So, this may be a dumb question, but I can't seem to figure it out.

If you have twin turbos, especially those with an internal wastegate like the JWT 530bb's, do you need two seperate boost solenoids, or is there a way to do it with a single solenoid? How does the vaccuum/boost line plumbing look?

 

Only one is necessary. Just 'T' the two wastegate lines together and use one turbo or the intake manifold as your source.

 

Here is a diagram for twin internal gates. Your solenoid ports may differ.

 

Thanks for the help, sent you a PM

 

Dave,

Nick will be making two maps/boost levels for me. Using the UTEC Map switch I'll be able to change the boost and the map that's needed for that boost level. Thinking of upping your boost?

Parts needed;
- UTEC Map Switch
- TurboXS DTEC Map Sensor
- Perrin Boost Solenoid

 

Robert, why are you going with a Perrin boost solenoid?

 

the jwt compressor housing do not have a fitting for boost pressure. so you will have to run it to the nipple on the front of the intake manifold

 

You mean for the mainifold air pressure (boost level), right? Not for the wastegate fittings...

I've allready got a seperate vacuum/boost manifold I use for a number of different sensors, so thats not a problem.

 

I'm switching out to larger injectors, and going with the Haltech ECM, so I will use it control the boost. Only going to go with 8 PSI, I just want to get something controlled by the ECU rather than relying on the wastegates.

 

yes for boost pressure

 

external wastegates requires 2 lines, one for the top nipple, and another for the lower nipple. heh, i said nipple

 

Sweet! Looking forward to hearing your results. I'm holding back on buying another EMS till I get to Texas. No point to pay for 3 different dyno tunes.

 

Is there any benefit to running two seperate boost solenoids, one for each turbo, taking rhier pressure from the same source, but connecting the output line from solenoid 1 to wastegate 1 and solenoid 2 to wastegate 2? This would shorten the boost lines, which may or may not give any advantage....

Also, will the Haltech control two solenoids (in parallel), given that I am at some point able to resolve my closed loop operation issues, that is?

 

I don't think running 2 solenoids would be of any benefit. Different waste gate springs may be of benefit by reaching boost quicker. I think controlling the boost levels from both turbos together at different loads is more important. So 1 proven/reliable boost controller whether it be electronic or manual should be perfect. I've heard that the electronic boost controllers are sensitive and prone to boost spikes & glitches but there are tons of members here that swear by them. I'd rather keep it simple, so I went with a manual.
I'd like to know how efficient controlling all of these accessories off of a 1/4 inch NIPPLE is?

 

If the source for the boost pressure is at the manifold (i.e. after output from each turbo is combined), I do not see any great advantage for running two solenoids (I recognize that the intake piping on the JWT kit is asymmetrical, but I don't think it makes a huge difference in where each turbo operates on its compressor map nor do I think slightly shorter tubing will make a huge difference for boost control).

What closed loop issues are you having? Closed loop boost control or closed loop O2 feedback? I'd like to know what all the parameters mean for closed loop boost control on the Haltech... (never tried it)