Can you guys tell me if my wastegate is in the wrong place i have a tial 38 mm wastegat i am getting crazy boost spike do you think if i get a bigger waste gate can i put it in palce of the old one or should i weld up the hole and put in the center of the manifold

 

Its not a great design or anything but i dont think it would spike with everything else set up correctly.

 

well it did boost spike on pump gas to 22 pounds at 6500 rpms and woud of kept going and on race gas it went to 26 pounds at 6500 and kept going also so my question is in the right palce or do i need to move it and get a bigger wastegate

 

what kinda manifold is that?
also i would recomend getting a real tial wastegate. if you need one let me know, i can get you a good deal

 

it is a kooks torbo manifold and it is a real tial 38mm but i do need a price on a tial 44mm

 

Looks like you welded in taht wastegate arm afterwards correct? Could try using a larger ID pipe and also have it pointing upwards a bit so the exhaust gases flow into it easier other then straight 90 degree. Also, recheck your dump tube. If that is amde poorly. that will cause boost spike as well

 

thats the old 35mm tial they dont make those anymore try the 38mm tial

 

How long is that vacuum line going from the wastegate to the boost source?

You wanna keep that line as short as possible and with no kinks. You also want it to be clamped on. The wastegate actuator is boost pressure operated, so that means that line is pressurized. I'm surprised it hasn't popped off yet.

Either shorten the line and clamp it down, or run it directly to the compressor. With a hose going right to the compressor your boost wont go as high as your spring setting because the actuator opens a lot quicker. Does the compressor outlet have a nipple on it for a vacuum hose?

 

The fitting on the wastegate there is a barbed fitting, there is no need for a clamp as they will never slip off the barbed end. I've never seen that atleast.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tchleung &raquo;</TD></TR><TR><TD CLASS="quote">The fitting on the wastegate there is a barbed fitting, there is no need for a clamp as they will never slip off the barbed end. I've never seen that atleast.</TD></TR></TABLE>

...and if it does slip off then you're looking at a possible blown motor because the wastegate is no longer controlling the boost. Why risk it? I'd rather pay a dollar for two tiny hose clamps rather then several thousand dollars for a new motor.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by BlueShadow &raquo;</TD></TR><TR><TD CLASS="quote">
You wanna keep that line as short as possible and with no kinks. You also want it to be clamped on. The wastegate actuator is boost pressure operated, so that means that line is pressurized. I'm surprised it hasn't popped off yet.
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Good eye, I was just about to say that. You really need to clamp that on bud. That's 22 psi going through that thing, barbed or not it's gonna expand.

 

you can run 2 waste gates if u have too, and concerning the motor blowing up from over boost, dont u guys run a boost cut?

 

the turbo looks to be a T4 is it ? , And you should probly add another wastegate also or get a bigger one , you also need a min of a 6mm id line going to the wastegate

 

it is a tial 38mm

 

it is running from the wastegate to the golden eagle vaccum block

 

yes i do have a boost cut it is set at 8 pounds until i get this problem solved

 

yes the turbo is a t4 pt61 what i am thinking about doing is closing the one hole in the side and running it out the middle of the header and putting a tial 44mm on it

 

u sure the wastegate is opening?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by racinskittle &raquo;</TD></TR><TR><TD CLASS="quote">u sure the wastegate is opening?</TD></TR></TABLE>

how do i check to see if it opens also i was told by the tuner that the wastegate is to small for the turbo i have

 

ya it might be hard since that turbine flows so well. Seems like it wouldnt spike that bad though. I guess you could just stick another tial on the other side.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crxvtecturbo &raquo;</TD></TR><TR><TD CLASS="quote"> Can you guys tell me if my wastegate is in the wrong place i have a tial 38 mm wastegat i am getting crazy boost spike do you think if i get a bigger waste gate can i put it in palce of the old one or should i weld up the hole and put in the center of the manifold

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here's one of full races manifolds that is ran off one cylinder,but it is a much larger pipe tho

http://www.full-race.com/catalog/images/s2000.jpg

 

bump

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by crxvtecturbo &raquo;</TD></TR><TR><TD CLASS="quote">it is running from the wastegate to the golden eagle vaccum block</TD></TR></TABLE>

well, like I said you want the wastegate line to be as short as possible. The shorter the line the sooner the wastegate sees boost and starts opening to bypass the exhaust flow. If you wanna rule out your manifold or wastegate as a problem, try running the wastegate directly to the compressor outlet. You didn't mention if you already had a nipple at the compressor outlet. If not you might wanna think about tapping a hole at your compressor or the comp outlet and put a nipple there.

Something like THIS. Remember the sooner the wastegate recieves boost from the compressor the more responsive it will be. If you have your wastegate hooked up to the compressor and you still get a small spike then the wastegate placement or the piping size probably is bad.

 

Every kooks manifold that i have ever tuned has had significant boost spiking issues. This is doing the SAME exact thing as the others. Small wastegate, single runner placement and large turbine/housing and less backpressure is always going to spike. The wastegate is opening, the boost pressure curve looks exponential in boost vs rpm. There is a reason that FR uses larger wastegates, or dual wastegates with large a/r housings and large turbine wheels.

 

so what size a/r exhaust housing does this really start to be a problem?