Re: Tuning a compound charged car with megasquirt?
 

The goal is to use the blower to get the holset moving. This is why a smaller turbo running until the big turbo spools isn't what I need. The smaller turbo, in my idea, would spool the larger turbo. I chose the M62 because it is smaller. The M90 is too much. I am just trying to spool a turbo, not feed the motor.

If feeding through the coldside would the blower be a constriction worth mentioning?

Re: Tuning a compound charged car with megasquirt?
 

You can do what you're saying, and have that compressed charge fed into the intake as well, but as soon as the larger snail makes boost it's going to outflow that small turbine.

Reversion.

Why isn't a small + large what you need?

Re: Tuning a compound charged car with megasquirt?
 

I'd twin charge it before I tried using the M62 for only spooling the turbo.

Let the added exhaust gasses and heat from the blower feeding the engine spool it.

Re: Tuning a compound charged car with megasquirt?
 

it is not what I need because I already bought the blower. So far my best bet is to blow the blower through the cold side but I am worried about the holset being restricted by it. Any thoughts on that?

Re: Tuning a compound charged car with megasquirt?
 

Strapping a roots onto your car is a HUGE project in and of itself, much less making the turbo fit and a bypass for when the turbo spools up.

Your best no-nonsense solution is to talk to Jaymez (pronouced James) at Diesel Injection Service in Ohio about what turbine housings you could buy that would spool your Holset. There are probably dozens of knowledgable people out there, but I know from experience Jaymez will take time to answer your questions and will get back to you if he needs to look up some interchange information.

Re: Tuning a compound charged car with megasquirt?
 

JD that would work though wouldn't it?

Having a small turbo and a larger turbo on the same manifold, and by the time the smaller turbo becomes a restriction the larger turbo is spooled up?

Re: Tuning a compound charged car with megasquirt?
 

ok

Re: Tuning a compound charged car with megasquirt?
 

ok

Re: Tuning a compound charged car with megasquirt?
 

Super chargers suck, most TT setups suck, but a clever American company that makes a LOT of gearboxs came up with this a year or so ago :

https://s50.photobucket.com/albums/f.../twinturbo.jpg

If the lag and spool characteristics of my holset continue to piss me off after I plumb and tune it properly I'll be building that on my ute. It's much like what waffler described above really, but it's actually running on a bunch of bmw and ford engines right now and works brilliantly ;-)

Fred.

Re: Tuning a compound charged car with megasquirt?