has anyone seen a compound turbo set up in the dunes?

[Kraut_n_Rice]

Damn, only Ze Germans can come up with a Rube Goldberg Machine like this... LOL.



View attachment 142978

I assume there's a diverter valve to bypass the small turbo's intake tract once certain boost levels are met...? If not, reminds me of:





Pretty cool if it works, since this appears to be a true switch from one turbo to another, exhaust path wise.

There appears to be a valve between the exducer of the large one and the inducer of the small one. Where you' "???" is.

And one on the exhaust side between the small exducer and the large inducer.

I suspect the inducer for the large one is hidden under all that mess.

 

[Rockwood]

There appears to be a valve between the exducer of the large one and the inducer of the small one. Where you' "???" is.

And one on the exhaust side between the small exducer and the large inducer.

I suspect the inducer for the large one is hidden under all that mess.

About what I figured as well.

And I'm certain none of those actuators fail ever. LOL

 

[SeanRitchie]

Derp, yeah. Downshifts are the harder part if you want all of that to be automated. Might be easier to just airshift on upshifts?

Paddle shifters require some sort of throttle blip on downshifts to "throw" the dogs out of the gear they are in so they will unload and shift into the next gear.

Upshift is somewhat easy as far as "detuning" with fuel/ignition cut to cut the torque load on the gears.

What can happen is the actuators that throw the shifter on the transmission can be faster than the ECU/throttle bodies/blow off valves can unload the input shaft and the transmission shift actuator can't rotate the shift drum since the dogs are still loaded.

The benefit of the electronic actuators (whether they are electric or air) is that you can tune in a delay so the actuator has to wait a few milliseconds until the dogs have unloaded. This is very beneficial for offroad cars since the tires are almost always slipping when shifting under load. This is where the road car guys get bit in the ass trying to make them shift super fast like a road race car. Offroad cars require a slower shift to allow the tire slip to allow the gearbox to slow down a bit and unload.

An air shifter on a small CO2 bottle will last 1000's of shifts. They use a very small volume of air per shift. They should easily last a few weekends for most people.