did you just put in a 5.4 short block and leave the heads unported?
5.4 short block heads are 03 cobras with some clean up port work still stock valves stock 03 cobra cams
the best thing is you'll be in the 8s with a full weight non auto car. 8s is fast but what makes it better is the car isn't gutted and automatic.
I was kinda wondering the same thing.....Did you have to modify the 03 cobra lower intake or have any adapter plate's to get it to fit?
Thanks by the wayfor the driving compliant and yes i have intake adapters from reichard racing so the lower intake just bolts right on
What kind of lower intake are you using to get the eaton to fit on the 5.4? Is it a GT500 lower intake?
I'm impressed with your creativity and numbers. I really like seeing unusual combinations like this.
If I were to go compound boost, I'd probably upgrade the blower to something that's a little more efficient with lower parasitic losses and IAT temps. You could gain 100 HP just by getting a blower that takes 100 less HP to drive.
Yeah that might be in the works for next season i just been making the cold pipe bigger from 2 1/2 to 4 inch so we will see if that pipe makes the differents then maybe a tvs
It would be interesting to do a comparison with and without the blower, using something like a Procharger intake adapter (to reuse the factory intercooler), or just using a sullivan EFI intake.
I'm not an expert on compound boost... I know it has some benefits, but I just can't get over the feeling that the benefits are, in large part, being outweighed by the parasitic losses associated with driving the blower.
Someone else in here immediately shot my suggestion down to run a more efficient blower, claiming you can't run a twin screw on a compound boost setup. OK. Well, then why not find a more efficient roots blower that takes less HP to spin.
Think of it this way: Let's assume that your blower adds 100 HP at the wheels. But it takes 100 HP to run the blower. Therefore, the blower must add 200 HP to the crank in order to produce 100 HP at the wheels. There's a point of diminishing returns.
If you want to stay compound boost, get a ROOTS blower that is more efficient and takes less HP to drive. That's free power.
Compound boost isn't about peak numbers. It's about extending the powerband RPM range and increasing power across that extended powerband. The eaton is fairly efficient at lower RPM. He's running a 3.1 upper and I assume stock lower which would put him around 12 psi on a stock 4.6L. I'd guess around 8 psi on his setup without the additional turbo boost. That is really where the eaton shines. I'd love to see his IATs during a pull.
What roots blower would you recommend that's more efficient at such a low RPM?