Boosted fuel pressure regulator questions

92Rustang · Jul 13, 2024

I just acquired a vortech supercharger for my five liter. (6 psi pulley) I plan on using 42lb inj w/ maf and a 255 pump.. what do I do about the factory fuel pressure regulator? Can I use it? Do I need to upgrade it? Do I leave the vacuum/boost reference to it? I'm not trying to break any world records just want safe reliable fun. I do not have an FMU.

Also, do I NEED a custom dyno tune to run it safely?

Essn95 · Jul 13, 2024

Factory fuel pressure regulator will work perfectly. Make sure you get a good tune of course as well. I put a tee into that hose to run to my AEM boost gauge

Noobz347 · Jul 13, 2024

I can guarantee that you're going to need a tune with the 42s no matter how good the MAF is.

92Rustang · Jul 13, 2024

Noobz347 said:
I can guarantee that you're going to need a tune with the 42s no matter how good the MAF is.

A dyno tune is definitely on the to do list i know its beneficial in many ways. Just wonder if I can get by for maybe a year or something without a custom dyno tune.. if I have enough fuel.

92Rustang · Jul 13, 2024

Essn95 said:
Factory fuel pressure regulator will work perfectly. Make sure you get a good tune of course as well. I put a tee into that hose to run to my AEM boost gauge

Can you educate me on why a fuel pressure regulator that is designed to increase fuel pressure when the diaphragm has vacuum applied to it work when it is supplied boost to the same diaphragm?

Noobz347 · Jul 13, 2024

92Rustang said:
A dyno tune is definitely on the to do list i know its beneficial in many ways. Just wonder if I can get by for maybe a year or something without a custom dyno tune.. if I have enough fuel.

Lemme put it to you gently.... No.

Slow moving manners are going to suck and any kind of throttle is going to be rich.

Personally, I wouldn't drive it from the shop the house that way... again.

92Rustang · Jul 13, 2024

Noobz347 said:
Lemme put it to you gently.... No.

Slow moving manners are going to suck and any kind of throttle is going to be rich.

Personally, I wouldn't drive it from the shop the house that way... again.

Ok I will make it priority. What about the fpr?

Noobz347 · Jul 13, 2024

92Rustang said:
Ok I will make it priority. What about the fpr?

I still run my stock FPR to this day.

TOOLOW91 · Jul 14, 2024

Aeromotive or a kirban regulator . Get the thing tuned

Blown88GT · Jul 14, 2024

Back in the day, the Vortech kit came with an FMU to increase the fuel pressure under boost. It was installed in the fuel return line & referenced the manifold vacuum/boost, progressively cutting off the return line which would increase the fuel pressure.

No one will be able to dyno tune a stock EEC-IV. You will need an FMU or an aftermarket ECU.

Noobz347 · Jul 14, 2024

Try these guys:

Prime Speed

Massachusetts auto tuning and performance services from Prime Speed Tuning, Inc in Danvers, MA

primespeedtuning.com

Dunno how close/far you might be.

Cheapskate207 · Jul 14, 2024

Pete at performance dyno in Loudon, NH is the go to guy in the north east for dyno tuning foxbodies.

I run a similar setup as you and he tuned it perfectly with a Moates quarterhorse.

92Rustang · Jul 15, 2024

Blown88GT said:
Back in the day, the Vortech kit came with an FMU to increase the fuel pressure under boost. It was installed in the fuel return line & referenced the manifold vacuum/boost, progressively cutting off the return line which would increase the fuel pressure.

No one will be able to dyno tune a stock EEC-IV. You will need an FMU or an aftermarket ECU

A mustang dyno shop can't tune a factory ecu?

Cheapskate207 · Jul 15, 2024

Ofcourse they can. I think he means they’re just getting hard to find. Tuning the eec4 is a dying art.

AeroCoupe · Jul 15, 2024

Technically you cannot tune the ECU so you have to use a chip that piggy backs on the service port of the ECU. If you go this way I would go with SCT but that is because I have ran one for about 20 years. If you really want to be able to tune the car then ditch the stock ECU and go aftermarket. Pricey but you are dealing with a 30 plus year old computer that is basically on the spectrum compared to today's ECU's.

General karthief · Jul 15, 2024

AeroCoupe said:
Technically you cannot tune the ECU so you have to use a chip that piggy backs on the service port of the ECU. If you go this way I would go with SCT but that is because I have ran one for about 20 years. If you really want to be able to tune the car then ditch the stock ECU and go aftermarket. Pricey but you are dealing with a 30

Yeah, archaic compared to newer stuff, very narrow parameters to work with, even chips are limited.
If you're handy with a computer, and I am not, the aftermarket computer system is the way to go.

Noobz347 · Jul 15, 2024

General karthief said:
Yeah, archaic compared to newer stuff, very narrow parameters to work with, even chips are limited.
If you're handy with a computer, and I am not, the aftermarket computer system is the way to go.

92Rustang · Jul 16, 2024

AeroCoupe said:
Technically you cannot tune the ECU so you have to use a chip that piggy backs on the service port of the ECU. If you go this way I would go with SCT but that is because I have ran one for about 20 years. If you really want to be able to tune the car then ditch the stock ECU and go aftermarket. Pricey but you are dealing with a 30 plus year old computer that is basically on the spectrum compared to today's ECU's.

Yes guess I'll be trying to find a shop then still utilizes a sct elimination chip. Dez racing does but won't tune it since they didn't to the s/c install.. haven't heard back from Pete in Loudon after calling and emailing. Looking like Chris at MPE racing will have to do it. Quoted $750.

AeroCoupe · Jul 16, 2024

Is the $750 with the SCT chip? Would hope so but was curious. Hopefully its a switch chip and you can have him put an emissions tune (if tested), street tune, and an all out tune for the track.

Ask if they have a tech sheet you need to fill out, make sure the tune up is fresh (cap, rotor, plugs, etc.), and put a fresh tank of good gas in it. I would ask about base timing, spark plug gap, etc. The more you do ahead of time the less time he will have to spend turning wrenches which means less time on the dyno.

92Rustang · Jul 19, 2024

AeroCoupe said:
Is the $750 with the SCT chip? Would hope so but was curious. Hopefully its a switch chip and you can have him put an emissions tune (if tested), street tune, and an all out tune for the track.

Ask if they have a tech sheet you need to fill out, make sure the tune up is fresh (cap, rotor, plugs, etc.), and put a fresh tank of good gas in it. I would ask about base timing, spark plug gap, etc. The more you do ahead of time the less time he will have to spend turning wrenches which means less time on the dyno.

Yes $750 with the hardware, labor and dyno/tune time.

Speaking of spark plug gap what should I be running ??

Boosted fuel pressure regulator questions

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Stangnet Facilities Maint Tech... Er... Janitor

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If you're the village idiot what's that make me?

Stangnet Facilities Maint Tech... Er... Janitor

The left one hangs a little lower

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The left one hangs a little lower

lube between the nut and the face. I know my lubes

wonder how much it would cost to ship you a pair

Stangnet Facilities Maint Tech... Er... Janitor

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lube between the nut and the face. I know my lubes

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