turbos too big?

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Mar 6, 2010 | 08:49 PM

94tt383

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turbos too big?

i have a built 5.3l lm7 that i'm going to twin turbo. a friend of mine has two of theses turbos for great deal, here are the specs:
Compressor Wheel .70 A/R
Ind: 52.76 mm
Exd: 75.46 mm
Trim: 48.9
Turbiner Wheel .84 A/R
Ind: 57.75 mm
Exd: 73.35 mm
Trim: 61.9
i dont have any mapping on them. what do you guys think?

Mar 6, 2010 | 08:53 PM

chasgiv3

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Quote:

Originally Posted by 94tt383

I run two of these in mine for comparison:
Max. Rated HP=780
Part No=PT-67
Compressor Wheel Dia.=66.548mm, 84.074mm
Compressor Wheel Trim=63
Compressor A/R Ratio=?
Bearing System=360 Race
Turbine Wheel Dia.=81.28mm
Turbine Wheel Trim=85
Turbine A/R Ratio=.85

Mar 6, 2010 | 08:57 PM

chasgiv3

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My buddy runs these:
Max. Rated HP=1100
Part No=GT42R
Compressor Wheel Dia.=94mm, 102mm
Compressor Wheel Trim=53, 56
Compressor A/R Ratio=0.60
Bearing System=Ball Bearing
Turbine Wheel Dia.=82mm
Turbine Wheel Trim=84
Turbine A/R Ratio=1.15

His is a 7 sec car mine is an 8 sec car.

Mar 6, 2010 | 09:01 PM

94tt383

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so yours are a bit larger. i'd be happy if they were good to 600 a piece, they appear to be 62mm turbos.

Last edited by 94tt383; Mar 7, 2010 at 04:04 PM.

Mar 6, 2010 | 09:29 PM

chasgiv3

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I can't find the maps for them but I'd guess they'd be a nice fit for your motor. I don't have much experience with motors smaller than 5.7 but I'd think they'd work just fine for you.

Mar 7, 2010 | 04:07 PM

94tt383

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they seem to flow a max of 84lb/min.

Mar 8, 2010 | 10:37 AM

ScorpionT

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From: White Bear Lake

Quote:

Originally Posted by 94tt383

they seem to flow a max of 84lb/min.

Those turbos are pretty small, and will only make about 400-450hp each. The turbine wheel is a fair size, but the compressor will run out of steam very quickly. They might be rated for about 84lb/min combined, but certainly not each.

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