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Old 10-07-2019, 08:31 PM   #1
Super_Dave
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Edelbrock ProFlo 4 XT

I am going to be adding the Edelbrock ProFlo 4 XT Sequential Direct Port EFI System to the 355 small block on my project build.

After spending an inordinate amount of time looking over all the available systems, and see a lot of consistent "patterns" I have decided the Edelbrock is the right choice for me.

It comes with everything I will need and the Edelbrock Universal Sump will allow me to use my stock mechanical pump and Blazer rear mounted gas tank.

Being a noob to EFI, I have a quick question. The ProFlo 4 XT comes with an O2 sensor and I know where to install it. However, when I was talking to my exhaust guy about welding it to my new dual exhaust, he asked if I was only installing one.

Is there an advantage to having two O2 Sensors? I would call Edelbrock, but they are closed at the moment, but I would assume that they would offer the kit with two O2's if it was beneficial. . . but what do I know; I'm a noob.

I got some feedback that using two, puts one in the front and one in the back on the same side. . . not one on each side. Putting one on each side seems to tickle my noob common sense.

Anyway, I am all ears.
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Old 10-07-2019, 08:43 PM   #2
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Re: Edelbrock ProFlo 4 XT

Go over to the edelbrock forum. There's a pro flo 4 section. The moderator there is Nate. He is super about answering questions. I posted my fair share.
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Old 10-07-2019, 09:29 PM   #3
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Re: Edelbrock ProFlo 4 XT

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Originally Posted by Rickysnickers View Post
Go over to the edelbrock forum. There's a pro flo 4 section. The moderator there is Nate. He is super about answering questions. I posted my fair share.
I have tried numerous times to register and I still don't have an account.

I will try again. . . might get lucky.

Thanks for the input!
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Old 10-08-2019, 06:41 AM   #4
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Re: Edelbrock ProFlo 4 XT

Quote:
Is there an advantage to having two O2 Sensors?
None really. Oh, maybe a diagnostic tool is the engine isn't running well.

The job of the O2 in an oem application is to keep the catalytic converter happy. if you have right and left cats then dual o2 is more important.

I have port fuel on my truck and am only running one o2 sensor
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Old 10-08-2019, 06:46 AM   #5
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Re: Edelbrock ProFlo 4 XT

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Originally Posted by Bigdav160 View Post
None really. Oh, maybe a diagnostic tool is the engine isn't running well.

The job of the O2 in an oem application is to keep the catalytic converter happy. if you have right and left cats then dual o2 is more important.

I have port fuel on my truck and am only running one o2 sensor
The 355 is tight, and runs great when the Edelbrock carb wants to cooperate - hence the ProFlo swap.

No cats, just long tube ceramic headers and some Flowmasters.

Sticking with the single o2 sounds best.

Thanks for the input!
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Old 10-08-2019, 06:51 AM   #6
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Re: Edelbrock ProFlo 4 XT

Quote:
Originally Posted by Rickysnickers View Post
Go over to the edelbrock forum. There's a pro flo 4 section. The moderator there is Nate. He is super about answering questions. I posted my fair share.
I remembered why I haven't spent time on the Edelbrock Forum.

When I registered 6 weeks ago, they sent me an email wanting my parents to sign a permission slip so I could participate on a limited basis.

The problem is, I am 65 and both parents are deceased. I have contacted Edelbrock a couple of times and get no response.

Seems their registration program replaced my birthday with the registration date. . . and I can't get anyone to correct it.

Maybe Vic will vouch for me. . .
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Old 10-08-2019, 10:25 AM   #7
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Re: Edelbrock ProFlo 4 XT

That's odd. I didn't have any problems getting signed up/in.
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Old 10-08-2019, 01:30 PM   #8
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Re: Edelbrock ProFlo 4 XT

O2's adjust the fuel and give the computer feedback on running condition. If you have dual exhaust and only one sensor both banks will be adjusted to how one side is running. Dual sensors just means better input.
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Old 10-08-2019, 01:43 PM   #9
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Re: Edelbrock ProFlo 4 XT

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O2's adjust the fuel and give the computer feedback on running condition. If you have dual exhaust and only one sensor both banks will be adjusted to how one side is running. Dual sensors just means better input.
What if you installed 1 sensor in the H-pipe? I'm considering this same system and wondered the same thing.
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Old 10-08-2019, 02:25 PM   #10
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Re: Edelbrock ProFlo 4 XT

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What if you installed 1 sensor in the H-pipe? I'm considering this same system and wondered the same thing.
From what little I have been told over the months, the sensor needs to be 6" or so from the collector on the headers.

Here is a good video:
https://www.youtube.com/watch?v=lyv0wh3fsLM
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Old 10-08-2019, 02:41 PM   #11
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Re: Edelbrock ProFlo 4 XT

Thanks S_D, that is a big help. Since my H-pipe is 3' behind the collectors that
idea won't work.
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Old 10-08-2019, 05:45 PM   #12
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Re: Edelbrock ProFlo 4 XT

Sorry to highjack young fella.
I got a question.
You post that you can use your stock mechanical pump. How?
It can only produce 10% of your needed pressure.
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Old 10-08-2019, 05:49 PM   #13
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Re: Edelbrock ProFlo 4 XT

Does the sump have a pump?
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Old 10-08-2019, 05:57 PM   #14
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Re: Edelbrock ProFlo 4 XT

the tech is good on the edelbrock forum . same user name for me there .

the holley forum was a joke unless you just searched and took for ever to get signed up active .

the sensor for o2 is required just 1 as the intake is a single plane so all get the same air and if the average is reading good the rest should be good .

i have my edelbrock pro flo 4 on a L31 vortec and doing great with the 4150 setup . my o2 is in the factory exhaust manifold location the old tbi setup used and works great there no problems so far .

a fuel sump is feed fuel via the old low psi pump and this fills the sump and the electric pump inside is pulse with modulated to feed the required fuel needs for the efi system .
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Old 10-08-2019, 07:28 PM   #15
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Re: Edelbrock ProFlo 4 XT

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Originally Posted by geezer#99 View Post
Sorry to highjack young fella.
I got a question.
You post that you can use your stock mechanical pump. How?
It can only produce 10% of your needed pressure.
It fills the Universal Fuel Sump which has it's own high pressure pump for the injectors. Saves having to swap out the fuel tank and run new lines. Fro everything I have learned, it works waaaaay better than the FiTech Command Center.
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