C3 TV81 Rear Mount with Questions...
09-09-2006, 10:24 AM
#1
Racer
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C3 TV81 Rear Mount with Questions...
I’m building a 6.0L / LQ4 Iron block with 9.0:1 Mahle Pistons, Eagle 6.100" rods, 317 casting’s hand ported & polished with a Comp XER281HR 232/234 112LSA .595/.598 lift, Comp 918 Springs, LS6 Intake, 84# injectors tuned with HP Tuners and a custom Rear Mount w/modified TV81 (specs below) driven through a 4L80E and 4-Link rear w/3.08 gears.
Compressor wheel 108mm/81mm (4.270"/3.177") .95ar housing 5" inlet 3.5" outlet
Turbine wheel 95mm/76mm (3.75"/3.0") .96ar housing T6 inlet 5" outlet
Questions:
What do you think the BHP will be with 15-18 pounds of boost?
What RPM for 5-8 pounds of boost? (Shopping for a Torque Converter)
And what RPM would I see at max boost?
I'm also using 2006 C6 LS2 exhaust Manifolds, would I see any difference over headers with the rear mount?
Thanks in advance...
Compressor wheel 108mm/81mm (4.270"/3.177") .95ar housing 5" inlet 3.5" outlet
Turbine wheel 95mm/76mm (3.75"/3.0") .96ar housing T6 inlet 5" outlet
Questions:
What do you think the BHP will be with 15-18 pounds of boost?
What RPM for 5-8 pounds of boost? (Shopping for a Torque Converter)
And what RPM would I see at max boost?
I'm also using 2006 C6 LS2 exhaust Manifolds, would I see any difference over headers with the rear mount?
Thanks in advance...
Last edited by Stingraycrazy; 09-09-2006 at 10:53 AM.
09-09-2006, 08:36 PM
#2
Drifting
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DAMN! I have that same turbo in my garage and I imagined doing a rear mount set-up but due to its weight it seemed very difficult. Its very possible and i've considered doing it on my 95' with proper mounting brackets.
Another problem i've thought about with this size turbo would be getting enough exhaust pressure to utilize its potential since its at the rear. That turbo,(correct me if im wrong Rick or Bruce) but that exact turbo should be able to produce 1250hp and max out at 20psi?
I'd really like to do it myself and await some answers from other also. BRUCE has done a rear mount in his C4 and he would be one of the best to answer along with Rick (Baldturbofreak).
Another problem i've thought about with this size turbo would be getting enough exhaust pressure to utilize its potential since its at the rear. That turbo,(correct me if im wrong Rick or Bruce) but that exact turbo should be able to produce 1250hp and max out at 20psi?
I'd really like to do it myself and await some answers from other also. BRUCE has done a rear mount in his C4 and he would be one of the best to answer along with Rick (Baldturbofreak).
09-09-2006, 09:09 PM
#3
Melting Slicks
Frank
With your TV75 .96a/r you should see full boost around 3500rpm. I am currrently running 1.18a/r with TV85 housing, it is making full boost at exactly 4000rpm. Some day I will do the hydbrid conversion with TV75
.87a/r with the .87 a/r on the T6 I am sure I will see full boost at 3000rpm and that is what I want it and it would be perfect for mt taste.
The most important of the rear mount is to swain tech coated the pipe and wrapped with header wrap and I sealed off with flashing alumimun. The reason I sealed off with flashing alumimun so that the header wrap won't cause fire and no oil can get to it. It also help retain the heat loss better any way.
As for the hard to mount the turbo?? na.. here is the picture show how the turbo were mounted. Also with 18psi on the LSX motor, you should see 750+rwhp those damn LSX motor love forced induction and make mad hp.
Bruce
With your TV75 .96a/r you should see full boost around 3500rpm. I am currrently running 1.18a/r with TV85 housing, it is making full boost at exactly 4000rpm. Some day I will do the hydbrid conversion with TV75
.87a/r with the .87 a/r on the T6 I am sure I will see full boost at 3000rpm and that is what I want it and it would be perfect for mt taste.
The most important of the rear mount is to swain tech coated the pipe and wrapped with header wrap and I sealed off with flashing alumimun. The reason I sealed off with flashing alumimun so that the header wrap won't cause fire and no oil can get to it. It also help retain the heat loss better any way.
