Engine Explorer GT40 Intake & Heads

I

Iceman1998

Member

Mar 15, 2021

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Ontario, Canada

Mar 14, 2024

#1

• Mar 14, 2024

• #1

Hey everyone. I have a question for you all. I'm in the process of installing an '96 explorer GT40 upper & Lower & 3 bar iron heads with roller rockers, 70mm TB, 19# EV6 injectors and stock cam on my '88 speed density 5.0.

I've read in a few places that i will need to increase the fuel pressure with this combo. Does anyone have any experience running this set up? Did you need to increase fuel pressure? If so to what pressure?

Any other things that I may need to change/ adjust with this new set up?

Thanks in advance

 

nickyb

I gotta say i never painted my nuts, Never Ever

15 Year Member

Apr 3, 2009

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nevada

Mar 14, 2024

#2

• Mar 14, 2024

• #2

Id run the same fuel pressure.

 

Reactions: KRUISR and Noobz347

Noobz347

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

Admin Dude

Jan 4, 1985

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Mar 14, 2024

#3

• Mar 14, 2024

• #3

It's not a horrible idea to have an adjustable regulator installed in your circumstance however...

It's an even better idea to upgrade the fuel pump (if you're still running stock) and ensure a steady power supply. So long as your fuel system [volume] is up to snuff, stock fuel pressures will be perfect.

 

Reactions: slow84lx and KRUISR

8

86HO5.0

Active Member

Apr 18, 2023

241

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Raleigh, NC

Mar 16, 2024

#4

• Mar 16, 2024

• #4

Stock fuel pressure will be fine with that setup as will the Expo injectors, x2 on the fuel pump upgrade.

From my experience, the 70mm TB on that combo creates a transitional lean spot that the stock ECU cannot adapt to. At approx 50-65% throttle under load the AFR would hit 17.5-18.1 range. AFR at WOT, idle, coast, etc was all perfect. The lean spot and high injector DC is what prompted the swap to a PimpXS ECU.

 

8

86HO5.0

Active Member

Apr 18, 2023

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Raleigh, NC

Mar 16, 2024

#5

• Mar 16, 2024

• #5

I'd also recommend buying a good wideband.

 

G

GOvert

15 Year Member

Jan 27, 2007

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north central Tennessee Valley

Mar 16, 2024

#6

• Mar 16, 2024

• #6

What ECU are you using? Are you using these 24 lb purples or something larger?

 

8

86HO5.0

Active Member

Apr 18, 2023

241

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Raleigh, NC

Mar 16, 2024

#7

• Mar 16, 2024

• #7

Running 30lb injectors, 190lph pump and PimpXS ECU. Pump and injectors are overkill but it leaves room for upgrades. Didn't want to buy injectors twice.