Eboost 2 Problems

[Argumentative]

Hey,

First of all let me say I am new to Turbo charged vehicles, so don't really know what I'm talking about 90% of the time, but I'm keen to learn more as I have recently purchased a Black R32 GTS-T and am loving it!

Onto the problem at hand, I have as mentioned, an R32 with the RB20DET in it. As far as I know (3rd owner since import) running the stock turbo/wastegate, no BOV and an e-boost 2 boost controller.

Basically, I have no idea if I'm doing something wrong, or if there is something faulty with my e-boost 2 / solenoid, but I have found as I increase either the SP (Set Point) or GP (Gate Pressure) results in a drop in Max boost.

I have tried the following configurations:

(Sensitivity was left on factory default 20, only SP and GP values were changed)

BG1: SP 0, GP 0 - Makes 12.1 PSI boost,

BG2: SP 20, GP 3 - Basically what the setup instructions say to start out with, makes around 11 PSI,

Have slowly (5 SP at a time) worked my way upto the following, which shows almost no difference in boost:

BG3: SP 50, GP 9 (3 below my target, 12 PSI), makes approximately 10PSI.

I have the OBS (Over Boost Shutdown) set to 14.2 PSI, I read somewhere 2.2PSI above the desired boost was a good place to set it.

I have heard the factory wastegate is good for about 12PSI, which seems to line up with my BG1 result, I have had a look at the solenoid setup, it appears to be connected as per the setup instructions (but then I have no real clue, just going off generic diagrams), will try and take some pics of how it's connected in a min, altho with only an iPhone 3G camera, that may prove futile.

If anyone has any thoughts on what I can check, or worst case, where I could take it to, it would be much appreciated.

Edit: I should add that I have no idea who installed the e-boost 2, was in the car when I bought it a couple months ago.

Edit2:

Here is a pic of the solenoid, courtesy of my awesome MS Paint skillz, I have drawn a circle around each of the ports, with the colors matching the other shots:

Here is the other end of port 1, this is on the same hose as the vacuum line for the e-boost 2:

more 'overall' shot of where this is, if it helps:

Here is the other end of port 2:

And finally, the other end of port 3:

The instructions say that polarity is not important on the 2 wires running from the e-boost 2 to the solenoid, so I'm assuming from that, there is no way they could be reversed and causing my issue..

Edited March 29, 2011 by Argumentative

[Argumentative]

No one has any ideas/opinions on this one?

[Shane_954]

The way thats hooked up you've got 2 pressure sources so the solenoid cant bleed.

Disconnect the red hose from the plenum and run port 1 to where the yellow line runs to the compressor cover. Forget about hooking port 3 to anything at this stage and see if it works.

[Moodles2]

Mac valves should only have all 3 ports in use if using a external gate, since you're using internal gate 1 of the ports need to be exposed to the atmosphere in order to bleed air to up the boost from stock

[Argumentative]

Hey,

Thanks for the replies, will go and give that a shot and report back soon!

[Argumentative]

Soo,

I did as suggested, port 3 now has the length of hose that WAS connected to the plenum (Red in the above images), the other end of the hose is not connected to anything.

Port 1 (yellow above) is now connected to the compressor cover. Port 2 (blue) I ddin't touch.

Results:

(again, only SP/GP were touched, Sensitivity, OBS (14.2PSI) etc left alone)

SP 20, GP 10 = 28.? PSI (tried this one first, as it was the 'default' as suggested by the instructions, OBS kicked in thankfully and probably saved my RB20...)

SP 00, GP 0.0 = 23.8 PSI (Once again, TY OBS!)

So, basically, now I'm over-boosting like crazy, car does feel more responsive... But damn, that can't be good for it..

Will start researching Over-Boosting, but as always if anyone can link a thread or offer some more suggestions, it would be much appreciated!

[Argumentative]

Just re-read Moodles2's comment above, will try switching ports 1/3 (so 1 is venting, 3 is Compressor Cover) and report back.

[Argumentative]

THANKS Moodles2!!!

Your advice was spot on.

running:

SP 20, GP 10 gives 12PSI max, probably have a little room to bump the SP up, but I can screw with that later. And with GP set there's a noticeable reduction in spool time!

SP 30, GP 11 gives 13PSI, finally going in the right direction!

Not really game to take it any further, will need to start looking into what other mods I should invest in, but I know there are already 101 good posts on this, so time to go back to reading up!

Thanks again to both shane_180sx and Moodles2, much appreciated.