Ok so I took off my AEM EBC today to return to stock boost because I was getting tired of throwing overboost codes everyother time I stomped on the gas! I would throw two sometimes three codes...p0135 or p0137 (can't remember) p1345 and p1870.
I hook all the vacuum lines up back the way they came and went on a test run only to find out that I am now only pushing 13psi!!! WTF!!
the only thing different that I did from stock is I did not put the boost pill back in the line, I didn't think that it was really needed! I reset my ECU and went on another run and still only 12-13psi!
My mods are as follows...
K&N cone filter
HKS exhaust and center pipe
ETS DP with o2 dump and ETS TP

If anyone has any suggesstions for me that would be great because this car is incredibly slow on 13psi of boost.

thanks guys!!!

 

Uh..... the boost pill is there for a reason. Changing the diameter by hundreths of an inch significantly changes how the system operates.

 

There are 3 pills on the EvoX boost control system. The main one that is in the vacuum line from the turbo outlet is there to restrict the amount of pressure that reaches the actuator. Removing this one will decrease your boost since more pressure will reach the actuator causing it to open.

The other 2 are before the boost control solenoids. Removing these will actually increase the boost since more pressure will be allowed to be relieved by the solenoids. The more pressure that is relieved, means the less pressure that will make it to the actuator which will increase the boost.

 

where do the three pills in the vac lines go?

edit: I only remember taking one out.

 

Read my post again

 

so if I install the pill between the turbo outlet to the actuator and leave the other two out and just keep an eye on the boost you think that I will be fine?

 

Put the main pill back in (from the turbo outlet) and leave the others (before the solenoids) in place. If you remove the pills in front of the solenoids, your boost will jump too high. If you want to remove those, you'll need to lower the WGDCs.

 

OK so I put the main pill back in (line off hot pipe) and left the others out (don't remember what I did with them, must have thrown them out) and now I can get up to about 18 psi but in the higher gears like 4th and 5th where there is more load! second and third only put out about 16-17psi. Also there are no boost spikes what-so-ever. It's not like I stomp it to the floor and the boost spikes at like 25-26 then tapers down to 20-21...not at all (this is how it was with the EBC), now the boost kinda slowly rises up and when it hits between 16-18psi it holds it there, which is good but still a little low! What is the next step I should take now?

 

bumpin it up for some boost!!!

 

I am having boost spike issues(22-23psi @ peak torque) and I came across this thread... My car has all three pills in but my car is still overboosting... when i log load on evoscan i notice at this boost level i am near boost limits on the stock map...I compared all the boost tables to a stock rom and it is all where it should be... Any ideas would be great right now

Attached is the Evoscan Data log

 

Its to my understanding that tampering with these pills usually leads to problems down the road? Thoughts? Are people just keeping these in place?

 

nothing wrong with messing with these pills ..

Like SiC mentioned .. you need to get it tuned out if you do mess with them ..

Xtasy2010 .. did you add a base load to what you see ?

The formula for load calculation is Desired engine load + engine load offset ..

Your boost limit should be about 280 tapering to 240 at high rpms .. so you'll never reach it unless you decide to run higher boost. .

 

Indeed messing with the pills is part of the fun, but like Gunzo said you need to adjust boost limit tables if you are flagging overboost codes by logging what you typically hit for load and then adding a 10-20% cushion. Mainly the limits are in place to prevent engine damage in case the signal fails to reach your WG and boost goes uncontrolled somehow. You can also increase the trigger time from 1000ms (1 sec) to something higher so that short boost spikes don't trigger the overboost either. Usually brief spikes aren't a major concern but most try to limit them to 1-2 psi spikes if possible.

As for the pill restricting flow right from the boost source, like others have said making this smaller (more restrictive) would raise boost, making it bigger (less restrictive) or non existant would lower boost since more boost signal will reach your WG. Likewise making the bleedhole(s) on a MBC or ECU controlled setup larger or less restrictive will reduce the signal to the WG and raise boost.

Here are my findings:

Lower Boost <-------------------------------------------> Higher Boost
Stronger signal <------------------------------------------> Weaker signal
Less boost spike <-----------------------------------------> More boost spike
No pill/large opening restricter pill <---------------------> small opening restricter pill (pre boost controller)
Smaller bleed hole(s) <----------------------------------> Larger bleed hole(s) (post boost controller)
Lower minimum boost <-------------------------------> Higher minimum boost
Low WGA preload <---------------------------------> High WGA preload

Some of these combinations can cancel each other out. Previously when I used an internal wastegate I had these things potentially increase spike:

High WGA preload = +7 turns
Higher minimum boost = 25 psi (using the MBC to move up from there)

This would normally give a higher boost spike but I'm also doing these things to counter that:

Stronger Signal/No restricter pill = full vacuum line from boost source to MBC to WGA. Boost rockets up to set point with very little overshoot.

Smaller bleed hole = only needs to be small since my MBC isn't raising it much above what the WGA is set for.

For ECU controlled boost you may have to adjust the target loads that the ECU is trying to reach in the tables, although past 5500 RPM's the flow limits of the stock turbo will limit the boost levels you can achieve.

On my latest setup I've found that the boost response is still quite balanced using the ATP O2 DP with Tial WG. Basically I don't have to preload an internal WG anymore but the boost still only spikes 1-2 psi and then settles at setpoint all the way to redline and eventually past 7400 it starts to taper down from flow limits on my GT30 turbo.