t3 turbine to small for twins?
12-14-2010, 07:10 PM
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t3 turbine to small for twins? ok so i have been reading in this section for a bit and can't seem to come up with a clear answer just a bunch of opinions and arguements. The question is if i run twins is a t3 turbine going to be too small? ive seen some threads about sponsors and members running twin 35r's with a t3 housings on all different size engines. Is there a formula to calculate turbine A/R size and/or flange style? i have a 370ci with a six speed and im looking at a pair of 60mm t3/t4's with .70 A/R turbine housings.
12-14-2010, 08:37 PM
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A .70a/r turbine would still make some serious power with your 370c.i. It really all depends on what kind of power you are shooting for. Just for reference...my little 347c.i. twinturbo t3/t4's with a 62mm compressor wheel/e-cover and .63a/r turbine housing/stage 5 turbine wheel made 900rwhp (dynojet) on 23.5psi, but the turbo's are done, obviously the t3's .63a/r turbine housing is just too small to reach the 1,000rwhp range 
, well...atleast, that's the case in my combo.
, well...atleast, that's the case in my combo.
12-15-2010, 05:08 AM
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well one of my options is doing twin holset hx40 pro with BEP .70A/R turbine housings, they are supposed to flow like the gt3582r and the dsm guys say they come in 400 rpms earlier on a 2.0l . its a good quality turbo for cheap. id love to have 1000whp but it isnt a near future thing so i guess this might be a good option. thanks
12-15-2010, 02:43 PM
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I guess you would have to look at how much air flow one bank of your motor woll flow. 1/2 of your motor is going to be a 3.0L and will use 42lbs / min of air flow. Then with your pressure ratio you can look at the compressor maps and see what you can run. 
12-15-2010, 03:58 PM
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are you talking for the compressor or turbine? im just worried about having to much back pressure and choking up the engine. The compressor map calculator i did showed that i would be in the most outer island of the map at 2 bar @ 6500 rpms
