OK, car is up and running with the new A-Spec GT35/40 setup on a new Pinnapple street port engine.
So far so good.
Except even with the control hose removed from the wastegate we can't get the boost to go lower than 15LB.

I'm I correct in assuming the spring in the waste gate is to strong?

It's a TiAL unit that came with the turbo kit.

I have an extra 7LB spring for the TiAL BOV that I am using. Does anybody know of had if that same spring would work in their wastegate?

Thanks

 

Are you sure the lines are connected to the wastegate correctly (pressure source into the bottom)?

 

Yes, thanks.
A-spec has confermed it's a 1 bar spring. So now I have to get anouther spring. :-(

 

Cap'n,

Try attaching a pressure source (manifold or compressor outlet) to the side of the TiAl and leave the top unattached to anything (vented to atmosphere). This way you're applying positive pressure to the wastegate spring to allow it to open sooner and eliminating external boost controller issues. Your boost should be near the the spring pressure. If so, you can focus on boost controller issues.

If boost is still very high then you need to open up the WG and check the color of the spring. You may have more than on spring in there as well. TiAL uses different colors for various spring pressures as well as combinations of springs to attaing the desired cracking pressure. You can also do a boost test with the spring out to see how much the turbo will boost with the WG wide open. Believe it or not, you might get some boost with the WG wide open. If boost is still high, then there is an installation problem or issue with the design- and I SERIOUSLY doubt, if it's an A-Spec product, that the latter is the case.

Go here for spring/color reference : http://www.roadraceengineering.com/tial.htm

Not sure about the BOV spring- give TiAL a call.

Gene

 

Thanks Gene.