Twin Charged, Compound boost with BW S475 Turbo and TVS 1900 Blower

[kbracing96]

Ok, So I finely got my new Borg Warner T6, S475 turbo and started mocking it up on my old turbo kit and decided it would be easier to just build a whole new set of hot pipe. This would let me build them bigger and place the turbo so it could blow strait into the supercharger and get rid of the a/a intercooler in between the turbo and blower. IAT's were never a problem with the old MPT76, so I don't think it will be a problem without it. The Eaten has a fairly large heat exchanger under the blower and with spraying meth in between the two compressors seems to work just fine. Here are some pics of the new setup.




Cold Side piping lol.




Hot Side piping







And I finally found a setup where the waste gate like this won't work.


I have built quite a few turbo kit with the WG in the cross ever and never had any problem with them. But it's not working in this setup. I have the softest spring you can put in the Synapse WG (should be about a 4 psi spring) and it still keeps on boosting. I've seen upwards of 18+ psi before I lifted and the blower is only pullyed to run about 7 psi, so the WG should be dumping everything over that. My thinking is that the hot side of the turbo is SO big (T6, 1.36 a/r, 96mm turbine wheel) That it only needs exhaust from one side of the motor to keep on building boost as everything from the drivers side is going though the WG and there is not enough back pressure to "back feed" the WG with exhaust from the passenger side. So, I think I'm gonna have to move the WG to up on the manifold just before the turbo so it can dump everything.

[bangbangskeetskeet]

Dude! Thats looks effing sweeeeet! Love the exchange between the turbo...which is a dang giant!...and the blower. Everything seems to be coming along pretty well so far...other than the gate problem, but Im sure you will get that ironed out soon enough.

Any ideas on how much power you will be making with this set-up?
Also how much do you plan on running now?

[zebra]

wow!! simply awesome!!

sounds like you know what you're doing, so i'd say you'll work out the WG problems.

once it's running, you gotta put pics & video!!

[zeake]

Are you running 2 boost gauges? How about EGT gauge.
I bet that the hot pipes get really really really hot. Bad to the bone though. You should name it the Hugh Hefner kit.

[RedHeartbeat]

thats got to be hard to regulate. If the turbo puts out 4psi of boost and the s/c has a 4 lb pulley doesn't that output 16psi? The wastegate is getting its boost level signal from the turbo feed pipe to the s/c?

[zeake]

thats got to be hard to regulate. If the turbo puts out 4psi of boost and the s/c has a 4 lb pulley doesn't that output 16psi? The wastegate is getting its boost level signal from the turbo feed pipe to the s/c?

WOW I didnt think about it that way.

[CHEVROLADE]

damm nice set up,hope u get that little bug out of the way,cant wait to see vid...

[kbracing96]

Thanks Guys

thats got to be hard to regulate. If the turbo puts out 4psi of boost and the s/c has a 4 lb pulley doesn't that output 16psi? The wastegate is getting its boost level signal from the turbo feed pipe to the s/c?

Not quite, but close. It multiples pressure ratios. Here is a chart that show what boost from each unit will equal when multiplied by PR.



The boost is regulated by the waste gate, same as a normal turbo setup. It is referenced to the manifold under the blower, so it sees ALL the boost from both compressers that the motor is getting.

I'd like to see about 700rwhp or so out of it when it all working like it should

[farmtruc]

When you get all the bugs worked out, I'm gonna be very interested on how this works out.
My prediction is: the truck will run faster with a turbo alone, but that is just a guess.
Also, I think it'll have decent take off compared to a solo turbo.

Hurry up, we want to see this!

Keep it up!

allen

[r.barn]

Simple fix for your boost creep problem,

Move wastegate to the outside radius of the crossover so that
as exhaust starts to make turn up to log header its running right
into the wastegate exit as it hits that outside turn.

Corky Bell goes into this at length in his book.
Enough exhaust gasses just cant make that 90* turn into the w/g pipe.

Would bet $100 that fixes it right away with keeping it under the truck still