You won't be able to hold 25psi with the stock turbo. The BCS system with pill is perfectly capable of doing this but not the turbo. YMMV.

 

Jeff -- I hit 30+ with the inline bleeder to the BCS...

 

^^^

I'm bringing this back because I need some additional explaination about TBEC.

My Setup: I removed the BCS pill. I filled it with solder and drilled it out with a #65. I then replaced the the stock turbo pill with the modified BCS pill.

Results: I zero'd out TBEC, set boost correction to 100, and modified my WDC to something with 90's down low and up high with 50s in the middle. This provides me with 23 psi for as long as the car can hold it. Nice.

It should be noted that moving from 50s to 70s really ramps up the initial and midrange boost levels. None the less, running 100s at 6500+ doesn't provide higher than 22 psi.

Question:Earlier in this thread it was reported that the TBEC almost functions like gearing. The first four blocks are first and second gear and the last four blocks are fifth gear. I'm not sure if this has been confirmed or not. If I understand that correctly (I could be wrong) then I should be able to run zero's up to the last four blocks and then enter something like -20 to elminate the high gear high load creep ... correct?

 

I've looked at this part of the ECU code in detail. The ECU wants to maintain a specific load regardless of what gear is selected. Changing the TBEC numbers only affect how well the ECU can maintain that target load. Perhaps fiddling with those numbers may result in different loads in different gears, but it would be unpredictable.

Now if you are talking about a tendency for higher boost in higher gears, there is nothing that can be done about that with the current system. That gap between load and boost is large in lower gears and shrinks in higher gears. The only solution for consistent boost across the gears would be a direct boost controlling system.

 

^ Thanks for the reply. I may perform some additional testing. I didn't want to reinvent the wheel if someone had already done it.

Next Question: Is there any harm in ONLY using the WGDC to control boost? Can any harm come from setting TBEC and boost correction to all zero's?

I know that it will be much like an MBC where I am required to adjust for weather changes but other than that it appears to be a clean solution.

 

No prob. I ran like that for 3-4 months.

 

May be an easiest way will be to start with
How to control boost on near stock car (with tbe exhaust ) without solenoid restrictor?
May be it will be a way to understand how it works at all.
May be someone how can find the best way to control boost in this conditions can post here his setup.
My 5 cents
On car with tbe exhaust with stock restrictors i cant rise boost by any modifications.( 1.4 to 1.1 with 1.5 in peak )
But after i'v removed solenoid restrictor with 90 WGDC i hold 1.55 to 1.2 -1.3 at redline. But have wavy boost overboost on high gears an some knocks from 1 to 5.

 

My 9 has only a TBE and TUNE. With the #65 pill and midrang 50% WGDC I see a 23 spike and 21 hold. If I ran 100% across the board it would spike to nearly 30psi.

EDIT: Dyno'd yesterday with only the ECU controlling boost. Need to add a little midrange boost to the pump gas tune but the race gas tune is perfect until the turbo runs out of wind.

 

I've been trying to dial in my boost curve. Every session I log I have the same load fluctuation. You can see the waver on my dynos. The problem is the scaling on the WDC table is broader than I would like.

I was wondering if there would be an issue with editing the scale of the table. Allow me to explain. I would like to remove the 1000, 1500, and 2000 rows. My scale would start at 500 then jump to 2500. All of those cells are marked at 100. I dont really need 5 cells with 100 in them. I would rather add cells to the meat of the power band. Maybe a 4250, 5250, and 6250 for fine tuning.

Can I manipulate this table without breaking a reference from another table? Is the a dependency that shouldn't be modified?

 

Yes, it's safe to adjust the MWGDC scale... in fact, it's recommended.

Here's my stuff (keep in mind I'm using direct boost control via JDM MAP, so these aren't numbers you should use:

 

Changing RPM in the WGDC tables changes it in the BDEL tables as well. This is perfectly fine and can be done. I rescale most of them and it does help for fine tuning.

 

nice thread...

 

great write up. ill be doing this mod.

 

Do you have any mechanical modification for boost control ? or you control the boost only from ECU ?
If I will install a greddy boost controller to control the boost then how should I set the boost maps with ecuflash ? or they won't have any effect with the boost controller installed ?
Thanks !

 

I have put a pill (on USDM EVO 8) from subaru which have a smaller hole, now I have 23psi and it gradually drops to 18. I should use a pill with a larger hole or I have changed the wrong pill ?
...also I don't have the baseline boost map in ecuflash...