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TPI with C5 filter/regulator?

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Old Jan 19, 2012 | 03:42 PM
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Default TPI with C5 filter/regulator?
Anyone know of a reason I can't use the C5 FPR/filter with an external pump for my TPI swap?
I can't think of one.
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Old Jan 19, 2012 | 04:05 PM
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Fuel pressure. Cant remember what the tpi runs at but the C5 ones gives about 60 psi. TPI as I recall runs at a lower pressure
Last edited by Gordonm; Jan 19, 2012 at 05:58 PM.
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Old Jan 19, 2012 | 04:56 PM
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Originally Posted by Gordonm
Fuel pressure. Cant remember what the tpi runs at but the C5 ones givecabout 60 psi. TPI as I recall runs at a lower pressure
YES, in the 40-42 psi region....run the pump without engine...

with engine idling it's closer to 35 psi....full mani vac to the regulator or whatever sending unit is involved....
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Old Jan 19, 2012 | 04:56 PM
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TPI runs in the mid 40s IIRC.
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Old Jan 19, 2012 | 05:04 PM
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There goes my short return line idea
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Old Jan 19, 2012 | 06:19 PM
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Default TPI/C5 reg
Originally Posted by moonsteel
Anyone know of a reason I can't use the C5 FPR/filter with an external pump for my TPI swap?
I can't think of one.

Unless you gut it, there is still the regulator on your fuel rail crossover, with the return.

The pressure difference (3 bar vs. 4 bar) is no problem if your tuner does the math for the difference in fuel flow.

The factory ECU may harder to program given the fact that the C5 reg is not vacuum referenced.

Rob
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Old Jan 20, 2012 | 11:07 AM
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My plan was to remove (or gut) the rail FPR.
I'm the tuner (done megasquirt twice and SDS once), I'm planning to install the holley EFI HP kit http://www.holley.com/550-601.asp

Sounds like it is feasible, are there guys running 4 bar?
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Old Jan 20, 2012 | 11:22 AM
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Can I use the stock feed line, or will it be too small?
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Old Jan 20, 2012 | 11:29 AM
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If your stock fuel line is 3/8 it will support up to around 600 HP. I am using it with about 530 or so.
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Old Jan 20, 2012 | 11:38 AM
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Originally Posted by Gordonm
If your stock fuel line is 3/8 it will support up to around 600 HP. I am using it with about 530 or so.
is 3/8 stock size on 1974?
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Old Jan 20, 2012 | 11:52 AM
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Originally Posted by moonsteel
My plan was to remove (or gut) the rail FPR.
I'm the tuner (done megasquirt twice and SDS once), I'm planning to install the holley EFI HP kit http://www.holley.com/550-601.asp

Sounds like it is feasible, are there guys running 4 bar?
It is easy with the Holley system. Their set up screens allow for different fuel pressures and returnless regs.

Rob
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