CM871 Turbo on CM2250

[Lonestar10]

boost pressure is resistance to flow the sensor is only a few inches from the intake valves they are the restriction at that point not the turbo. the he561 if you wanted to make stupid horsepower would be better but if your looking for efficiency the he400 is better.

more air = more fuel. the 561 flows more air then what is needed on a 2250-2350 for normal horsepower ranges.

the 561 will be much less efficient when first getting into the throttle as it needs to spool up its bigger impellors.

the only thing that can improve on he400 for 2250-2350 would be impellor design that would focus on requiring less exhaust pressure to spool and create the same boost pressures.

i have a YTS stage 2 he400 its hogged out a bit on the suction side with a different impellor i dont really see a difference in fuel economy but i did have to open the exhaust side up some in the computer so that it would not overboost about 5% was the adjustment to the turbo actuator. which brought it back from making 40psi boost to 32 for my 450HP/1750 rating that walks most of these cats and detroits up hill