tuned exhaust manifold

[govproperty]

I have seen n/t cars that had the exhaust tuned based on the pipe size and exhaust scavenging. Is it possible to tune an exhaust manifold based on the turbo as a restriction. The exhaust pulses would bounce off the turbo and pull the exhaust from the cylinder head or would the exhaust pulses have to go out to the atmosphere before it bounces back to the head. Also the turbo might cancel out the whole exhaust scavenging together. Just another idea that might help spool up. If it has already been said I apologize.

thanks
matt

 

[absolute_DSM]

The best idea for a turbo car would be a divided housing (1-4 and 2-3) so the exhaust pulses are not interfering as much with each other.

There really isnt a tuned housing for a turbo, get the gases out as fast as possible.

 

[govproperty]

So it doesn't make any difference if the runners on an exhaust manifold are short like a stock or FP manifold or the runners are long like tubular manifolds?

 

[dieseltech]

What he's saying is you want to make sure the gas pulses reach the turbo at different times. There isn't much of a scavaging effect to the turbo but you can benefit from a good header design. It could help spool time and underhood temps in theory. Scaveging is more noticeable in N/A engines. It all depends on what you're after. For example a Y pipe on a truck can improve low end torque. Use the same truck and put on a true dual exhaust and you have just increased top end horsepower but have decreased low end torque.

 

[Defiant]

There doesn't need to be exhaust scavenging. The intake is pressurized. Valve overlap and intake swirl take care of it.

 

[govproperty]

well it seems I was wrong about tunning exhaust manifolds and absolute_DSM was right. So, is it possible or cost effective to purchase a divided housing for my pte 5031e?

 

[TSiAWD666]

The term commonly used to refer to such a housing is "twin scroll". That might help you in your search.