JeffR116

iTrader: (3)

I got my cable today. I download my 9 rom, and was checking some of the tables.

I was planning on going stock for my next Auto-X, so I took off my MBC and put the stock wastegate solenoid hoses back on. With this configuration I was only able to boost to .8bar, no more. I chalked this up to something Al changed on the boost settings since I was running a mbc when he tuned me. I'm sticking with my mbc until support for flashing the 9 ecu arrives.

Here's my boost settings from my map:

Wastegate solenoid De-activation RPM Re-activate: xxx
Wastegate solenoid De-activation RPM De-activate: xxx
Wastegate solenoid Activation RPM De-Activate: xxx
Wastegate solenoid Activation RPM Active: 281 (That's gotta be kpa, or wtf)

Wastegate duty #3 looks modified slightly, but #2 and #1 are both the same.


================================================== =======


So then I got to thinking about another issue....

The stock hoses run in an odd configuration. Couldn't we just run a single hose from the wastegate to one side of the solenoid and then another hose from the turbo nipple to the other side of the solenoid?


Since the solenoid opens to allow air to pass from one line to the other, In effect, with the right boost solenoid map activation settings, this would act as a ebc, correct?

I know the white painted side of the solenoid lets pressure out, so it's easy to setup the hoses, but what setting would I need to change under my map to make this work? Seems like it would be very easy to configure.


TIA,

Jeff

mchuang

iTrader: (11)

I do not think the evo 9 can be modified just yet. They are still working on the 8 and once perfected the 9 will probably be easier also. I read this information in another post.

JeffR116

iTrader: (3)

Thanks, but I know that. You can modify the maps, you just cant flash it back to the EEPROM yet.

kf6ytc

iTrader: (10)

The stock hoses have to be left in exact oem tact for the intergral boost control to work.... the stock lines have restrictor pills, etc

No, this is a bleed off type system, the wastegate and turbo are t'ed together and then bled into the intake.

dryad001

iTrader: (27)

I have a completely stock 9 map if you want it to show you the difference in the 2 maps. No immoblizer code though.

MalibuJack

iTrader: (5)

This is offtopic, but the reason it won't work is because the stock solenoid is "Normally Closed" which would cause overboost if you just put it inline as a restrictor system and not a bleed system..

You are correct, the restrictor pills have to be left intact to get the levels of boost you would expect.. The first pill (from the boost source to the T) sets the lowest level of boost, the second restrictor in the bleed line to the solenoid sets the high level.. When the valve is open, the additional air is bled through the valve and the boost level raises.. There is a slight range of boost that can be controlled using solenoid duty, but the solenoid itself isn't designed to be used for fine control and therefore we have limited control.

Theoretically, if the boost control maps are indeed useful duty cycle values, or even load target values, then you could switch to a different solenoid (ASSUMING YOU MATCH THE IMPEDENCE OF THE STOCK SOLENOID, its important because if you don't you risk burning the solenoid driver on the ECU, or your solenoid, or it overheating and melting something, this info is posted elsewhere)


I keep thinking that there may actually be gear based boost control in there somewhere.. I do see 4 of the Max Wastegate Duty tables, and 4 boost desired engine load... It leads me to believe there may be something to that..

JeffR116

iTrader: (3)

I thought there was only 1 restrictor in the line from the T to the solenoid. I had changed the tubing that runs from the turbo nipple to the T, which is why I'm only getting .8 bar. Makes sense.

Thanks for the explanation. I appreciate it.

MalibuJack

iTrader: (5)

Yep that is the most common reason, sometimes when people put the hoses on reversed where the restrictor is on the Actuator side instead of the pressure source nipple they will get wastegate pressure, or maybe a little higher..

speed kills

iTrader: (2)

I have question about, how to stop the boost to drop from 19psi to 16psi at higher RPM, Is there some setting which i can change to do that. The car has no boost controller.

JeffR116

iTrader: (3)

You need an upgraded wastegate actuator to hold boost solid to redline.

MalibuJack

iTrader: (5)

Its actually an ECU feature.. Peak 19psi dropping to 16psi is the main function of the solenoid..

I think tis the Wastegate Solenoid Activation RPM settings.. I have an MBC on the car at the moment so I didn't play with it too deeply..

supersupra

iTrader: (8)

So if we remove the solenoid the boost could stay at 19?

MalibuJack

iTrader: (5)

No removing the solenoid would result in a disconnected solenoid and nothing connected for boost control.. Not sure what you mean..

You can use an MBC and set it manually to 19psi (or any reasonable setting for that matter) or you can alter the settings in the ECU to remove the tapering feature.

speed kills

iTrader: (2)

Okay i will do that.

supersupra

iTrader: (8)

ok, that is what I need, how do I remove it? (I have ecu flash)