I tweaked it a bit. Spools a bit faster. Second gear benefited the most. I need to log it though to see what's doing now.

 

i have a 7.5psi spring in my wastegate. i guess i'll swap the springs and play with boost control

can someone give me the cliff notes rundown on adjusting boost on aem series 1? I can send my map if anyone needs to look at it

 

Share share share.


Sent from my iPhone 5 using Tapatalk.

 

you switched to aem v2. i have no idea how they do it. in aem v1, i use the boost table and the boost control via vss. i need to give screen shot of it. lemme see if i can right now

 

With the aem you can use the boost feedback table to speed up or slow down the spool. It has the most effect when you're already at high rpm and get into the throttle.

This pic shows what i do for the error control to manipulate the spool.

The top graph shows how to make it spool the fastest
the middle shows how to make it a little lazier
the 3rd shows what I normally start with. This makes the initial spool up quick but doesnt overshoot and doest oscillate

The sharp cut for an overboost condition tends to lead to harsh oscillations, that usually results in a pretty wavy dyno graph.

 

this is from the v1 software, the v2 has the same setup.

 

Thanks for posting the screenshots. I don't understand the term, boost error, and boost error % duty cycle?

Can you give an example?

WTH is PSIg? I figured it was psi, and 1.24 is ~ 18lbs in the bar scale, so why is it called that? Unless I'm waaay off.

 

its showing psi as in boost. like 0 is the target in the middle. so you want 10 psi thats the 0 on teh graph. and -5 is 5 psi below target boost. as you get closer to the target you step down the amouint of help to get to target. then past target is reverses what its doing. i went super conservative lol. gonna tweak it some more.

 

Best explanation of boost duty cycle found here... http://blog.perrinperformance.com/bo...lained-part-2/ Also go through page 1,2 and 3.


This is how I setup my boost on the AEM EMS 2. There are more than one way to setup boost control, but I like this method better. It is more intuitive. I don't have AEM 1, so I don't know if it has a boost table.

The boost table is setup to have 100% duty cycle.


At 100% duty cycle, the External wastegate is close 100% which equals 100% exhaust gas flowing through the turbo exhaust turbine. This allows for max boost independent of wastegate spring pressure.

[youtube]http://www.youtube.com/watch?v=eKB06H2B5UY[/youtube]

Here's my youtube video on modifying the boost table..go to the 1:00 mark. As boost rises through the table to 17psi, the duty cycle decreases to ~40%. At 18psi, it is 0% duty cycle, allowing for maxing flow of exhaust gas through the wastegate. You can see the fluctuation of boost around 17psi. To control this fluctuation, you can use Wadzii's post to minimize the oscillations.

The amount of boost duty cycle to use to minimize oscillation is trail and error. The beauty of AEM is that I can adjust the settings on the fly. So I have a driver drive while I adjust the duty cycles until I get minimal oscillation at the target boost level.

And to answer your initial question Camuman, to create a boost spike, you would increase the duty cycle at around 4000rpm to 5500 rpm and up to whatever boost psi you want to spike.

This method is compatible with boost by gear...

 

Absolutely. Unless you're dead set on running really low boost to get out of the hole or keep traction in low gears at WOT, I would run a spring size equal to your normal pump gas tune. I run 15psi on pump gas and recently changed from a 7psi to a 14.5 psi spring. Boost comes in somewhat faster and a lot harder. Hell, I turned my boost controller off because I don't need it on the street now.