Hey guys, hope everyone is kicking some *** in their Evos. I need some
guidance. Maybe you can help me. I have some questions regarding tuning my AEM Tru Boost EBC

AMS tuned my 06 Evo IX MR, and they have my "SPR" set at 2.0
What do you think, and why is this set low?

When it was cold outside I was normally making a peak High boost of about 23.5 psi. Sometimes at night when it was real chilly I was even hitting a high boost of around 25.3 - 25.7 psi in 3rd-4th gear.

Lately, now that it has been hot as hell outside, i have been having a high boost of just around stock psi. Typically around 19.2 to 19.7 psi...

Today i was trying to see if I could fix this High boost issue.
FYI: The temperature outside where I live is about 84 degrees F today.

So I turned her on. After she was warm I went into my "A" boost setting and put my duty cycle from 62(AMS had it set at 62) all the way up to 68. I adjusted it 2 numbers at a time and did pulls each time in 3rd. (Then saved the setting.)

At "A68" I am now peak boosting 22.7 psi in a 3rd gear pull with it being 84 degrees outside. Alot better than my previous 19.5...but 22.7 still seems a bit low for an A68 setting. I HAVE NOT adjusted the "SPR" on it. It's still set at "2.0" What do you guys think?

The spool up seems to be fine, but i'm not entirely sure. I don't have a graph to look at, just my eyes looking at the gauge as I boost through the gear from 3,500RPM to 7,000RPM. It seems to be holding around 19 psi. Is that about right?
Of course before you give me any advice... you will need to know my mods.

Mods:

AMS Intercooler w/ lower ICP
Megan Exhaust Manifold
Nvidia 02 Housing
Walbro 255
AEM Intake
GFB BOV
AEM Tru Boost
AEM UEGO Wideband
Helix DP
Perrin Cat-Delete
Greddy Full Titanium Cat Back
(Michelin Pilot Sport 255/40 ZR 17 Tires on my stock BBS)

Okay, ANY advice or knowledge would be highly appreciated about what my spring rate should be, as well as what my duty cycle % can be/or should be at before entering a dangerous boost spike.

FYI: I am near certain I have no boost leaks as AMS tested and fixed any boost leaks I had about 6 months ago. When they tuned my Evo i had about 17,500 miles on it. I now have about 21,500 miles.

More FYI: My car was AMS Tuned at 351.6 awhp & 352.8 ft.lbs TQ with the mods listed above.

Hope to hear from some knowledgeable Evo owners with this AEM Tru Boost.

-Nick Mionie
06 Rally Red Evo IX MR
from South Jersey

 

oh $hit... I put this in the wrong thread. This is an Evo X forum.

 

The spr setting can be raised up if you would like. I usually set it to at least 12 or 13 on EVO's, but it does not seem to have an effect either way.

The duty cycle will need to modfied slightly up and down to compensate for the air density change between summer and winter air temperatures. This is a regular occurrence and there is no set duty cycle that you should go over or under for the best results. Just keep an eye on the boost level like you have been doing and adjust in small increments until you get to your desired boost level.

-Chris

 

CHRIS!
Advice from a real pro - EXACTLY what I wanted.

Why do you think they have my SPR set at 2? Perhaps he might have forgot to adjust that to the suggested setting of 12 or 13?

And you are suggesting me try to set it at 12, right? What does the increase of the SPR adjustment do? Allow to maintain higher boost longer throughout the gear be4 it falls? What will I gain with the SPR set at 12. I understand you said that their seems to be no affect with the adjustment, but I'm sure it must do something.

This is my first turbo car, and I am learning as I go. I appreciate the advice about having to keep adjusting it given the weather condition. I was concerned that maybe something was wrong when I was boosting around 19psi all ***n summer long, until today, when I grew enough ***** to try to adjust it. lol

ok, will be awaiting your next reply!

 

bump...

 

The spr setting is for the spring pressure in the wastegate, if there was no boost controller attached to the car, and a straight pressure line to the wastegate, this is the boost that the car would run. Typically between 10-12 lbs on an evo 8 and 9 from my experience.

What it will do is keep the solenoid 'closed' or will not have any pressure signal going to the wastegate until that boost target set point is reached. Theoretically, this should increase your spool up time because your wastegate will be fully closed and all of your exhaust energy will have to go through the turbo and it will spool up faster.

On cars with wastegates that are very touchy, or don't have much spring pressure holding them closed, this could be very useful, however on the EVO, I have not see this parameter be necessary adjustment to get the full spool our of the car, because the wastegate is adequately tight from the factory.

 

Awesome advice and information. I will try setting the SPR at 10, and hopefully all is well. If you have anything more to add, then please feel free to say. I will keep an eye out for your response if you have another. Thanks so much for your creditable information. I trust 100% of what you guys over at AMS say to do. Cant wait for my next upgrade, and of course I'll be having you guys over at AMS to take care of it.