5sgte bogging/hesitating on accel. Options

[TurboToys]

My friend has a 94 celica gt that we turbo'd about 4 years ago. It had a st165 ct26 setup and map sensor, 7mge injectors, walbro 255 and no intercooler( i keep telling him to install one). The car ran beautifully until he decided to install a twin entry setup that he had layin around from his st185. I dont think this would be the cause but it quite possibly could be.

Going from a stop on accel. it bogs, spits, sputters, pops, hesitates as soon as the boost comes on according to the gauge. It kinda feels like boost leak on MAF sensor car. His narrowband A/F guage reads lean while this is happening then goes rich and takes off like a rocket.

Compression is at around 180psi on all cylinders, ignition timing is at 5 deg., swapped map sensors with the one from my st165, changed spark plugs, tried running it n/a and it still acts the same.

There are no codes in the ECM.

Just curious if anybody has experienced this or something similar.

Any help is greatly appreciated. Thanks

[Culpable04]

he needs something to tune the fuel with if he really wants to fix that, and even then depending on the capabilities of his option, he may still have little burps and what not, the better the tuning the better the engine will run.

I'm surprised he didn't have this same issues with the previous turbo, but a twin entry turbo is a lot more efficient than the single entry ct26, so maybe that's why the issue is pronounced enough for him to notice it.