Re: Tuning a compound charged car with megasquirt?
 

think about it blackman, the large one would act as a wastegate, never allowing the little one to spool. (think pressure difference)
however, if flappers/valves are involved, then it will work. (like a sequential twin turbo rx7 or 2jz (same size turbos))

ok



fred, is that the setup on the new 3.0l turbo diesel in the x5 (and others) ?
which fords? euro diesels? jags?

dan.

Re: Tuning a compound charged car with megasquirt?
 

Waste gate is more free flowing than a turbine, I assume it would bleed off some pressure but it's not going to act exactly like a wastegate because the gas still has to work it's way around the turbine. Unless you have a piss poor motor displacement wise there is going to be some back pressure.

Flappers would round it out to work much more efficiently.

Re: Tuning a compound charged car with megasquirt?
 

That company is approx. 15 miles from my house lol. I have a friend on the research team that tests newer designed turbos using that specific setup. Pretty cool stuff.

Re: Tuning a compound charged car with megasquirt?
 

Not all of the bmw diesels use them, but some do, and the ford is the f350 maybe? not 100% sure, and don't care at all. I just care that I can build such a setup and have 20psi from 2k to 8k seamlessly :-)

The check valve is the key thing. NONE of the other TT setups are any good IMO. This though... aside from being a bit large/heavy/complex is absolutely brilliant IMO.

SOMEONE BUILD ONE SO I CAN OGLE AT IT!!!!!!!!!

I'd have built one already if I wasn't stuck 11000 miles from my MIG :-(

Fred.

Re: Tuning a compound charged car with megasquirt?
 

You can ogle the ass end of my car if I build it.

Re: Tuning a compound charged car with megasquirt?
 

whats so hard about running compound turbos. no need for any flap valves in a dual exhaust manifold. the 2 turbo setups on all the diesel trucks are compound. small turbo on the manifold, with the exhaust from it spooling the big turbo. by the time the small one runs outta spool, the wastegate on it opens and the big one keeps spoolin.
http://www.4btswaps.com/forum/attach...4&d=1181210907

Re: Tuning a compound charged car with megasquirt?
 

Oh and the 21cm housing is worthless on that turbo. throw it away and get a wastegated 12cm from an hx35 holset, or at least a 16 non-wastegated.

Re: Tuning a compound charged car with megasquirt?
 

Please do, I'd love to see it work!

Nothing's hard about it, but you want the wastegate on the small one to be huge for low restriction (I'm thinking 60mm vband) and you want to bypass the small turbos compressor when it stops flowing or you are choking the big turbo hard out...

The borg warner system is a beautiful thing indeed. Standard compound turbocharging is ugly.

Fred.

Re: Tuning a compound charged car with megasquirt?
 

explain, but it still works...































lol smashed, i like beerssssssssssssssss

Re: Tuning a compound charged car with megasquirt?
 

It still works on diesels where IAT doesn't matter a damn. It's ugly because it's not efficient everywhere. It's ugly for lowish boost 20 - 30psi because it's designed to increase the total pressure output of the system. Finally, for a gas engine, it's ugly because both turbos need to be large and you may as well just have one on there for any semi reasonable pressure.

The borg is beautiful because you get to put an _under_ sized turbo and an _over_sized turbo on the engine and get the best of both worlds with no compromise besides weight and complexity. The best solutions are often the most simple.

Fred.