junkyard turbo build help...

[9]

Ok so i got my turbo today, its a garrett/airesearch, and I don't know how much psi it will run before the wastegate is set to open. I'm planning on getting a link plus, which is probably a little over kill for the setup I'll have, I know I can control boost with this, but does it need to hook up to some sort of solenoid to do this? All I want is about 5-6 psi, for now. should I think about replacing the wastegate too or in place of anykind of boost controller? Thanks in advance.

Courtney

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[Hondaslayer]

Hook up a mityvac to the wastegate actuator,A TD-04 will read around 7 PSI,but only puts 5psi into the motor!???!?!?! How??? I am not sure,Perhaps Darshu can shed some light on it. I am not sure what your turbo will put out,hope I helped.





Oh and Nothing is overkill as long as you know how to use it!


Ben,

[9]

Yeah I figure I just want really good engine management, so I don't break anything. next on my list are bigger injectors. but I'm not sure whate to get there either. So I'll have to get some pics up of my turbo so maybe someone might know more about it.

[ChicksDigWagons]

What kind of car did the turbo come from, do you know? Thats probably the first step in figuring it out. Boost control is done with a separate solenoid unit on the Link, I seem to remember people using the solenoid from the AVC-R. A good injector choice for a 5-6psi setup is a Legacy turbo or a SR20-DET injector. Of course, with full engine management you could set up to even larger injectors right away and be okay. Once you get past the ~370cc injectors you almost have to have a new ECM. (I have a set of new 535cc side-feed injectors for sale if you're interested )

As for a wastegate for example being set at 7psi and the engine only seeing 5psi, its due to a pressure drop through the system. The wastegate is usually hooked up right on the outlet of the turbo, where the pressure should be highest. As the air flows through the intake system, mainly through the intercooler and throttle body, you loose quite a bit of pressure so the boost gauge hooked up to your intake manifold will read quite a bit less than the wastegate sees.

-Brad

[9]

The turbo was out of a volvo wagon, so probably not too high. I've already got some injectors coming since I'm getting a link plus. Thanks for all the info though.

[Darshu]

Hey guys -- In terms of pressure drop on the turbo, I made every effort to make the WRX unit hold as little boost as possible -- I fed the wastegate vacuum source off of the fitting on the compressor outlet, rather than off of the manifold. I then loosened the wastegate acuator rod as much as possible while still keeping enough tension to hold the wastegate flapper closed. Basically, the turbo _was_ making about 7psi of boost at the compressor outlet, but it dropped about 3 psi of boost with my initial, very restrictive, charge pipe and intercooler setup and drops about 1.5 psi now with my less restrictive setup. That's for your standard WRX unit, but the same idea applies to any other turbo.

[STi-Nismo Dood]

whoa, some Volvos does use some big turbos so be-ware. The 2.5T uses a td04-18t/19t that can be easily considered a stage-two on us Impreza owners. Shouldn't the Garrett turbo have the model stamped on your turbo manifold? But I doubt a stock turbo older than '95 would have its internal wastegate spring set anything higher than 7psi.

Originally posted by 9
The turbo was out of a volvo wagon, so probably not too high. I've already got some injectors coming since I'm getting a link plus. Thanks for all the info though.

[9]

When I get home, I'll have to see what kinda numbers and all are on it. It doesn't look too big compared to the dodge turbo's Im used to. later

Courtney

[9]

ok so these are the numbers I found on the turbo,

on the compressor: 41351053

on a plate on the compressor: 5003635
ulr 02164

and thats all, anyone know what this is?
Later,

Courtney