Just curious about the max boost of an he351. I have the wastegate solenoid plugged with an ATS plug. I have an adjustable boost elbow and i plan on tapping the ATS plug for the adjustable boost elbow. I just threw it on and ran it like it is to see what it was like. I read somewhere that these turbos are supposed to push over 40lbs of boost. I know it's out of the map efficiency of these turbos and i didn't plan on pushing it that hard but i could only get 32ish lbs out of this turbo. I plan on using it to spool either an HT60 or S471 whichever i come across first but just curious about the low boost. Also read somewhere that the wastegate will open on its own with drive pressure around 32is lbs. Just looking for some input. Thank yall

 

if you have the solenoid plugged, how is the wastegate being held shut? if the actuator is still attached, it will not open from drive pressure, not close to 32 psi boost pressure anyways.

stock, the he351cw is wastegated at 40 psi (with 12v applied to the solenoid) so 40 psi is not out of efficiency.

do you have stock injectors? with my setup and stock injectors, I can only hit 32-34 psi max. does the overpriced ATS plug also plug the small hole under the plug that will leak boost back into the inlet of the turbo?

 

Yes the ATS plug seals off the smaller interior ports. I had a diesel auto power plug that did not seal them off, could only get 20lbs with it so i upgraded to the ATS plug. The actuator is still hooked up so I'm assuming it is holding the wastegate shut. I'm running 5x16 SAC injectors from DAP

 

I have my wastegate tacked shut and can touch 40psi with stock injectors.

 

I'm guessing that my drive pressure is opening the wastegate then. I'm heavily fueled plus large injectors and I'm pretty positive i don't have any leaks boost wise. Don't know what else could be causing the lack of psi

 

I've been experimenting with different springs for the home made spring gate on my 351. Right now my spring is a little too heavy and I cannot hold the pedal to the floor because I've seen 45psi and I'm on stock head bolts. I gutted the solenoid and welded all the holes in the top.

 

most posts i've read say that ~90 psi of drive pressure will get you close to 40 psi boost, but I'm not so sure about that after installing my spring gate. what is the rating on the spring you are using? I will double check mine when I get home, but I think the spring I'm using is only rated at 62 lbs and I'm not opening it yet at 32 psi boost.

here is what mine looks like

 

[QUOTE=j.fonder;[/QUOTE]
Man I wish I knew the rating. I'm just using the one bigger than the one I first tried that opened around 33. Hardware store special, no indication of weight. The one I've got looks shorter overall and heavier gauge.

 

if you have an ace hardware or fastenal close, check them out, they have the spring rating on the package!

 

So if i remove the stock actuator and go the spring route to control the gate, what rating spring would i use to open the gate around 35psi?

 

Is it possible for the actuator to wear out. I unplugged the hose going from the compressor housing to the actuator and plugged in my air compressor in. With the pressure regulator on my compressor i can hear the wastegate opening up around 30psi. I'm assuming my actuator is wore out which is causing my low boost?

 

what makes you think that a brand new one wouldn't open under the same 30 psi? the stock actuator was designed to open at 20 psi with no voltage to the solenoid and 40 psi with 12v applied (basically restricts air flow to the actuator to 40 psi).

I have a spare he351cw actuator at home, I'll put 30 psi to it and see if it opens

 

Makes sense to me. Im no turbo guru and did not completely understand how the solenoid on this turbo worked. Please let me know your findings

 

If that is the case (which I highly doubt) then that turbo is really inefficient at that boost level (which it isn't).

When I had my first gen it would take about 50PSI of drive pressure to make 40 lbs. of boost. At 30 it took about 32.

 

thank you!

so i guess my 62 lb spring won't do me much good if I want it to gate at 40 psi(when I actually have the fuel to get there). as for now, can only hit 32 psi max boost. I'll look for a spring closer to 50 lbs