Carb Swap
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5th Gear
Joined: Nov 2023
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Carb Swap
Hey there I'm looking to switching to a holley double pumper blow through for simplicity of tuning for the 1/4 mile. I'm wondering if anyone has carb swapped one of our trucks and if so what kind of issues did you run into. I'm planning on running a 14psi return/ bypass style regulator. Any input is appreciated. Truck is a 1990 F150 5.0
Hotshot
Joined: Jul 2020
Posts: 10,548
Likes: 2,668
From: Near Salt Lake City
I have researched this subject for a future build of mine (after I get the 427 installed in my 68 Camaro)
Look at annular nozzle blow through carburetors (I would stick with vacuum secondaries) (Holley) and a single pumper (maybe 50cc)
You need those annular nozzles and the correct regulator that will change with your boost pressure
Sounds like you have that regulator
Should run like a raped ape
Good luck
Look at annular nozzle blow through carburetors (I would stick with vacuum secondaries) (Holley) and a single pumper (maybe 50cc)
You need those annular nozzles and the correct regulator that will change with your boost pressure
Sounds like you have that regulator
Should run like a raped ape
Good luck
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5th Gear
Joined: Nov 2023
Posts: 5
Likes: 0
thanks for the advise I'll definitely look into a carb with annular nozzles, do you know if they just sell the nozzles alone. As for the fuel pressure regulatator I have a boost refrence once that I found thinking I'm goin to run base fuel pressure plus boost pressure for my actual fuel pressure.
Logistics Pro
Joined: Aug 2010
Posts: 3,718
Likes: 586
From: Chillicothe
As someone whom has done a 1000hp blow-thru turbo setup... you will be miles ahead staying fuel injected.
Get the Stinger PiMP computer, 80 lb injectors and bigger pump. Stick in a wide band O2 and tune to your hearts content. Tapping a keyboard is far easier than fighting a carb.
Only reason I did a carb setup when turboing was because it was 2007 and there wasn't "easy" access to all the stuff we have today.
Let's look at stuff needed for a carb swap.
1. Carb
2. Manifold
3. Distributor
4. Wiring to new distributor
5. Bigger External fuel pump
6. Wiring to control fuel pump
7. Wide band for tuning
8. Selection of jets for carb tuning
9. Selection of weights and springs for distributor tuning.
10. Boost regulated fuel pressure regulator.
11. Different linkage for pedal to carb
12. Depending on what transmission you have, Different trans or an aftermarket controller.
Stuff to stay injected.
1. Stinger ecm with or without transmission control
2. Bigger injectors
3. Bigger pump
4. Wideband o2
5. Boost referenced fuel pressure regulator.
Now things you dont "need" But should have.
Intercooler
Electric fans on intercooler.
QUALITY posi unit
Get the Stinger PiMP computer, 80 lb injectors and bigger pump. Stick in a wide band O2 and tune to your hearts content. Tapping a keyboard is far easier than fighting a carb.
Only reason I did a carb setup when turboing was because it was 2007 and there wasn't "easy" access to all the stuff we have today.
Let's look at stuff needed for a carb swap.
1. Carb
2. Manifold
3. Distributor
4. Wiring to new distributor
5. Bigger External fuel pump
6. Wiring to control fuel pump
7. Wide band for tuning
8. Selection of jets for carb tuning
9. Selection of weights and springs for distributor tuning.
10. Boost regulated fuel pressure regulator.
11. Different linkage for pedal to carb
12. Depending on what transmission you have, Different trans or an aftermarket controller.
Stuff to stay injected.
1. Stinger ecm with or without transmission control
2. Bigger injectors
3. Bigger pump
4. Wideband o2
5. Boost referenced fuel pressure regulator.
Now things you dont "need" But should have.
Intercooler
Electric fans on intercooler.
QUALITY posi unit
Hotshot
Joined: Jul 2020
Posts: 10,548
Likes: 2,668
From: Near Salt Lake City
I prefer nostalgia at times
The fuelie setup sounds expensive
How far are you going after the bombs fly?
One EMP burst and all the fuel will be for us carbureted folks
My advice
Buy a points distributor and learn to set dwell
I have a love hate relationship with Holley carbs and enjoy fixing them and their rivals
Injection is for daily drivers that require no think
I know a guy with a similar setup as you describe Mudsport96
Dual injectors, alcohol, twin turbos, 460 in a 1/4 mile race truck
He has been fighting the tune for a couple of years now
To each his own,
I'd just rather play with a carb than fight a tune in some cases
I fight the fuel injected 2023s and Raptor turbo lines, emissions noncompliance, things like that
The fuelie setup sounds expensive
How far are you going after the bombs fly?
One EMP burst and all the fuel will be for us carbureted folks
My advice
Buy a points distributor and learn to set dwell
I have a love hate relationship with Holley carbs and enjoy fixing them and their rivals
Injection is for daily drivers that require no think
I know a guy with a similar setup as you describe Mudsport96
Dual injectors, alcohol, twin turbos, 460 in a 1/4 mile race truck
He has been fighting the tune for a couple of years now
To each his own,
I'd just rather play with a carb than fight a tune in some cases
I fight the fuel injected 2023s and Raptor turbo lines, emissions noncompliance, things like that
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pro70golfer14
1987 - 1996 F150 & Larger F-Series Trucks
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Jul 15, 2010 12:08 AM
