Pressure drop across IC??
 

I have the vacume line for my internal wastegate coming off of my compressor housing. I was told I will loose 1.5 psi across my intercooler...is this true? I'm sure it depends on the size of the IC...i've got a 30X6X2 inch core size intercooler(tyrus intercooler).

Assuming my internal WG is set at 8psi, with the intercooler, would my engine only be seeing 6.5psi???

Thanks

Re:Pressure drop across IC??
 

Well, the compressor has no vac, just boost. :P You won't find vac until after the throttle body.

Let me guess, you don't have a boost gauge? :-\ Eek, be careful. Normal pressure drop is around 1psi and could be as much as 2 or 3 depending on the design and size. If your wastegate is set at 8psi then your motor is probably only seeing 6.8psi or something in that area. I would get a boost gauge to be safe.
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Re:Pressure drop across IC??
 

I do have a boost gauge...I just don't have the turbo on my car yet. I'm just trying to determine if the WG I have is too big or too small before I put it on my car and find out I have to get a different one.

I just don't want ot put the turbo on my car with a 8psi WG...expecting 8psi, and only seeing 6.5psi.


And I guess I should have said the boost tap on the side of the compressor that is connected to the internal WG...my bad.

Re:Pressure drop across IC??
 

Oh, I see. You can always build a $3 boost controller at HomeDepot. It's in the FAQ if you are interested.

BTW, I was just messin' with ya about the vac thing. :P
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Re:Pressure drop across IC??
 

I thaught about the boost controller...but that only works to raise boost. If I have a 12 psi WG the boost controller will do me no good if my goal is 7psi.

thanks anyway.

Re:Pressure drop across IC??
 

Oh, well you said you didn't want to expect 8psi and only see 6.5psi, which a boost controller would fix. What wastegate actuator do you have? An 8 or a 12? ???
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Re:Pressure drop across IC??
 

I'm not sure...I've got a garrett T3 with a .42/.48. There is not a part number on the turbo. I was told it came off of a saab or a volvo, which probibly is set at 12 psi. I haven't done the actuator test to it yet...but will soon.

But your right, that would work. I'm just trying not to sound like a newbie ;D

Re:Pressure drop across IC??
 

Lol, you had me fooled. ;) You could always bend the actuator rod to lower the compression, but that sucks because you also raise the lag. :-\ I guess it all depends on what your actuator is going to allow the turbo to boost.
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Re:Pressure drop across IC??
 

Yeah, i've already been through that arguement on a seperate post about adjusting the threads on the actuator rod to adjust boost, and like you said I don't want to increase my lag while trying to lower my boost.

Thanks for all of your help though.