As for the hard to mount the turbo?? na.. here is the picture show how the turbo were mounted. Also with 18psi on the LSX motor, you should see 750+rwhp those damn LSX motor love forced induction and make mad hp.
Bruce
09-09-2006, 11:07 PM
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Racer
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Originally Posted by Bruce
With your TV75 .96a/r you should see full boost around 3500rpm.
That's what I wanted to hear.
Originally Posted by Bruce
The most important of the rear mount is to swain tech coated the pipe and wrapped with header wrap and I sealed off with flashing alumimun. The reason I sealed off with flashing alumimun so that the header wrap won't cause fire and no oil can get to it. It also help retain the heat loss better any way.
Thanks for the info Bruce
BTW… check out how much smaller the TV75 turbine wheel is as compared to the large TV81-85 turbine wheel. Also see how the turbine housing collar is necked down to the smaller diameter on the TV75 wheel. This is no joke... My turbo came back 7 pounds lighter after the conversion was done. The old TV81 1.39ar housing was huge next to this .96ar TV75. FYI Both the TV75 and TV81 have the same size V-band mount on the cartage.
Also, where did you get that TV81 Compressor Map? I looked for ever for that thing with no luck...
Last edited by Stingraycrazy; 09-10-2006 at 05:04 PM.
09-10-2006, 01:14 AM
#5
Drifting
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Originally Posted by Bruce
Frank
With your TV75 .96a/r you should see full boost around 3500rpm. I am currrently running 1.18a/r with TV85 housing, it is making full boost at exactly 4000rpm. Some day I will do the hydbrid conversion with TV75
.87a/r with the .87 a/r on the T6 I am sure I will see full boost at 3000rpm and that is what I want it and it would be perfect for mt taste.
The most important of the rear mount is to swain tech coated the pipe and wrapped with header wrap and I sealed off with flashing alumimun. The reason I sealed off with flashing alumimun so that the header wrap won't cause fire and no oil can get to it. It also help retain the heat loss better any way.
As for the hard to mount the turbo?? na.. here is the picture show how the turbo were mounted. Also with 18psi on the LSX motor, you should see 750+rwhp those damn LSX motor love forced induction and make mad hp.
Bruce
With your TV75 .96a/r you should see full boost around 3500rpm. I am currrently running 1.18a/r with TV85 housing, it is making full boost at exactly 4000rpm. Some day I will do the hydbrid conversion with TV75
.87a/r with the .87 a/r on the T6 I am sure I will see full boost at 3000rpm and that is what I want it and it would be perfect for mt taste.
The most important of the rear mount is to swain tech coated the pipe and wrapped with header wrap and I sealed off with flashing alumimun. The reason I sealed off with flashing alumimun so that the header wrap won't cause fire and no oil can get to it. It also help retain the heat loss better any way.
As for the hard to mount the turbo?? na.. here is the picture show how the turbo were mounted. Also with 18psi on the LSX motor, you should see 750+rwhp those damn LSX motor love forced induction and make mad hp.
Bruce
09-10-2006, 01:52 AM
#6
Melting Slicks
Shinobi-x
we run -.04AN braided line and run a oil restrictor before the turbo. As for the oil return, we use a surflow heavy duty oil pump(self prime) to suck out the oil and route it to the oil pan.
Frank
Here is the map for TV81 turbo. It is 125bls/min that is exactly good for 1250hp.
Bruce
we run -.04AN braided line and run a oil restrictor before the turbo. As for the oil return, we use a surflow heavy duty oil pump(self prime) to suck out the oil and route it to the oil pan.
Frank
Here is the map for TV81 turbo. It is 125bls/min that is exactly good for 1250hp.
Bruce
09-10-2006, 11:10 AM
#7
Racer
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Originally Posted by Bruce
Here is the map for TV81 turbo. It is 125bls/min that is exactly good for 1250hp.
I plotted the 364 lbs/min air flow over the TV81 compressor map and it looks close to surge but that wouldn’t be a problem with a 4" crank and a 408.
This wheel has tons of room for growth 
The wheel looks well suited for mid to top end flow and it operates close to the center of the island. (Max Efficiency) I'm going to use 3.5" aluminum tubing for the return which I hope will act like an intercooler but with little or no pressure drop. Add some Meth to the compressor inlet and hold on
http://www.forcedinductions.com/consumption346.htm
http://www.forcedinductions.com/consumption408.htm
Last edited by Stingraycrazy; 09-10-2006 at 11:12 AM.
