LB7 Boost Help, EFI

[paytonlb7]

Truck in signature,
I can not make more than 25psi boost at WOT. Correct me if im wrong but I can not adjust boost in EFI, I can only set the limit with my IMI wastegate turbo, So I have my boost table maxed at 37psi and I installed a PPE boost increase valve and still can't get over 25psi. I have plenty of fuel, more than a light haze at WOT. So I found on some forums where guys had plugged the wastegate hose and payed close attention to my boost gauge when running it. But still the same thing. I am wanting to hit 30psi max and clean up that fuel. Is there anything else I can do? Changes in fuel or timing tables??
Any help is appreciated! Thanks

 

[DuramaxPowered]

There is no way to adjust boost on an LB7 with EFILive. Your boost will be determined by fueling, RPM, and wastegate adjustment.....Sounds like you need a bigger tune.

 

[DuramaxPowered]

You might want to check for boost leaks if you have a big tune already.

 

[feltersnatch]

If I remember right the tune he is running is bigger. Fuel shouldn't be a problem. How is the wastegate adjusted.Turn Clockwise for a higher threshold?

A boost leak is a possibility.

 

[Noreaster]

How is the wastegate adjusted.Turn Clockwise for a higher threshold?

A boost leak is a possibility.

Can't adjust a stock actuator, need a BD or Banks for that
Sounds like a good application for juice grips & a test ride

 

[feltersnatch]

Thanks for the info man!:thumb: Ill try to keep him away from the juice grips, unless he wants a to buy a charger in the near future. :spit: Iv only heard negative things come from the juice grips. Is there something I'm missing here?

 

[Righteyeblind]

put a needle valve in line and crank it down till you get the boost you want. If you have enough fuel in your tune you should have no problem getting 30 psi

 

[Mike_S]

The stock actuator is not strong enough to hold over 25-27 PSIG of boost pressure, weather the signal line is hooked up or not. You can do some modifying and get the stock actuator to be adjustable like the banks unit, just takes a little time and knowledge. However, the stock turbo is already outside its map at 25 PSIG, let alone 30, so you will actually not gain anything but heat. Sure, you will have more pressure, but the temperature of the compressor discharge will skyrocket, thereby making the increase in flow a moot point. My suggestion would be to leave the turbo alone, rather than make it work harder for very negligeable gains, and chance a compressor or turbine wheel failurre. JMHO.