HomemadeTurbo - DIY Turbo Forum
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HomemadeTurbo - DIY Turbo Forum (https://www.homemadeturbo.com/)
-   Engine Management (https://www.homemadeturbo.com/engine-management-10/)
-   -   Tuning a compound charged car with megasquirt? (https://www.homemadeturbo.com/engine-management-10/tuning-compound-charged-car-megasquirt-93694/)

b18. 08-06-2008 02:55 PM
Re: Tuning a compound charged car with megasquirt?
 
Originally Posted by turbowagonman
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
Compound compresses the charge twice, we're talking about a sequential setup that doesn't suck ass.

fe3tcourier 08-06-2008 05:50 PM
Re: Tuning a compound charged car with megasquirt?
 
Originally Posted by wafflesincars
Compound compresses the charge twice, we're talking about a sequential setup that doesn't suck ass.
Exactly, it's only compound in the lower rpm area when the large turbo doesn't restrict the small one and does need pre-spooling to be smooth when being transitioned into. Once the big one comes up to speed the small one gets totally bypassed and everything is efficient and lovely. 2k - 7k 20psi+ FTW.

HomeMadeTurboz 08-09-2008 01:23 PM
Re: Tuning a compound charged car with megasquirt?
 
Originally Posted by turbowagonman
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
The biggest reason this is not a viable solution for a gasoline powered vehicle is the PR's that it produces. It is easy to get 60psi out of that setup, and not uncommon to run 100psi+ As well as was mentioned it still only works over a very narrow power band. As even a full pulling cummins diesel still at most only turns 6000rpm and the boost threshold in that setup would be about 1500 - 1800rpm with use able boost not until 2200 - 2500rpm. Leaving you with a power band of about 3500rpm, or about the same as stock. In a street setup they can extend this power band a bit, but at the sacrifice of peak hp numbers.

robus 08-14-2008 08:46 AM
Re: Tuning a compound charged car with megasquirt?
 
Why would you connect the blower's output to the hotside of all things. That's retarded.

In a twincharged system you would run that to the COLD side of the turbo, thus helping to spin it quicker (you do know how a turbo works, right?).

The boosted charge (containing a much higher volume of air than aspirated) after the turbo then goes to the combustion chamber, where it comes out as as a much higher quantity of exhaust gases (-> pressure) that also help spin the turbo quicker.

:8

Eville140 08-14-2008 11:19 PM
Re: Tuning a compound charged car with megasquirt?
 
Originally Posted by turbowagonman
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.
truth, problem solved. Ford 2.3 guys have made 500hp with the 12cm housing and it spools up quick to boot.


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