Nope, that's the whole point to "compound boost"!
The nice thing about it though, is that you get none of the lag, or violent, short power bands that you'd get with your standard turbo set up. The blower comes on right off idle and gets the party going until the turbo gets up to speed and takes over on the top end.
The parasitic loss isn't nearly as bad as it would be with the blower alone, because you've got the turbo literally force feeding the blower at the top end and taking a lot of the work out of the process.
.....and how does 1,188 rwhp and 1,015 rwtq sound.
Check out the MM&FF write up on the install and testing of the kit.
Compound Boost 2003 Mustang Cobra Twin-Turbo - Muscle Mustangs & Fast Fords Magazine
Yeah, the Mach's got a forged crank (assuming you got the 5-speed. The Auto's got a nodular iron unit), but otherwise the rods powdered cracked cap design and the pistons are hypereutectic just like the GT and early Cobra 4V's.
I've still seen guys make into the 450rwhp range safely with them though.
Yeah, at some point the Eaton does become a restriction. The same set up run with an '01 Cobra manifold actually made a good bit more peek power but as you said....streetability becomes questionable. At those power levels turbo systems alone on a small displacement engine like our 4.6L tend to be really soft down low and become ultra violent in the 4,000RPM range. Great if you're at the track and able to load it up off the line, or if you're trying to build a dyno queen, but its not something that sounds very pleasant for a daily driver.....especially in stop and go traffic and under moderate throttle.Yea, 1100+ HP does sound nice! But I read an article in another magazine (I'll try to find it later) that did a comparison with just supercharger, compound supercharger/turbo, and finally just turbo, and IIRC, the turbo by itself was outperforming the compound motor by like 3000-3500 rpm, and made much higher peak numbers in the end. I believe the control in the experiment was the boost pressures were held constant between all 3 setups, but I don't remember for sure. Regardless, 1100HP is a lot of power, and I feel like when you get into that playing field, its really just whose peak numbers are bigger. Like a battle at the dyno. Its not like you can use all of those ponies on the street!
