan

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Two stock filters in parallel. Should allow the fuel to flow sufficiently with -6 lines?

Why would you bother though?

 

If you're going to run a new line it might as well be a single -8 and -8 fuel filter...keep it simple and you reduce the risks. IMO.

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I know people take it out when they upgrade the fuel lines.

 

By what you've said Alex, anyone genuinely in need of 650's is on the limit of the stock filter's capacity. Simply swapping out 440's (or even 550's) and dropping in the 650's would potentially leave a problem with the stock filter. Any reasoning/investigation behind saying the filter is restriction at 500rwhp?

 

Anyone ever investigated when the filter actually becomes a problem? Any flowrate or pressure figures around anywhere?

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Why would you bother though?

 

If you're going to run a new line it might as well be a single -8 and -8 fuel filter...keep it simple and you reduce the risks. IMO.

 

Well I'm going to run two in parallel as I have a box of 20 to use up :p

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I'm fitting an aeromotive fuel filter. Having a system that splits at or before the fuel filters would be even more expensive. I'm ordering the lines and fittings on monday morning for a complete new set-up and it's already costing £850 odd quid (not including the twin pump hanger - :sex:) That's a single line up to an aeromotive filter and splitting afterwards to the rail. Of course that's all braided lines and aeroquip fittings, so I guess it could be done cheaper.

 

As far as the flow rates of the stock filter, I'm not using it, not because I know something other don't. It's just that most components will be designed with the rest of the system in mind. Measuring the flow rate, or pressure drops before and after the filter will be a bit tricky, so it's easier just to play it safe, and run two stock, or maybe a high flow rate filter.

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