I need some outside of the box thinking here. :)

I am building a low compression 540" motor with Brodix BB2X rectangle port heads. Camshaft will be a hydrualic roller around 300 degrees total (split) duration. It will have forced induction by way of two 75mm turbo chargers. Hoping to not spin past 7,000 RPM. Car will be street driven. Transmission is a 4L80e.

I want a clean looking EFI manifold setup, and I do not like the big/huge/long tunnel ram deals. So I want to put on a stock looking manifold and then use a 90 degree throttle body elbow.

http://www.edelbrock.com/automotive_new/mc/efi/efi_chevy.shtml

I am leaning towards the: VICTOR JR. 454-R EFI (Up to 7500 rpm)
The big victor seems too "racey" for my application. I will race the car, but I'm sure the boost can overide any disavantages of the smaller victor Jr.

Thoughts?

FAST sells one here:
http://www.compperformancegroupstores.com/store/merchant.mvc?Store_Code=FS&Screen=PROD&Product_Code=3011454

Holley here:
http://www.holley.com/types/Chevrolet%20Big%20Block%20-%20EFI.asp

Examples of intake elbows here:
http://www.intakeelbows.com/

I want a single blad TB because the 4 blades can leak either at the carb-hat or at the throttle blades.

Thanks for any an all thoughts!! :)

Beauty is in the eye of the beholder.

With blowers you can put just about anything on there and get air through it.

When I look at an intake I see the air flow potential so I find square corners or edges horrid. I prefer to see graceful bends. I rather like to see long seperate runners as well. The LS series intakes are what I consider a beautiful manifold.

But then I am a NA kinda guy.

I guess my thinking, which may be off target, would be to optimize the intake around the lower end of the scale to maintain some mid-range torque and let the turbos take care of the top end breathing. So I would probably be looking more at a dual plane.

How much leakage do you really think matters when you have 1000++++ CFM going through the engine? Just food for thought there on the throttle body.

With a 540 and small twins, I think a lack of power at any RPM will be the least of your problems no matter what the intake.

How much leakage do you really think matters when you have 1000++++ CFM going through the engine? Just food for thought there on the throttle body.

With a 540 and small twins, I think a lack of power at any RPM will be the least of your problems no matter what the intake.


I have no idea how much leakage I would have. I talked with the folks at FAST (becuase I have a FAST ECU already) and they said the 4 barrel setup would not be so hot for my setup and that I should look at a large single TB with an angle elbow. doug, can you recomend a 4 barrel TB that I should look at? I am building the motor from the ground up and what sits on top of the intake is a big fat unknown right now. I'd really apreciate the insite as this is my first EFI build from scratch. What CFM should I try to get? I'd like to error on the small side, again, for off idle response.

Holley's intake should pretty much compare to the victor jr, but their website did not have near the detail that E'brocks did. Can you talk me in the holley? :)


I am wanting an off the shelf EFI manifold, and I'm pretty sure they do not make a dual plain EFI manifold. I know I can have one altered, but every freaking thing on this car is custom, so it'd be nice to not have to hassle with that. I can just get the fuel rail kit and be done.

So, Victor jr. is it then? :)

I use the Victor EFI intake on my 350 EFI engine. A singleplane intake with multi-port EFI is perfectly acceptable even N/A let alone boost. They don't make a dual plane EFI intake because it's not necessary. Fuel is being delivered almost at the head rather than at the top of the intake.

I'd use as much as I could stuff under whatever I had for a hood.

On a N/A combo there is 25HP between a professionally ported Vic jr and a CNC Victor 454R and a little more with a CNC Super Victor. The Super Victor doesn't make a lot more power (talking 825-875 HP pump gas range)..but it hangs on a LOT better after peak power. As RPM rises it can be 20+ better. So in my mind that indicates where they airflow restriction will be as you add boost. It's going to back up more in the smaller intake and just show artificial boost. Will it run killer? Sure.....but I think more intake is a good idea on a boosted 540. No use leaving power on the table if you are buying parts.

Holley's EFI intake is working well on mine and did very well against a ported Super Victor on my 555" during some recent dyno testing.


JIM

I have no idea how much leakage I would have. I talked with the folks at FAST (becuase I have a FAST ECU already) and they said the 4 barrel setup would not be so hot for my setup and that I should look at a large single TB with an angle elbow. doug, can you recomend a 4 barrel TB that I should look at? I am building the motor from the ground up and what sits on top of the intake is a big fat unknown right now. I'd really apreciate the insite as this is my first EFI build from scratch. What CFM should I try to get? I'd like to error on the small side, again, for off idle response.

Holley's intake should pretty much compare to the victor jr, but their website did not have near the detail that E'brocks did. Can you talk me in the holley? :)


I am wanting an off the shelf EFI manifold, and I'm pretty sure they do not make a dual plain EFI manifold. I know I can have one altered, but every freaking thing on this car is custom, so it'd be nice to not have to hassle with that. I can just get the fuel rail kit and be done.

So, Victor jr. is it then? :)

I'll comment on one thing Mike. Not sure what you mean by "off idle response". With EFI, the more airflow you have per degree of throttle opening, the more response you will have. It is an opposite problem than with a carb. If you have a throtttle body with a straight bore, you may have "too much throttle response" and the car will be "jerky" off idle. Not lean, just too much airflow.

What you want is something that packages the the best and a throttle body/elbow that has the best air entry/distribution. Power would be the least of my concerns with what you are building. Talk/look at what the EFI turbo guys are running. Not all elbows are as good as others. Some have directions vanes and better distribution. I'm not an expert there from personal use, just now what I'd look for. The Holley MPFI intake would be very good for you. The Ebrocks would be fine too.

I'm just trying to offer input in the first paragraph so you have your thought process in the right direction.

I think I read it on the internet that a large single TB is more difficult to tune for lower throttle openings, but in comparison the 4 barrel setup not only can leak at the 4 throttle blade openings, but at the carb hat ring and carb hat screw.

So if I go with the bigger intake, I should be ok, but only because I am using EFI. if I do that I must decide now on what throttle body setup to use because that dominator opening is huge.

This is what I was referring to as a third option:

http://www.gmperformanceparts.com/_res/i/parts/collection/06_ENGB_BIGB_RAMJ_01.jpg

Holley has a 2000 cfm 4 barrel throttle body to match their efi dominator manifold. What are your plans for hood clearance?
Squido :yes:

I have a stock style SS hood. metal.

Accufab and FAST have a low profile version. I have found a lower profile, 4500 flange, 4 barrel throttle body used for a godo price. But I think I need to stick with teh 4150 sizing. After a few years, I will not want 1000+HP. So on down the road some, it'd be nice to have a 500-700HP big block and for that I'd use the 4150 setup again.