I'm running a Garret T3/T4 Hybrid turbo on my S5 short-block with everything else from an S4, including the switched out OMP/eccentric shaft cover, blah blah blah..



Anyways! I don't have a boost controller, but I've got a Racing Beat 3'' down-pipe, 3'' high-flow cat, 3'' Racing Beat Turbo-Back dual exhaust, Walboro 255, Vortech Fuel-Pressure Regulator, and RC Engineering Blue-Printed Balanced Injectors which I believe are basically just upgraded stock injectors (they still say DENSO on them).. Oh yeah, and my ECU has a fuel-cut defender that has been programmed into it already.



My question is, with the stock wastegate on that turbo, what do you think the boost will be at? I am scared because I have no boost controller, and I don't wanna blow the motor. With my core being S5, and everything else being S4 along with the mods I listed, what's the highest boost I can run SAFELY without lessening the life of the motor drastically?



Here's a pic of the bad boy while it was off the car during the whole motor-swapping process that my brother and I are almost finished with..

In my experience if you get .5 to .7 kilos of the actuator you will be lucky. I have had lots of problems with the boost falling off in high RPM's with the Hi flo turbines.



Since the turbine is S5 boost creep will not be a problem as are the S4 types. Are using a FMIC? If you are then your boost without a boost controller will be even lower due to the pressure drop. As far as maximum boost you can run most of the Hiflo's I have used wont do much more than1.2kilo or 16psi. Anything above that is just a waste of time. I am not sure what size your injectors are now but without some tuning you will need to run at least 680's in the secondaries for that much boost.



Good luck

My signature lists all my mods. The injectors are stock S4 Turbo II injectors that have been blue-printed and balanced by RC Engineering for fuel efficiently and better flow.

Uh, that looks like a compressor upgrade or hybrid to me.

So it can't be a T3/T4???



The stock wastegate is sprung for 6psi, so with creeping (most likely with your set-up) it should hit 10psi easy.





-Ted

T3 compressor housing T4 exhaust housing = hybrid



The stock wastegate is only allowing for 3 1/2 psi as I said, it's smoothe and doesn't leak at all. I need some type of boost controller to turn it up to 10psi though. :/

What you are seeing is a common thing with Hi flo turbines. I am not exactly sure why but they just don't seem to boost. Even if you get a boost controller the boost will fall off at high RPM. You can modify the actuator as I mentioned in the 2nd gen area earlier.



This is the "modifictation" that I just did on a S5 car with a High flo.

Huh?

No T4 comes internal wastegate.





-Ted

T4 exhuast with a T3 compressor...WTF?

OK OK so I don't know how the f*ck it is what it is! >_<



But what I do know is, the car is running a solid 4 psi, with no boost controller. It semes it should be higher, but the stock wastegate is very small, I don't know. I have to have my brother explain this **** to me since he drives an SR'd 240. I hardly even know what .70 AR on my turbo means! ;_;

If you're not running an Autometer boost gauge, it just means you have a nasty restriction somewhere - and that's not normal.



It's possible your high-flow cat is disintegrating.



You could be running too rich (why are you running that Vortech FPR?), and that can be surpressing boost.





-Ted