fuel cut maybe? like you need to rewire the fuel pump/get something bigger, maybe bigger injectors?

I dunno man, I'm lost, but then again, losing me is pretty easy

Most likely the boost controller is either hooked up backwards or the Tial wastegate is hooked up incorrectly.

We had the EXACT same symptoms when putting the 2G back on the road.

Is the wastegate opening and functioning normally? If it is, then check for intake or boost leaks.

I've seen it before when people hook up their Joe P backwards and then talk about how they suck. Try switching the in/outs just in case and see if it clears things up.

Other than that its got to be a leak between the turbo and manifold, IMHO.

Did you put both balls back into the mbc? The JoeP uses a dual-ball design.

Did you try and hook the stock solenoid back up? No offense, but you seem to have a rather low tolerance for things not working properly to be owning a DSM. LOL! Hook the stock solenoid back up for now and see if that cures your problem. If it does then it is most likely something to do with the MBC. If not, then it is most likely the wastegate. Good luck!

you need to get one of these.

Is that big enough for a DSM? These cars can be pretty tricky.

ehh the 4 pounder is good for small instances like this. Its not till shit really hits the fan that he'll need an 8 pounder.

I told you dude! Hook the stock solenoids back up and see if it boosts to stock pressure. If it does then your wastegate is fine.

Yes

Connect the hoses to what? If you mean hook it up like it was before you ever even put a MBC in that is what I mean.

yea dude, that should yeald you as much boost as your wastegate actuator spring is rated at.

You don't need to hook it up to the stock solenoid. You can just run a single vacuum line from the compressor outlet nipple to the wastegate actuator nipple.

That depends on what you are trying to discover. It won't tell you anything about the wastegate actuator because with no boost source signal it will never actuate. Its a good way to figure out how much boost your engine can take before utter destruction though. In other words, either Joe P was TOOHA or you misunderstood him. You never want to run without a boost signal to the WG actuator especially on a turbo as large as yours. Very dangerous.

But he has an aftermarket wastegate actuator. I'm assuming this means he has a much stiffer spring which means he could also run too much boost with the actuator spring. I dont have any experience with aftermarket wastegates, but shouldnt this be right? I know my stock actuator's spring held up to ~15 PSI.

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bad picture??
did you save it right?
it did that to me with a couple of things i wanted as my avatar but then i found one i liked and it let me?? i dunno

All the stock solenoid does is divert some of the pressure signal to the intake. Since it is taking signal away from the actuator it would actually cause his boost to rise to a higher level than what the actuator spring is set for. There is no way for the solenoid to increase the boost signal to the actuator. The lowest maximum boost a properly running turbocharged car can see is whatever the actuator spring is set at. So simply running a vacuum line from the boost source at the compressor outlet to the WG actuator nipple is the surest way to run that lowest maximum boost.

This is of course assuming that his actuator is functioning properly. If it isn't it may open way too early or it may not open at all. Going by the starting post of this thread, I'd say he is either running on a healthy actuator spring pressure of 12 to 13 psi and the mbc is just not working, or the actuator is malfunctioning and opening the WG too early. Trying a different mbc may yield some answers or running a vacuum line directly from the boost source to the actuator may help. Running the vacuum line back to the stock boost control solenoid just adds to the complexity and isn't necessary IMHO.

Another thing that Spy mention earlier is checking for boost leaks. This could very well be your problem.

I got your message. Looks like we're all getting together on Saturday for some lunch and I imagine some of us will be hanging out in the evening too. Drop by and we should have plenty of time for some tuning. See this thread.

http://www.dsmcentral.com/invision/index.p...opic=1534&st=30