I have a Eboost2 with a single solenoid on my TT car but I see instructions for using two. Under what circumstances would two solenoids be needed? What issues would the second one help with?
Ahh.. Not at all what I was hoping for so it looks like I have more trouble shooting to do.Well, if it works anything like other boost controllers, you have one solenoid that controls the wastegate on one side and another that controls the other side. This should allow you to run without a spring and control the gate via a 'virtual" spring.
Not much, just check all connections. There is a Check Solenoid test I will try this weekend if I have time. The only program setting I changed from last year was to change the duty cycle from 60 (which gave me 25psi boost) to 0. I even tried 10 but nothing helped. Last year 25 gave us 18psi boost. I even lowered the gate pressure to try to ramp in the boost reeeaaally slow but it never made a difference.What do the directions say? I would think there would be some sort of discussion of how the system works..
The CO2 is definitely the way to go if you can afford to. It's so consistent and steady compared to compressor signal. I bought my friend a CO2 setup for his turbo car as a wedding gift and it included a 5lb bottle. He street drove and strip drove it for like a year or more and never needed a CO2 refillThere are several ways to run gate control solenoids or pressure valves. In a car that is not a strip-only car, you really want to run a spring and just use the dome pressure (or leak off compressor sample pressure) to increase boost above the spring. Dual valves are always more stable unless it is a straight compressor sample bleed system (which often is not that stable anyway) where you just bleed off some compressor boost reference sample to trick the waste gate.
Waste gates tend to leak before reaching opening pressure. Simply bleeding the compressor sample signal off to atmosphere might not work so well, because the exhaust pressure can push the gate open and not give a stable boost pressure.
If you use CO2 (or some other pressure source), you can force the waste gate closed to seal the wastegate tight. The CO2 just augments the spring. With CO2, the system uses less CO2 and has much better control with a dual valve system, where one valve adds dome pressure and the other bleeds it off.
I use CO2 with dual solenoids (bleed and charge) to the dome and a 12 psi spring. That way I can dial any boost I like over 12 psi. It goes a long time on a bottle at the track. I've gone almost a season now and still have almost full CO2 pressure.