i need to know the main difference in these two turbo's, performance wise. i'm going with a halfbridge by BDC and will be running low boost on pump gas and really turning it up for race gas (probably to 25psi) which of these two would be better for low boost (~10psi, 400RWHP or less) for the street and high boost (~25+, over 600RWHP) for the track. I'll be on the street more than the track with it, but want to have whichever would be best for more power at the track.

Non Ball Bearing, Comp: 102mm, 53 Trim, .60 A/R Turbine: 82mm, 84 Trim, 1.15 A/R, 227641

and

Non Ball Bearing, Comp: 94mm, 56 Trim, .60 A/R Turbine: 82mm, 84 Trim, 1.15 A/R, 227642

thanks

 

anyone please explain those differences? will one make more power or spool faster or what? i just wanna know the difference guys...

 

Non Ball Bearing, Comp: 102mm, 53 Trim, .60 A/R Turbine: 82mm, 84 Trim, 1.15 A/R, 227641

The larger compressor wheel on the 102mm is going to create more overall power at top end. The 1.15 A/R is pretty laggy in general, esp for a journal bearing turbo.

and

Non Ball Bearing, Comp: 94mm, 56 Trim, .60 A/R Turbine: 82mm, 84 Trim, 1.15 A/R, 227642

This is going to spool about 3-600RPM faster than the 102mm compressor, and its still good for lots of power.

If you're looking to get 400hp @ 10psi - it'll be close. You said ~ so I figure a safe bet would be 370-380hp at that boost level. With the 102mm compressor and your half bridge, you'd probably see boost around 4500RPM and at 25psi you'd be close if not at 600hp around 7500RPM. Those are just rough estimates.

You figure the larger the compressor wheel, the more top power, the larger the hotside (turbine) wheel - the more lag. Trim has some weight in this, but I'm no expert.

Just my $.02

 

The only major difference is the comp wheel. The larger comp wheel will help you on the higher pressure ratios. It has a map that favors more airflow. If you were running a standard ported motor. I would say stick with the smaller of the two.