us there really anyway to do a twin single sequential setup mechanically?or do i hafta use electronics.can i get two of the same turbos and have different a/r housings?or have two internal w/g turbos with different a/r's and have one w/g dumping into the other turbo?sort of like a bypass system?

 

no help?

 

Manifold would be a pain to fabricate.

I'm not sure if the wastegate will dump enough exhaust energy to make decent power out of the secondary turbo.

J

 

i have already done it once and am doing it again right now here is a pic of the system

 

you only need a single 40 mm wg to control them and yes you have to play around with turbine a/r's and wheels to get it right. took me a year to get it right! it is a touch laggy but when it kicks in it STOMPS ***!!!!

 

turbostreetfighter. that looks like twin turbo no
sequential turbo.

im4u is looking for sequential turbo.

 

Why couldnt he just run a smaller turbine AR on one of the turbos and let the laws of physics take place?

 

I would think if you didnt have a way to switch from small turbo to big turob that the small turbo would generate too much heat once it get out of it effeinet range. and would wear out faster becuase its being over spoolled.

 

Border-racings over 500hp twin turbo set-up....

 

What does that run?

 

Actually..

If you had 2 small turbos and plumbed the 1st turbo wastegate to the second small turbo...


When the first one was completely spooled the second would automaticly start spooling...


They would have to be fairly small turbos though..



-Zach

 

BTW you would also need a flapper on the second turbo that opened slowly as the second turbo spun up.. or you would backspin the 2nd turbo...


-Zach

 

wtf, none of these pics are sequential. this guy's looking for a sequential system not parallel.

 

I have been thinking about an aftermarket setup for the past few days. This is what I have come up with...

I noticed that on a newer motorcycle, I forget which one, there was a part in the exhaust that had butterfly valves in it that would restrict exhaust flow at lower RPM's so that exhaust velocity would be better. I wanted to use one of these that had a butterfly valve on one of the turbo exhaust inlets.

This valve would stay closed while the first turbo spooled. When the first turbo reached full boost, the wastegate would open and the exhaust would go to the second turbo. As it spooled and built boost, it would open the butterfly.

As the second turbo built boost, there would be a flapper valve on the intake that would start to open. This way the second turbo would not back spin, and it would be a smooth transition for the boost.

This would keep it pretty uncomplicated. There would have to be one actuator for the butterfly valve on the exhaust that was controled by boost pressure of the second turbo. The flapper would be spring loaded, and it would open itself with the boost pressure from the second turbo. It would also act as a check valve so that the boost from the first turbo would not interfere with the second.

Can anyone point out problems with this?

Kenton

 

Yeah, what does that run and is it smogable? What, wha???

 

Are you plumbing the wastegate from the first turbo into the second turbo's runner?

 

Yep, the first turbo's wastegate is going to dump into the the runner of the second, after the butterfly valve.

 

You should look at the SUPRA JZA80 stock sequential setup it is mechanical , I think there is an door in the manifold which is opened at a certain boost pressure by a wastegate type actuator , bringing the second unit on line, the pre spooling is controlled by adjusting the length (reach) of the actuator rod. TURBONETICS sells the NEW GEN wastegates which can be used for this purpose . You might need to build the manifold with a "cross" pipe to send the exhaust from the second rotor to the first turbo and place the door closer to the second turbo , down stream the crossover point to isolate it until it is not required , you might also need to place another in the cross pipe to close when the second turbo is on line.

 

Here is a really really crude drawing of it in paint...

 

Unless you can live with UNLIMITED boost you still need a wastegate for the second turbo - at which point you have functionally duplicated the FD's stock system! (wastegate, turbocontrol, chargecontrol) in the system you describe your "wastegate" is functioning the same as the turbocontrol and your "flapper" in the intake is the same as the chargecontrol and you have no true wastegate, ie a method to dump(or WASTE) exhaust around the turbines to control maximum boost.

 

Delete

 

Like This

 

please let me clear this up after work. I will include a VERY detailed schematic I have been thinking/designing this for A WHILE!
Patrick

 

I messed up the crappy drawing by not putting on the equalizer pipe before the butterfly valve.

This setup is assuming both turbos have internal wastegates to limit the maximum boost. The pipe that you said was not needed is the exhaust that is being bypassed by the first turbos wastegate to start the spooling of the second turbo. I did not draw a pipe off of the second turbo's wastegate.

Does that make more sense now?

Kenton

 

Here is a new and improved drawing (still sucks) of what I had in mind. It explains what some of the pieces are...