Internal WG on Big turbo (CREEP)

[GReddyGST97]

Ok. Its a TDO6 20g, but with a 57trim compressor wheel and a ported turbine housing on a 39mm flapper with bigger port.
TDO6 Turbine wheel

Before doing the 39mm flapper mod, the car on stock boost suposely.. was hitting 16psi by 4k and 26+ by 7000rpms. so i decided to order a 39mm flapper and port the turbine housing and enlarge the wastegate port to fit the new flapper . Time for a test drive, MBC completely closed it was 9psi by 3700rpms and 16psi by redline, that was much better, so i set the boost to 20psi but it feels like the wastegate opens too soon once i floor it at around 4000rpm so i only get around 12psi by 4k and 20-21 by 7000rpms not good if u r a GST and are used to roll start . I am using an adjustable actuator from a Garret i tried installing washers between the turbo and the flange so it could be harder for it to open.. and almost the same thing.. I am about to get pissed and do an external wastegate setup but thats a lot of money. I wanna know what u guys think before doing this, Is it bacuse of the actuator , should i keep adding washers? or should i just do the external WG setup (What size what spring)

The only way the car feels pulling hard on lower RPMs it if i set boost to 18 at around 4k but thats around 25+ by 7000(notgood)

Any suggestions?
Thanx
Joel
Mia.Dsm.org


Weird turbo, Big Greddy IC,Walbro 255lph,550cc RC,AFC,3inch full exhaust o2 elimin with dump. 2600pressure plate & Street Disk. Ported Exhaust manifold. Bigger Injectors ASAP......

 

[swordfish]

What turbine wheel?

jeff

 

[GST4U2NV]

tdo6, is what he said

 

[swordfish]

Woops. Maybe I should look a little closer next time

jeff

 

[GST4U2NV]

hey its all good, didn't mean to be a dick either

 

[IPT]

I would recommend sending it to Extreme Turbo they have got internal wastegates to work on some of the largest turbos. There is a certain way that the actuator needs to be positoned for it to work correctly.

Other than that I would say try to open up the hole behind the flabber again.

 

[GReddyGST97]

Is anyone using the 35mm tial gate on a 20g or larger turbo? Will it work good on this turbo? I am looking for a wastegate that i can weld to my manifold without taking out the power steering or having to put one of those really small radiators... Any suggestions?

 

[IPT]

You could do an o2 housing mounted external wastegate. It is better to mount it there. because then you are releasing exhaust from all four cylinders insead of just one.