Turbo swap help

[Beadybc]

As I found out from Swede recently: https://www.volvoforums.org.uk/showthread.php?t=328539

Going over 300hp with a b230fk is risky on stock rods.

With the hybrid 15g by Owen developments (https://postimg.cc/gallery/c0pfshw) and accompanying parts that I bought off of someone on here and fitted, he told me that it would make about 330hp whilst running 1.8 bar of boost. Does that number seem believable?

If so, how should I go about making less power? Turning down the boost causes the car to run very rich because it’s mapped for 1.8 bar. One way I’ve been told is to get a maxx ecu mini and map the fuelling that way. That same person said that I should convert the engine to wasted spark because apparently it’s much better (not for this situation just in general).

I would like just under 300hp because I do not want to get into changing the rods.

[Beadybc]

Just to clarify it wasn’t Swede that gave me that power estimate, it was the person I bought the parts from.

[classicswede]

I think someone has confused PSI and bar.
Not sure what has been done to the 15g but 26psi is going to be a lot of hot air. 18psi seems more like it and makes much more sense but a 15g is never going to make 330bhp on a B230, you would be doing very well to hit 300bhp. For the 300 mark you would really be wanting a 19t of that family of turbos.

For the power level you are looking at LH2.4 will cope, I would suggest a wideband so you can monitor mixture.

Just set the boost to 18PSI and then keep an eye on the mixture and if its off do something about it. It sounds like you have been fed a lot of fiction with very little facts

[Beadybc]

Originally Posted by classicswede

I think someone has confused PSI and bar.
Not sure what has been done to the 15g but 26psi is going to be a lot of hot air. 18psi seems more like it and makes much more sense but a 15g is never going to make 330bhp on a B230, you would be doing very well to hit 300bhp. For the 300 mark you would really be wanting a 19t of that family of turbos.

For the power level you are looking at LH2.4 will cope, I would suggest a wideband so you can monitor mixture.

Just set the boost to 18PSI and then keep an eye on the mixture and if its off do something about it. It sounds like you have been fed a lot of fiction with very little facts

I ran the car with just the spring wastegate which is set to 1.2 bar and the car was literally covering my dad's car in fuel as he was following me to the mot centre where they said that there's no point in mot-ing it because it was so rich.

I've got a wideband and whilst running the car at 1.8 bar the car would momentarily blip down to the low 10's if I did a pull.

It's got 550cc injectors that I was given with the turbo.

[classicswede]

The injectors are your problem. 550cc injectors are what you would be wanting for 400bhp region. You can turn the boost up all you want but it will not help.

You need to use injectors that match your build and that would be something in the 350cc region. Some used white 850 T5 injectors would do what you need

[Beadybc]

Originally Posted by classicswede

The injectors are your problem. 550cc injectors are what you would be wanting for 400bhp region. You can turn the boost up all you want but it will not help.

You need to use injectors that match your build and that would be something in the 350cc region. Some used white 850 T5 injectors would do what you need

I take it the stock injectors won't suffice?

The only problem is that the new ecu has been mapped to use 550cc injectors with I'm assuming enough boost to run correctly, won't swapping the injectors out screw up how it runs?

The guy who supposedly mapped it is Martin R Smith I've emailed him asking what the car was mapped to run but no response.

I got the parts from deeman940 on here.

[classicswede]

the ECU has not been mapped to a certain boost level but airflow. Martin is not stupid so he would know that a 15g could never flow enough air for 550cc injectors. If the chips are mapped for 550cc injectors then it would most likely be with a turbo in the HX35 size range

If you are set on keeping the 15g turbo you have injector size needs to come down and the size I suggested is where you really want to be. If you want to try the original injectors then make sure you refit the injector resistors or you will fry the fuel ECU

[baggy798]

Have you got a 3" amm on it?

[Beadybc]

Originally Posted by baggy798

Have you got a 3" amm on it?

Yeah the turbo came with an 012 AMM in a 3” housing

[Beadybc]

Originally Posted by classicswede

the ECU has not been mapped to a certain boost level but airflow. Martin is not stupid so he would know that a 15g could never flow enough air for 550cc injectors. If the chips are mapped for 550cc injectors then it would most likely be with a turbo in the HX35 size range

If you are set on keeping the 15g turbo you have injector size needs to come down and the size I suggested is where you really want to be. If you want to try the original injectors then make sure you refit the injector resistors or you will fry the fuel ECU

Thank you I will fit those 850 t5 injectors, run it at the base 1.2 bar and see if it stops fuel from practically pouring out the back.