As I understand it, twin scroll turbine housings are designed to pair exhaust gas pulses to make the most effective use of the exhaust energy and eliminate lag. This requires header design to properly pair cylinders to each side of the divided housing and can be extremely effective, especially on smaller four cylinder motors spooling large chargers.
Our engines in factory configuration and most aftermarket setups use divided turbine housings. However they are fed by log type manifolds or aftermarket headers that do not time exhaust pulses and are then routed through up pipes that feed the turbine from each half of the motor.
This doesn't utilize the advantages of a divided housing in any way whatsoever. given the packaging challenges of a properly timed and paired twin scroll system, i'm not surprised that this would be value engineered out, but it still baffles me that we utilize a twin scroll housing in the first place.
heck, i'd almost reckon that you'd see a minor performance increase by porting out the divided portion of the uppipe collector and removing some of the divider from a stock housing, or going with a non-divided aftermarket housing. at the very least this might help create more equal backpressure between each side of the motor and make the factory wastegate more effective.
i'm just curious about our forums thoughts. maybe all i said above is correct, but it just doesn't matter when you have 7.3 liter's spooling yer stuff up.
here's a pretty good post from the lsx forums regarding twin scroll:
https://ls1tech.com/forums/forced-induction/1461494-lsx-twinscroll-turbo-design-analysis.html
Our engines in factory configuration and most aftermarket setups use divided turbine housings. However they are fed by log type manifolds or aftermarket headers that do not time exhaust pulses and are then routed through up pipes that feed the turbine from each half of the motor.
This doesn't utilize the advantages of a divided housing in any way whatsoever. given the packaging challenges of a properly timed and paired twin scroll system, i'm not surprised that this would be value engineered out, but it still baffles me that we utilize a twin scroll housing in the first place.
heck, i'd almost reckon that you'd see a minor performance increase by porting out the divided portion of the uppipe collector and removing some of the divider from a stock housing, or going with a non-divided aftermarket housing. at the very least this might help create more equal backpressure between each side of the motor and make the factory wastegate more effective.
i'm just curious about our forums thoughts. maybe all i said above is correct, but it just doesn't matter when you have 7.3 liter's spooling yer stuff up.
here's a pretty good post from the lsx forums regarding twin scroll:
https://ls1tech.com/forums/forced-induction/1461494-lsx-twinscroll-turbo-design-analysis.html