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Old September 16th, 2009, 03:03 PM   #1
Justin@VMP
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Default GT500 High-Flow Inlet Elbow Plenums designed in CFD from VMP...

The long awaited high flow inlet elbows are now in stock at VMP. This is a totally re-engineered replacement elbow that flows more air but has the fit and finish of a stock piece.



Gains of 20-40HP are possible depending on your boost level and TB combination.

I was the first to make over 700 rear wheel with a TVS (real SAE corrected Dynojet numbers), and I am always looking for ways to take it further.

With all the dyno testing that I have done with GT500s and TVSs, modifying the inlet elbow was a no-brainer, as it was the next restriction in the system after the throttle body. Testing that I did years ago showed no power difference between 65, 66, 67, and monoblade throttle bodies, indicating the restriction lay elsewhere.

Part of any good R&D program involves a multifaceted approach. I looked at the issue from a variety of angles, and tried a lot of different things, some of you may remember my posts earlier in the year about cutting and welding on blower parts. Of course this was for R&D purposes only, the finished product requires no such heavy modification.



Welding to the floor of the stock inlet elbow and dropping the floor is one approach that can lead to a lot more airflow and HP, but it is time consuming and may hinder the use of aftermarket fuel rails or aftermarket injectors. We also took the approach of computer modeling the elbow in CAD for maximum flow.

I ended up dyno testing the hand modified and welded stock elbow that was a lot larger vs a computer modeled elbow that optimized the turn into the blower.



Dyno testing showed better gains with the smaller elbow that was modeled in CFD, compared to the large hogged out elbow. This goes to show, the old school approach of just making it bigger, is no match for modern R&D using Computational Fluid Dynamics.

Our elbow is designed to optimize the turn and airflow into the blower, by keeping airflow laminar and normalizing airspeed throughout the elbow, more flow can be achieved with CFD analysis than by just "hogging it out".

The other benefit, is this computer optimized design flows a ton of air, but is not so large that it has clearance problems with fuel rails and does not require major hogging out of the blower inlet.

The innovative D-port design of our elbow will only require a small amount of material removal at the top and bottom of the inside corners, about a 1/4"-3/8" worth of material removal in the corners is required, which takes the stock or TVS blower opening from an oval to a D shape.



The stock and TVS blowers both have the exact same size opening, but the floor is totally open in the TVS blower, as soon as the air comes out of the elbow it drops off into a larger cavity. Though not required, if you wanted to make every last HP with our elbow, there has been extra material cast into the floor of the elbow so you can port it out up to 1/2" lower if you so desire.

Opening up the tiny oval hole in the stock and tvs blowers is essential to getting more air into the blower and making maximum power, it would be nice if we could skip this step, but it is required to see more than just a few HP gain. Most people can do this at home if they take their time and use a dremel with a good bit or a carbide burr from harbor freight. A file will even work if you are a very patient person.

http://www.vmptuning.com/store/index...334&parent=103

Key Features:
- Developed in the same CAD system Ford Motor Co. uses to design OE components
- Inlet geometry optimized with Computational Fluid Dynamics, extensive flow work, real world dyno testing and analysis
- Patent pending D-port design
- Factory fit and finish
- O-ring grooves makes installation easier, no RTV needed
- Requires minimal porting to supercharger housing to obtain maximum flow potential
- Black OEM powdercoat available and shipping now
- Polished Elbows available, contact us
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Justin Starkey - VMP Tuning - Ford & GM Tuning
Mobile DynoJet 224xLC Load Control
Justin@VMPTuning.com 321-206-9369

2007 Shelby GT500 Ford Racing TVS Blower, VMP 2.6" Pulley, IW 10% OD lower, TB, 697RWHP/702RWTQ
2006 F250 6.0 14.3@93
2000 Mustang 3.8 A4 TT 450RWHP@17psi & 10.9@127.8 1.74 60ft@17psi stock motor
2006 Mustang 4.0 M5 Vortech 15psi 395RWHP 12.5@110 wife's car

Last edited by Justin@VMP : September 17th, 2009 at 05:45 PM.
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Old October 30th, 2009, 10:08 AM   #2
Justin@VMP
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Join Date: Jul 2005
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Default

This high-flow inlet elbow helped Ted get his TVS car into the 9 sec zone:
http://www.svtperformance.com/forums...omplished.html
__________________
Justin Starkey - VMP Tuning - Ford & GM Tuning
Mobile DynoJet 224xLC Load Control
Justin@VMPTuning.com 321-206-9369

2007 Shelby GT500 Ford Racing TVS Blower, VMP 2.6" Pulley, IW 10% OD lower, TB, 697RWHP/702RWTQ
2006 F250 6.0 14.3@93
2000 Mustang 3.8 A4 TT 450RWHP@17psi & 10.9@127.8 1.74 60ft@17psi stock motor
2006 Mustang 4.0 M5 Vortech 15psi 395RWHP 12.5@110 wife's car
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