Rb25Det Garrett Gt30 Turbo Surge?

[Nuttyguy300]

Hi iv got a r32 skyline running a rb25det, I'm getting what I'm thinking is turbo surge in 3rd gear, starts making a woowoowoo type sound, lol, and feels like I'm hitting a big flat spot ,

This is my setup

Rb25det

Garrett gt3082 ar70 front housing with a 64 rear housing , 20 psi boost

900cc injectors

Walbro 255lph in tank

Fuel pressure regulator

Aftermarket coil packs

External wastegate

Apexi boost controller

Haltech platnuim pro ecu

Making 395 horse atw,

Any info would be great please so I can figure this out

[StevenCJR31]

video?

[Nuttyguy300]

It's a track car so I haven't been able to get a video

[mz.qiksky]

I know that noise. My op6 did it when I wound the boost up. I also found that the boost was spiking when it made that noise. I just wound the boost down to stop it. Have you been running 20psi for a while and it's just started now? Or have you just wound up the boost recently? It's usually caused from the turbo flowing more air than it can handle.

[Nuttyguy300]

It seemed fine on my dyno pull when it was tuned to 20psi . But I noticed it at my first drift event with the new setup, maybe I need a 82 rear housing? Cauld my 64 be to small ?

[Nuttyguy300]

Ok so I took it for a drive yesterday, I noticed it back firing alot,and almost felt surge in 2nd gear now, also my battery keeps going flat, so further investigation and iv found that my alternator has had it, broken. So I'm hoping maybe this caused all my issues and may be fixed once replaced

[Nuttyguy300]

Final update on my surge. I changed my alternator and all is good now. Car runs wicked,