Anytime.
I can't find the Hellraiser kit listed on the Hellion website. I suppose you'd have to call to have one fabbed up. Any other opinions out there?
96-04 Mustang Twin Turbo System - All V8 Models - 400 to 1,200+ hp
Here's one. Yea, when I searched their website, I didn't see one either, but when I googled it, one came up. Strange. I know they make them, though.
Excessive mechanical complexity is unreliable, lame, ill advise, and stupid.
There are plenty of ways to make a Mustang fast without turbocharging. Turbocharging is the most challenging thing that you can attempt. Trying to make a turbo car even more mechanically complex with compound boost is just plain stupid unless you are uber rich and have lots of time on your hands.
That is MY opinion on this subject.
Perfectly good point about a turbo car being more complex. But, I don't see how compounding the boost with an Eaton is any more complex than without the Eaton. The Hellraiser kit is made for the car with or without the Eaton, and the Eaton is already on the car, so I don't see how it is any more complex compounding.
lets see...if i can remember all the stuff i posted on this awhile ago.
car made like 1049hp or something like that at 41lbs of boost on the compound set up...
give me a big single with something like a 76mm turbo at 30lbs and see what numbers it makes my educated guess is near 1000rwhp.
1- less cylinder pressure
2- lower IAT2
3- less complexed
your taking air... compressing it. which makes heat. forcing it into an intercooler (or atleast should) then forcing higher then ambiant IAT's into a blower compressing it... again... what does hot air plus compression=... anybody??? HOTTER AIR then your forcing it though an intercooler thats not that great! you will soon find the limit of that stock intercooler system. and even then to make more HP then a 76mm turbo at full boost on race gas your IAT's and cyl pressure will be crazy...
wanna make 1100hp... single 88mm on c16 with an air to water set up on 30lbs
Once again, how exactly is it more complex? The kit is made for use with or without the Eaton, so I don't see how it makes it more or less complex by leaving the stock Eaton on there. Now if you were originally naturally aspirated, and wanted to put a supercharger and a turbo on, then yes, I'd agree with you about it being more complex. Especially if it were centrifugal instead of a roots. I'm not real sure how that would work.
Efficiency? Once again, I don't know anything about that like you guys do. But I do know that many people have made 1000 hp or close to with this system and the Eaton.
This guy did it on 38 pounds and pump gas. Pullied Eaton (14 lbs) and about 12 pounds on each turbo and voila. Could that be done with a big single turbo like you said? Sure, but it wont make power before 4000 rpm. Talk about turbo lag.... And, you're talking about using race fuel. These guys are making that much power on pump gas. Big difference. High IATs? Spend $500 (which is pocket change when you're talking about twin turboing) on a meth kit and problem solved.
My point: Can this much power be made "more efficiently"? Sure. Absolutely. But can you make that much power and keep the low end torque of the Eaton with a just a single or twin system? I doubt it. It really would depend on how the car is driven. Strictly a track car: sure, go all turbo. A street car: I personally like the torque of a roots SC, and if you wanted to make big numbers, compound is the way to go.
And one last point. OP, you said something about using a twinscrew and compound boost. I don't remember who posted about it a while back, but they said it couldn't be done. Something about the twinscrew makes boost between the rotors, and if you pressurize them with extra (compound) boost, it will cause them to flex and go boom. So I wouldn't plan on that.