LBZ: Twin boost problems

[05chevy]

A buddy And I installed a 475 over stock twin setup with 60% nozzles. The truck has plenty of fuel. It will smoke till the turbo really light but will only make 40psi.

I tried opening the vane position from 35 and 1800 across the board. Thinking the small turbo might be choking the larger turbo out. Didn't really help at all with boost.

I don't think it would be a fueling issue. All though after the turbos light and only hits 40psi it is smokeless. Could the boost reference table be limiting fuel or could the larger injector nozzles be spraying more fuel then a limiter table calls for and is limiting me on the top end?

Thanks for any help.

 

[LBZrcks]

Has the MAF been rescaled?

 

[05chevy]

Has the MAF been rescaled?

It was rescaled for a s&b intake but not since we added the twins

 

[JoshH]

Have you checked for boost leaks? Do you know what kind of boost the primary is making?

 

[Kappa9012]

I can't help with the tuning, but I can tell you first hand an s480 with 60's runs 60psi all day long.

rail pressure holding good???

 

[adeso]

smokeless leads me to believe it might be a tune or fuel issue, most of the boost leaks I have seen smoke unless it is so much air that it isn't needed anyway.

 

[DangerDog]

I would think it's not enough fuel, whether it be the tune isn't asking for much or its limiting it. My 480 cleans up my tune really well, light haze on stock injectors until about 45psi then it's clear. My bigger tunes haze until about 55psi then clean up.