What a 4.0 Whipple needs for Throttle bodies for maximum performance IE 1400hp


B.M.F.

GT Owner
Mark II Lifetime
Jan 29, 2009
1,844
Minnesota
I know that this is a Kenne bell 3.6 liquid cooled blower, But this gives you an idea of what is needed to make 1400 hp with a twin screw blower on a 5.4 Ford Gt motor.
This motor is 12 to 1 compression and will make around 26lbs of boost.

Those are twin 105mm throttle bodies. If I was to ever do a 4.0liter on a gt I was gong to order it with out the cnc'd part that says Ford GT and I was going to make something real simular to this. This is a motor that John @ accufab built and the same motor that was in Danny Thompson's Land speed Mustang that barrel rolled @ 266 last year. The motor in Dannys car was less compression and only made 18lbs of boost and it made 1200fwhp. Can you imagine a ford gt with a blower making 1000rwhp with only 18lbs of boost. Also this motor did that on e85 fuel. John dyno'd back to back on c16 and e85 and made exactly the same power and a little more torque with e85 and less timing.
A person could also use the same kenne bell blower here if you had plates made and the liguid cooled seams to help keep inlet temps down.

I think that most here are finally figuring out with the whipples that the stock air box is complete is a waste of time. Like someone said " HOT AIR IS BETTER THAN NO AIR"
Which i agree once you get moving there is enough air in the engine compartment that the temp of the air is not a big deal if you were to have a big style open filter.

Here is a dyno sheet of a 2010 gt500 with a 4.0 dyno'd in 90degree weather. 30lbs of boost on the hit and 28 at the end of the pull, 8.8 to 1 compression and on e85. Motor is nothing special beside good rods and pistons, alittle head work and some cams. It made the same power with 4 less lbs of boost in colder weather. Some compression in this motor would easily do another 100-150hp. But your going to need a good xtra fuel pump to do this in a gt and twin 80 or 100lb injectors, depending on gas or e85.
Needless to say with the power curve of this car and put that in a GT and a t.t car better be packing a bigger lunch:thumbsup..

Enjoy
 

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What would be the price difference between this water cooled KB with throttle bodies and intake compared to the cost of the 4.0?
 
:pop
 
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What would be the price difference between this water cooled KB with throttle bodies and intake compared to the cost of the 4.0?

Depends. A person would have to machine or fabricate the adapter from blower to throttle bodies and the adapter from intake to blower and the bypass for the blower. As you can see in the pics above the lower manifold they are using is a gt500 single injector manifold.

I think it would take about 12000 todo this with the throttle bodies or possible have a big mono single blade made. A person would want todo an external wastegate like pictured above. Which would require buying the lower part of the intake and modifiying it todo the external waste gate. that way you could retain your stock one.

No matter what though the blower cars would need a aftermarket fuel systems todo something like this and i believe that would still be power limited around 1000-1050rwhp. With out going in the engine and adding compression. But this setup @1050rwhp would hurt feelings:biggrin
 
At 1000+ HP wouldn't you also recommend a lighter aftermarket crank dampener.
 
I would guess at this level of build, you would have a double keyed Bryant billet crankshaft as well.
 
By external waste gate do you mean a blow off valve or am i missing something?
 
At 1000+ HP wouldn't you also recommend a lighter aftermarket crank dampener.

You, very funny. Now stop it.
 
At 1000+ HP wouldn't you also recommend a lighter aftermarket crank dampener.

I would recommend doing a balencer with an xtra key/pin on a stock crank. A billet crank is not needed if you don't spin it over 7200rpms and doesnt make over 1200-1300rwhp. You can add an extra pin with out taking the motor apart.