Throttle body options for port fuel injection

[Urgefor]

I was reviewing options for a throttle body in relation to converting to port injection.  The question I was left with is if there are any performance related advantages or disadvantages to using an EFI throttle body intake elbow along with an EFI throttle body versus a 4BBL throttle body on the EFI intake manifold.  Any insight is appreciated.

[jayb]

The Holley throttle bodies are nice because they include the TPS and IAC, and I think they also have the ATS if I recall correctly.  Plus they bolt onto an intake with a 4150 flange. 

https://www.summitracing.com/parts/hly-112-588

[Urgefor]

I agree the Holley throttle body is a nice all in one package.  The elbow I linked in my initial post also bolts onto a 4150 flange.  TPS, IAC and ATS aside, I was curious if anyone has compared the elbow and 90mm throttle body versus the 4bbl throttle body from a performance/flow perspective.  I assume if the intake was ported to even out flow between the runners, the elbow would need to be installed while flow testing?  I think the elbow/tb combo would help with hood clearance.  It does seem like the overall cost of elbow/tb would be a bit more than the 4bbl throttle body though when taking into account TPS, IAC and ATS.

[pbf777]

     The EFI (those which incorporate fuel delivery) throttle bodies which mount directly to the intake manifold replacing the carburetor pretty much accomplish just that, as far as the air flow function is concerned. Aka. it is what it is, it is as it was.   

     Whereas the mono-valve & dual-throat throttle bodies intended for EFI applications with sequential (including bank-fire) port injection, those which often are witnessed with the companion 90 degree elbow, mounted in place of the carburetor, do often present a realization of the issues with both intake manifolds' air distribution characteristics, and then as aided by the elbow installation, inflict biases in air distributions within the manifolds' plenum and inlet port throats often leading to further complicate matters.     
 
     Scott. 

[Urgefor]

This is in relation to port injection.  I updated the subject to help avoid any potential confusion.

[My427stang]

It comes down to volume and packaging. If 4x round holes do not have the area, a single bigger one may, area grows quickly with a single butterfly in large diameter.

For stockers, most factory manifolds work a very large plenum in order to run longer runners within that plenum, those longer runners are good for torque, but also smooth the flow entering a port, all the big open TB has to do is let in air, so a big single is easy

In the case of a standard FE intake, unless the 4150 or Dommy cannot flow enough, the standard throttle body will be a better match to all 8 cylinders

[Urgefor]

In the case of a standard FE intake, unless the 4150 or Dommy cannot flow enough, the standard throttle body will be a better match to all 8 cylinders

95% sure that the end game intake will be the Edelbrock Victor Ford FE EFI Intake Manifold.  I'm leaving that last 5% to be open minded about other options.   

[My427stang]

In the case of a standard FE intake, unless the 4150 or Dommy cannot flow enough, the standard throttle body will be a better match to all 8 cylinders

95% sure that the end game intake will be the Edelbrock Victor Ford FE EFI Intake Manifold.  I'm leaving that last 5% to be open minded about other options.   

The only benefit I would see with an elbow off the Victor and a TB elsewhere, is the ability to set up a cold air intake, but then you add throttle cable changes, etc. 

[Barry_R]

I can tell from testing that a large single blade throttle body (flying toilet..) made more power than a 4500 throttle body on a Victor EFI intake of roughly 700 HP.  I can also tell you that that single blade throttle body was nearly undriveable on the street, where the 4500 was fairly pleasant and remains on the car today.

[pbf777]

I can also tell you that that single blade throttle body was nearly undriveable on the street, where the 4500 was fairly pleasant and remains on the car today.

     Not the only issue but, the large single blade mounted directly above the manifolds' plenum becomes an effective air diverter under part throttle angles and often results in horrendous air distribution in the intake manifold.   

     Scott.

[Joe-JDC]

To be honest, the elbow should only be used for supercharger applications.  I agree with the statement that the throttle blade angle at part throttle skews the air flow distribution.  If it had been a simple solution, then Ford would not have gone to the trouble of creating those upper plenum with the 180* airflow change.  Joe-JDC

[JamesonRacing]

Holley throttle body on Edelbrock Victor EFI, 48lb injectors