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PostPosted: May 8, 2024, 11:27 am 
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The fuel pressure varies with ecu demands. Some ford system pumps are pulse width modulated and some are switched off and on (like a fuel injector duty cycle) from a control module that receives demands from the ecu. There are other sensors as well when using the oem system. Simpler is often better for practical reasons.

I like the specs on your linked pump but it is about 3x what it should cost. An inline replacement pump for a 90s ford truck should be plenty but inline pumps can starve for fuel and fail early. There are many discussions about pumps and surge tanks. In tank is better and worth the extra effort imho.

Since this will be tuned with the ms, the fpr location before or after is not critical. It just needs to be near the rail.

TBI, I don't know enough about the NC system to answer that. I'm old and like old things. Did I mention I love carbs? Seriously though, I would suggest a used, mazda service manual for an NC miata but I guess they don't print them anymore. Should be a disc or something similar to buy online.

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Ford IFS viewtopic.php?f=5&t=13225&p=134742
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LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


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PostPosted: May 8, 2024, 12:54 pm 
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doommachine wrote:
are returnless systems more comon on high pressure designs? The Duratec is using 55psi on a return less system.

The point of return-less is lower evaporative emissions (by keeping the fuel cooler) and that only works if you're able to modulate the pump. 55psi is not necessarily "high pressure". Traditionally multiport injected engines run between 40 and 60 psi, with 45-ish being very common. Manufactures have used both return and return-less at those pressures. Unless you can modulate the pump there is no real performance advantage to return-less. Personally, I prefer a return style system as it helps with hot starts. If I was running a ragged edge turbo car I would care more about cooler fuel.

doommachine wrote:
…my initial thought was a 60gph 60psi inline pump close to the sump. meeting engine demand for pressure with plenty of flow overhead.

A couple things to keep in mind with oversized pumps (with return systems):
The regulator needs to be sized big enough to bypass any and all overhead fuel
The more overhead you have, the more fuel the pump pressurizes and moves, the more heat gets added to the bulk fuel.

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PostPosted: June 7, 2024, 12:39 am 
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Miatav8, you were talking about this factory exhaust ?
https://www.ebay.com/itm/355772584472?f ... R7qk5I_-Yw

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PostPosted: June 7, 2024, 8:51 am 
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No, the Ranger 02-11. Can be smoothed with a carbide rotary file in a drill to look like a header.

https://www.ebay.com/itm/285847024067?f ... R_zM7qv-Yw

_________________
Miata UBJ: ES-2074R('70s maz pickup)
Ford IFS viewtopic.php?f=5&t=13225&p=134742
Simple Spring select viewtopic.php?f=5&t=11815
LxWxHt
360LA 442E: 134.5x46x15
Lotus7:115x39x7.25
Tiger Avon:114x40x13.3-12.6
Champion/Book:114x42x11
Gibbs/Haynes:122x42x14
VoDou:113x44x14
McSorley 442:122x46x14
Collins 241:127x46x12


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PostPosted: June 12, 2024, 11:18 am 
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Location: San Dimas, CA
What you guys use for the ignition system, Focus coils and wires or smart coils(3 prong) on plugs?
I'm planning to use a Speeduino, and I'm not sure which way should I go?

Also, anybody has a proven cooling system schematic with integrated heater?
Concerns: where in the cooling system to connect the expansion tank, this tank should have one hose running to it, or it should have an in and out hose?
Found this pdf, what you guys think it should work correctly?


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'20 Alfa Romeo Stelvio daily
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