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Hello, 

Since my boost solenoid seems to be acting up (80% leads to wastegate pressure and 85 % to overboost) I'm looking to buy a new one. Can you advice me for a simple, reliable, 1.5 bar max boost solenoid valve that is known to work well with the link ecu's without needing additional relay? If possible I would like a silent one because the old one was making so strong sewing machine sounds that it forced me to set 0 target on low engine speeds just so that I don't have to hear that noise. As far as I know the link ECU output port can handle 0.45 amps which is at the limit of most solenoids I find.Thank you!

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3 hours ago, dynoiasi said:

As far as I know the link ECU output port can handle 0.45 amps which is at the limit of most solenoids I find.Thank you!

The Aux outputs are capable of 2A current.  The most commonly used valve is the MAC 3 port, something like 35a-aca-ddba-oba.  They are widely counterfeited though so make sure you are getting a real one.  

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You are right, only the high side drive is limited to 0.5Amps. I got confused. In the end I ordered an  AEM 30-2400 boost solenoid  which looks similar to a MAC 3 port.For those there was a ridiculous amount of fake/cloned ones. Thank you!

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About 0.5 bar... Anyway, after I replace the boost controller I might reach the conclusion that after all this is all this turbo can make. I seem to be able to make more boost in low rpm's and low gears, but it looks like the turbo cannot sustain the pressure in high gears and high rpm's.

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You turn the knife where it hurts :D The problem with my build is that ridiculously I do not know exactly what turbo I am running :) All I know is that it is a T3/T4 hybrid with 60mm inducer and 50mm outlet size. I received it from someone I trusted (back then) when I started the build and he said it should be good for aroud 300hp. From then a lot of money flew into the build and I put together a pretty decent setup, however the capability of one of the main blocks (the turbocharger) is still not know to me.

Update on my work: I installed the new MAC boost controller and started tweaking it on the street. At 90% PWM it looks like I can build around 0.8bar at 6000RPM which is decent for my goals. I get a HUGE immediate overboost when accelerating around 3500-4000RPM even with 70% Wastegate DC. So I guess the turbo is quite small and flows well up to 4000 but then it looses its momentum.

So on the next tweaking session the plan is to try 100% wastegate DC in the high RPM zone and activate the closed loop boost control in order to keep the overoboost tendency in the low RPM's.  Especially if I step off/on the throttle I get immediate boost cut (set at 1 bar).

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