Gas Path effects on a turbine

We thought we would share some more interesting info on the gas path and the effects it has on a radial design turbine wheel. This is something we normally hold close to our chests as this is the basis of design testing which we obviously use software simulation and CDF for, but its always nice to play physically with parts, and make mould adjustments and cast a small batch of housings to give away to our racers (especially the drifting crowd) to test for us. I will not go into too much detail - for various reasons, but im sure you will enjoy this video, and learn something from it.
• Turbine housing A/R's ...
Enjoy!

[@802Garage]

Awesome info as always. Definitely Nobody else covering these topics. I'd imagine the small details like this make a huge difference in how well cheap turbos perform or don't as well as in differentiating the big brands.

[@aftastosk6016]

I started to realize how important the internal volute structure was by looking up the MHI turbos. Still with 12 blades vs 9 blades and smaller housings (e.g. 0.57 vs 0.64), yet furious top end without any drop in boost pressure. This is the hidden subject that nobody wants to talk about. Almost everybody talks about the a/r like a number like is a ratio of boost level/spool rate by itself. However, is one of the most important parts of a turbocharger.

[@exploranator]

Okay, this looks interesting. Just started watching.

[@sonofthehill1320]

Nice video, thanks for the interesting information.

[@TurboDirectSA]

Glad you like the video

[@saied695]

I really appreciate how wonderfully you all break down all of this technology that goes into making a turbo. It's so interesting and makes me appreciate even more what goes into good manufacturing. Thank you so much.

[@CRILIKk]

Absolutely brilliant discussion topic , I learnt something new , thank you

[@WholesaleTurbos]

Everyone thinks castings are the same but this area always differs. Been doing this by hand but not many will pay for the time or knowledge

[@chippyjohn1]

Your turbine housing look like quality, wish you were open to making custom for any turbocharger.

[@TurboDirectSA]

Thank you for the compliment, we do manufacture custom products, this is why you will see some of our products without our logo cast into the component.

[@Christdeliverme]

Adding comments because these videos should be waaayyy more popular than they are currently. In time!

[@mattmorrison6958]

Love seeing info like this shared and can't wait to dig into the rest of your videos!

[@TurboDirectSA]

Thank you Matt - much appreciated, Enjoy the other content.

[@tommylyeah]

Woah.

[@FredAllenBurge]

Good stuff and so rarely covered anywhere! Now if we could get turbine maps similar to compressor maps that might be a big help also!

[@TurboDirectSA]

Unfortunately the turbine map is not as simple as the compressor map - there is so much more involved from the AFR, Fuel type used, BSFC, EMAP and many other aspects - this is why there is not much info out there on this topic, and 99% of tuners and sales teams out there don't actually know this information.

[@jesus_built_my_hotrod]

Another great video! I learn something new every time thankyou

[@finnroen2334]

Yes, the internet has failed us on this subject. Like always I enjoyed this video, but would like to know more about the modification that you said was a failure. With small A/R housings, we are porting the throats and are shortening the tounge and this works for us, but I would like to know how wrong it is to do this. :)

[@TurboDirectSA]

Thanks Finn, im afraid i wont be sharing the failure information, there are many haters who watch this channel with open ears and wide eyes - i am able to share just enough, but not enough if you get my drift.
Shortening the tongue will leave you in trouble, opening the throat does nothing, because you cannot port the entire volute. cutting the tongue will not lower back-pressure (which is the reason someone would port the throat in the first place) it simply creates lag by forcing the turbine to lose its efficiency
Been there done that in the early 2000's already with the Twin turbo RB26DETT.

[@road_2_pow_r]

Hi chris, awesome video which got me thinking abit. the exhaust gas from the engine is a bit different from the continues flow like the test bench. the energy left in some of the unburnt gases, coming from the cylinder, causes some explosive bursts of energy, also the gases move toward the turbine exducer in a pulsed manner(as the cylinders fire),.... does this also affect the exducer blade design? do we use the continues flow data from the test bench as a true representation of the turbo rpm produced, or doesnt the pulsed energy flow not really affect the rpm as much?

[@otonielaburtobermejo4774]

I have a 2013 gen coupe 2.0t, stock turbo is (47 cw/ 40 tw) i'd like to make 300- 350 whp, I'm looking into a twin scroll, journal bearing turbo, any recommendations? Car is completely stock

[@TurboDirectSA]

I would opt for the Airwerks S200SXE - use the twin scroll AR83 turbine housing with T4 flange face.

[@otonielaburtobermejo4774]

@@TurboDirectSA thank you for the reply, your videos have given precise knowledge on how I can go about my goal. I have shared and will continue to share your channel with all the car people I know

[@TurboDirectSA]

@@otonielaburtobermejo4774 Thank you sir - much appreciate your support!