How much boost can a hx35 take with 275s and a edge comp

TIA
Dan

 

I have understood

NOT FROM experience.. but anything over 38 lbs will grenade the hx 35. I wouldnt push it more than those 35 lbs at most. 35 psi is the maximum it was engineered to blow into ur intake.. and the most efficient maximum operating boost. Anything over that is just hott air and will actually hurt you rather than help you out..

Tx

 

You could regularly go up to 45lbs with an hx35 and I wouldnt worry too much.

 

40 to 45 no problem at all. Not terribly efficient up there, but no damage worries. 275's and a comp wont push it there anyway, even with the wastgate wired. So Have fun !!


KP

 

Well,

i learned somethin new today.. i will update my lil rolodex... thanks guys!..


Tx

 

the compresser is capable of 45...i have done it accidentally with an ill-adjusted boost modifier. The problem with this is two-fold.

firstly, turbo speed is WAY outside its operating range and you're looking for coked bearings and emminent failure. axial and radial play felt in an overspeeded turbo for any length of time is quite obvious....if it already hasn't grenaded that is.

Secondly, at that pressure, the intake air is so hot that is not usable boost. Sure the pressure may be up, but because of the high air temp you are not getting the respective VOLUME. EGT's rise quickly and power production falls. Drive pressures are also through the roof....which affects the cylinder's ability to ingest a fresh air charge.

I can literally feel more power down at 35psi over a higher 45psi. If this difference can be actually felt, imageine what it would look like on a dyno. Don't be misled by those bypassing their wastegates. If you don't have the fuel, no turbo will boost past the available energy's supply. if these same folks bypass a wastegate with aggressive fueling, their 35's would display the same woes.....overspeed, high intake temps, and power loss, they just happen to not have enough fuel to overspeed the turbo at their current state of fuel.

So in closing, you can make more power with a 35 at mid 30's than 40 plus. This is only because of the compressor map though. An hx40 will make more power at 40 than at 35.....but this is due to a fatter efficiency map. So don't confused by boost numbers. They are dependant on what turbo is making them as to whether they are efficient or not.