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Discussion Starter #1
what size exhaust housing's are you guys runing? say with a set of 66 or 70mm turbos on a 6 litter with 10to1 comp
 

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I would use .80's if it's an auto with about a 5K RPM stall. This is to get the most out of them but it will be a little laggy on the street unless you brake boost. .68's with a 4K stall would be very responsive and feel quicker all around while maybe leaving some RPM on the table.
 

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No need to have that much stall in a turbo car much less a twin turbo car.

A pair of T4's with Q trim wheels and .81 housings would be at full boost WAY before 5000 rpm.

I wouldnt have much more than a 3400-3600 behind a twin 70mm q trim .81 combo.

Twins need less stall than singles do.
 

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Discussion Starter #6
will these turbo's work looking to make 1000 rwp
Cold Side

Compressor Wheel 70mm
.70 a/r
4” Inlet and 2.5” Compressor Outlet
Inducer- 70.15mm
Exducer- 94mm


Exhaust Side:


Exhaust Housing T-4 Flanged Divided
Available in 2 A/R sizes - .68 or 1.0
3.0" Vband outlet
Inducer- 64.5mm
Exducer
 

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Turbine is too small. Looks like an ebay special. You need something with a 65 or 68mm exducer on the turbine wheel.

Consider something like precisions 6076E. A pair of those are capable of 1100-1200 hp and are only 550 bucks a piece new. They have a lot of housi g options as well. Would probably be a more reliable unit that something bought off ebay.
 

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No need to have that much stall in a turbo car much less a twin turbo car.

A pair of T4's with Q trim wheels and .81 housings would be at full boost WAY before 5000 rpm.

I wouldnt have much more than a 3400-3600 behind a twin 70mm q trim .81 combo.

Twins need less stall than singles do.
I'm basing what I'm saying on real world experience with this specific platform. :smt102
 

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As am I. Every twin turbo setup ive helped with hit its boost threshhold at a lower rpm than a comparable single setup... If its getting on boost sooner, why would you need a bigger stall?
 
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