My car was tuned to run 27psi on the stock turbo (16G-10.5T)on pump gas. Since then ive upgraded to a larger bolt on turbo(td06sl2-25G-10.5t).everything else on the car remains the same (2.3L stroker,750injectors,fuel pump etc). Is it safe to run the car without any tuning changes? my tuner is always busy. What major changes to the map has to be done? so far ive noticed no knock on the knock sensor scale which is 100 on the power fc. the tune seems to be rich even in spool. Ive noticed Injector duty cycle has increased by 10% with larger turbo.

 

If you are hitting higher load cells then you did with the previous turbo, which i assume you would otherwise whats the point, then you are hitting an untuned area of your map. Maybe the approximations that are there will work maybe they wont, are you willing to risk blowing up your motor is the question.

 

What are your AFR's?


But yes, you should really have the tune gone through again to check for any adjustments that need to be made, as there very likely are some.