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I'll try to explain the problem I am having as best I can. Hopefully someone can help out.

I currently have the HKS-EZ boost controller and the new SP-70 turbo kit w/ HKS 60mm wastegate.

In short, we know the wastegate spring is a 1.5 bar spring, because with the hoses pulled, the car pulls 1.5 bar running just off of the wastegate every time. Now, we are 98% sure the EZ is hooked up correctly as all 4 people who have looked at it and installed one themselves have inspected it. The solenoid is clicking as well and there are no vacuum leaks. We also swapped a solenoid for another one yesterday, and got the same results.

Now for the problem...

The car pulls 1.5 bar on the dyno with the EZ at the 7 o'clock minimum position. You would think with such an aggressive spring, the EZ would be extra sensitive and a slight turn should crank up boost a lot. However, I have to go to 12 o'clock to get to even 1.8 bar on the dyno. Then the fun ends. Even if we bury the EZ to the 5 0'clock position, we still get 1.8 bar. So it's like the EZ is working but is extra insensitive, and won't run past 1.8 bar at all.

Peter B. has told me the EZ is supposed to correlate with the wastegate spring in the neighborhood of 250%, meaning this spring should be capable of 40psi or so. So then, why is the EZ being so insensitive? And more importantly, why are we being limited to 1.8 bar when we should easily be able to get 2.0 bar on the dyno?

Any help is much appreciated as even some of the more knowledgable Houston guys I know are stumped on this one.
 

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i used to have hks ez on my supra. i get about 25psi when ez is set at 12. i also ran 30+psi with ez and i never had any problem. check the switch behind the ez. make sure to set it for external wastgate.
 
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v8huntr said:
i used to have hks ez on my supra. i get about 25psi when ez is set at 12. i also ran 30+psi with ez and i never had any problem. check the switch behind the ez. make sure to set it for external wastgate.
Yes, the switch is set correctly. And yes, it should run 30+ psi with no problem.
 
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