I can't figure this out.

I have a .48 compressor T3 with an internal wastegate. The wastegate is adjustable and I have it set at about 8 PSI.

Here's the problem. Today the wasgate actuator bracket became loose and I started making only a few PSI. I tightened it down, and all of a sudden I was dangerously overboosting. I kept and eye on my gauge but where I was making full boost before at about 5000 RPM, all of a sudden I was making full boost at just under 3000 RPM. I liked it, but the engine would not survive long if I let the boost climb.

I adjusted the actuator and got it back to where it was, making a max 8 PSI and full boost at 5000 RPM. So here is the question: How can I limit my boost to 8 PSI but have the spool that I experienced with the wastegate actuator too tight? Please don't say an external wastegate. I want to keep the internal gate, but am willing to fab another kind of wastegate actuator onto the turbo if that will do the trick.

 

try a boost controller

 

Okay, enlighten me on how that would work. Is there a boost controller that I can buy that will output higher pressure than is input? Because that is the only way I can see that it would do what I need.

 

5000rpm for 8 psi with that turbo is ridiculous. My lawn mower could spool that .48 a/r turbine faster than that Set the internal gate for like 6psi then set a MBC at 8. Might do exactly what you are asking about.

For reference my 1.6 sohc spools the same turbine in a .63 a/r to 8psi by about 2300rpm and 11 @ 3000ish with an MBC

 

Yes, I know the spool sucked. Basically the wastegate flapper couldn't be all the way seated and not overboost. I'm trying to figure out how to fix that.

 

i think the MBC might work. borrow one to see how it works, if you can.

 

I guess MBC's are inexpensive enough; it is worth a try. Thanks.