cbrfrenzie said:

There are several factors that can contribute to a slow spooling turbo. The BEP DSM bolt-on turbine housing should hit 20+ PSI by 5000 RPM with the HX40 Pro no problem. Here are a few things to check:

I know you said you did a boost leak test, but I would try it again with the engine in 4 different locations (exhaust valves open for each cylinder). This will check to make sure your exhaust valve stem seals are not leaking. Be sure to warm up the engine first.

Make sure the timing is set correctly and not off by 1 tooth (it is possible to be off by 1 cam gear tooth and not smash the piston with a valve).

Take the turbo air intake off and spin the turbo with your hand. Make sure it spins freely.

Make sure the waste gate flapper is fully sealing shut when the actuator arm is attached. You can also try and loosen the actuator mounting bolts and try to apply some pre load to the waste gate flapper and re-tighten the actuator mounting bolts.

This may sound stupid, but make sure the correct O2 housing gasket is used. There are several different flavors of these and they all look very similar to one another. There are O2 housing gaskets for the following Mitsubishi turbine housings:
6cm O2 housing gasket
7cm O2 housing gasket
7cm EVO III O2 housing gasket
I think there may be a 3rd 7cm O2 housing gasket, but not positive
8cm O2 housing gasket

Is there any kind of boost controller installed? If so make sure it is connected properly and is functioning as intended.

Has it been slow spooling since day 1 of the turbo install? If not, what was the last thing that was changed before this started happening.

On a side note, you should submit that turbo to the Guinness Book Of World Records, as 1,000k miles = 1,000,000 miles!!! Sorry had to poke fun at ya on that one

Click to expand...

cbrfrenzie said:

There are several factors that can contribute to a slow spooling turbo. The BEP DSM bolt-on turbine housing should hit 20+ PSI by 5000 RPM with the HX40 Pro no problem. Here are a few things to check:

I know you said you did a boost leak test, but I would try it again with the engine in 4 different locations (exhaust valves open for each cylinder). This will check to make sure your exhaust valve stem seals are not leaking. Be sure to warm up the engine first.

Make sure the timing is set correctly and not off by 1 tooth (it is possible to be off by 1 cam gear tooth and not smash the piston with a valve).

Take the turbo air intake off and spin the turbo with your hand. Make sure it spins freely.

Make sure the waste gate flapper is fully sealing shut when the actuator arm is attached. You can also try and loosen the actuator mounting bolts and try to apply some pre load to the waste gate flapper and re-tighten the actuator mounting bolts.

This may sound stupid, but make sure the correct O2 housing gasket is used. There are several different flavors of these and they all look very similar to one another. There are O2 housing gaskets for the following Mitsubishi turbine housings:
6cm O2 housing gasket
7cm O2 housing gasket
7cm EVO III O2 housing gasket
I think there may be a 3rd 7cm O2 housing gasket, but not positive
8cm O2 housing gasket

Is there any kind of boost controller installed? If so make sure it is connected properly and is functioning as intended.

Has it been slow spooling since day 1 of the turbo install? If not, what was the last thing that was changed before this started happening.

On a side note, you should submit that turbo to the Guinness Book Of World Records, as 1,000k miles = 1,000,000 miles!!! Sorry had to poke fun at ya on that one

Click to expand...

TxR6guy said:

Mods:272 hks cams
Stock Head
Stock Intake manifold
Hx40 pro Bep housing
E85
2.0 liter
Stock 1g timing map

Having problem's getting this turbo to hit full boost, it's not hitting full boost till 6k and ive done a full boost leak test turbo has 1,000k miles on it and no exhaust restrictions..getting kind of stumped right now.

Any Ideas?

Click to expand...