Increasing boost with internal gate

[l1ttle_d3vil]

If I'm wanting to increase the boost of a standard T28 by using electronic boost control and sticking with the internal wastegate, what is a "safe" limit I could increase it to while allowing it to vent easily?

I've heard of people running 15psi on the internal gate with very minimal spiking (and thats using the VERY old link ecu's, which apparently are no good for boost control).

Would this be on the limit, or could I go higher?
would it be worth it to bore the gate out a bit to allow more airflow or would the gains from that be minimal??

thanks

[tsoob]

get an external bro, they cheap as now and way better at the mid range boost 14-20 psi

[samlloyd]

Not the same turbo, but i had 18 odd psi kept undercontrol by an internal on my old Mazda Familia.

Now on my RB, its got a t3/t4 on it, and the internal wastegate couldnt keep up. Got the wastegate hole bored out just a bit less then the flap (about 9mm!) and it holds boost ok now.

Although in near future, the wastegate/turbo is whats limiting power. Depends how much your after if you want to go external or not.

And price too, genuine orrr?

[DexGT]

I'm running a GT25 and it is standard and I am running 20PSI controled though the internal wastegate so 15psi should be fine , only one real way to find out though

[escortman]

cheap externals are fine so long u take out the shit springs and put a good quality one in, im going to see how far i can keep internal gate for

[mister2]

Internal gates are perfectly fine for what you want to do.

You don't need a big wastegate. Porting wastegates and going to externals is only if the internal can't hold boost *below* a certain level. Whereas yours is presumably fine at spring pressure?

If your stock turbo creeps at spring pressure (see Redmist's offroader) then that is when you need to start looking at externals or porting wastegates.

[touge rolla]

an HKS actuator is a relatively popular upgrade on T28's
http://www.hksusa.com/products/?id=665