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Boostin' The T3/t4 Hybrid

Old 04-17-2004, 09:23 PM
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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..
Attached Thumbnails Boostin' The T3/t4 Hybrid-fc3s___turbo__02.jpg  
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Old 04-18-2004, 11:09 PM
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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
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Old 04-23-2004, 01:28 PM
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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.
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Old 04-23-2004, 06:15 PM
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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
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Old 04-25-2004, 11:16 AM
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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. :/
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Old 04-25-2004, 06:11 PM
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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.
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Old 04-25-2004, 11:44 PM
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Originally Posted by Lionheart240' date='Apr 25 2004, 08:16 AM
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. :/
Huh?

No T4 comes internal wastegate.





-Ted
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Old 04-26-2004, 08:13 AM
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T4 exhuast with a T3 compressor...WTF?
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Old 04-27-2004, 01:20 AM
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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! ;_;
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Old 04-27-2004, 01:12 PM
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Originally Posted by Lionheart240' date='Apr 26 2004, 10:20 PM
But what I do know is, the car is running a solid 4 psi, with no boost controller.
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
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