Twin Charged, Compound boost with BW S475 Turbo and TVS 1900 Blower On A Truck
06-29-2009, 12:43 AM
#1
Twin Charged, Compound boost with BW S475 Turbo and TVS 1900 Blower On A Truck 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.
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. 
06-29-2009, 10:29 AM
#4
And it only had the 44mm seat in it with a 8psi spring. I put the 50mm seat in it and the 4 psi spring with no preload spring and it is boost creeping BAD. I think its cuz I put more sweep in the header tubes coming off the head to the log. If I had put then at 90* to the log, then some of the exhaust could back feet to the WG. Probable have to just move the gate to the manifold, or add a second one right before the turbo.
06-29-2009, 10:43 AM
#5
the reason it was working for you guys before was because of the not so ideal turbine housing/wheel combos. The only way that gate setup will work good is with extreme back pressure. You would be just fine with one gate up on the log where it sweeps into the turbine housing.
Looks cool though should be a blast, I like the length of the cold side piping hahahaha!
Looks cool though should be a blast, I like the length of the cold side piping hahahaha!
06-29-2009, 11:15 AM
#6
the reason it was working for you guys before was because of the not so ideal turbine housing/wheel combos. The only way that gate setup will work good is with extreme back pressure. You would be just fine with one gate up on the log where it sweeps into the turbine housing.
Looks cool though should be a blast, I like the length of the cold side piping hahahaha!
Looks cool though should be a blast, I like the length of the cold side piping hahahaha!
and its so easy to get to. I can have it off in less then 5 minutes to change the spring there, 
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06-29-2009, 03:59 PM
#8
I've already had this blower/turbo setup running with a MPT76 turbo and a 38mm gate in the cross over and was able to maintained 9psi, but that was with a much more restrictive T4 p-trim .96 turbine and a 38mm Tial WG. I think the new problem is the fact that this turbine is so much bigger, it just keeps driving the compressor even with the WG full open.
Believe me, the thinkin wheels are already in motion on the "fix" for it 
This aint my first rodeo! 
06-30-2009, 03:45 PM
#12
Found my boost creep problem, This is the flex coming off the waste gate...
This was a brand new flex coupler and was not like this when I installed it. Kinda weird it did this. I don't know what happened to it, it looks like the lining was to big and then jammed in there and then expanded and folded in on its self. Both ends are still crimped. VERY strange...
This was a brand new flex coupler and was not like this when I installed it. Kinda weird it did this. I don't know what happened to it, it looks like the lining was to big and then jammed in there and then expanded and folded in on its self. Both ends are still crimped. VERY strange...
Last edited by kbracing96; 06-30-2009 at 03:54 PM.
06-30-2009, 04:03 PM
#13
they do that, you should NEVER use a standard flex like that on a turbo set up, they HAVE to have the lining in them, or they will do that. Its just a matter of time and they all will. you should get the correct ones and i would change the one in the crossover as well, those are pieces of ****
07-01-2009, 02:49 AM
#15
twincharge .. blower for low end and turbo for top end power
however it wont work if your blower is set for 6 psi and your wastegate is set to go off at 6 psi.
basically once the blower runs out of steam the turbo can take over to give more flow
however it wont work if your blower is set for 6 psi and your wastegate is set to go off at 6 psi.
basically once the blower runs out of steam the turbo can take over to give more flow
07-01-2009, 10:18 AM
#16
These supercharges are only good for about 10psi before you start running into belt slip problems on a 6 rib setup, so the turbo will be used to get the 15+ I'm wanting out of it. The setup I have now, will have the blower making about 7psi and spool the turbo and then the turbo should carry it to the 15-18 I'm looking for. And it's just cool,
Last edited by kbracing96; 07-01-2009 at 01:49 PM.
i think you should send it downunder to me in NZ to dispose of it. 